/* Buffer management for tar.
- Copyright (C) 1988, 1992 Free Software Foundation
-
-This file is part of GNU Tar.
-
-GNU Tar is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Tar is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Tar; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-/*
- * Buffer management for tar.
- *
- * Written by John Gilmore, ihnp4!hoptoad!gnu, on 25 August 1985.
- */
-
-#include <stdio.h>
-#include <errno.h>
-#ifndef STDC_HEADERS
-extern int errno;
-#endif
-#include <sys/types.h> /* For non-Berkeley systems */
+
+ Copyright 1988, 1992-1994, 1996-1997, 1999-2010, 2013-2014 Free
+ Software Foundation, Inc.
+
+ This file is part of GNU tar.
+
+ GNU tar is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ GNU tar is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ Written by John Gilmore, on 1985-08-25. */
+
+#include <system.h>
+#include <system-ioctl.h>
+
#include <signal.h>
-#include <time.h>
-time_t time();
-#ifdef HAVE_SYS_MTIO_H
-#include <sys/ioctl.h>
-#include <sys/mtio.h>
-#endif
+#include <closeout.h>
+#include <fnmatch.h>
+#include <human.h>
+#include <quotearg.h>
-#ifdef BSD42
-#include <sys/file.h>
-#else
-#ifndef V7
-#include <fcntl.h>
-#endif
-#endif
+#include "common.h"
+#include <rmt.h>
-#ifdef __MSDOS__
-#include <process.h>
-#endif
+/* Number of retries before giving up on read. */
+#define READ_ERROR_MAX 10
-#ifdef XENIX
-#include <sys/inode.h>
-#endif
+/* Variables. */
-#include "tar.h"
-#include "port.h"
-#include "rmt.h"
-#include "regex.h"
+static tarlong prev_written; /* bytes written on previous volumes */
+static tarlong bytes_written; /* bytes written on this volume */
+static void *record_buffer[2]; /* allocated memory */
+static union block *record_buffer_aligned[2];
+static int record_index;
-/* Either stdout or stderr: The thing we write messages (standard msgs, not
- errors) to. Stdout unless we're writing a pipe, in which case stderr */
-FILE *msg_file = stdout;
+/* FIXME: The following variables should ideally be static to this
+ module. However, this cannot be done yet. The cleanup continues! */
-#define STDIN 0 /* Standard input file descriptor */
-#define STDOUT 1 /* Standard output file descriptor */
+union block *record_start; /* start of record of archive */
+union block *record_end; /* last+1 block of archive record */
+union block *current_block; /* current block of archive */
+enum access_mode access_mode; /* how do we handle the archive */
+off_t records_read; /* number of records read from this archive */
+off_t records_written; /* likewise, for records written */
+extern off_t records_skipped; /* number of records skipped at the start
+ of the archive, defined in delete.c */
-#define PREAD 0 /* Read file descriptor from pipe() */
-#define PWRITE 1 /* Write file descriptor from pipe() */
+static off_t record_start_block; /* block ordinal at record_start */
-#define MAGIC_STAT 105 /* Magic status returned by child, if
- it can't exec. We hope compress/sh
- never return this status! */
+/* Where we write list messages (not errors, not interactions) to. */
+FILE *stdlis;
-char *valloc();
+static void backspace_output (void);
-void writeerror();
-void readerror();
+/* PID of child program, if compress_option or remote archive access. */
+static pid_t child_pid;
-void ck_pipe();
-void ck_close();
+/* Error recovery stuff */
+static int read_error_count;
-int backspace_output();
-extern void finish_header();
-void flush_archive();
-int isfile();
-int new_volume();
-void verify_volume();
-extern void to_oct();
+/* Have we hit EOF yet? */
+static bool hit_eof;
-#ifndef __MSDOS__
-/* Obnoxious test to see if dimwit is trying to dump the archive */
-dev_t ar_dev;
-ino_t ar_ino;
-#endif
+static bool read_full_records = false;
-/*
- * The record pointed to by save_rec should not be overlaid
- * when reading in a new tape block. Copy it to record_save_area first, and
- * change the pointer in *save_rec to point to record_save_area.
- * Saved_recno records the record number at the time of the save.
- * This is used by annofile() to print the record number of a file's
- * header record.
- */
-static union record **save_rec;
- union record record_save_area;
-static long saved_recno;
-
-/*
- * PID of child program, if f_compress or remote archive access.
- */
-static int childpid = 0;
-
-/*
- * Record number of the start of this block of records
- */
-long baserec;
-
-/*
- * Error recovery stuff
- */
-static int r_error_count;
-
-/*
- * Have we hit EOF yet?
- */
-static int hit_eof;
-
-/* Checkpointing counter */
-static int checkpoint;
-
-/* JF we're reading, but we just read the last record and its time to update */
-extern time_to_start_writing;
-int file_to_switch_to= -1; /* If remote update, close archive, and use
- this descriptor to write to */
-
-static int volno = 1; /* JF which volume of a multi-volume tape
- we're on */
-static int global_volno = 1; /* Volume number to print in external messages. */
-
-char *save_name = 0; /* Name of the file we are currently writing */
-long save_totsize; /* total size of file we are writing. Only
- valid if save_name is non_zero */
-long save_sizeleft; /* Where we are in the file we are writing.
- Only valid if save_name is non-zero */
-
-int write_archive_to_stdout;
-
-/* Used by fl_read and fl_write to store the real info about saved names */
-static char real_s_name[NAMSIZ];
-static long real_s_totsize;
-static long real_s_sizeleft;
-
-/* Reset the EOF flag (if set), and re-set ar_record, etc */
+/* We're reading, but we just read the last block and it's time to update.
+ Declared in update.c
+
+ FIXME: Either eliminate it or move it to common.h.
+*/
+extern bool time_to_start_writing;
+
+bool write_archive_to_stdout;
+
+static void (*flush_write_ptr) (size_t);
+static void (*flush_read_ptr) (void);
+
+\f
+char *volume_label;
+char *continued_file_name;
+uintmax_t continued_file_size;
+uintmax_t continued_file_offset;
+
+\f
+static int volno = 1; /* which volume of a multi-volume tape we're
+ on */
+static int global_volno = 1; /* volume number to print in external
+ messages */
+
+bool write_archive_to_stdout;
+
+\f
+/* Multi-volume tracking support */
+
+/* When creating a multi-volume archive, each 'bufmap' represents
+ a member stored (perhaps partly) in the current record buffer.
+ After flushing the record to the output media, all bufmaps that
+ represent fully written members are removed from the list, then
+ the sizeleft and start numbers in the remaining bufmaps are updated.
+
+ When reading from a multi-volume archive, the list degrades to a
+ single element, which keeps information about the member currently
+ being read.
+*/
+
+struct bufmap
+{
+ struct bufmap *next; /* Pointer to the next map entry */
+ size_t start; /* Offset of the first data block */
+ char *file_name; /* Name of the stored file */
+ off_t sizetotal; /* Size of the stored file */
+ off_t sizeleft; /* Size left to read/write */
+};
+static struct bufmap *bufmap_head, *bufmap_tail;
+
+/* This variable, when set, inhibits updating the bufmap chain after
+ a write. This is necessary when writing extended POSIX headers. */
+static int inhibit_map;
void
-reset_eof()
+mv_begin_write (const char *file_name, off_t totsize, off_t sizeleft)
{
- if(hit_eof) {
- hit_eof=0;
- ar_record=ar_block;
- ar_last=ar_block+blocking;
- ar_reading=0;
- }
+ if (multi_volume_option)
+ {
+ struct bufmap *bp = xmalloc (sizeof bp[0]);
+ if (bufmap_tail)
+ bufmap_tail->next = bp;
+ else
+ bufmap_head = bp;
+ bufmap_tail = bp;
+
+ bp->next = NULL;
+ bp->start = current_block - record_start;
+ bp->file_name = xstrdup (file_name);
+ bp->sizetotal = totsize;
+ bp->sizeleft = sizeleft;
+ }
}
-/*
- * Return the location of the next available input or output record.
- * Return NULL for EOF. Once we have returned NULL, we just keep returning
- * it, to avoid accidentally going on to the next file on the "tape".
- */
-union record *
-findrec()
-{
- if (ar_record == ar_last) {
- if (hit_eof)
- return (union record *)NULL; /* EOF */
- flush_archive();
- if (ar_record == ar_last) {
- hit_eof++;
- return (union record *)NULL; /* EOF */
- }
- }
- return ar_record;
+static struct bufmap *
+bufmap_locate (size_t off)
+{
+ struct bufmap *map;
+
+ for (map = bufmap_head; map; map = map->next)
+ {
+ if (!map->next
+ || off < map->next->start * BLOCKSIZE)
+ break;
+ }
+ return map;
}
+static void
+bufmap_free (struct bufmap *mark)
+{
+ struct bufmap *map;
+ for (map = bufmap_head; map && map != mark; )
+ {
+ struct bufmap *next = map->next;
+ free (map->file_name);
+ free (map);
+ map = next;
+ }
+ bufmap_head = map;
+ if (!bufmap_head)
+ bufmap_tail = bufmap_head;
+}
-/*
- * Indicate that we have used all records up thru the argument.
- * (should the arg have an off-by-1? XXX FIXME)
- */
-void
-userec(rec)
- union record *rec;
+static void
+bufmap_reset (struct bufmap *map, ssize_t fixup)
{
- while(rec >= ar_record)
- ar_record++;
- /*
- * Do NOT flush the archive here. If we do, the same
- * argument to userec() could mean the next record (if the
- * input block is exactly one record long), which is not what
- * is intended.
- */
- if (ar_record > ar_last)
- abort();
+ bufmap_free (map);
+ if (map)
+ {
+ for (; map; map = map->next)
+ map->start += fixup;
+ }
}
+\f
+static struct tar_stat_info dummy;
-/*
- * Return a pointer to the end of the current records buffer.
- * All the space between findrec() and endofrecs() is available
- * for filling with data, or taking data from.
- */
-union record *
-endofrecs()
+void
+buffer_write_global_xheader (void)
{
- return ar_last;
+ xheader_write_global (&dummy.xhdr);
}
+void
+mv_begin_read (struct tar_stat_info *st)
+{
+ mv_begin_write (st->orig_file_name, st->stat.st_size, st->stat.st_size);
+}
-/*
- * Duplicate a file descriptor into a certain slot.
- * Equivalent to BSD "dup2" with error reporting.
- */
void
-dupto(from, to, msg)
- int from, to;
- char *msg;
-{
- int err;
-
- if (from != to) {
- err=close(to);
- if(err<0 && errno!=EBADF) {
- msg_perror("Cannot close descriptor %d",to);
- exit(EX_SYSTEM);
- }
- err = dup(from);
- if (err != to) {
- msg_perror("cannot dup %s",msg);
- exit(EX_SYSTEM);
- }
- ck_close(from);
- }
+mv_end (void)
+{
+ if (multi_volume_option)
+ bufmap_free (NULL);
}
-#ifdef __MSDOS__
void
-child_open()
+mv_size_left (off_t size)
{
- fprintf(stderr,"MS-DOS %s can't use compressed or remote archives\n",tar);
- exit(EX_ARGSBAD);
+ if (bufmap_head)
+ bufmap_head->sizeleft = size;
}
-#else
+
+\f
+/* Functions. */
+
void
-child_open()
+clear_read_error_count (void)
{
- int pipe[2];
- int err = 0;
- int nar;
+ read_error_count = 0;
+}
- int kidpipe[2];
- int kidchildpid;
+\f
+/* Time-related functions */
-#define READ 0
-#define WRITE 1
+static double duration;
- ck_pipe(pipe);
+void
+set_start_time (void)
+{
+ gettime (&start_time);
+ volume_start_time = start_time;
+ last_stat_time = start_time;
+}
- childpid=fork();
- if(childpid<0) {
- msg_perror("cannot fork");
- exit(EX_SYSTEM);
- }
- if(childpid>0) {
- /* We're the parent. Clean up and be happy */
- /* This, at least, is easy */
-
- if(ar_reading) {
- f_reblock++;
- archive=pipe[READ];
- ck_close(pipe[WRITE]);
- } else {
- archive = pipe[WRITE];
- ck_close(pipe[READ]);
- }
- return;
- }
+static void
+set_volume_start_time (void)
+{
+ gettime (&volume_start_time);
+ last_stat_time = volume_start_time;
+}
- /* We're the kid */
- if(ar_reading) {
- dupto(pipe[WRITE],STDOUT,"(child) pipe to stdout");
- ck_close(pipe[READ]);
- } else {
- dupto(pipe[READ],STDIN,"(child) pipe to stdin");
- ck_close(pipe[WRITE]);
- }
+double
+compute_duration (void)
+{
+ struct timespec now;
+ gettime (&now);
+ duration += ((now.tv_sec - last_stat_time.tv_sec)
+ + (now.tv_nsec - last_stat_time.tv_nsec) / 1e9);
+ gettime (&last_stat_time);
+ return duration;
+}
- /* We need a child tar only if
- 1: we're reading/writing stdin/out (to force reblocking)
- 2: the file is to be accessed by rmt (compress doesn't know how)
- 3: the file is not a plain file */
-#ifdef NO_REMOTE
- if(!(ar_files[0][0]=='-' && ar_files[0][1]=='\0') && isfile(ar_files[0]))
-#else
- if(!(ar_files[0][0]=='-' && ar_file[0][1]=='\0') && !_remdev(ar_files[0]) && isfile(ar_files[0]))
-#endif
+\f
+/* Compression detection */
+
+enum compress_type {
+ ct_none, /* Unknown compression type */
+ ct_tar, /* Plain tar file */
+ ct_compress,
+ ct_gzip,
+ ct_bzip2,
+ ct_lzip,
+ ct_lzma,
+ ct_lzop,
+ ct_xz
+};
+
+static enum compress_type archive_compression_type = ct_none;
+
+struct zip_magic
+{
+ enum compress_type type;
+ size_t length;
+ char const *magic;
+};
+
+struct zip_program
+{
+ enum compress_type type;
+ char const *program;
+ char const *option;
+};
+
+static struct zip_magic const magic[] = {
+ { ct_none, 0, 0 },
+ { ct_tar, 0, 0 },
+ { ct_compress, 2, "\037\235" },
+ { ct_gzip, 2, "\037\213" },
+ { ct_bzip2, 3, "BZh" },
+ { ct_lzip, 4, "LZIP" },
+ { ct_lzma, 6, "\xFFLZMA" },
+ { ct_lzop, 4, "\211LZO" },
+ { ct_xz, 6, "\xFD" "7zXZ" },
+};
+
+#define NMAGIC (sizeof(magic)/sizeof(magic[0]))
+
+static struct zip_program zip_program[] = {
+ { ct_compress, COMPRESS_PROGRAM, "-Z" },
+ { ct_compress, GZIP_PROGRAM, "-z" },
+ { ct_gzip, GZIP_PROGRAM, "-z" },
+ { ct_bzip2, BZIP2_PROGRAM, "-j" },
+ { ct_bzip2, "lbzip2", "-j" },
+ { ct_lzip, LZIP_PROGRAM, "--lzip" },
+ { ct_lzma, LZMA_PROGRAM, "--lzma" },
+ { ct_lzma, XZ_PROGRAM, "-J" },
+ { ct_lzop, LZOP_PROGRAM, "--lzop" },
+ { ct_xz, XZ_PROGRAM, "-J" },
+ { ct_none }
+};
+
+static struct zip_program const *
+find_zip_program (enum compress_type type, int *pstate)
+{
+ int i;
+
+ for (i = *pstate; zip_program[i].type != ct_none; i++)
+ {
+ if (zip_program[i].type == type)
{
- /* We don't need a child tar. Open the archive */
- if(ar_reading) {
- archive=open(ar_files[0], O_RDONLY|O_BINARY, 0666);
- if(archive<0) {
- msg_perror("can't open archive %s",ar_files[0]);
- exit(EX_BADARCH);
- }
- dupto(archive,STDIN,"archive to stdin");
- /* close(archive); */
- } else {
- archive=creat(ar_files[0],0666);
- if(archive<0) {
- msg_perror("can't open archive %s",ar_files[0]);
- exit(EX_BADARCH);
- }
- dupto(archive,STDOUT,"archive to stdout");
- /* close(archive); */
- }
- } else {
- /* We need a child tar */
- ck_pipe(kidpipe);
-
- kidchildpid=fork();
- if(kidchildpid<0) {
- msg_perror("child can't fork");
- exit(EX_SYSTEM);
- }
-
- if(kidchildpid>0) {
- /* About to exec compress: set up the files */
- if(ar_reading) {
- dupto(kidpipe[READ],STDIN,"((child)) pipe to stdin");
- ck_close(kidpipe[WRITE]);
- /* dup2(pipe[WRITE],STDOUT); */
- } else {
- /* dup2(pipe[READ],STDIN); */
- dupto(kidpipe[WRITE],STDOUT,"((child)) pipe to stdout");
- ck_close(kidpipe[READ]);
- }
- /* ck_close(pipe[READ]); */
- /* ck_close(pipe[WRITE]); */
- /* ck_close(kidpipe[READ]);
- ck_close(kidpipe[WRITE]); */
- } else {
- /* Grandchild. Do the right thing, namely sit here and
- read/write the archive, and feed stuff back to compress */
- tar="tar (child)";
- if(ar_reading) {
- dupto(kidpipe[WRITE],STDOUT,"[child] pipe to stdout");
- ck_close(kidpipe[READ]);
- } else {
- dupto(kidpipe[READ],STDIN,"[child] pipe to stdin");
- ck_close(kidpipe[WRITE]);
- }
-
- if (ar_file[0] == '-' && ar_file[1] == '\0') {
- if (ar_reading)
- archive = STDIN;
- else
- archive = STDOUT;
- } else /* This can't happen if (ar_reading==2)
- archive = rmtopen(ar_files[0], O_RDWR|O_CREAT|O_BINARY, 0666);
- else */if(ar_reading)
- archive = rmtopen(ar_files[0], O_RDONLY|O_BINARY, 0666);
- else
- archive = rmtcreat(ar_files[0], 0666);
-
- if (archive < 0) {
- msg_perror("can't open archive %s",ar_files[0]);
- exit(EX_BADARCH);
- }
-
- if(ar_reading) {
- for(;;) {
- char *ptr;
- int max,count;
-
- r_error_count = 0;
- error_loop:
- err=rmtread(archive, ar_block->charptr,(int)(blocksize));
- if(err<0) {
- readerror();
- goto error_loop;
- }
- if(err==0)
- break;
- ptr = ar_block->charptr;
- max = err;
- while(max) {
- count = (max<RECORDSIZE) ? max : RECORDSIZE;
- err=write(STDOUT,ptr,count);
- if(err!=count) {
- if(err<0) {
- msg_perror("can't write to compress");
- exit(EX_SYSTEM);
- } else
- msg("write to compress short %d bytes",count-err);
- count = (err<0) ? 0 : err;
- }
- ptr+=count;
- max-=count;
- }
- }
- } else {
- for(;;) {
- int n;
- char *ptr;
-
- n=blocksize;
- ptr = ar_block->charptr;
- while(n) {
- err=read(STDIN,ptr,(n<RECORDSIZE) ? n : RECORDSIZE);
- if(err<=0)
- break;
- n-=err;
- ptr+=err;
- }
- /* EOF */
- if(err==0) {
- if(f_compress<2)
- blocksize-=n;
- else
- bzero(ar_block->charptr+blocksize-n,n);
- err=rmtwrite(archive,ar_block->charptr,blocksize);
- if(err!=(blocksize))
- writeerror(err);
- if(f_compress<2)
- blocksize+=n;
- break;
- }
- if(n) {
- msg_perror("can't read from compress");
- exit(EX_SYSTEM);
- }
- err=rmtwrite(archive, ar_block->charptr, (int)blocksize);
- if(err!=blocksize)
- writeerror(err);
- }
- }
-
- /* close_archive(); */
- exit(0);
- }
+ *pstate = i + 1;
+ return zip_program + i;
}
- /* So we should exec compress (-d) */
- if(ar_reading)
- execlp("compress", "compress", "-d", (char *)0);
- else
- execlp("compress", "compress", (char *)0);
- msg_perror("can't exec compress");
- _exit(EX_SYSTEM);
+ }
+ *pstate = i;
+ return NULL;
}
+const char *
+first_decompress_program (int *pstate)
+{
+ struct zip_program const *zp;
-/* return non-zero if p is the name of a directory */
-int
-isfile(p)
-char *p;
+ if (use_compress_program_option)
+ return use_compress_program_option;
+
+ if (archive_compression_type == ct_none)
+ return NULL;
+
+ *pstate = 0;
+ zp = find_zip_program (archive_compression_type, pstate);
+ return zp ? zp->program : NULL;
+}
+
+const char *
+next_decompress_program (int *pstate)
{
- struct stat stbuf;
+ struct zip_program const *zp;
- if(stat(p,&stbuf)<0)
- return 1;
- if(S_ISREG(stbuf.st_mode))
- return 1;
- return 0;
+ if (use_compress_program_option)
+ return NULL;
+ zp = find_zip_program (archive_compression_type, pstate);
+ return zp ? zp->program : NULL;
}
-#endif
+static const char *
+compress_option (enum compress_type type)
+{
+ struct zip_program const *zp;
+ int i = 0;
+ zp = find_zip_program (type, &i);
+ return zp ? zp->option : NULL;
+}
-/*
- * Open an archive file. The argument specifies whether we are
- * reading or writing.
- */
-/* JF if the arg is 2, open for reading and writing. */
-void
-open_archive(reading)
- int reading;
+/* Check if the file ARCHIVE is a compressed archive. */
+static enum compress_type
+check_compressed_archive (bool *pshort)
{
- msg_file = f_exstdout ? stderr : stdout;
+ struct zip_magic const *p;
+ bool sfr;
+ bool temp;
- if (blocksize == 0) {
- msg("invalid value for blocksize");
- exit(EX_ARGSBAD);
- }
+ if (!pshort)
+ pshort = &temp;
- if(n_ar_files==0) {
- msg("No archive name given, what should I do?");
- exit(EX_BADARCH);
- }
+ /* Prepare global data needed for find_next_block: */
+ record_end = record_start; /* set up for 1st record = # 0 */
+ sfr = read_full_records;
+ read_full_records = true; /* Suppress fatal error on reading a partial
+ record */
+ *pshort = find_next_block () == 0;
- /*NOSTRICT*/
- if(f_multivol) {
- ar_block = (union record *) valloc((unsigned)(blocksize+(2*RECORDSIZE)));
- if(ar_block)
- ar_block += 2;
- } else
- ar_block = (union record *) valloc((unsigned)blocksize);
- if (!ar_block) {
- msg("could not allocate memory for blocking factor %d",
- blocking);
- exit(EX_ARGSBAD);
- }
+ /* Restore global values */
+ read_full_records = sfr;
- ar_record = ar_block;
- ar_last = ar_block + blocking;
- ar_reading = reading;
-
- if (f_compress) {
- if(reading==2 || f_verify) {
- msg("cannot update or verify compressed archives");
- exit(EX_ARGSBAD);
- }
- if (f_multivol) {
- msg ("cannot use multi-volume compressed archives");
- exit (EX_ARGSBAD);
- }
- child_open();
- if(!reading && ar_files[0][0]=='-' && ar_files[0][1]=='\0')
- msg_file = stderr;
- /* child_open(rem_host, rem_file); */
- } else if (ar_files[0][0] == '-' && ar_files[0][1] == '\0') {
- f_reblock++; /* Could be a pipe, be safe */
- if(f_verify) {
- msg("can't verify stdin/stdout archive");
- exit(EX_ARGSBAD);
- }
- if(reading==2) {
- archive=STDIN;
- msg_file=stderr;
- write_archive_to_stdout++;
- } else if (reading)
- archive = STDIN;
- else {
- archive = STDOUT;
- msg_file = stderr;
- }
- } else if (reading==2 || f_verify) {
- archive = rmtopen(ar_files[0], O_RDWR|O_CREAT|O_BINARY, 0666);
- } else if(reading) {
- archive = rmtopen(ar_files[0], O_RDONLY|O_BINARY, 0666);
- } else {
- archive = rmtcreat(ar_files[0], 0666);
- }
- if (archive < 0) {
- msg_perror("can't open %s",ar_files[0]);
- exit(EX_BADARCH);
- }
-#ifndef __MSDOS__
- if(!_isrmt(archive)) {
- struct stat tmp_stat;
-
- fstat(archive,&tmp_stat);
- if(S_ISREG(tmp_stat.st_mode)) {
- ar_dev=tmp_stat.st_dev;
- ar_ino=tmp_stat.st_ino;
- }
- }
-#endif
+ if (tar_checksum (record_start, true) == HEADER_SUCCESS)
+ /* Probably a valid header */
+ return ct_tar;
-#ifdef __MSDOS__
- setmode(archive, O_BINARY);
-#endif
+ for (p = magic + 2; p < magic + NMAGIC; p++)
+ if (memcmp (record_start->buffer, p->magic, p->length) == 0)
+ return p->type;
- if (reading) {
- ar_last = ar_block; /* Set up for 1st block = # 0 */
- (void) findrec(); /* Read it in, check for EOF */
+ return ct_none;
+}
- if(f_volhdr) {
- union record *head;
-#if 0
- char *ptr;
+/* Guess if the archive is seekable. */
+static void
+guess_seekable_archive (void)
+{
+ struct stat st;
- if(f_multivol) {
- ptr=malloc(strlen(f_volhdr)+20);
- sprintf(ptr,"%s Volume %d",f_volhdr,1);
- } else
- ptr=f_volhdr;
-#endif
- head=findrec();
- if(!head) {
- msg("Archive not labelled to match %s",f_volhdr);
- exit(EX_BADVOL);
- }
- if (re_match (label_pattern, head->header.name,
- strlen (head->header.name), 0, 0) < 0) {
- msg ("Volume mismatch! %s!=%s", f_volhdr,
- head->header.name);
- exit (EX_BADVOL);
- }
-#if 0
- if(strcmp(ptr,head->header.name)) {
- msg("Volume mismatch! %s!=%s",ptr,head->header.name);
- exit(EX_BADVOL);
- }
- if(ptr!=f_volhdr)
- free(ptr);
-#endif
- }
- } else if(f_volhdr) {
- bzero((void *)ar_block,RECORDSIZE);
- if(f_multivol)
- sprintf(ar_block->header.name,"%s Volume 1",f_volhdr);
- else
- strcpy(ar_block->header.name,f_volhdr);
- ar_block->header.linkflag = LF_VOLHDR;
- to_oct(time(0), 1+12, ar_block->header.mtime);
- finish_header(ar_block);
- /* ar_record++; */
- }
+ if (subcommand_option == DELETE_SUBCOMMAND)
+ {
+ /* The current code in delete.c is based on the assumption that
+ skip_member() reads all data from the archive. So, we should
+ make sure it won't use seeks. On the other hand, the same code
+ depends on the ability to backspace a record in the archive,
+ so setting seekable_archive to false is technically incorrect.
+ However, it is tested only in skip_member(), so it's not a
+ problem. */
+ seekable_archive = false;
+ }
+
+ if (seek_option != -1)
+ {
+ seekable_archive = !!seek_option;
+ return;
+ }
+
+ if (!multi_volume_option && !use_compress_program_option
+ && fstat (archive, &st) == 0)
+ seekable_archive = S_ISREG (st.st_mode);
+ else
+ seekable_archive = false;
}
+/* Open an archive named archive_name_array[0]. Detect if it is
+ a compressed archive of known type and use corresponding decompression
+ program if so */
+static int
+open_compressed_archive (void)
+{
+ archive = rmtopen (archive_name_array[0], O_RDONLY | O_BINARY,
+ MODE_RW, rsh_command_option);
+ if (archive == -1)
+ return archive;
+
+ if (!multi_volume_option)
+ {
+ if (!use_compress_program_option)
+ {
+ bool shortfile;
+ enum compress_type type = check_compressed_archive (&shortfile);
+
+ switch (type)
+ {
+ case ct_tar:
+ if (shortfile)
+ ERROR ((0, 0, _("This does not look like a tar archive")));
+ return archive;
+
+ case ct_none:
+ if (shortfile)
+ ERROR ((0, 0, _("This does not look like a tar archive")));
+ set_compression_program_by_suffix (archive_name_array[0], NULL);
+ if (!use_compress_program_option)
+ return archive;
+ break;
+
+ default:
+ archive_compression_type = type;
+ break;
+ }
+ }
+
+ /* FD is not needed any more */
+ rmtclose (archive);
+
+ hit_eof = false; /* It might have been set by find_next_block in
+ check_compressed_archive */
+
+ /* Open compressed archive */
+ child_pid = sys_child_open_for_uncompress ();
+ read_full_records = true;
+ }
+
+ records_read = 0;
+ record_end = record_start; /* set up for 1st record = # 0 */
+
+ return archive;
+}
+\f
+static int
+print_stats (FILE *fp, const char *text, tarlong numbytes)
+{
+ char abbr[LONGEST_HUMAN_READABLE + 1];
+ char rate[LONGEST_HUMAN_READABLE + 1];
+ int n = 0;
+
+ int human_opts = human_autoscale | human_base_1024 | human_SI | human_B;
+
+ if (text && text[0])
+ n += fprintf (fp, "%s: ", gettext (text));
+ return n + fprintf (fp, TARLONG_FORMAT " (%s, %s/s)",
+ numbytes,
+ human_readable (numbytes, abbr, human_opts, 1, 1),
+ (0 < duration && numbytes / duration < (uintmax_t) -1
+ ? human_readable (numbytes / duration, rate, human_opts, 1, 1)
+ : "?"));
+}
+
+/* Format totals to file FP. FORMATS is an array of strings to output
+ before each data item (bytes read, written, deleted, in that order).
+ EOR is a delimiter to output after each item (used only if deleting
+ from the archive), EOL is a delimiter to add at the end of the output
+ line. */
+int
+format_total_stats (FILE *fp, const char **formats, int eor, int eol)
+{
+ int n;
+
+ switch (subcommand_option)
+ {
+ case CREATE_SUBCOMMAND:
+ case CAT_SUBCOMMAND:
+ case UPDATE_SUBCOMMAND:
+ case APPEND_SUBCOMMAND:
+ n = print_stats (fp, formats[TF_WRITE],
+ prev_written + bytes_written);
+ break;
+
+ case DELETE_SUBCOMMAND:
+ {
+ char buf[UINTMAX_STRSIZE_BOUND];
+ n = print_stats (fp, formats[TF_READ],
+ records_read * record_size);
+
+ fputc (eor, fp);
+ n++;
+
+ n += print_stats (fp, formats[TF_WRITE],
+ prev_written + bytes_written);
+
+ fputc (eor, fp);
+ n++;
+
+ if (formats[TF_DELETED] && formats[TF_DELETED][0])
+ n += fprintf (fp, "%s: ", gettext (formats[TF_DELETED]));
+ n += fprintf (fp, "%s",
+ STRINGIFY_BIGINT ((records_read - records_skipped)
+ * record_size
+ - (prev_written + bytes_written), buf));
+ }
+ break;
+
+ case EXTRACT_SUBCOMMAND:
+ case LIST_SUBCOMMAND:
+ case DIFF_SUBCOMMAND:
+ n = print_stats (fp, _(formats[TF_READ]),
+ records_read * record_size);
+ break;
+
+ default:
+ abort ();
+ }
+ if (eol)
+ {
+ fputc (eol, fp);
+ n++;
+ }
+ return n;
+}
+
+const char *default_total_format[] = {
+ N_("Total bytes read"),
+ /* Amanda 2.4.1p1 looks for "Total bytes written: [0-9][0-9]*". */
+ N_("Total bytes written"),
+ N_("Total bytes deleted")
+};
-/*
- * Remember a union record * as pointing to something that we
- * need to keep when reading onward in the file. Only one such
- * thing can be remembered at once, and it only works when reading
- * an archive.
- *
- * We calculate "offset" then add it because some compilers end up
- * adding (baserec+ar_record), doing a 9-bit shift of baserec, then
- * subtracting ar_block from that, shifting it back, losing the top 9 bits.
- */
void
-saverec(pointer)
- union record **pointer;
+print_total_stats (void)
{
- long offset;
+ format_total_stats (stderr, default_total_format, '\n', '\n');
+}
- save_rec = pointer;
- offset = ar_record - ar_block;
- saved_recno = baserec + offset;
+/* Compute and return the block ordinal at current_block. */
+off_t
+current_block_ordinal (void)
+{
+ return record_start_block + (current_block - record_start);
}
-/*
- * Perform a write to flush the buffer.
- */
+/* If the EOF flag is set, reset it, as well as current_block, etc. */
+void
+reset_eof (void)
+{
+ if (hit_eof)
+ {
+ hit_eof = false;
+ current_block = record_start;
+ record_end = record_start + blocking_factor;
+ access_mode = ACCESS_WRITE;
+ }
+}
-/*send_buffer_to_file();
- if(new_volume) {
- deal_with_new_volume_stuff();
- send_buffer_to_file();
- }
- */
+/* Return the location of the next available input or output block.
+ Return zero for EOF. Once we have returned zero, we just keep returning
+ it, to avoid accidentally going on to the next file on the tape. */
+union block *
+find_next_block (void)
+{
+ if (current_block == record_end)
+ {
+ if (hit_eof)
+ return 0;
+ flush_archive ();
+ if (current_block == record_end)
+ {
+ hit_eof = true;
+ return 0;
+ }
+ }
+ return current_block;
+}
+/* Indicate that we have used all blocks up thru BLOCK. */
void
-fl_write()
-{
- int err;
- int copy_back;
- static long bytes_written = 0;
-
- if (f_checkpoint && ! (++checkpoint % 10))
- msg ("Write checkpoint %d\n", checkpoint);
- if(tape_length && bytes_written >= tape_length * 1024) {
- errno = ENOSPC;
- err = 0;
- } else
- err = rmtwrite(archive, ar_block->charptr,(int) blocksize);
- if(err!=blocksize && !f_multivol)
- writeerror(err);
- else if (f_totals)
- tot_written += blocksize;
-
- if(err>0)
- bytes_written+=err;
- if (err == blocksize) {
- if(f_multivol) {
- if(!save_name) {
- real_s_name[0]='\0';
- real_s_totsize=0;
- real_s_sizeleft = 0;
- return;
- }
-#ifdef __MSDOS__
- if(save_name[1]==':')
- save_name+=2;
-#endif
- while(*save_name=='/')
- save_name++;
-
- strcpy(real_s_name,save_name);
- real_s_totsize = save_totsize;
- real_s_sizeleft = save_sizeleft;
- }
- return;
- }
+set_next_block_after (union block *block)
+{
+ while (block >= current_block)
+ current_block++;
- /* We're multivol Panic if we didn't get the right kind of response */
- /* ENXIO is for the UNIX PC */
- if(err<0 && errno!=ENOSPC && errno!=EIO && errno!=ENXIO)
- writeerror(err);
-
- /* If error indicates a short write, we just move to the next tape. */
-
- if(new_volume(0)<0)
- return;
- bytes_written=0;
- if(f_volhdr && real_s_name[0]) {
- copy_back=2;
- ar_block-=2;
- } else if(f_volhdr || real_s_name[0]) {
- copy_back = 1;
- ar_block--;
- } else
- copy_back = 0;
- if(f_volhdr) {
- bzero((void *)ar_block,RECORDSIZE);
- sprintf(ar_block->header.name,"%s Volume %d",f_volhdr,volno);
- to_oct(time(0), 1+12, ar_block->header.mtime);
- ar_block->header.linkflag = LF_VOLHDR;
- finish_header(ar_block);
- }
- if(real_s_name[0]) {
- int tmp;
-
- if(f_volhdr)
- ar_block++;
- bzero((void *)ar_block,RECORDSIZE);
- strcpy(ar_block->header.name,real_s_name);
- ar_block->header.linkflag = LF_MULTIVOL;
- to_oct((long)real_s_sizeleft,1+12,
- ar_block->header.size);
- to_oct((long)real_s_totsize-real_s_sizeleft,
- 1+12,ar_block->header.offset);
- tmp=f_verbose;
- f_verbose=0;
- finish_header(ar_block);
- f_verbose=tmp;
- if(f_volhdr)
- ar_block--;
- }
+ /* Do *not* flush the archive here. If we do, the same argument to
+ set_next_block_after could mean the next block (if the input record
+ is exactly one block long), which is not what is intended. */
- err = rmtwrite(archive, ar_block->charptr,(int) blocksize);
- if(err!=blocksize)
- writeerror(err);
- else if (f_totals)
- tot_written += blocksize;
-
-
- bytes_written = blocksize;
- if(copy_back) {
- ar_block+=copy_back;
- bcopy((void *)(ar_block+blocking-copy_back),
- (void *)ar_record,
- copy_back*RECORDSIZE);
- ar_record+=copy_back;
-
- if(real_s_sizeleft>=copy_back*RECORDSIZE)
- real_s_sizeleft-=copy_back*RECORDSIZE;
- else if((real_s_sizeleft+RECORDSIZE-1)/RECORDSIZE<=copy_back)
- real_s_name[0] = '\0';
- else {
-#ifdef __MSDOS__
- if(save_name[1]==':')
- save_name+=2;
-#endif
- while(*save_name=='/')
- save_name++;
-
- strcpy(real_s_name,save_name);
- real_s_sizeleft = save_sizeleft;
- real_s_totsize=save_totsize;
- }
- copy_back = 0;
- }
+ if (current_block > record_end)
+ abort ();
}
-/* Handle write errors on the archive. Write errors are always fatal */
-/* Hitting the end of a volume does not cause a write error unless the write
-* was the first block of the volume */
+/* Return the number of bytes comprising the space between POINTER
+ through the end of the current buffer of blocks. This space is
+ available for filling with data, or taking data from. POINTER is
+ usually (but not always) the result of previous find_next_block call. */
+size_t
+available_space_after (union block *pointer)
+{
+ return record_end->buffer - pointer->buffer;
+}
+/* Close file having descriptor FD, and abort if close unsuccessful. */
void
-writeerror(err)
-int err;
-{
- if (err < 0) {
- msg_perror("can't write to %s",ar_files[cur_ar_file]);
- exit(EX_BADARCH);
- } else {
- msg("only wrote %u of %u bytes to %s",err,blocksize,ar_files[cur_ar_file]);
- exit(EX_BADARCH);
- }
+xclose (int fd)
+{
+ if (close (fd) != 0)
+ close_error (_("(pipe)"));
}
-/*
- * Handle read errors on the archive.
- *
- * If the read should be retried, readerror() returns to the caller.
- */
-void
-readerror()
+static void
+init_buffer (void)
{
-# define READ_ERROR_MAX 10
+ if (! record_buffer_aligned[record_index])
+ record_buffer_aligned[record_index] =
+ page_aligned_alloc (&record_buffer[record_index], record_size);
- read_error_flag++; /* Tell callers */
+ record_start = record_buffer_aligned[record_index];
+ current_block = record_start;
+ record_end = record_start + blocking_factor;
+}
- msg_perror("read error on %s",ar_files[cur_ar_file]);
+/* Open an archive file. The argument specifies whether we are
+ reading or writing, or both. */
+static void
+_open_archive (enum access_mode wanted_access)
+{
+ int backed_up_flag = 0;
- if (baserec == 0) {
- /* First block of tape. Probably stupidity error */
- exit(EX_BADARCH);
- }
+ if (record_size == 0)
+ FATAL_ERROR ((0, 0, _("Invalid value for record_size")));
+
+ if (archive_names == 0)
+ FATAL_ERROR ((0, 0, _("No archive name given")));
+
+ tar_stat_destroy (¤t_stat_info);
+
+ record_index = 0;
+ init_buffer ();
+
+ /* When updating the archive, we start with reading. */
+ access_mode = wanted_access == ACCESS_UPDATE ? ACCESS_READ : wanted_access;
+
+ read_full_records = read_full_records_option;
+
+ records_read = 0;
+
+ if (use_compress_program_option)
+ {
+ switch (wanted_access)
+ {
+ case ACCESS_READ:
+ child_pid = sys_child_open_for_uncompress ();
+ read_full_records = true;
+ record_end = record_start; /* set up for 1st record = # 0 */
+ break;
+
+ case ACCESS_WRITE:
+ child_pid = sys_child_open_for_compress ();
+ break;
+
+ case ACCESS_UPDATE:
+ abort (); /* Should not happen */
+ break;
+ }
+
+ if (!index_file_name
+ && wanted_access == ACCESS_WRITE
+ && strcmp (archive_name_array[0], "-") == 0)
+ stdlis = stderr;
+ }
+ else if (strcmp (archive_name_array[0], "-") == 0)
+ {
+ read_full_records = true; /* could be a pipe, be safe */
+ if (verify_option)
+ FATAL_ERROR ((0, 0, _("Cannot verify stdin/stdout archive")));
+
+ switch (wanted_access)
+ {
+ case ACCESS_READ:
+ {
+ bool shortfile;
+ enum compress_type type;
+
+ archive = STDIN_FILENO;
+
+ type = check_compressed_archive (&shortfile);
+ if (type != ct_tar && type != ct_none)
+ FATAL_ERROR ((0, 0,
+ _("Archive is compressed. Use %s option"),
+ compress_option (type)));
+ if (shortfile)
+ ERROR ((0, 0, _("This does not look like a tar archive")));
+ }
+ break;
+
+ case ACCESS_WRITE:
+ archive = STDOUT_FILENO;
+ if (!index_file_name)
+ stdlis = stderr;
+ break;
+
+ case ACCESS_UPDATE:
+ archive = STDIN_FILENO;
+ write_archive_to_stdout = true;
+ record_end = record_start; /* set up for 1st record = # 0 */
+ if (!index_file_name)
+ stdlis = stderr;
+ break;
+ }
+ }
+ else
+ switch (wanted_access)
+ {
+ case ACCESS_READ:
+ archive = open_compressed_archive ();
+ if (archive >= 0)
+ guess_seekable_archive ();
+ break;
+
+ case ACCESS_WRITE:
+ if (backup_option)
+ {
+ maybe_backup_file (archive_name_array[0], 1);
+ backed_up_flag = 1;
+ }
+ if (verify_option)
+ archive = rmtopen (archive_name_array[0], O_RDWR | O_CREAT | O_BINARY,
+ MODE_RW, rsh_command_option);
+ else
+ archive = rmtcreat (archive_name_array[0], MODE_RW,
+ rsh_command_option);
+ break;
+
+ case ACCESS_UPDATE:
+ archive = rmtopen (archive_name_array[0],
+ O_RDWR | O_CREAT | O_BINARY,
+ MODE_RW, rsh_command_option);
+
+ switch (check_compressed_archive (NULL))
+ {
+ case ct_none:
+ case ct_tar:
+ break;
+
+ default:
+ FATAL_ERROR ((0, 0,
+ _("Cannot update compressed archives")));
+ }
+ break;
+ }
+
+ if (archive < 0
+ || (! _isrmt (archive) && !sys_get_archive_stat ()))
+ {
+ int saved_errno = errno;
+
+ if (backed_up_flag)
+ undo_last_backup ();
+ errno = saved_errno;
+ open_fatal (archive_name_array[0]);
+ }
+
+ sys_detect_dev_null_output ();
+ sys_save_archive_dev_ino ();
+ SET_BINARY_MODE (archive);
+
+ switch (wanted_access)
+ {
+ case ACCESS_READ:
+ find_next_block (); /* read it in, check for EOF */
+ break;
+
+ case ACCESS_UPDATE:
+ case ACCESS_WRITE:
+ records_written = 0;
+ break;
+ }
+}
+
+/* Perform a write to flush the buffer. */
+static ssize_t
+_flush_write (void)
+{
+ ssize_t status;
+
+ checkpoint_run (true);
+ if (tape_length_option && tape_length_option <= bytes_written)
+ {
+ errno = ENOSPC;
+ status = 0;
+ }
+ else if (dev_null_output)
+ status = record_size;
+ else
+ status = sys_write_archive_buffer ();
- /*
- * Read error in mid archive. We retry up to READ_ERROR_MAX times
- * and then give up on reading the archive. We set read_error_flag
- * for our callers, so they can cope if they want.
- */
- if (r_error_count++ > READ_ERROR_MAX) {
- msg("Too many errors, quitting.");
- exit(EX_BADARCH);
+ if (status && multi_volume_option && !inhibit_map)
+ {
+ struct bufmap *map = bufmap_locate (status);
+ if (map)
+ {
+ size_t delta = status - map->start * BLOCKSIZE;
+ if (delta > map->sizeleft)
+ delta = map->sizeleft;
+ map->sizeleft -= delta;
+ if (map->sizeleft == 0)
+ map = map->next;
+ bufmap_reset (map, map ? (- map->start) : 0);
}
- return;
+ }
+ return status;
}
+/* Handle write errors on the archive. Write errors are always fatal.
+ Hitting the end of a volume does not cause a write error unless the
+ write was the first record of the volume. */
+void
+archive_write_error (ssize_t status)
+{
+ /* It might be useful to know how much was written before the error
+ occurred. */
+ if (totals_option)
+ {
+ int e = errno;
+ print_total_stats ();
+ errno = e;
+ }
+
+ write_fatal_details (*archive_name_cursor, status, record_size);
+}
-/*
- * Perform a read to flush the buffer.
- */
+/* Handle read errors on the archive. If the read should be retried,
+ return to the caller. */
void
-fl_read()
-{
- int err; /* Result from system call */
- int left; /* Bytes left */
- char *more; /* Pointer to next byte to read */
-
- if (f_checkpoint && ! (++checkpoint % 10))
- msg ("Read checkpoint %d\n", checkpoint);
-
- /*
- * Clear the count of errors. This only applies to a single
- * call to fl_read. We leave read_error_flag alone; it is
- * only turned off by higher level software.
- */
- r_error_count = 0; /* Clear error count */
-
- /*
- * If we are about to wipe out a record that
- * somebody needs to keep, copy it out to a holding
- * area and adjust somebody's pointer to it.
- */
- if (save_rec &&
- *save_rec >= ar_record &&
- *save_rec < ar_last) {
- record_save_area = **save_rec;
- *save_rec = &record_save_area;
- }
- if(write_archive_to_stdout && baserec!=0) {
- err=rmtwrite(1, ar_block->charptr, blocksize);
- if(err!=blocksize)
- writeerror(err);
- }
- if(f_multivol) {
- if(save_name) {
- if(save_name!=real_s_name) {
-#ifdef __MSDOS__
- if(save_name[1]==':')
- save_name+=2;
-#endif
- while(*save_name=='/')
- save_name++;
-
- strcpy(real_s_name,save_name);
- save_name=real_s_name;
- }
- real_s_totsize = save_totsize;
- real_s_sizeleft = save_sizeleft;
-
- } else {
- real_s_name[0]='\0';
- real_s_totsize=0;
- real_s_sizeleft = 0;
- }
- }
+archive_read_error (void)
+{
+ read_error (*archive_name_cursor);
-error_loop:
- err = rmtread(archive, ar_block->charptr, (int)blocksize);
- if (err == blocksize)
- return;
-
- if((err == 0 || (err<0 && errno==ENOSPC) || (err > 0 && !f_reblock)) && f_multivol) {
- union record *head;
-
- try_volume:
- if(new_volume((cmd_mode==CMD_APPEND || cmd_mode==CMD_CAT || cmd_mode==CMD_UPDATE) ? 2 : 1)<0)
- return;
- vol_error:
- err = rmtread(archive, ar_block->charptr,(int) blocksize);
- if(err < 0) {
- readerror();
- goto vol_error;
- }
- if(err!=blocksize)
- goto short_read;
-
- head=ar_block;
-
- if(head->header.linkflag==LF_VOLHDR) {
- if(f_volhdr) {
-#if 0
- char *ptr;
-
- ptr=(char *)malloc(strlen(f_volhdr)+20);
- sprintf(ptr,"%s Volume %d",f_volhdr,volno);
-#endif
- if (re_match (label_pattern, head->header.name,
- strlen (head->header.name),
- 0, 0) < 0) {
- msg("Volume mismatch! %s!=%s",f_volhdr,
- head->header.name);
- --volno;
- --global_volno;
- goto try_volume;
- }
-
-#if 0
- if(strcmp(ptr,head->header.name)) {
- msg("Volume mismatch! %s!=%s",ptr,head->header.name);
- --volno;
- --global_volno;
- free(ptr);
- goto try_volume;
- }
- free(ptr);
-#endif
- }
- if(f_verbose)
- fprintf(msg_file,"Reading %s\n",head->header.name);
- head++;
- } else if(f_volhdr) {
- msg("Warning: No volume header!");
- }
-
- if(real_s_name[0]) {
- long from_oct();
-
- if(head->header.linkflag!=LF_MULTIVOL || strcmp(head->header.name,real_s_name)) {
- msg("%s is not continued on this volume!",real_s_name);
- --volno;
- --global_volno;
- goto try_volume;
- }
- if(real_s_totsize!=from_oct(1+12,head->header.size)+from_oct(1+12,head->header.offset)) {
- msg("%s is the wrong size (%ld!=%ld+%ld)",
- head->header.name,save_totsize,
- from_oct(1+12,head->header.size),
- from_oct(1+12,head->header.offset));
- --volno;
- --global_volno;
- goto try_volume;
- }
- if(real_s_totsize-real_s_sizeleft!=from_oct(1+12,head->header.offset)) {
- msg("This volume is out of sequence");
- --volno;
- --global_volno;
- goto try_volume;
- }
- head++;
- }
- ar_record=head;
- return;
- } else if (err < 0) {
- readerror();
- goto error_loop; /* Try again */
- }
+ if (record_start_block == 0)
+ FATAL_ERROR ((0, 0, _("At beginning of tape, quitting now")));
- short_read:
- more = ar_block->charptr + err;
- left = blocksize - err;
-
-again:
- if (0 == (((unsigned)left) % RECORDSIZE)) {
- /* FIXME, for size=0, multi vol support */
- /* On the first block, warn about the problem */
- if (!f_reblock && baserec == 0 && f_verbose && err > 0) {
- /* msg("Blocksize = %d record%s",
- err / RECORDSIZE, (err > RECORDSIZE)? "s": "");*/
- msg("Blocksize = %d records", err / RECORDSIZE);
- }
- ar_last = ar_block + ((unsigned)(blocksize - left))/RECORDSIZE;
- return;
- }
- if (f_reblock) {
- /*
- * User warned us about this. Fix up.
- */
- if (left > 0) {
-error2loop:
- err = rmtread(archive, more, (int)left);
- if (err < 0) {
- readerror();
- goto error2loop; /* Try again */
- }
- if (err == 0) {
- msg("archive %s EOF not on block boundary",ar_files[cur_ar_file]);
- exit(EX_BADARCH);
- }
- left -= err;
- more += err;
- goto again;
- }
- } else {
- msg("only read %d bytes from archive %s",err,ar_files[cur_ar_file]);
- exit(EX_BADARCH);
- }
+ /* Read error in mid archive. We retry up to READ_ERROR_MAX times and
+ then give up on reading the archive. */
+
+ if (read_error_count++ > READ_ERROR_MAX)
+ FATAL_ERROR ((0, 0, _("Too many errors, quitting")));
+ return;
}
+static bool
+archive_is_dev (void)
+{
+ struct stat st;
-/*
- * Flush the current buffer to/from the archive.
- */
-void
-flush_archive()
-{
- int c;
-
- baserec += ar_last - ar_block; /* Keep track of block #s */
- ar_record = ar_block; /* Restore pointer to start */
- ar_last = ar_block + blocking; /* Restore pointer to end */
-
- if (ar_reading) {
- if(time_to_start_writing) {
- time_to_start_writing=0;
- ar_reading=0;
-
- if(file_to_switch_to>=0) {
- if((c=rmtclose(archive))<0)
- msg_perror("Warning: can't close %s(%d,%d)",ar_files[cur_ar_file],archive,c);
-
- archive=file_to_switch_to;
- } else
- (void)backspace_output();
- fl_write();
- } else
- fl_read();
- } else {
- fl_write();
- }
+ if (fstat (archive, &st))
+ {
+ stat_diag (*archive_name_cursor);
+ return false;
+ }
+ return S_ISBLK (st.st_mode) || S_ISCHR (st.st_mode);
}
-/* Backspace the archive descriptor by one blocks worth.
- If its a tape, MTIOCTOP will work. If its something else,
- we try to seek on it. If we can't seek, we lose! */
-int
-backspace_output()
+static void
+short_read (size_t status)
+{
+ size_t left; /* bytes left */
+ char *more; /* pointer to next byte to read */
+
+ more = record_start->buffer + status;
+ left = record_size - status;
+
+ if (left && left % BLOCKSIZE == 0
+ && (warning_option & WARN_RECORD_SIZE)
+ && record_start_block == 0 && status != 0
+ && archive_is_dev ())
+ {
+ unsigned long rsize = status / BLOCKSIZE;
+ WARN ((0, 0,
+ ngettext ("Record size = %lu block",
+ "Record size = %lu blocks",
+ rsize),
+ rsize));
+ }
+
+ while (left % BLOCKSIZE != 0
+ || (left && status && read_full_records))
+ {
+ if (status)
+ while ((status = rmtread (archive, more, left)) == SAFE_READ_ERROR)
+ archive_read_error ();
+
+ if (status == 0)
+ break;
+
+ if (! read_full_records)
+ {
+ unsigned long rest = record_size - left;
+
+ FATAL_ERROR ((0, 0,
+ ngettext ("Unaligned block (%lu byte) in archive",
+ "Unaligned block (%lu bytes) in archive",
+ rest),
+ rest));
+ }
+
+ left -= status;
+ more += status;
+ }
+
+ record_end = record_start + (record_size - left) / BLOCKSIZE;
+ records_read++;
+}
+
+/* Flush the current buffer to/from the archive. */
+void
+flush_archive (void)
{
- long cur;
- /* int er; */
- extern char *output_start;
+ size_t buffer_level = current_block->buffer - record_start->buffer;
+ record_start_block += record_end - record_start;
+ current_block = record_start;
+ record_end = record_start + blocking_factor;
+ if (access_mode == ACCESS_READ && time_to_start_writing)
+ {
+ access_mode = ACCESS_WRITE;
+ time_to_start_writing = false;
+ backspace_output ();
+ }
+
+ switch (access_mode)
+ {
+ case ACCESS_READ:
+ flush_read ();
+ break;
+
+ case ACCESS_WRITE:
+ flush_write_ptr (buffer_level);
+ break;
+
+ case ACCESS_UPDATE:
+ abort ();
+ }
+}
+
+/* Backspace the archive descriptor by one record worth. If it's a
+ tape, MTIOCTOP will work. If it's something else, try to seek on
+ it. If we can't seek, we lose! */
+static void
+backspace_output (void)
+{
#ifdef MTIOCTOP
- struct mtop t;
-
- t.mt_op = MTBSR;
- t.mt_count = 1;
- if((rmtioctl(archive,MTIOCTOP,&t))>=0)
- return 1;
- if(errno==EIO && (rmtioctl(archive,MTIOCTOP,&t))>=0)
- return 1;
+ {
+ struct mtop operation;
+
+ operation.mt_op = MTBSR;
+ operation.mt_count = 1;
+ if (rmtioctl (archive, MTIOCTOP, (char *) &operation) >= 0)
+ return;
+ if (errno == EIO && rmtioctl (archive, MTIOCTOP, (char *) &operation) >= 0)
+ return;
+ }
#endif
- cur=rmtlseek(archive,0L,1);
- cur-=blocksize;
- /* Seek back to the beginning of this block and
- start writing there. */
-
- if(rmtlseek(archive,cur,0)!=cur) {
- /* Lseek failed. Try a different method */
- msg("Couldn't backspace archive file. It may be unreadable without -i.");
- /* Replace the first part of the block with nulls */
- if(ar_block->charptr!=output_start)
- bzero(ar_block->charptr,output_start-ar_block->charptr);
- return 2;
- }
- return 3;
+ {
+ off_t position = rmtlseek (archive, (off_t) 0, SEEK_CUR);
+
+ /* Seek back to the beginning of this record and start writing there. */
+
+ position -= record_size;
+ if (position < 0)
+ position = 0;
+ if (rmtlseek (archive, position, SEEK_SET) != position)
+ {
+ /* Lseek failed. Try a different method. */
+
+ WARN ((0, 0,
+ _("Cannot backspace archive file; it may be unreadable without -i")));
+
+ /* Replace the first part of the record with NULs. */
+
+ if (record_start->buffer != output_start)
+ memset (record_start->buffer, 0,
+ output_start - record_start->buffer);
+ }
+ }
}
+off_t
+seek_archive (off_t size)
+{
+ off_t start = current_block_ordinal ();
+ off_t offset;
+ off_t nrec, nblk;
+ off_t skipped = (blocking_factor - (current_block - record_start))
+ * BLOCKSIZE;
+
+ if (size <= skipped)
+ return 0;
+
+ /* Compute number of records to skip */
+ nrec = (size - skipped) / record_size;
+ if (nrec == 0)
+ return 0;
+ offset = rmtlseek (archive, nrec * record_size, SEEK_CUR);
+ if (offset < 0)
+ return offset;
+
+ if (offset % record_size)
+ FATAL_ERROR ((0, 0, _("rmtlseek not stopped at a record boundary")));
+
+ /* Convert to number of records */
+ offset /= BLOCKSIZE;
+ /* Compute number of skipped blocks */
+ nblk = offset - start;
+
+ /* Update buffering info */
+ records_read += nblk / blocking_factor;
+ record_start_block = offset - blocking_factor;
+ current_block = record_end;
+
+ return nblk;
+}
-/*
- * Close the archive file.
- */
+/* Close the archive file. */
void
-close_archive()
-{
- int child;
- int status;
- int c;
-
- if (time_to_start_writing || !ar_reading)
- flush_archive();
- if(cmd_mode==CMD_DELETE) {
- off_t pos;
-
- pos = rmtlseek(archive,0L,1);
-#ifndef __MSDOS__
- (void) ftruncate(archive,pos);
-#else
- (void)rmtwrite(archive,"",0);
-#endif
- }
- if(f_verify)
- verify_volume();
-
- if((c=rmtclose(archive))<0)
- msg_perror("Warning: can't close %s(%d,%d)",ar_files[cur_ar_file],archive,c);
-
-#ifndef __MSDOS__
- if (childpid) {
- /*
- * Loop waiting for the right child to die, or for
- * no more kids.
- */
- while (((child = wait(&status)) != childpid) && child != -1)
- ;
-
- if (child != -1) {
- switch (WTERMSIG(status)) {
- case 0:
- /* Child voluntarily terminated -- but why? */
- if (WEXITSTATUS(status) == MAGIC_STAT) {
- exit(EX_SYSTEM);/* Child had trouble */
- }
- if (WEXITSTATUS(status) == (SIGPIPE + 128)) {
- /*
- * /bin/sh returns this if its child
- * dies with SIGPIPE. 'Sok.
- */
- break;
- } else if (WEXITSTATUS(status))
- msg("child returned status %d",
- WEXITSTATUS(status));
- case SIGPIPE:
- break; /* This is OK. */
-
- default:
- msg("child died with signal %d%s",
- WTERMSIG(status),
- WIFCOREDUMPED(status)? " (core dumped)": "");
- }
- }
- }
-#endif /* __MSDOS__ */
-}
-
-
-#ifdef DONTDEF
-/*
- * Message management.
- *
- * anno writes a message prefix on stream (eg stdout, stderr).
- *
- * The specified prefix is normally output followed by a colon and a space.
- * However, if other command line options are set, more output can come
- * out, such as the record # within the archive.
- *
- * If the specified prefix is NULL, no output is produced unless the
- * command line option(s) are set.
- *
- * If the third argument is 1, the "saved" record # is used; if 0, the
- * "current" record # is used.
- */
+close_archive (void)
+{
+ if (time_to_start_writing || access_mode == ACCESS_WRITE)
+ {
+ flush_archive ();
+ if (current_block > record_start)
+ flush_archive ();
+ }
+
+ compute_duration ();
+ if (verify_option)
+ verify_volume ();
+
+ if (rmtclose (archive) != 0)
+ close_error (*archive_name_cursor);
+
+ sys_wait_for_child (child_pid, hit_eof);
+
+ tar_stat_destroy (¤t_stat_info);
+ free (record_buffer[0]);
+ free (record_buffer[1]);
+ bufmap_free (NULL);
+}
+
+/* Called to initialize the global volume number. */
void
-anno(stream, prefix, savedp)
- FILE *stream;
- char *prefix;
- int savedp;
-{
-# define MAXANNO 50
- char buffer[MAXANNO]; /* Holds annorecment */
-# define ANNOWIDTH 13
- int space;
- long offset;
- int save_e;
-
- save_e=errno;
- /* Make sure previous output gets out in sequence */
- if (stream == stderr)
- fflush(stdout);
- if (f_sayblock) {
- if (prefix) {
- fputs(prefix, stream);
- putc(' ', stream);
- }
- offset = ar_record - ar_block;
- (void) sprintf(buffer, "rec %d: ",
- savedp? saved_recno:
- baserec + offset);
- fputs(buffer, stream);
- space = ANNOWIDTH - strlen(buffer);
- if (space > 0) {
- fprintf(stream, "%*s", space, "");
- }
- } else if (prefix) {
- fputs(prefix, stream);
- fputs(": ", stream);
- }
- errno=save_e;
+init_volume_number (void)
+{
+ FILE *file = fopen (volno_file_option, "r");
+
+ if (file)
+ {
+ if (fscanf (file, "%d", &global_volno) != 1
+ || global_volno < 0)
+ FATAL_ERROR ((0, 0, _("%s: contains invalid volume number"),
+ quotearg_colon (volno_file_option)));
+ if (ferror (file))
+ read_error (volno_file_option);
+ if (fclose (file) != 0)
+ close_error (volno_file_option);
+ }
+ else if (errno != ENOENT)
+ open_error (volno_file_option);
}
-#endif
-/* Called to initialize the global volume number. */
-int
-init_volume_number ()
+/* Called to write out the closing global volume number. */
+void
+closeout_volume_number (void)
{
- FILE *vf;
-
- vf = fopen (f_volno_file, "r");
- if (!vf && errno != ENOENT)
- msg_perror ("%s", f_volno_file);
-
- if (vf)
+ FILE *file = fopen (volno_file_option, "w");
+
+ if (file)
{
- fscanf (vf, "%d", &global_volno);
- fclose (vf);
+ fprintf (file, "%d\n", global_volno);
+ if (ferror (file))
+ write_error (volno_file_option);
+ if (fclose (file) != 0)
+ close_error (volno_file_option);
}
+ else
+ open_error (volno_file_option);
}
-/* Called to write out the closing global volume number. */
-int
-closeout_volume_number ()
+\f
+static void
+increase_volume_number (void)
{
- FILE *vf;
-
- vf = fopen (f_volno_file, "w");
- if (!vf)
- msg_perror ("%s", f_volno_file);
+ global_volno++;
+ if (global_volno < 0)
+ FATAL_ERROR ((0, 0, _("Volume number overflow")));
+ volno++;
+}
+
+static void
+change_tape_menu (FILE *read_file)
+{
+ char *input_buffer = NULL;
+ size_t size = 0;
+ bool stop = false;
+
+ while (!stop)
+ {
+ fputc ('\007', stderr);
+ fprintf (stderr,
+ _("Prepare volume #%d for %s and hit return: "),
+ global_volno + 1, quote (*archive_name_cursor));
+ fflush (stderr);
+
+ if (getline (&input_buffer, &size, read_file) <= 0)
+ {
+ WARN ((0, 0, _("EOF where user reply was expected")));
+
+ if (subcommand_option != EXTRACT_SUBCOMMAND
+ && subcommand_option != LIST_SUBCOMMAND
+ && subcommand_option != DIFF_SUBCOMMAND)
+ WARN ((0, 0, _("WARNING: Archive is incomplete")));
+
+ fatal_exit ();
+ }
+
+ if (input_buffer[0] == '\n'
+ || input_buffer[0] == 'y'
+ || input_buffer[0] == 'Y')
+ break;
+
+ switch (input_buffer[0])
+ {
+ case '?':
+ {
+ fprintf (stderr, _("\
+ n name Give a new file name for the next (and subsequent) volume(s)\n\
+ q Abort tar\n\
+ y or newline Continue operation\n"));
+ if (!restrict_option)
+ fprintf (stderr, _(" ! Spawn a subshell\n"));
+ fprintf (stderr, _(" ? Print this list\n"));
+ }
+ break;
+
+ case 'q':
+ /* Quit. */
+
+ WARN ((0, 0, _("No new volume; exiting.\n")));
+
+ if (subcommand_option != EXTRACT_SUBCOMMAND
+ && subcommand_option != LIST_SUBCOMMAND
+ && subcommand_option != DIFF_SUBCOMMAND)
+ WARN ((0, 0, _("WARNING: Archive is incomplete")));
+
+ fatal_exit ();
+
+ case 'n':
+ /* Get new file name. */
+
+ {
+ char *name;
+ char *cursor;
+
+ for (name = input_buffer + 1;
+ *name == ' ' || *name == '\t';
+ name++)
+ ;
+
+ for (cursor = name; *cursor && *cursor != '\n'; cursor++)
+ ;
+ *cursor = '\0';
+
+ if (name[0])
+ {
+ /* FIXME: the following allocation is never reclaimed. */
+ *archive_name_cursor = xstrdup (name);
+ stop = true;
+ }
+ else
+ fprintf (stderr, "%s",
+ _("File name not specified. Try again.\n"));
+ }
+ break;
+
+ case '!':
+ if (!restrict_option)
+ {
+ sys_spawn_shell ();
+ break;
+ }
+ /* FALL THROUGH */
+
+ default:
+ fprintf (stderr, _("Invalid input. Type ? for help.\n"));
+ }
+ }
+ free (input_buffer);
+}
+
+/* We've hit the end of the old volume. Close it and open the next one.
+ Return nonzero on success.
+*/
+static bool
+new_volume (enum access_mode mode)
+{
+ static FILE *read_file;
+ static int looped;
+ int prompt;
+
+ if (!read_file && !info_script_option)
+ /* FIXME: if fopen is used, it will never be closed. */
+ read_file = archive == STDIN_FILENO ? fopen (TTY_NAME, "r") : stdin;
+
+ if (now_verifying)
+ return false;
+ if (verify_option)
+ verify_volume ();
+
+ assign_string (&volume_label, NULL);
+ assign_string (&continued_file_name, NULL);
+ continued_file_size = continued_file_offset = 0;
+ current_block = record_start;
+
+ if (rmtclose (archive) != 0)
+ close_error (*archive_name_cursor);
+
+ archive_name_cursor++;
+ if (archive_name_cursor == archive_name_array + archive_names)
+ {
+ archive_name_cursor = archive_name_array;
+ looped = 1;
+ }
+ prompt = looped;
+
+ tryagain:
+ if (prompt)
+ {
+ /* We have to prompt from now on. */
+
+ if (info_script_option)
+ {
+ if (volno_file_option)
+ closeout_volume_number ();
+ if (sys_exec_info_script (archive_name_cursor, global_volno+1))
+ FATAL_ERROR ((0, 0, _("%s command failed"),
+ quote (info_script_option)));
+ }
+ else
+ change_tape_menu (read_file);
+ }
+
+ if (strcmp (archive_name_cursor[0], "-") == 0)
+ {
+ read_full_records = true;
+ archive = STDIN_FILENO;
+ }
+ else if (verify_option)
+ archive = rmtopen (*archive_name_cursor, O_RDWR | O_CREAT, MODE_RW,
+ rsh_command_option);
else
+ switch (mode)
+ {
+ case ACCESS_READ:
+ archive = rmtopen (*archive_name_cursor, O_RDONLY, MODE_RW,
+ rsh_command_option);
+ guess_seekable_archive ();
+ break;
+
+ case ACCESS_WRITE:
+ if (backup_option)
+ maybe_backup_file (*archive_name_cursor, 1);
+ archive = rmtcreat (*archive_name_cursor, MODE_RW,
+ rsh_command_option);
+ break;
+
+ case ACCESS_UPDATE:
+ archive = rmtopen (*archive_name_cursor, O_RDWR | O_CREAT, MODE_RW,
+ rsh_command_option);
+ break;
+ }
+
+ if (archive < 0)
{
- fprintf (vf, "%d\n", global_volno);
- fclose (vf);
+ open_warn (*archive_name_cursor);
+ if (!verify_option && mode == ACCESS_WRITE && backup_option)
+ undo_last_backup ();
+ prompt = 1;
+ goto tryagain;
}
+
+ SET_BINARY_MODE (archive);
+
+ return true;
}
-
-/* We've hit the end of the old volume. Close it and open the next one */
-/* Values for type: 0: writing 1: reading 2: updating */
-int
-new_volume(type)
-int type;
-{
- int c;
- char inbuf[80];
- char *p;
- static FILE *read_file = 0;
- extern int now_verifying;
- extern char TTY_NAME[];
- char *getenv();
- static int looped = 0;
-
- if(!read_file && !f_run_script_at_end)
- read_file = (archive==0) ? fopen(TTY_NAME, "r") : stdin;
-
- if(now_verifying)
- return -1;
- if(f_verify)
- verify_volume();
- if((c=rmtclose(archive))<0)
- msg_perror("Warning: can't close %s(%d,%d)",ar_files[cur_ar_file],archive,c);
-
- global_volno++;
- volno++;
- cur_ar_file++;
- if (cur_ar_file == n_ar_files)
+
+static bool
+read_header0 (struct tar_stat_info *info)
+{
+ enum read_header rc;
+
+ tar_stat_init (info);
+ rc = read_header (¤t_header, info, read_header_auto);
+ if (rc == HEADER_SUCCESS)
+ {
+ set_next_block_after (current_header);
+ return true;
+ }
+ ERROR ((0, 0, _("This does not look like a tar archive")));
+ return false;
+}
+
+static bool
+try_new_volume (void)
+{
+ size_t status;
+ union block *header;
+ enum access_mode acc;
+
+ switch (subcommand_option)
+ {
+ case APPEND_SUBCOMMAND:
+ case CAT_SUBCOMMAND:
+ case UPDATE_SUBCOMMAND:
+ acc = ACCESS_UPDATE;
+ break;
+
+ default:
+ acc = ACCESS_READ;
+ break;
+ }
+
+ if (!new_volume (acc))
+ return true;
+
+ while ((status = rmtread (archive, record_start->buffer, record_size))
+ == SAFE_READ_ERROR)
+ archive_read_error ();
+
+ if (status != record_size)
+ short_read (status);
+
+ header = find_next_block ();
+ if (!header)
+ return false;
+
+ switch (header->header.typeflag)
+ {
+ case XGLTYPE:
+ {
+ tar_stat_init (&dummy);
+ if (read_header (&header, &dummy, read_header_x_global)
+ != HEADER_SUCCESS_EXTENDED)
{
- cur_ar_file = 0;
- looped = 1;
+ ERROR ((0, 0, _("This does not look like a tar archive")));
+ return false;
}
-
- tryagain:
- if (looped)
+
+ xheader_decode (&dummy); /* decodes values from the global header */
+ tar_stat_destroy (&dummy);
+
+ /* The initial global header must be immediately followed by
+ an extended PAX header for the first member in this volume.
+ However, in some cases tar may split volumes in the middle
+ of a PAX header. This is incorrect, and should be fixed
+ in the future versions. In the meantime we must be
+ prepared to correctly list and extract such archives.
+
+ If this happens, the following call to read_header returns
+ HEADER_FAILURE, which is ignored.
+
+ See also tests/multiv07.at */
+
+ switch (read_header (&header, &dummy, read_header_auto))
{
- /* We have to prompt from now on. */
- if (f_run_script_at_end)
- system(info_script);
- else for(;;) {
- fprintf(msg_file,"\007Prepare volume #%d for %s and hit return: ",global_volno, ar_files[cur_ar_file]);
- fflush(msg_file);
- if(fgets(inbuf,sizeof(inbuf),read_file)==0) {
- fprintf(msg_file,"EOF? What does that mean?");
- if(cmd_mode!=CMD_EXTRACT && cmd_mode!=CMD_LIST && cmd_mode!=CMD_DIFF)
- msg("Warning: Archive is INCOMPLETE!");
- exit(EX_BADARCH);
- }
- if(inbuf[0]=='\n' || inbuf[0]=='y' || inbuf[0]=='Y')
- break;
-
- switch(inbuf[0]) {
- case '?':
- {
- fprintf(msg_file,"\
- n [name] Give a new filename for the next (and subsequent) volume(s)\n\
- q Abort tar\n\
- ! Spawn a subshell\n\
- ? Print this list\n");
- }
- break;
-
- case 'q': /* Quit */
- fprintf(msg_file,"No new volume; exiting.\n");
- if(cmd_mode!=CMD_EXTRACT && cmd_mode!=CMD_LIST && cmd_mode!=CMD_DIFF)
- msg("Warning: Archive is INCOMPLETE!");
- exit(EX_BADARCH);
-
- case 'n': /* Get new file name */
- {
- char *q,*r;
- static char *old_name;
-
- for(q= &inbuf[1];*q==' ' || *q=='\t';q++)
- ;
- for(r=q;*r;r++)
- if(*r=='\n')
- *r='\0';
- old_name=p=(char *)malloc((unsigned)(strlen(q)+2));
- if(p==0) {
- msg("Can't allocate memory for name");
- exit(EX_SYSTEM);
- }
- (void) strcpy(p,q);
- ar_files[cur_ar_file]=p;
- }
- break;
-
- case '!':
- #ifdef __MSDOS__
- spawnl(P_WAIT,getenv("COMSPEC"),"-",0);
- #else
- /* JF this needs work! */
- switch(fork()) {
- case -1:
- msg_perror("can't fork!");
- break;
- case 0:
- p=getenv("SHELL");
- if(p==0) p="/bin/sh";
- execlp(p,"-sh","-i",0);
- msg_perror("can't exec a shell %s",p);
- _exit(55);
- default:
- wait(0);
- break;
- }
- #endif
- break;
- }
- }
- }
-
+ case HEADER_SUCCESS:
+ set_next_block_after (header);
+ break;
- if(type==2 || f_verify)
- archive=rmtopen(ar_files[cur_ar_file],O_RDWR|O_CREAT,0666);
- else if(type==1)
- archive=rmtopen(ar_files[cur_ar_file],O_RDONLY,0666);
- else if(type==0)
- archive=rmtcreat(ar_file[cur_ar_file],0666);
- else
- archive= -1;
+ case HEADER_FAILURE:
+ break;
+
+ default:
+ ERROR ((0, 0, _("This does not look like a tar archive")));
+ return false;
+ }
+ break;
+ }
+
+ case GNUTYPE_VOLHDR:
+ if (!read_header0 (&dummy))
+ return false;
+ tar_stat_destroy (&dummy);
+ assign_string (&volume_label, current_header->header.name);
+ set_next_block_after (header);
+ header = find_next_block ();
+ if (header->header.typeflag != GNUTYPE_MULTIVOL)
+ break;
+ /* FALL THROUGH */
+
+ case GNUTYPE_MULTIVOL:
+ if (!read_header0 (&dummy))
+ return false;
+ tar_stat_destroy (&dummy);
+ assign_string (&continued_file_name, current_header->header.name);
+ continued_file_size =
+ UINTMAX_FROM_HEADER (current_header->header.size);
+ continued_file_offset =
+ UINTMAX_FROM_HEADER (current_header->oldgnu_header.offset);
+ break;
+
+ default:
+ break;
+ }
+
+ if (bufmap_head)
+ {
+ uintmax_t s;
+ if (!continued_file_name
+ || strcmp (continued_file_name, bufmap_head->file_name))
+ {
+ if ((archive_format == GNU_FORMAT || archive_format == OLDGNU_FORMAT)
+ && strlen (bufmap_head->file_name) >= NAME_FIELD_SIZE
+ && strncmp (continued_file_name, bufmap_head->file_name,
+ NAME_FIELD_SIZE) == 0)
+ WARN ((0, 0,
+ _("%s is possibly continued on this volume: header contains truncated name"),
+ quote (bufmap_head->file_name)));
+ else
+ {
+ WARN ((0, 0, _("%s is not continued on this volume"),
+ quote (bufmap_head->file_name)));
+ return false;
+ }
+ }
+
+ s = continued_file_size + continued_file_offset;
+
+ if (bufmap_head->sizetotal != s || s < continued_file_offset)
+ {
+ char totsizebuf[UINTMAX_STRSIZE_BOUND];
+ char s1buf[UINTMAX_STRSIZE_BOUND];
+ char s2buf[UINTMAX_STRSIZE_BOUND];
+
+ WARN ((0, 0, _("%s is the wrong size (%s != %s + %s)"),
+ quote (continued_file_name),
+ STRINGIFY_BIGINT (bufmap_head->sizetotal, totsizebuf),
+ STRINGIFY_BIGINT (continued_file_size, s1buf),
+ STRINGIFY_BIGINT (continued_file_offset, s2buf)));
+ return false;
+ }
+
+ if (bufmap_head->sizetotal - bufmap_head->sizeleft !=
+ continued_file_offset)
+ {
+ char totsizebuf[UINTMAX_STRSIZE_BOUND];
+ char s1buf[UINTMAX_STRSIZE_BOUND];
+ char s2buf[UINTMAX_STRSIZE_BOUND];
+
+ WARN ((0, 0, _("This volume is out of sequence (%s - %s != %s)"),
+ STRINGIFY_BIGINT (bufmap_head->sizetotal, totsizebuf),
+ STRINGIFY_BIGINT (bufmap_head->sizeleft, s1buf),
+ STRINGIFY_BIGINT (continued_file_offset, s2buf)));
+
+ return false;
+ }
+ }
+
+ increase_volume_number ();
+ return true;
+}
+
+\f
+#define VOLUME_TEXT " Volume "
+#define VOLUME_TEXT_LEN (sizeof VOLUME_TEXT - 1)
- if(archive<0) {
- msg_perror("can't open %s",ar_files[cur_ar_file]);
- goto tryagain;
+char *
+drop_volume_label_suffix (const char *label)
+{
+ const char *p;
+ size_t len = strlen (label);
+
+ if (len < 1)
+ return NULL;
+
+ for (p = label + len - 1; p > label && isdigit ((unsigned char) *p); p--)
+ ;
+ if (p > label && p - (VOLUME_TEXT_LEN - 1) > label)
+ {
+ p -= VOLUME_TEXT_LEN - 1;
+ if (memcmp (p, VOLUME_TEXT, VOLUME_TEXT_LEN) == 0)
+ {
+ char *s = xmalloc ((len = p - label) + 1);
+ memcpy (s, label, len);
+ s[len] = 0;
+ return s;
}
-#ifdef __MSDOS__
- setmode(archive,O_BINARY);
-#endif
- return 0;
+ }
+
+ return NULL;
}
-/* this is a useless function that takes a buffer returned by wantbytes
- and does nothing with it. If the function called by wantbytes returns
- an error indicator (non-zero), this function is called for the rest of
- the file.
- */
-int
-no_op(size,data)
-int size;
-char *data;
+/* Check LABEL against the volume label, seen as a globbing
+ pattern. Return true if the pattern matches. In case of failure,
+ retry matching a volume sequence number before giving up in
+ multi-volume mode. */
+static bool
+check_label_pattern (const char *label)
{
- return 0;
+ char *string;
+ bool result = false;
+
+ if (fnmatch (volume_label_option, label, 0) == 0)
+ return true;
+
+ if (!multi_volume_option)
+ return false;
+
+ string = drop_volume_label_suffix (label);
+ if (string)
+ {
+ result = fnmatch (string, volume_label_option, 0) == 0;
+ free (string);
+ }
+ return result;
}
-/* Some other routine wants SIZE bytes in the archive. For each chunk of
- the archive, call FUNC with the size of the chunk, and the address of
- the chunk it can work with.
- */
-int
-wantbytes(size,func)
-long size;
-int (*func)();
-{
- char *data;
- long data_size;
-
- while(size) {
- data = findrec()->charptr;
- if (data == NULL) { /* Check it... */
- msg("Unexpected EOF on archive file");
- return -1;
- }
- data_size = endofrecs()->charptr - data;
- if(data_size>size)
- data_size=size;
- if((*func)(data_size,data))
- func=no_op;
- userec((union record *)(data + data_size - 1));
- size-=data_size;
+/* Check if the next block contains a volume label and if this matches
+ the one given in the command line */
+static void
+match_volume_label (void)
+{
+ if (!volume_label)
+ {
+ union block *label = find_next_block ();
+
+ if (!label)
+ FATAL_ERROR ((0, 0, _("Archive not labeled to match %s"),
+ quote (volume_label_option)));
+ if (label->header.typeflag == GNUTYPE_VOLHDR)
+ {
+ if (memchr (label->header.name, '\0', sizeof label->header.name))
+ assign_string (&volume_label, label->header.name);
+ else
+ {
+ volume_label = xmalloc (sizeof (label->header.name) + 1);
+ memcpy (volume_label, label->header.name,
+ sizeof (label->header.name));
+ volume_label[sizeof (label->header.name)] = 0;
+ }
+ }
+ else if (label->header.typeflag == XGLTYPE)
+ {
+ struct tar_stat_info st;
+ tar_stat_init (&st);
+ xheader_read (&st.xhdr, label,
+ OFF_FROM_HEADER (label->header.size));
+ xheader_decode (&st);
+ tar_stat_destroy (&st);
}
- return 0;
+ }
+
+ if (!volume_label)
+ FATAL_ERROR ((0, 0, _("Archive not labeled to match %s"),
+ quote (volume_label_option)));
+
+ if (!check_label_pattern (volume_label))
+ FATAL_ERROR ((0, 0, _("Volume %s does not match %s"),
+ quote_n (0, volume_label),
+ quote_n (1, volume_label_option)));
+}
+
+/* Mark the archive with volume label STR. */
+static void
+_write_volume_label (const char *str)
+{
+ if (archive_format == POSIX_FORMAT)
+ xheader_store ("GNU.volume.label", &dummy, str);
+ else
+ {
+ union block *label = find_next_block ();
+
+ memset (label, 0, BLOCKSIZE);
+
+ strcpy (label->header.name, str);
+ assign_string (¤t_stat_info.file_name,
+ label->header.name);
+ current_stat_info.had_trailing_slash =
+ strip_trailing_slashes (current_stat_info.file_name);
+
+ label->header.typeflag = GNUTYPE_VOLHDR;
+ TIME_TO_CHARS (start_time.tv_sec, label->header.mtime);
+ finish_header (¤t_stat_info, label, -1);
+ set_next_block_after (label);
+ }
+}
+
+#define VOL_SUFFIX "Volume"
+
+/* Add a volume label to a part of multi-volume archive */
+static void
+add_volume_label (void)
+{
+ char buf[UINTMAX_STRSIZE_BOUND];
+ char *p = STRINGIFY_BIGINT (volno, buf);
+ char *s = xmalloc (strlen (volume_label_option) + sizeof VOL_SUFFIX
+ + strlen (p) + 2);
+ sprintf (s, "%s %s %s", volume_label_option, VOL_SUFFIX, p);
+ _write_volume_label (s);
+ free (s);
+}
+
+static void
+add_chunk_header (struct bufmap *map)
+{
+ if (archive_format == POSIX_FORMAT)
+ {
+ off_t block_ordinal;
+ union block *blk;
+ struct tar_stat_info st;
+
+ memset (&st, 0, sizeof st);
+ st.orig_file_name = st.file_name = map->file_name;
+ st.stat.st_mode = S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH;
+ st.stat.st_uid = getuid ();
+ st.stat.st_gid = getgid ();
+ st.orig_file_name = xheader_format_name (&st,
+ "%d/GNUFileParts.%p/%f.%n",
+ volno);
+ st.file_name = st.orig_file_name;
+ st.archive_file_size = st.stat.st_size = map->sizeleft;
+
+ block_ordinal = current_block_ordinal ();
+ blk = start_header (&st);
+ if (!blk)
+ abort (); /* FIXME */
+ finish_header (&st, blk, block_ordinal);
+ free (st.orig_file_name);
+ }
+}
+
+
+/* Add a volume label to the current archive */
+static void
+write_volume_label (void)
+{
+ if (multi_volume_option)
+ add_volume_label ();
+ else
+ _write_volume_label (volume_label_option);
+}
+
+/* Write GNU multi-volume header */
+static void
+gnu_add_multi_volume_header (struct bufmap *map)
+{
+ int tmp;
+ union block *block = find_next_block ();
+
+ if (strlen (map->file_name) > NAME_FIELD_SIZE)
+ WARN ((0, 0,
+ _("%s: file name too long to be stored in a GNU multivolume header, truncated"),
+ quotearg_colon (map->file_name)));
+
+ memset (block, 0, BLOCKSIZE);
+
+ strncpy (block->header.name, map->file_name, NAME_FIELD_SIZE);
+ block->header.typeflag = GNUTYPE_MULTIVOL;
+
+ OFF_TO_CHARS (map->sizeleft, block->header.size);
+ OFF_TO_CHARS (map->sizetotal - map->sizeleft,
+ block->oldgnu_header.offset);
+
+ tmp = verbose_option;
+ verbose_option = 0;
+ finish_header (¤t_stat_info, block, -1);
+ verbose_option = tmp;
+ set_next_block_after (block);
+}
+
+/* Add a multi volume header to the current archive. The exact header format
+ depends on the archive format. */
+static void
+add_multi_volume_header (struct bufmap *map)
+{
+ if (archive_format == POSIX_FORMAT)
+ {
+ off_t d = map->sizetotal - map->sizeleft;
+ xheader_store ("GNU.volume.filename", &dummy, map->file_name);
+ xheader_store ("GNU.volume.size", &dummy, &map->sizeleft);
+ xheader_store ("GNU.volume.offset", &dummy, &d);
+ }
+ else
+ gnu_add_multi_volume_header (map);
+}
+
+\f
+/* Low-level flush functions */
+
+/* Simple flush read (no multi-volume or label extensions) */
+static void
+simple_flush_read (void)
+{
+ size_t status; /* result from system call */
+
+ checkpoint_run (false);
+
+ /* Clear the count of errors. This only applies to a single call to
+ flush_read. */
+
+ read_error_count = 0; /* clear error count */
+
+ if (write_archive_to_stdout && record_start_block != 0)
+ {
+ archive = STDOUT_FILENO;
+ status = sys_write_archive_buffer ();
+ archive = STDIN_FILENO;
+ if (status != record_size)
+ archive_write_error (status);
+ }
+
+ for (;;)
+ {
+ status = rmtread (archive, record_start->buffer, record_size);
+ if (status == record_size)
+ {
+ records_read++;
+ return;
+ }
+ if (status == SAFE_READ_ERROR)
+ {
+ archive_read_error ();
+ continue; /* try again */
+ }
+ break;
+ }
+ short_read (status);
+}
+
+/* Simple flush write (no multi-volume or label extensions) */
+static void
+simple_flush_write (size_t level __attribute__((unused)))
+{
+ ssize_t status;
+
+ status = _flush_write ();
+ if (status != record_size)
+ archive_write_error (status);
+ else
+ {
+ records_written++;
+ bytes_written += status;
+ }
+}
+
+\f
+/* GNU flush functions. These support multi-volume and archive labels in
+ GNU and PAX archive formats. */
+
+static void
+_gnu_flush_read (void)
+{
+ size_t status; /* result from system call */
+
+ checkpoint_run (false);
+
+ /* Clear the count of errors. This only applies to a single call to
+ flush_read. */
+
+ read_error_count = 0; /* clear error count */
+
+ if (write_archive_to_stdout && record_start_block != 0)
+ {
+ archive = STDOUT_FILENO;
+ status = sys_write_archive_buffer ();
+ archive = STDIN_FILENO;
+ if (status != record_size)
+ archive_write_error (status);
+ }
+
+ for (;;)
+ {
+ status = rmtread (archive, record_start->buffer, record_size);
+ if (status == record_size)
+ {
+ records_read++;
+ return;
+ }
+
+ /* The condition below used to include
+ || (status > 0 && !read_full_records)
+ This is incorrect since even if new_volume() succeeds, the
+ subsequent call to rmtread will overwrite the chunk of data
+ already read in the buffer, so the processing will fail */
+ if ((status == 0
+ || (status == SAFE_READ_ERROR && errno == ENOSPC))
+ && multi_volume_option)
+ {
+ while (!try_new_volume ())
+ ;
+ if (current_block == record_end)
+ /* Necessary for blocking_factor == 1 */
+ flush_archive();
+ return;
+ }
+ else if (status == SAFE_READ_ERROR)
+ {
+ archive_read_error ();
+ continue;
+ }
+ break;
+ }
+ short_read (status);
+}
+
+static void
+gnu_flush_read (void)
+{
+ flush_read_ptr = simple_flush_read; /* Avoid recursion */
+ _gnu_flush_read ();
+ flush_read_ptr = gnu_flush_read;
+}
+
+static void
+_gnu_flush_write (size_t buffer_level)
+{
+ ssize_t status;
+ union block *header;
+ char *copy_ptr;
+ size_t copy_size;
+ size_t bufsize;
+ struct bufmap *map;
+
+ status = _flush_write ();
+ if (status != record_size && !multi_volume_option)
+ archive_write_error (status);
+ else
+ {
+ if (status)
+ records_written++;
+ bytes_written += status;
+ }
+
+ if (status == record_size)
+ {
+ return;
+ }
+
+ map = bufmap_locate (status);
+
+ if (status % BLOCKSIZE)
+ {
+ ERROR ((0, 0, _("write did not end on a block boundary")));
+ archive_write_error (status);
+ }
+
+ /* In multi-volume mode. */
+ /* ENXIO is for the UNIX PC. */
+ if (status < 0 && errno != ENOSPC && errno != EIO && errno != ENXIO)
+ archive_write_error (status);
+
+ if (!new_volume (ACCESS_WRITE))
+ return;
+
+ tar_stat_destroy (&dummy);
+
+ increase_volume_number ();
+ prev_written += bytes_written;
+ bytes_written = 0;
+
+ copy_ptr = record_start->buffer + status;
+ copy_size = buffer_level - status;
+
+ /* Switch to the next buffer */
+ record_index = !record_index;
+ init_buffer ();
+
+ inhibit_map = 1;
+
+ if (volume_label_option)
+ add_volume_label ();
+
+ if (map)
+ add_multi_volume_header (map);
+
+ write_extended (true, &dummy, find_next_block ());
+ tar_stat_destroy (&dummy);
+
+ if (map)
+ add_chunk_header (map);
+ header = find_next_block ();
+ bufmap_reset (map, header - record_start);
+ bufsize = available_space_after (header);
+ inhibit_map = 0;
+ while (bufsize < copy_size)
+ {
+ memcpy (header->buffer, copy_ptr, bufsize);
+ copy_ptr += bufsize;
+ copy_size -= bufsize;
+ set_next_block_after (header + (bufsize - 1) / BLOCKSIZE);
+ header = find_next_block ();
+ bufsize = available_space_after (header);
+ }
+ memcpy (header->buffer, copy_ptr, copy_size);
+ memset (header->buffer + copy_size, 0, bufsize - copy_size);
+ set_next_block_after (header + (copy_size - 1) / BLOCKSIZE);
+ find_next_block ();
+}
+
+static void
+gnu_flush_write (size_t buffer_level)
+{
+ flush_write_ptr = simple_flush_write; /* Avoid recursion */
+ _gnu_flush_write (buffer_level);
+ flush_write_ptr = gnu_flush_write;
+}
+
+void
+flush_read (void)
+{
+ flush_read_ptr ();
+}
+
+void
+flush_write (void)
+{
+ flush_write_ptr (record_size);
+}
+
+void
+open_archive (enum access_mode wanted_access)
+{
+ flush_read_ptr = gnu_flush_read;
+ flush_write_ptr = gnu_flush_write;
+
+ _open_archive (wanted_access);
+ switch (wanted_access)
+ {
+ case ACCESS_READ:
+ case ACCESS_UPDATE:
+ if (volume_label_option)
+ match_volume_label ();
+ break;
+
+ case ACCESS_WRITE:
+ records_written = 0;
+ if (volume_label_option)
+ write_volume_label ();
+ break;
+ }
+ set_volume_start_time ();
}
projects / chaz / tar / blobdiff