/* Extract files from a tar archive.
- Copyright (C) 1988, 1992 Free Software Foundation
-This file is part of GNU Tar.
+ Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
+ 2001, 2003, 2004 Free Software Foundation, Inc.
-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.
+ Written by John Gilmore, on 1985-11-19.
-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.
+ This program 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.
-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. */
+ This program 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.
-/*
- * Extract files from a tar archive.
- *
- * Written 19 Nov 1985 by John Gilmore, ihnp4!hoptoad!gnu.
- */
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#include <stdio.h>
+#include <system.h>
+#include <quotearg.h>
#include <errno.h>
-#ifndef STDC_HEADERS
-extern int errno;
-#endif
-#include <sys/types.h>
-#include <time.h>
-time_t time ();
+#include <xgetcwd.h>
-#ifdef BSD42
-#include <sys/file.h>
+#if HAVE_UTIME_H
+# include <utime.h>
#else
-#ifndef V7
-#include <fcntl.h>
-#endif
-#endif
-
-#ifdef NO_OPEN3
-/* We need the #define's even though we don't use them. */
-#include "open3.h"
+struct utimbuf
+ {
+ long actime;
+ long modtime;
+ };
#endif
-#ifdef EMUL_OPEN3
-/* Simulated 3-argument open for systems that don't have it */
-#include "open3.h"
-#endif
+#include "common.h"
-#include "tar.h"
-#include "port.h"
+static bool we_are_root; /* true if our effective uid == 0 */
+static mode_t newdir_umask; /* umask when creating new directories */
+static mode_t current_umask; /* current umask (which is set to 0 if -p) */
-#if defined(_POSIX_VERSION)
-#include <utime.h>
-#else
-struct utimbuf
+/* Status of the permissions of a file that we are extracting. */
+enum permstatus
{
- long actime;
- long modtime;
+ /* This file may have existed already; its permissions are unknown. */
+ UNKNOWN_PERMSTATUS,
+
+ /* This file was created using the permissions from the archive. */
+ ARCHIVED_PERMSTATUS,
+
+ /* This is an intermediate directory; the archive did not specify
+ its permissions. */
+ INTERDIR_PERMSTATUS
};
-#endif
+/* List of directories whose statuses we need to extract after we've
+ finished extracting their subsidiary files. If you consider each
+ contiguous subsequence of elements of the form [D]?[^D]*, where [D]
+ represents an element where AFTER_SYMLINKS is nonzero and [^D]
+ represents an element where AFTER_SYMLINKS is zero, then the head
+ of the subsequence has the longest name, and each non-head element
+ in the prefix is an ancestor (in the directory hierarchy) of the
+ preceding element. */
+
+struct delayed_set_stat
+ {
+ struct delayed_set_stat *next;
+ struct stat stat_info;
+ size_t file_name_len;
+ mode_t invert_permissions;
+ enum permstatus permstatus;
+ bool after_symlinks;
+ char file_name[1];
+ };
+
+static struct delayed_set_stat *delayed_set_stat_head;
+
+/* List of symbolic links whose creation we have delayed. */
+struct delayed_symlink
+ {
+ /* The next delayed symbolic link in the list. */
+ struct delayed_symlink *next;
+
+ /* The device, inode number and last-modified time of the placeholder. */
+ dev_t dev;
+ ino_t ino;
+ time_t mtime;
+
+ /* The desired owner and group of the symbolic link. */
+ uid_t uid;
+ gid_t gid;
+
+ /* A list of sources for this symlink. The sources are all to be
+ hard-linked together. */
+ struct string_list *sources;
+
+ /* The desired target of the desired link. */
+ char target[1];
+ };
+
+static struct delayed_symlink *delayed_symlink_head;
+
+struct string_list
+ {
+ struct string_list *next;
+ char string[1];
+ };
+
+/* Set up to extract files. */
+void
+extr_init (void)
+{
+ we_are_root = geteuid () == 0;
+ same_permissions_option += we_are_root;
+ same_owner_option += we_are_root;
-extern FILE *msg_file;
+ /* Save 'root device' to avoid purging mount points.
+ FIXME: Should the same be done after handling -C option ? */
+ if (one_file_system_option)
+ {
+ struct stat st;
+ char *dir = xgetcwd ();
-extern union record *head; /* Points to current tape header */
-extern struct stat hstat; /* Stat struct corresponding */
-extern int head_standard; /* Tape header is in ANSI format */
+ if (deref_stat (true, dir, &st))
+ stat_diag (dir);
+ else
+ root_device = st.st_dev;
+ }
-extern char *save_name;
-extern long save_totsize;
-extern long save_sizeleft;
+ /* Option -p clears the kernel umask, so it does not affect proper
+ restoration of file permissions. New intermediate directories will
+ comply with umask at start of program. */
-int confirm ();
-void decode_header ();
-void extract_mangle ();
-void extract_sparse_file ();
-long from_oct ();
-void gnu_restore ();
-extern void print_header ();
-extern void skip_file ();
-extern void skip_extended_headers ();
-extern void pr_mkdir ();
-void saverec ();
+ newdir_umask = umask (0);
+ if (0 < same_permissions_option)
+ current_umask = 0;
+ else
+ {
+ umask (newdir_umask); /* restore the kernel umask */
+ current_umask = newdir_umask;
+ }
+}
-int make_dirs (); /* Makes required directories */
+/* If restoring permissions, restore the mode for FILE_NAME from
+ information given in *STAT_INFO (where *CUR_INFO gives
+ the current status if CUR_INFO is nonzero); otherwise invert the
+ INVERT_PERMISSIONS bits from the file's current permissions.
+ PERMSTATUS specifies the status of the file's permissions.
+ TYPEFLAG specifies the type of the file. */
+static void
+set_mode (char const *file_name,
+ struct stat const *stat_info,
+ struct stat const *cur_info,
+ mode_t invert_permissions, enum permstatus permstatus,
+ char typeflag)
+{
+ mode_t mode;
-static time_t now = 0; /* Current time */
-static we_are_root = 0; /* True if our effective uid == 0 */
-static int notumask = ~0; /* Masks out bits user doesn't want */
+ if (0 < same_permissions_option
+ && permstatus != INTERDIR_PERMSTATUS)
+ {
+ mode = stat_info->st_mode;
+
+ /* If we created the file and it has a usual mode, then its mode
+ is normally set correctly already. But on many hosts, some
+ directories inherit the setgid bits from their parents, so we
+ we must set directories' modes explicitly. */
+ if (permstatus == ARCHIVED_PERMSTATUS
+ && ! (mode & ~ MODE_RWX)
+ && typeflag != DIRTYPE
+ && typeflag != GNUTYPE_DUMPDIR)
+ return;
+ }
+ else if (! invert_permissions)
+ return;
+ else
+ {
+ /* We must inspect a directory's current permissions, since the
+ directory may have inherited its setgid bit from its parent.
+
+ INVERT_PERMISSIONS happens to be nonzero only for directories
+ that we created, so there's no point optimizing this code for
+ other cases. */
+ struct stat st;
+ if (! cur_info)
+ {
+ if (stat (file_name, &st) != 0)
+ {
+ stat_error (file_name);
+ return;
+ }
+ cur_info = &st;
+ }
+ mode = cur_info->st_mode ^ invert_permissions;
+ }
-/*
- * "Scratch" space to store the information about a sparse file before
- * writing the info into the header or extended header
- */
-/*struct sp_array *sparsearray;*/
+ if (chmod (file_name, mode) != 0)
+ chmod_error_details (file_name, mode);
+}
-/* number of elts storable in the sparsearray */
-/*int sp_array_size = 10;*/
+/* Check time after successfully setting FILE_NAME's time stamp to T. */
+static void
+check_time (char const *file_name, time_t t)
+{
+ time_t now;
+ if (t <= 0)
+ WARN ((0, 0, _("%s: implausibly old time stamp %s"),
+ file_name, tartime (t)));
+ else if (start_time < t && (now = time (0)) < t)
+ WARN ((0, 0, _("%s: time stamp %s is %lu s in the future"),
+ file_name, tartime (t), (unsigned long) (t - now)));
+}
-struct saved_dir_info
+/* Restore stat attributes (owner, group, mode and times) for
+ FILE_NAME, using information given in *STAT_INFO.
+ If CUR_INFO is nonzero, *CUR_INFO is the
+ file's currernt status.
+ If not restoring permissions, invert the
+ INVERT_PERMISSIONS bits from the file's current permissions.
+ PERMSTATUS specifies the status of the file's permissions.
+ TYPEFLAG specifies the type of the file. */
+
+/* FIXME: About proper restoration of symbolic link attributes, we still do
+ not have it right. Pretesters' reports tell us we need further study and
+ probably more configuration. For now, just use lchown if it exists, and
+ punt for the rest. Sigh! */
+
+static void
+set_stat (char const *file_name,
+ struct stat const *stat_info,
+ struct stat const *cur_info,
+ mode_t invert_permissions, enum permstatus permstatus,
+ char typeflag)
{
- char *path;
- int mode;
- int atime;
- int mtime;
- struct saved_dir_info *next;
-};
+ struct utimbuf utimbuf;
-struct saved_dir_info *saved_dir_info_head;
+ if (typeflag != SYMTYPE)
+ {
+ /* We do the utime before the chmod because some versions of utime are
+ broken and trash the modes of the file. */
-/*
- * Set up to extract files.
- */
-void
-extr_init ()
-{
- int ourmask;
-
- now = time ((time_t *) 0);
- if (geteuid () == 0)
- we_are_root = 1;
-
- /*
- * We need to know our umask. But if f_use_protection is set,
- * leave our kernel umask at 0, and our "notumask" at ~0.
- */
- ourmask = umask (0); /* Read it */
- if (!f_use_protection)
+ if (! touch_option && permstatus != INTERDIR_PERMSTATUS)
+ {
+ /* We set the accessed time to `now', which is really the time we
+ started extracting files, unless incremental_option is used, in
+ which case .st_atime is used. */
+
+ /* FIXME: incremental_option should set ctime too, but how? */
+
+ if (incremental_option)
+ utimbuf.actime = stat_info->st_atime;
+ else
+ utimbuf.actime = start_time;
+
+ utimbuf.modtime = stat_info->st_mtime;
+
+ if (utime (file_name, &utimbuf) < 0)
+ utime_error (file_name);
+ else
+ {
+ check_time (file_name, utimbuf.actime);
+ check_time (file_name, utimbuf.modtime);
+ }
+ }
+
+ /* Some systems allow non-root users to give files away. Once this
+ done, it is not possible anymore to change file permissions, so we
+ have to set permissions prior to possibly giving files away. */
+
+ set_mode (file_name, stat_info, cur_info,
+ invert_permissions, permstatus, typeflag);
+ }
+
+ if (0 < same_owner_option && permstatus != INTERDIR_PERMSTATUS)
{
- (void) umask (ourmask); /* Set it back how it was */
- notumask = ~ourmask; /* Make umask override permissions */
+ /* When lchown exists, it should be used to change the attributes of
+ the symbolic link itself. In this case, a mere chown would change
+ the attributes of the file the symbolic link is pointing to, and
+ should be avoided. */
+
+ if (typeflag == SYMTYPE)
+ {
+#if HAVE_LCHOWN
+ if (lchown (file_name, stat_info->st_uid, stat_info->st_gid) < 0)
+ chown_error_details (file_name,
+ stat_info->st_uid, stat_info->st_gid);
+#endif
+ }
+ else
+ {
+ if (chown (file_name, stat_info->st_uid, stat_info->st_gid) < 0)
+ chown_error_details (file_name,
+ stat_info->st_uid, stat_info->st_gid);
+
+ /* On a few systems, and in particular, those allowing to give files
+ away, changing the owner or group destroys the suid or sgid bits.
+ So let's attempt setting these bits once more. */
+ if (stat_info->st_mode & (S_ISUID | S_ISGID | S_ISVTX))
+ set_mode (file_name, stat_info, 0,
+ invert_permissions, permstatus, typeflag);
+ }
}
}
+/* Remember to restore stat attributes (owner, group, mode and times)
+ for the directory FILE_NAME, using information given in *STAT_INFO,
+ once we stop extracting files into that directory.
+ If not restoring permissions, remember to invert the
+ INVERT_PERMISSIONS bits from the file's current permissions.
+ PERMSTATUS specifies the status of the file's permissions. */
+static void
+delay_set_stat (char const *file_name, struct stat const *stat_info,
+ mode_t invert_permissions, enum permstatus permstatus)
+{
+ size_t file_name_len = strlen (file_name);
+ struct delayed_set_stat *data =
+ xmalloc (offsetof (struct delayed_set_stat, file_name)
+ + file_name_len + 1);
+ data->file_name_len = file_name_len;
+ strcpy (data->file_name, file_name);
+ data->invert_permissions = invert_permissions;
+ data->permstatus = permstatus;
+ data->after_symlinks = 0;
+ data->stat_info = *stat_info;
+ data->next = delayed_set_stat_head;
+ delayed_set_stat_head = data;
+}
-/*
- * Extract a file from the archive.
- */
-void
-extract_archive ()
+/* Update the delayed_set_stat info for an intermediate directory
+ created within the file name of DIR. The intermediate directory turned
+ out to be the same as this directory, e.g. due to ".." or symbolic
+ links. *DIR_STAT_INFO is the status of the directory. */
+static void
+repair_delayed_set_stat (char const *dir,
+ struct stat const *dir_stat_info)
{
- register char *data;
- int fd, check, namelen, written, openflag;
- long size;
- struct utimbuf acc_upd_times;
- register int skipcrud;
- register int i;
- /* int sparse_ind = 0;*/
- union record *exhdr;
- struct saved_dir_info *tmp;
- /* int end_nulls; */
-
- saverec (&head); /* Make sure it sticks around */
- userec (head); /* And go past it in the archive */
- decode_header (head, &hstat, &head_standard, 1); /* Snarf fields */
-
- if (f_confirm && !confirm ("extract", current_file_name))
+ struct delayed_set_stat *data;
+ for (data = delayed_set_stat_head; data; data = data->next)
{
- if (head->header.isextended)
- skip_extended_headers ();
- skip_file ((long) hstat.st_size);
- saverec ((union record **) 0);
- return;
+ struct stat st;
+ if (stat (data->file_name, &st) != 0)
+ {
+ stat_error (data->file_name);
+ return;
+ }
+
+ if (st.st_dev == dir_stat_info->st_dev
+ && st.st_ino == dir_stat_info->st_ino)
+ {
+ data->stat_info = current_stat_info.stat;
+ data->invert_permissions =
+ (MODE_RWX & (current_stat_info.stat.st_mode ^ st.st_mode));
+ data->permstatus = ARCHIVED_PERMSTATUS;
+ return;
+ }
}
- /* Print the record from 'head' and 'hstat' */
- if (f_verbose)
- print_header ();
-
- /*
- * Check for fully specified pathnames and other atrocities.
- *
- * Note, we can't just make a pointer to the new file name,
- * since saverec() might move the header and adjust "head".
- * We have to start from "head" every time we want to touch
- * the header record.
- */
- skipcrud = 0;
- while (!f_absolute_paths
- && '/' == current_file_name[skipcrud])
+ ERROR ((0, 0, _("%s: Unexpected inconsistency when making directory"),
+ quotearg_colon (dir)));
+}
+
+/* After a file/link/symlink/directory creation has failed, see if
+ it's because some required directory was not present, and if so,
+ create all required directories. Return non-zero if a directory
+ was created. */
+static int
+make_directories (char *file_name)
+{
+ char *cursor0 = file_name + FILE_SYSTEM_PREFIX_LEN (file_name);
+ char *cursor; /* points into the file name */
+ int did_something = 0; /* did we do anything yet? */
+ int mode;
+ int invert_permissions;
+ int status;
+
+
+ for (cursor = cursor0; *cursor; cursor++)
{
- static int warned_once = 0;
+ if (! ISSLASH (*cursor))
+ continue;
+
+ /* Avoid mkdir of empty string, if leading or double '/'. */
+
+ if (cursor == cursor0 || ISSLASH (cursor[-1]))
+ continue;
+
+ /* Avoid mkdir where last part of file name is "." or "..". */
+
+ if (cursor[-1] == '.'
+ && (cursor == cursor0 + 1 || ISSLASH (cursor[-2])
+ || (cursor[-2] == '.'
+ && (cursor == cursor0 + 2 || ISSLASH (cursor[-3])))))
+ continue;
+
+ *cursor = '\0'; /* truncate the name there */
+ mode = MODE_RWX & ~ newdir_umask;
+ invert_permissions = we_are_root ? 0 : MODE_WXUSR & ~ mode;
+ status = mkdir (file_name, mode ^ invert_permissions);
- skipcrud++; /* Force relative path */
- if (!warned_once++)
+ if (status == 0)
{
- msg ("Removing leading / from absolute path names in the archive.");
+ /* Create a struct delayed_set_stat even if
+ invert_permissions is zero, because
+ repair_delayed_set_stat may need to update the struct. */
+ delay_set_stat (file_name,
+ ¤t_stat_info.stat /* ignored */,
+ invert_permissions, INTERDIR_PERMSTATUS);
+
+ print_for_mkdir (file_name, cursor - file_name, mode);
+ did_something = 1;
+
+ *cursor = '/';
+ continue;
}
+
+ *cursor = '/';
+
+ if (errno == EEXIST)
+ continue; /* Directory already exists. */
+ else if ((errno == ENOSYS /* Automounted dirs on Solaris return
+ this. Reported by Warren Hyde
+ <Warren.Hyde@motorola.com> */
+ || ERRNO_IS_EACCES) /* Turbo C mkdir gives a funny errno. */
+ && access (file_name, W_OK) == 0)
+ continue;
+
+ /* Some other error in the mkdir. We return to the caller. */
+ break;
}
- switch (head->header.linkflag)
+ return did_something; /* tell them to retry if we made one */
+}
+
+static bool
+file_newer_p (const char *file_name, struct tar_stat_info *tar_stat)
+{
+ struct stat st;
+
+ if (stat (file_name, &st))
{
+ stat_warn (file_name);
+ /* Be on the safe side: if the file does exist assume it is newer */
+ return errno != ENOENT;
+ }
+ if (!S_ISDIR (st.st_mode)
+ && st.st_mtime >= tar_stat->stat.st_mtime)
+ {
+ return true;
+ }
+ return false;
+}
- default:
- msg ("Unknown file type '%c' for %s, extracted as normal file",
- head->header.linkflag, skipcrud + current_file_name);
- /* FALL THRU */
-
- /*
- * JK - What we want to do if the file is sparse is loop through
- * the array of sparse structures in the header and read in
- * and translate the character strings representing 1) the offset
- * at which to write and 2) how many bytes to write into numbers,
- * which we store into the scratch array, "sparsearray". This
- * array makes our life easier the same way it did in creating
- * the tar file that had to deal with a sparse file.
- *
- * After we read in the first five (at most) sparse structures,
- * we check to see if the file has an extended header, i.e.,
- * if more sparse structures are needed to describe the contents
- * of the new file. If so, we read in the extended headers
- * and continue to store their contents into the sparsearray.
- */
- case LF_SPARSE:
- sp_array_size = 10;
- sparsearray = (struct sp_array *) malloc (sp_array_size * sizeof (struct sp_array));
- for (i = 0; i < SPARSE_IN_HDR; i++)
+/* Attempt repairing what went wrong with the extraction. Delete an
+ already existing file or create missing intermediate directories.
+ Return nonzero if we somewhat increased our chances at a successful
+ extraction. errno is properly restored on zero return. */
+static int
+maybe_recoverable (char *file_name, int *interdir_made)
+{
+ int e = errno;
+
+ if (*interdir_made)
+ return 0;
+
+ switch (errno)
+ {
+ case EEXIST:
+ /* Remove an old file, if the options allow this. */
+
+ switch (old_files_option)
{
- sparsearray[i].offset =
- from_oct (1 + 12, head->header.sp[i].offset);
- sparsearray[i].numbytes =
- from_oct (1 + 12, head->header.sp[i].numbytes);
- if (!sparsearray[i].numbytes)
- break;
- }
+ case KEEP_OLD_FILES:
+ return 0;
+
+ case KEEP_NEWER_FILES:
+ if (file_newer_p (file_name, ¤t_stat_info))
+ {
+ errno = e;
+ return 0;
+ }
+ /* FALL THROUGH */
+
+ case DEFAULT_OLD_FILES:
+ case NO_OVERWRITE_DIR_OLD_FILES:
+ case OVERWRITE_OLD_FILES:
+ {
+ int r = remove_any_file (file_name, ORDINARY_REMOVE_OPTION);
+ errno = EEXIST;
+ return r;
+ }
- /* end_nulls = from_oct(1+12, head->header.ending_blanks);*/
+ case UNLINK_FIRST_OLD_FILES:
+ break;
+ }
- if (head->header.isextended)
+ case ENOENT:
+ /* Attempt creating missing intermediate directories. */
+ if (! make_directories (file_name))
{
- /* read in the list of extended headers
- and translate them into the sparsearray
- as before */
+ errno = ENOENT;
+ return 0;
+ }
+ *interdir_made = 1;
+ return 1;
+
+ default:
+ /* Just say we can't do anything about it... */
+
+ return 0;
+ }
+}
+
+/* Fix the statuses of all directories whose statuses need fixing, and
+ which are not ancestors of FILE_NAME. If AFTER_SYMLINKS is
+ nonzero, do this for all such directories; otherwise, stop at the
+ first directory that is marked to be fixed up only after delayed
+ symlinks are applied. */
+static void
+apply_nonancestor_delayed_set_stat (char const *file_name, bool after_symlinks)
+{
+ size_t file_name_len = strlen (file_name);
+ bool check_for_renamed_directories = 0;
- /* static */ int ind = SPARSE_IN_HDR;
+ while (delayed_set_stat_head)
+ {
+ struct delayed_set_stat *data = delayed_set_stat_head;
+ bool skip_this_one = 0;
+ struct stat st;
+ struct stat const *cur_info = 0;
+
+ check_for_renamed_directories |= data->after_symlinks;
+
+ if (after_symlinks < data->after_symlinks
+ || (data->file_name_len < file_name_len
+ && file_name[data->file_name_len]
+ && (ISSLASH (file_name[data->file_name_len])
+ || ISSLASH (file_name[data->file_name_len - 1]))
+ && memcmp (file_name, data->file_name, data->file_name_len) == 0))
+ break;
- for (;;)
+ if (check_for_renamed_directories)
+ {
+ cur_info = &st;
+ if (stat (data->file_name, &st) != 0)
+ {
+ stat_error (data->file_name);
+ skip_this_one = 1;
+ }
+ else if (! (st.st_dev == data->stat_info.st_dev
+ && (st.st_ino == data->stat_info.st_ino)))
{
+ ERROR ((0, 0,
+ _("%s: Directory renamed before its status could be extracted"),
+ quotearg_colon (data->file_name)));
+ skip_this_one = 1;
+ }
+ }
- exhdr = findrec ();
- for (i = 0; i < SPARSE_EXT_HDR; i++)
- {
+ if (! skip_this_one)
+ set_stat (data->file_name, &data->stat_info, cur_info,
+ data->invert_permissions, data->permstatus, DIRTYPE);
- if (i + ind > sp_array_size - 1)
- {
- /*
- * realloc the scratch area
- * since we've run out of room --
- */
- sparsearray = (struct sp_array *)
- realloc (sparsearray,
- 2 * sp_array_size * (sizeof (struct sp_array)));
- sp_array_size *= 2;
- }
- if (!exhdr->ext_hdr.sp[i].numbytes)
- break;
- sparsearray[i + ind].offset =
- from_oct (1 + 12, exhdr->ext_hdr.sp[i].offset);
- sparsearray[i + ind].numbytes =
- from_oct (1 + 12, exhdr->ext_hdr.sp[i].numbytes);
+ delayed_set_stat_head = data->next;
+ free (data);
+ }
+}
+
+\f
+
+/* Extractor functions for various member types */
+
+static int
+extract_dir (char *file_name, int typeflag)
+{
+ int status;
+ mode_t mode;
+ int interdir_made = 0;
+
+ if (incremental_option)
+ /* Read the entry and delete files that aren't listed in the archive. */
+ purge_directory (file_name);
+ else if (typeflag == GNUTYPE_DUMPDIR)
+ skip_member ();
+
+ mode = (current_stat_info.stat.st_mode | (we_are_root ? 0 : MODE_WXUSR)) & MODE_RWX;
+
+ while ((status = mkdir (file_name, mode)))
+ {
+ if (errno == EEXIST
+ && (interdir_made
+ || old_files_option == DEFAULT_OLD_FILES
+ || old_files_option == OVERWRITE_OLD_FILES))
+ {
+ struct stat st;
+ if (stat (file_name, &st) == 0)
+ {
+ if (interdir_made)
+ {
+ repair_delayed_set_stat (file_name, &st);
+ return 0;
}
- if (!exhdr->ext_hdr.isextended)
- break;
- else
+ if (S_ISDIR (st.st_mode))
{
- ind += SPARSE_EXT_HDR;
- userec (exhdr);
+ mode = st.st_mode & ~ current_umask;
+ break;
}
}
- userec (exhdr);
+ errno = EEXIST;
}
- /* FALL THRU */
- case LF_OLDNORMAL:
- case LF_NORMAL:
- case LF_CONTIG:
- /*
- * Appears to be a file.
- * See if it's really a directory.
- */
- namelen = strlen (skipcrud + current_file_name) - 1;
- if (current_file_name[skipcrud + namelen] == '/')
- goto really_dir;
-
- /* FIXME, deal with protection issues */
- again_file:
- openflag = (f_keep ?
- O_BINARY | O_NDELAY | O_WRONLY | O_CREAT | O_EXCL :
- O_BINARY | O_NDELAY | O_WRONLY | O_CREAT | O_TRUNC)
- | ((head->header.linkflag == LF_SPARSE) ? 0 : O_APPEND);
- /*
- * JK - The last | is a kludge to solve the problem
- * the O_APPEND flag causes with files we are
- * trying to make sparse: when a file is opened
- * with O_APPEND, it writes to the last place
- * that something was written, thereby ignoring
- * any lseeks that we have done. We add this
- * extra condition to make it able to lseek when
- * a file is sparse, i.e., we don't open the new
- * file with this flag. (Grump -- this bug caused
- * me to waste a good deal of time, I might add)
- */
-
- if (f_exstdout)
+ if (maybe_recoverable (file_name, &interdir_made))
+ continue;
+
+ if (errno != EEXIST)
{
- fd = 1;
- goto extract_file;
+ mkdir_error (file_name);
+ return 1;
}
-#ifdef O_CTG
- /*
- * Contiguous files (on the Masscomp) have to specify
- * the size in the open call that creates them.
- */
- if (head->header.linkflag == LF_CONTIG)
- fd = open ((longname ? longname : head->header.name)
- + skipcrud,
- openflag | O_CTG,
- hstat.st_mode, hstat.st_size);
- else
-#endif
+ break;
+ }
+
+ if (status == 0
+ || old_files_option == DEFAULT_OLD_FILES
+ || old_files_option == OVERWRITE_OLD_FILES)
+ delay_set_stat (file_name, ¤t_stat_info.stat,
+ MODE_RWX & (mode ^ current_stat_info.stat.st_mode),
+ (status == 0
+ ? ARCHIVED_PERMSTATUS
+ : UNKNOWN_PERMSTATUS));
+
+ return status;
+}
+
+
+static int
+open_output_file (char *file_name, int typeflag)
+{
+ int fd;
+ int openflag = (O_WRONLY | O_BINARY | O_CREAT
+ | (old_files_option == OVERWRITE_OLD_FILES
+ ? O_TRUNC
+ : O_EXCL));
+ mode_t mode = current_stat_info.stat.st_mode & MODE_RWX & ~ current_umask;
+
+#if O_CTG
+ /* Contiguous files (on the Masscomp) have to specify the size in
+ the open call that creates them. */
+
+ if (typeflag == CONTTYPE)
+ fd = open (file_name, openflag | O_CTG, mode, current_stat_info.stat.st_size);
+ else
+ fd = open (file_name, openflag, mode);
+
+#else /* not O_CTG */
+ if (typeflag == CONTTYPE)
+ {
+ static int conttype_diagnosed;
+
+ if (!conttype_diagnosed)
{
-#ifdef NO_OPEN3
- /*
- * On raw V7 we won't let them specify -k (f_keep), but
- * we just bull ahead and create the files.
- */
- fd = creat ((longname
- ? longname
- : head->header.name) + skipcrud,
- hstat.st_mode);
-#else
- /*
- * With 3-arg open(), we can do this up right.
- */
- fd = open (skipcrud + current_file_name,
- openflag, hstat.st_mode);
-#endif
+ conttype_diagnosed = 1;
+ WARN ((0, 0, _("Extracting contiguous files as regular files")));
}
+ }
+ fd = open (file_name, openflag, mode);
+#endif /* not O_CTG */
+
+ return fd;
+}
+
+static int
+extract_file (char *file_name, int typeflag)
+{
+ int fd;
+ off_t size;
+ union block *data_block;
+ int status;
+ size_t count;
+ size_t written;
+ int interdir_made = 0;
+
+ /* FIXME: deal with protection issues. */
+
+ if (to_stdout_option)
+ fd = STDOUT_FILENO;
+ else if (to_command_option)
+ {
+ fd = sys_exec_command (file_name, 'f', ¤t_stat_info);
if (fd < 0)
{
- if (make_dirs (skipcrud + current_file_name))
- goto again_file;
- msg_perror ("Could not create file %s",
- skipcrud + current_file_name);
- if (head->header.isextended)
- skip_extended_headers ();
- skip_file ((long) hstat.st_size);
- goto quit;
+ skip_member ();
+ return 0;
}
+ }
+ else
+ {
+ do
+ fd = open_output_file (file_name, typeflag);
+ while (fd < 0 && maybe_recoverable (file_name, &interdir_made));
- extract_file:
- if (head->header.linkflag == LF_SPARSE)
+ if (fd < 0)
{
- char *name;
- int namelen;
-
- /*
- * Kludge alert. NAME is assigned to header.name
- * because during the extraction, the space that
- * contains the header will get scribbled on, and
- * the name will get munged, so any error messages
- * that happen to contain the filename will look
- * REAL interesting unless we do this.
- */
- namelen = strlen (skipcrud + current_file_name);
- name = (char *) malloc ((sizeof (char)) * namelen);
- bcopy (skipcrud + current_file_name, name, namelen);
- size = hstat.st_size;
- extract_sparse_file (fd, &size, hstat.st_size, name);
+ open_error (file_name);
+ return 1;
}
- else
- for (size = hstat.st_size;
- size > 0;
- size -= written)
+ }
+
+ if (current_stat_info.is_sparse)
+ sparse_extract_file (fd, ¤t_stat_info, &size);
+ else
+ for (size = current_stat_info.stat.st_size; size > 0; )
+ {
+ if (multi_volume_option)
{
+ assign_string (&save_name, current_stat_info.orig_file_name);
+ save_totsize = current_stat_info.stat.st_size;
+ save_sizeleft = size;
+ }
+
+ /* Locate data, determine max length writeable, write it,
+ block that we have used the data, then check if the write
+ worked. */
- /* long offset,
- numbytes;*/
-
- if (f_multivol)
- {
- save_name = current_file_name;
- save_totsize = hstat.st_size;
- save_sizeleft = size;
- }
-
- /*
- * Locate data, determine max length
- * writeable, write it, record that
- * we have used the data, then check
- * if the write worked.
- */
- data = findrec ()->charptr;
- if (data == NULL)
- { /* Check it... */
- msg ("Unexpected EOF on archive file");
- break;
- }
- /*
- * JK - If the file is sparse, use the sparsearray
- * that we created before to lseek into the new
- * file the proper amount, and to see how many
- * bytes we want to write at that position.
- */
- /* if (head->header.linkflag == LF_SPARSE) {
- off_t pos;
-
- pos = lseek(fd, (off_t) sparsearray[sparse_ind].offset, 0);
- printf("%d at %d\n", (int) pos, sparse_ind);
- written = sparsearray[sparse_ind++].numbytes;
- } else*/
- written = endofrecs ()->charptr - data;
- if (written > size)
- written = size;
- errno = 0;
- check = write (fd, data, written);
- /*
- * The following is in violation of strict
- * typing, since the arg to userec
- * should be a struct rec *. FIXME.
- */
- userec ((union record *) (data + written - 1));
- if (check == written)
- continue;
- /*
- * Error in writing to file.
- * Print it, skip to next file in archive.
- */
- if (check < 0)
- msg_perror ("couldn't write to file %s",
- skipcrud + current_file_name);
- else
- msg ("could only write %d of %d bytes to file %s",
- written, check, skipcrud + current_file_name);
- skip_file ((long) (size - written));
- break; /* Still do the close, mod time, chmod, etc */
+ data_block = find_next_block ();
+ if (! data_block)
+ {
+ ERROR ((0, 0, _("Unexpected EOF in archive")));
+ break; /* FIXME: What happens, then? */
}
- if (f_multivol)
- save_name = 0;
+ written = available_space_after (data_block);
- /* If writing to stdout, don't try to do anything
- to the filename; it doesn't exist, or we don't
- want to touch it anyway */
- if (f_exstdout)
- break;
+ if (written > size)
+ written = size;
+ errno = 0;
+ count = full_write (fd, data_block->buffer, written);
+ size -= written;
- /* if (head->header.isextended) {
- register union record *exhdr;
- register int i;
+ set_next_block_after ((union block *)
+ (data_block->buffer + written - 1));
+ if (count != written)
+ {
+ if (!to_command_option)
+ write_error_details (file_name, count, written);
+ /* FIXME: shouldn't we restore from backup? */
+ break;
+ }
+ }
- for (i = 0; i < 21; i++) {
- long offset;
+ skip_file (size);
- if (!exhdr->ext_hdr.sp[i].numbytes)
- break;
- offset = from_oct(1+12,
- exhdr->ext_hdr.sp[i].offset);
- written = from_oct(1+12,
- exhdr->ext_hdr.sp[i].numbytes);
- lseek(fd, offset, 0);
- check = write(fd, data, written);
- if (check == written) continue;
+ if (multi_volume_option)
+ assign_string (&save_name, 0);
- }
+ /* If writing to stdout, don't try to do anything to the filename;
+ it doesn't exist, or we don't want to touch it anyway. */
+ if (to_stdout_option)
+ return 0;
- }*/
- check = close (fd);
- if (check < 0)
- {
- msg_perror ("Error while closing %s",
- skipcrud + current_file_name);
- }
+ status = close (fd);
+ if (status < 0)
+ close_error (file_name);
+
+ if (to_command_option)
+ sys_wait_command ();
+ else
+ set_stat (file_name, ¤t_stat_info.stat, 0, 0,
+ (old_files_option == OVERWRITE_OLD_FILES ?
+ UNKNOWN_PERMSTATUS : ARCHIVED_PERMSTATUS),
+ typeflag);
+ return status;
+}
+
+static int
+extract_link (char *file_name, int typeflag)
+{
+ char const *link_name = safer_name_suffix (current_stat_info.link_name, true);
+ int interdir_made = 0;
- set_filestat:
+ do
+ {
+ struct stat st1, st2;
+ int e;
+ int status = link (link_name, file_name);
+ e = errno;
- /*
- * If we are root, set the owner and group of the extracted
- * file. This does what is wanted both on real Unix and on
- * System V. If we are running as a user, we extract as that
- * user; if running as root, we extract as the original owner.
- */
- if (we_are_root || f_do_chown)
+ if (status == 0)
{
- if (chown (skipcrud + current_file_name,
- hstat.st_uid, hstat.st_gid) < 0)
- {
- msg_perror ("cannot chown file %s to uid %d gid %d",
- skipcrud + current_file_name,
- hstat.st_uid, hstat.st_gid);
- }
+ struct delayed_symlink *ds = delayed_symlink_head;
+ if (ds && lstat (link_name, &st1) == 0)
+ for (; ds; ds = ds->next)
+ if (ds->dev == st1.st_dev
+ && ds->ino == st1.st_ino
+ && ds->mtime == st1.st_mtime)
+ {
+ struct string_list *p = xmalloc (offsetof (struct string_list, string)
+ + strlen (file_name) + 1);
+ strcpy (p->string, file_name);
+ p->next = ds->sources;
+ ds->sources = p;
+ break;
+ }
+ return 0;
}
+ else if ((e == EEXIST && strcmp (link_name, file_name) == 0)
+ || (lstat (link_name, &st1) == 0
+ && lstat (file_name, &st2) == 0
+ && st1.st_dev == st2.st_dev
+ && st1.st_ino == st2.st_ino))
+ return 0;
+
+ errno = e;
+ }
+ while (maybe_recoverable (file_name, &interdir_made));
+
+ if (!(incremental_option && errno == EEXIST))
+ {
+ link_error (link_name, file_name);
+ return 1;
+ }
+ return 0;
+}
+
+static int
+extract_symlink (char *file_name, int typeflag)
+{
+#ifdef HAVE_SYMLINK
+ int status, fd;
+ int interdir_made = 0;
+
+ if (absolute_names_option
+ || ! (IS_ABSOLUTE_FILE_NAME (current_stat_info.link_name)
+ || contains_dot_dot (current_stat_info.link_name)))
+ {
+ while ((status = symlink (current_stat_info.link_name, file_name)))
+ if (!maybe_recoverable (file_name, &interdir_made))
+ break;
+
+ if (status == 0)
+ set_stat (file_name, ¤t_stat_info.stat, 0, 0, 0, SYMTYPE);
+ else
+ symlink_error (current_stat_info.link_name, file_name);
+ }
+ else
+ {
+ /* This symbolic link is potentially dangerous. Don't
+ create it now; instead, create a placeholder file, which
+ will be replaced after other extraction is done. */
+ struct stat st;
- /*
- * Set the modified time of the file.
- *
- * Note that we set the accessed time to "now", which
- * is really "the time we started extracting files".
- * unless f_gnudump is used, in which case .st_atime is used
- */
- if (!f_modified)
+ while ((fd = open (file_name, O_WRONLY | O_CREAT | O_EXCL, 0)) < 0)
+ if (! maybe_recoverable (file_name, &interdir_made))
+ break;
+
+ status = -1;
+ if (fd < 0)
+ open_error (file_name);
+ else if (fstat (fd, &st) != 0)
{
- /* fixme if f_gnudump should set ctime too, but how? */
- if (f_gnudump)
- acc_upd_times.actime = hstat.st_atime;
- else
- acc_upd_times.actime = now; /* Accessed now */
- acc_upd_times.modtime = hstat.st_mtime; /* Mod'd */
- if (utime (skipcrud + current_file_name,
- &acc_upd_times) < 0)
- {
- msg_perror ("couldn't change access and modification times of %s", skipcrud + current_file_name);
- }
+ stat_error (file_name);
+ close (fd);
}
- /* We do the utime before the chmod because some versions of
- utime are broken and trash the modes of the file. Since
- we then change the mode anyway, we don't care. . . */
-
- /*
- * If '-k' is not set, open() or creat() could have saved
- * the permission bits from a previously created file,
- * ignoring the ones we specified.
- * Even if -k is set, if the file has abnormal
- * mode bits, we must chmod since writing or chown() has
- * probably reset them.
- *
- * If -k is set, we know *we* created this file, so the mode
- * bits were set by our open(). If the file is "normal", we
- * skip the chmod. This works because we did umask(0) if -p
- * is set, so umask will have left the specified mode alone.
- */
- if ((!f_keep)
- || (hstat.st_mode & (S_ISUID | S_ISGID | S_ISVTX)))
+ else if (close (fd) != 0)
+ close_error (file_name);
+ else
{
- if (chmod (skipcrud + current_file_name,
- notumask & (int) hstat.st_mode) < 0)
+ struct delayed_set_stat *h;
+ struct delayed_symlink *p = xmalloc (offsetof (struct delayed_symlink, target)
+ + strlen (current_stat_info.link_name)
+ + 1);
+ p->next = delayed_symlink_head;
+ delayed_symlink_head = p;
+ p->dev = st.st_dev;
+ p->ino = st.st_ino;
+ p->mtime = st.st_mtime;
+ p->uid = current_stat_info.stat.st_uid;
+ p->gid = current_stat_info.stat.st_gid;
+ p->sources = xmalloc (offsetof (struct string_list, string)
+ + strlen (file_name) + 1);
+ p->sources->next = 0;
+ strcpy (p->sources->string, file_name);
+ strcpy (p->target, current_stat_info.link_name);
+
+ h = delayed_set_stat_head;
+ if (h && ! h->after_symlinks
+ && strncmp (file_name, h->file_name, h->file_name_len) == 0
+ && ISSLASH (file_name[h->file_name_len])
+ && (base_name (file_name) == file_name + h->file_name_len + 1))
{
- msg_perror ("cannot change mode of file %s to %ld",
- skipcrud + current_file_name,
- notumask & (int) hstat.st_mode);
+ do
+ {
+ h->after_symlinks = 1;
+
+ if (stat (h->file_name, &st) != 0)
+ stat_error (h->file_name);
+ else
+ {
+ h->stat_info.st_dev = st.st_dev;
+ h->stat_info.st_ino = st.st_ino;
+ }
+ }
+ while ((h = h->next) && ! h->after_symlinks);
}
+
+ status = 0;
}
+ }
- quit:
- break;
+ return status;
- case LF_LINK:
- again_link:
- {
- struct stat st1, st2;
+#else
+ static int warned_once;
- check = link (current_link_name, skipcrud + current_file_name);
+ if (!warned_once)
+ {
+ warned_once = 1;
+ WARN ((0, 0, _("Attempting extraction of symbolic links as hard links")));
+ }
+ return extract_link (file_name, typeflag);
+#endif
+}
- if (check == 0)
- break;
- if (make_dirs (skipcrud + current_file_name))
- goto again_link;
- if (f_gnudump && errno == EEXIST)
- break;
- if (stat (current_link_name, &st1) == 0
- && stat (current_file_name + skipcrud, &st2) == 0
- && st1.st_dev == st2.st_dev
- && st1.st_ino == st2.st_ino)
- break;
- msg_perror ("Could not link %s to %s",
- skipcrud + current_file_name,
- current_link_name);
- }
- break;
+#if S_IFCHR || S_IFBLK
+static int
+extract_node (char *file_name, int typeflag)
+{
+ int status;
+ int interdir_made = 0;
+
+ do
+ status = mknod (file_name, current_stat_info.stat.st_mode,
+ current_stat_info.stat.st_rdev);
+ while (status && maybe_recoverable (file_name, &interdir_made));
+
+ if (status != 0)
+ mknod_error (file_name);
+ else
+ set_stat (file_name, ¤t_stat_info.stat, 0, 0, ARCHIVED_PERMSTATUS, typeflag);
+ return status;
+}
+#endif
-#ifdef S_ISLNK
- case LF_SYMLINK:
- again_symlink:
- check = symlink (current_link_name,
- skipcrud + current_file_name);
- /* FIXME, don't worry uid, gid, etc... */
- if (check == 0)
- break;
- if (make_dirs (current_file_name + skipcrud))
- goto again_symlink;
- msg_perror ("Could not create symlink to %s",
- current_link_name);
+#if HAVE_MKFIFO || defined mkfifo
+static int
+extract_fifo (char *file_name, int typeflag)
+{
+ int status;
+ int interdir_made = 0;
+
+ while ((status = mkfifo (file_name, current_stat_info.stat.st_mode)))
+ if (!maybe_recoverable (file_name, &interdir_made))
break;
-#endif
-#ifdef S_IFCHR
- case LF_CHR:
- hstat.st_mode |= S_IFCHR;
- goto make_node;
+ if (status == 0)
+ set_stat (file_name, ¤t_stat_info.stat, NULL, 0,
+ ARCHIVED_PERMSTATUS, typeflag);
+ else
+ mkfifo_error (file_name);
+ return status;
+}
#endif
-#ifdef S_IFBLK
- case LF_BLK:
- hstat.st_mode |= S_IFBLK;
-#endif
-#if defined(S_IFCHR) || defined(S_IFBLK)
- make_node:
- check = mknod (current_file_name + skipcrud,
- (int) hstat.st_mode, (int) hstat.st_rdev);
- if (check != 0)
- {
- if (make_dirs (skipcrud + current_file_name))
- goto make_node;
- msg_perror ("Could not make %s",
- current_file_name + skipcrud);
- break;
- };
- goto set_filestat;
-#endif
+static int
+extract_mangle_wrapper (char *file_name, int typeflag)
+{
+ extract_mangle ();
+ return 0;
+}
-#ifdef S_ISFIFO
- /* If local system doesn't support FIFOs, use default case */
- case LF_FIFO:
- make_fifo:
- check = mkfifo (current_file_name + skipcrud,
- (int) hstat.st_mode);
- if (check != 0)
- {
- if (make_dirs (current_file_name + skipcrud))
- goto make_fifo;
- msg_perror ("Could not make %s",
- skipcrud + current_file_name);
- break;
- };
- goto set_filestat;
-#endif
- case LF_DIR:
- case LF_DUMPDIR:
- namelen = strlen (current_file_name) + skipcrud - 1;
- really_dir:
- /* Check for trailing /, and zap as many as we find. */
- while (namelen
- && current_file_name[skipcrud + namelen] == '/')
- current_file_name[skipcrud + namelen--] = '\0';
- if (f_gnudump)
- { /* Read the entry and delete files
- that aren't listed in the archive */
- gnu_restore (skipcrud);
+static int
+extract_failure (char *file_name, int typeflag)
+{
+ return 1;
+}
- }
- else if (head->header.linkflag == LF_DUMPDIR)
- skip_file ((long) (hstat.st_size));
+typedef int (*tar_extractor_t) (char *file_name, int typeflag);
+\f
- again_dir:
- check = mkdir (skipcrud + current_file_name,
- (we_are_root ? 0 : 0300) | (int) hstat.st_mode);
- if (check != 0)
- {
- struct stat st1;
-
- if (make_dirs (skipcrud + current_file_name))
- goto again_dir;
- /* If we're trying to create '.', let it be. */
- if (current_file_name[skipcrud + namelen] == '.' &&
- (namelen == 0 ||
- current_file_name[skipcrud + namelen - 1] == '/'))
- goto check_perms;
- if (errno == EEXIST
- && stat (skipcrud + current_file_name, &st1) == 0
- && (S_ISDIR (st1.st_mode)))
- break;
- msg_perror ("Could not create directory %s", skipcrud + current_file_name);
- break;
- }
+/* Prepare to extract a file. Find extractor function.
+ Return zero if extraction should not proceed. */
- check_perms:
- if (!we_are_root && 0300 != (0300 & (int) hstat.st_mode))
- {
- hstat.st_mode |= 0300;
- msg ("Added write and execute permission to directory %s",
- skipcrud + current_file_name);
- }
+static int
+prepare_to_extract (char const *file_name, int typeflag, tar_extractor_t *fun)
+{
+ int rc = 1;
+
+ if (EXTRACT_OVER_PIPE)
+ rc = 0;
- if (f_modified)
- goto set_filestat;
- tmp = (struct saved_dir_info *) malloc (sizeof (struct saved_dir_info));
- tmp->path = malloc (strlen (skipcrud + current_file_name) + 1);
- strcpy (tmp->path, skipcrud + current_file_name);
- tmp->mode = hstat.st_mode;
- tmp->atime = hstat.st_atime;
- tmp->mtime = hstat.st_mtime;
- tmp->next = saved_dir_info_head;
- saved_dir_info_head = tmp;
- case LF_VOLHDR:
- if (f_verbose)
+ /* Select the extractor */
+ switch (typeflag)
+ {
+ case GNUTYPE_SPARSE:
+ *fun = extract_file;
+ rc = 1;
+ break;
+
+ case AREGTYPE:
+ case REGTYPE:
+ case CONTTYPE:
+ /* Appears to be a file. But BSD tar uses the convention that a slash
+ suffix means a directory. */
+ if (current_stat_info.had_trailing_slash)
+ *fun = extract_dir;
+ else
{
- printf ("Reading %s\n", current_file_name);
+ *fun = extract_file;
+ rc = 1;
}
break;
- case LF_NAMES:
- extract_mangle (head);
+ case SYMTYPE:
+ *fun = extract_symlink;
break;
- case LF_MULTIVOL:
- msg ("Can't extract '%s'--file is continued from another volume\n", current_file_name);
- skip_file ((long) hstat.st_size);
+ case LNKTYPE:
+ *fun = extract_link;
break;
- case LF_LONGNAME:
- case LF_LONGLINK:
- msg ("Visible long name error\n");
- skip_file ((long) hstat.st_size);
+#if S_IFCHR
+ case CHRTYPE:
+ current_stat_info.stat.st_mode |= S_IFCHR;
+ *fun = extract_node;
break;
- }
+#endif
- /* We don't need to save it any longer. */
- saverec ((union record **) 0);/* Unsave it */
-}
+#if S_IFBLK
+ case BLKTYPE:
+ current_stat_info.stat.st_mode |= S_IFBLK;
+ *fun = extract_node;
+ break;
+#endif
-/*
- * After a file/link/symlink/dir creation has failed, see if
- * it's because some required directory was not present, and if
- * so, create all required dirs.
- */
-int
-make_dirs (pathname)
- char *pathname;
-{
- char *p; /* Points into path */
- int madeone = 0; /* Did we do anything yet? */
- int save_errno = errno; /* Remember caller's errno */
- int check;
+#if HAVE_MKFIFO || defined mkfifo
+ case FIFOTYPE:
+ *fun = extract_fifo;
+ break;
+#endif
+
+ case DIRTYPE:
+ case GNUTYPE_DUMPDIR:
+ *fun = extract_dir;
+ break;
+
+ case GNUTYPE_VOLHDR:
+ if (verbose_option)
+ fprintf (stdlis, _("Reading %s\n"), quote (current_stat_info.file_name));
+ *fun = NULL;
+ break;
+
+ case GNUTYPE_NAMES:
+ *fun = extract_mangle_wrapper;
+ break;
+
+ case GNUTYPE_MULTIVOL:
+ ERROR ((0, 0,
+ _("%s: Cannot extract -- file is continued from another volume"),
+ quotearg_colon (current_stat_info.file_name)));
+ *fun = extract_failure;
+ break;
+
+ case GNUTYPE_LONGNAME:
+ case GNUTYPE_LONGLINK:
+ ERROR ((0, 0, _("Unexpected long name header")));
+ *fun = extract_failure;
+ break;
- if (errno != ENOENT)
- return 0; /* Not our problem */
+ default:
+ WARN ((0, 0,
+ _("%s: Unknown file type `%c', extracted as normal file"),
+ quotearg_colon (file_name), typeflag));
+ *fun = extract_file;
+ }
+
+ /* Determine whether the extraction should proceed */
+ if (rc == 0)
+ return 0;
- for (p = index (pathname, '/'); p != NULL; p = index (p + 1, '/'))
+ switch (old_files_option)
{
- /* Avoid mkdir of empty string, if leading or double '/' */
- if (p == pathname || p[-1] == '/')
- continue;
- /* Avoid mkdir where last part of path is '.' */
- if (p[-1] == '.' && (p == pathname + 1 || p[-2] == '/'))
- continue;
- *p = 0; /* Truncate the path there */
- check = mkdir (pathname, 0777); /* Try to create it as a dir */
- if (check == 0)
+ case UNLINK_FIRST_OLD_FILES:
+ if (!remove_any_file (file_name,
+ recursive_unlink_option ? RECURSIVE_REMOVE_OPTION
+ : ORDINARY_REMOVE_OPTION)
+ && errno && errno != ENOENT)
{
- /* Fix ownership */
- if (we_are_root)
- {
- if (chown (pathname, hstat.st_uid,
- hstat.st_gid) < 0)
- {
- msg_perror ("cannot change owner of %s to uid %d gid %d", pathname, hstat.st_uid, hstat.st_gid);
- }
- }
- pr_mkdir (pathname, p - pathname, notumask & 0777);
- madeone++; /* Remember if we made one */
- *p = '/';
- continue;
+ unlink_error (file_name);
+ return 0;
}
- *p = '/';
- if (errno == EEXIST) /* Directory already exists */
- continue;
- /*
- * Some other error in the mkdir. We return to the caller.
- */
+ break;
+
+ case KEEP_NEWER_FILES:
+ if (file_newer_p (file_name, ¤t_stat_info))
+ {
+ WARN ((0, 0, _("Current %s is newer or same age"),
+ quote (file_name)));
+ return 0;
+ }
+ break;
+
+ default:
break;
}
- errno = save_errno; /* Restore caller's errno */
- return madeone; /* Tell them to retry if we made one */
+ return 1;
}
+/* Extract a file from the archive. */
void
-extract_sparse_file (fd, sizeleft, totalsize, name)
- int fd;
- long *sizeleft, totalsize;
- char *name;
+extract_archive (void)
{
- /* register char *data;*/
- union record *datarec;
- int sparse_ind = 0;
- int written, count;
+ char typeflag;
+ char *file_name;
+ tar_extractor_t fun;
+
+ set_next_block_after (current_header);
+ decode_header (current_header, ¤t_stat_info, ¤t_format, 1);
- /* assuming sizeleft is initially totalsize */
+ if (interactive_option && !confirm ("extract", current_stat_info.file_name))
+ {
+ skip_member ();
+ return;
+ }
+ /* Print the block from current_header and current_stat. */
- while (*sizeleft > 0)
+ if (verbose_option)
+ print_header (¤t_stat_info, -1);
+
+ file_name = safer_name_suffix (current_stat_info.file_name, false);
+ if (strip_name_components)
{
- datarec = findrec ();
- if (datarec == NULL)
+ size_t prefix_len = stripped_prefix_len (file_name, strip_name_components);
+ if (prefix_len == (size_t) -1)
{
- msg ("Unexpected EOF on archive file");
+ skip_member ();
return;
}
- lseek (fd, sparsearray[sparse_ind].offset, 0);
- written = sparsearray[sparse_ind++].numbytes;
- while (written > RECORDSIZE)
- {
- count = write (fd, datarec->charptr, RECORDSIZE);
- if (count < 0)
- msg_perror ("couldn't write to file %s", name);
- written -= count;
- *sizeleft -= count;
- userec (datarec);
- datarec = findrec ();
- }
+ file_name += prefix_len;
+ }
- count = write (fd, datarec->charptr, written);
+ apply_nonancestor_delayed_set_stat (file_name, 0);
- if (count < 0)
- {
- msg_perror ("couldn't write to file %s", name);
- }
- else if (count != written)
- {
- msg ("could only write %d of %d bytes to file %s", totalsize - *sizeleft, totalsize, name);
- skip_file ((long) (*sizeleft));
- }
+ /* Take a safety backup of a previously existing file. */
+
+ if (backup_option)
+ if (!maybe_backup_file (file_name, 0))
+ {
+ int e = errno;
+ ERROR ((0, e, _("%s: Was unable to backup this file"),
+ quotearg_colon (file_name)));
+ skip_member ();
+ return;
+ }
- written -= count;
- *sizeleft -= count;
- userec (datarec);
+ /* Extract the archive entry according to its type. */
+
+ /* KLUDGE */
+ typeflag = sparse_member_p (¤t_stat_info) ?
+ GNUTYPE_SPARSE : current_header->header.typeflag;
+
+ if (prepare_to_extract (file_name, typeflag, &fun))
+ {
+ if (fun && (*fun) (file_name, typeflag) && backup_option)
+ undo_last_backup ();
}
- free (sparsearray);
- /* if (end_nulls) {
- register int i;
-
- printf("%d\n", (int) end_nulls);
- for (i = 0; i < end_nulls; i++)
- write(fd, "\000", 1);
- }*/
- userec (datarec);
+ else
+ skip_member ();
+
}
-/* Set back the utime and mode for all the extracted directories. */
-void
-restore_saved_dir_info ()
+/* Extract the symbolic links whose final extraction were delayed. */
+static void
+apply_delayed_symlinks (void)
{
- struct utimbuf acc_upd_times;
+ struct delayed_symlink *ds;
- while (saved_dir_info_head != NULL)
+ for (ds = delayed_symlink_head; ds; )
{
- /* fixme if f_gnudump should set ctime too, but how? */
- if (f_gnudump)
- acc_upd_times.actime = saved_dir_info_head->atime;
- else
- acc_upd_times.actime = now; /* Accessed now */
- acc_upd_times.modtime = saved_dir_info_head->mtime; /* Mod'd */
- if (utime (saved_dir_info_head->path, &acc_upd_times) < 0)
- {
- msg_perror ("couldn't change access and modification times of %s",
- saved_dir_info_head->path);
- }
- if ((!f_keep) || (saved_dir_info_head->mode & (S_ISUID | S_ISGID | S_ISVTX)))
+ struct string_list *sources = ds->sources;
+ char const *valid_source = 0;
+
+ for (sources = ds->sources; sources; sources = sources->next)
{
- if (chmod (saved_dir_info_head->path,
- notumask & saved_dir_info_head->mode) < 0)
+ char const *source = sources->string;
+ struct stat st;
+
+ /* Make sure the placeholder file is still there. If not,
+ don't create a symlink, as the placeholder was probably
+ removed by a later extraction. */
+ if (lstat (source, &st) == 0
+ && st.st_dev == ds->dev
+ && st.st_ino == ds->ino
+ && st.st_mtime == ds->mtime)
{
- msg_perror ("cannot change mode of file %s to %ld",
- saved_dir_info_head->path,
- notumask & saved_dir_info_head->mode);
+ /* Unlink the placeholder, then create a hard link if possible,
+ a symbolic link otherwise. */
+ if (unlink (source) != 0)
+ unlink_error (source);
+ else if (valid_source && link (valid_source, source) == 0)
+ ;
+ else if (symlink (ds->target, source) != 0)
+ symlink_error (ds->target, source);
+ else
+ {
+ valid_source = source;
+ st.st_uid = ds->uid;
+ st.st_gid = ds->gid;
+ set_stat (source, &st, 0, 0, 0, SYMTYPE);
+ }
}
}
- saved_dir_info_head = saved_dir_info_head->next;
+
+ for (sources = ds->sources; sources; )
+ {
+ struct string_list *next = sources->next;
+ free (sources);
+ sources = next;
+ }
+
+ {
+ struct delayed_symlink *next = ds->next;
+ free (ds);
+ ds = next;
+ }
}
+
+ delayed_symlink_head = 0;
+}
+
+/* Finish the extraction of an archive. */
+void
+extract_finish (void)
+{
+ /* First, fix the status of ordinary directories that need fixing. */
+ apply_nonancestor_delayed_set_stat ("", 0);
+
+ /* Then, apply delayed symlinks, so that they don't affect delayed
+ directory status-setting for ordinary directories. */
+ apply_delayed_symlinks ();
+
+ /* Finally, fix the status of directories that are ancestors
+ of delayed symlinks. */
+ apply_nonancestor_delayed_set_stat ("", 1);
+}
+
+void
+fatal_exit (void)
+{
+ extract_finish ();
+ error (TAREXIT_FAILURE, 0, _("Error is not recoverable: exiting now"));
+ abort ();
+}
+
+void
+xalloc_die (void)
+{
+ error (0, 0, "%s", _("memory exhausted"));
+ fatal_exit ();
}
projects / chaz / tar / blobdiff