/* Create a tar archive.
- Copyright 1985,92,93,94,96,97,99,2000, 2001 Free Software Foundation, Inc.
+
+ Copyright (C) 1985, 1992, 1993, 1994, 1996, 1997, 1999, 2000, 2001,
+ 2003, 2004, 2005 Free Software Foundation, Inc.
+
Written by John Gilmore, on 1985-08-25.
This program is free software; you can redistribute it and/or modify it
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.,
- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-
-#include "system.h"
-
-#if !MSDOS
-# include <pwd.h>
-# include <grp.h>
-#endif
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#if HAVE_UTIME_H
-# include <utime.h>
-#else
-struct utimbuf
- {
- long actime;
- long modtime;
- };
-#endif
+#include <system.h>
#include <quotearg.h>
+#include <utimens.h>
#include "common.h"
#include <hash.h>
-#ifndef MSDOS
-extern dev_t ar_dev;
-extern ino_t ar_ino;
-#endif
-
struct link
{
dev_t dev;
ino_t ino;
+ size_t nlink;
char name[1];
};
\f
? ((uintmax_t) 1 << ((digits) * (bits_per_digit))) - 1 \
: (uintmax_t) -1)
+/* The maximum uintmax_t value that can be represented with octal
+ digits and a trailing NUL in BUFFER. */
+#define MAX_OCTAL_VAL(buffer) MAX_VAL_WITH_DIGITS (sizeof (buffer) - 1, LG_8)
+
/* Convert VALUE to an octal representation suitable for tar headers.
Output to buffer WHERE with size SIZE.
The result is undefined if SIZE is 0 or if VALUE is too large to fit. */
while (i);
}
+/* Copy at most LEN bytes from the string SRC to DST. Terminate with
+ NUL unless SRC is LEN or more bytes long. */
+
+static void
+tar_copy_str (char *dst, const char *src, size_t len)
+{
+ size_t i;
+ for (i = 0; i < len; i++)
+ if (! (dst[i] = src[i]))
+ break;
+}
+
+/* Same as tar_copy_str, but always terminate with NUL if using
+ is OLDGNU format */
+
+static void
+tar_name_copy_str (char *dst, const char *src, size_t len)
+{
+ tar_copy_str (dst, src, len);
+ if (archive_format == OLDGNU_FORMAT)
+ dst[len-1] = 0;
+}
+
/* Convert NEGATIVE VALUE to a base-256 representation suitable for
tar headers. NEGATIVE is 1 if VALUE was negative before being cast
to uintmax_t, 0 otherwise. Output to buffer WHERE with size SIZE.
static void
to_chars (int negative, uintmax_t value, size_t valsize,
- uintmax_t (*substitute) PARAMS ((int *)),
+ uintmax_t (*substitute) (int *),
char *where, size_t size, const char *type)
{
int base256_allowed = (archive_format == GNU_FORMAT
{
int negsub;
uintmax_t sub = substitute (&negsub) & maxval;
+ /* FIXME: This is the only place where GNU_FORMAT differs from
+ OLDGNU_FORMAT. Apart from this they are completely identical. */
uintmax_t s = (negsub &= archive_format == GNU_FORMAT) ? - sub : sub;
char subbuf[UINTMAX_STRSIZE_BOUND + 1];
char *sub_string = STRINGIFY_BIGINT (s, subbuf + 1);
&& S_IRGRP == TGREAD && S_IWGRP == TGWRITE && S_IXGRP == TGEXEC
&& S_IROTH == TOREAD && S_IWOTH == TOWRITE && S_IXOTH == TOEXEC
&& archive_format != POSIX_FORMAT
+ && archive_format != USTAR_FORMAT
&& archive_format != GNU_FORMAT)
{
negative = v < 0;
{
to_chars (0, v, sizeof v, 0, p, s, "uintmax_t");
}
+
+void
+string_to_chars (char const *str, char *p, size_t s)
+{
+ tar_copy_str (p, str, s);
+ p[s - 1] = '\0';
+}
+
\f
-/* Writing routines. */
+/* A file is not dumpable if
+ a) it is empty *and* world-readable, or
+ b) current archive is /dev/null */
-/* Zero out the buffer so we don't confuse ourselves with leftover
- data. */
-static void
-clear_buffer (char *buffer)
+bool
+file_dumpable_p (struct tar_stat_info *st)
{
- memset (buffer, 0, BLOCKSIZE);
+ return !(dev_null_output
+ || (st->archive_file_size == 0
+ && (st->stat.st_mode & MODE_R) == MODE_R));
}
+\f
+/* Writing routines. */
+
/* Write the EOT block(s). Zero at least two blocks, through the end
of the record. Old tar, as previous versions of GNU tar, writes
garbage after two zeroed blocks. */
set_next_block_after (pointer);
}
-/* Write a GNUTYPE_LONGLINK or GNUTYPE_LONGNAME block. */
+/* Write a "private" header */
+union block *
+start_private_header (const char *name, size_t size)
+{
+ time_t t;
+ union block *header = find_next_block ();
+
+ memset (header->buffer, 0, sizeof (union block));
+
+ tar_name_copy_str (header->header.name, name, NAME_FIELD_SIZE);
+ OFF_TO_CHARS (size, header->header.size);
+
+ time (&t);
+ TIME_TO_CHARS (t, header->header.mtime);
+ MODE_TO_CHARS (S_IFREG|S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, header->header.mode);
+ UID_TO_CHARS (getuid (), header->header.uid);
+ GID_TO_CHARS (getgid (), header->header.gid);
+ MAJOR_TO_CHARS (0, header->header.devmajor);
+ MINOR_TO_CHARS (0, header->header.devminor);
+ strncpy (header->header.magic, TMAGIC, TMAGLEN);
+ strncpy (header->header.version, TVERSION, TVERSLEN);
+ return header;
+}
-/* FIXME: Cross recursion between start_header and write_long! */
+/* Create a new header and store there at most NAME_FIELD_SIZE bytes of
+ the file name */
+
+static union block *
+write_short_name (struct tar_stat_info *st)
+{
+ union block *header = find_next_block ();
+ memset (header->buffer, 0, sizeof (union block));
+ tar_name_copy_str (header->header.name, st->file_name, NAME_FIELD_SIZE);
+ return header;
+}
-static union block *start_header PARAMS ((const char *, struct stat *));
+#define FILL(field,byte) do { \
+ memset(field, byte, sizeof(field)-1); \
+ (field)[sizeof(field)-1] = 0; \
+} while (0)
+/* Write a GNUTYPE_LONGLINK or GNUTYPE_LONGNAME block. */
static void
-write_long (const char *p, char type)
+write_gnu_long_link (struct tar_stat_info *st, const char *p, char type)
{
size_t size = strlen (p) + 1;
size_t bufsize;
union block *header;
- struct stat foo;
-
- memset (&foo, 0, sizeof foo);
- foo.st_size = size;
-
- header = start_header ("././@LongLink", &foo);
+ char *tmpname;
+
+ header = start_private_header ("././@LongLink", size);
+ FILL(header->header.mtime, '0');
+ FILL(header->header.mode, '0');
+ FILL(header->header.uid, '0');
+ FILL(header->header.gid, '0');
+ FILL(header->header.devmajor, 0);
+ FILL(header->header.devminor, 0);
+ uid_to_uname (0, &tmpname);
+ UNAME_TO_CHARS (tmpname, header->header.uname);
+ free (tmpname);
+ gid_to_gname (0, &tmpname);
+ GNAME_TO_CHARS (tmpname, header->header.gname);
+ free (tmpname);
+
+ strcpy (header->header.magic, OLDGNU_MAGIC);
header->header.typeflag = type;
- finish_header (header);
+ finish_header (st, header, -1);
header = find_next_block ();
memset (header->buffer + size, 0, bufsize - size);
set_next_block_after (header + (size - 1) / BLOCKSIZE);
}
-\f
-/* Return a suffix of the file NAME that is a relative file name.
- Warn about `..' in file names. But return NAME if the user wants
- absolute file names. */
-static char const *
-relativize (char const *name)
+
+static size_t
+split_long_name (const char *name, size_t length)
+{
+ size_t i;
+
+ if (length > PREFIX_FIELD_SIZE)
+ length = PREFIX_FIELD_SIZE+2;
+ for (i = length - 1; i > 0; i--)
+ if (ISSLASH (name[i]))
+ break;
+ return i;
+}
+
+static union block *
+write_ustar_long_name (const char *name)
+{
+ size_t length = strlen (name);
+ size_t i;
+ union block *header;
+
+ if (length > PREFIX_FIELD_SIZE + NAME_FIELD_SIZE + 1)
+ {
+ ERROR ((0, 0, _("%s: file name is too long (max %d); not dumped"),
+ quotearg_colon (name),
+ PREFIX_FIELD_SIZE + NAME_FIELD_SIZE + 1));
+ return NULL;
+ }
+
+ i = split_long_name (name, length);
+ if (i == 0 || length - i - 1 > NAME_FIELD_SIZE)
+ {
+ ERROR ((0, 0,
+ _("%s: file name is too long (cannot be split); not dumped"),
+ quotearg_colon (name)));
+ return NULL;
+ }
+
+ header = find_next_block ();
+ memset (header->buffer, 0, sizeof (header->buffer));
+ memcpy (header->header.prefix, name, i);
+ memcpy (header->header.name, name + i + 1, length - i - 1);
+
+ return header;
+}
+
+/* Write a long link name, depending on the current archive format */
+static void
+write_long_link (struct tar_stat_info *st)
{
- if (! absolute_names_option)
+ switch (archive_format)
{
- {
- static int warned_once;
- if (! warned_once && contains_dot_dot (name))
- {
- warned_once = 1;
- WARN ((0, 0, _("Member names contain `..'")));
- }
- }
+ case POSIX_FORMAT:
+ xheader_store ("linkpath", st, NULL);
+ break;
- {
- size_t prefix_len = FILESYSTEM_PREFIX_LEN (name);
+ case V7_FORMAT: /* old V7 tar format */
+ case USTAR_FORMAT:
+ case STAR_FORMAT:
+ ERROR ((0, 0,
+ _("%s: link name is too long; not dumped"),
+ quotearg_colon (st->link_name)));
+ break;
- while (ISSLASH (name[prefix_len]))
- prefix_len++;
+ case OLDGNU_FORMAT:
+ case GNU_FORMAT:
+ write_gnu_long_link (st, st->link_name, GNUTYPE_LONGLINK);
+ break;
- if (prefix_len)
- {
- static int warned_once;
- if (!warned_once)
- {
- warned_once = 1;
- WARN ((0, 0, _("Removing leading `%.*s' from member names"),
- (int) prefix_len, name));
- }
- name += prefix_len;
- }
- }
+ default:
+ abort(); /*FIXME*/
}
+}
- return name;
+static union block *
+write_long_name (struct tar_stat_info *st)
+{
+ switch (archive_format)
+ {
+ case POSIX_FORMAT:
+ xheader_store ("path", st, NULL);
+ break;
+
+ case V7_FORMAT:
+ if (strlen (st->file_name) > NAME_FIELD_SIZE-1)
+ {
+ ERROR ((0, 0, _("%s: file name is too long (max %d); not dumped"),
+ quotearg_colon (st->file_name),
+ NAME_FIELD_SIZE - 1));
+ return NULL;
+ }
+ break;
+
+ case USTAR_FORMAT:
+ case STAR_FORMAT:
+ return write_ustar_long_name (st->file_name);
+
+ case OLDGNU_FORMAT:
+ case GNU_FORMAT:
+ write_gnu_long_link (st, st->file_name, GNUTYPE_LONGNAME);
+ break;
+
+ default:
+ abort(); /*FIXME*/
+ }
+ return write_short_name (st);
+}
+
+static union block *
+write_extended (struct tar_stat_info *st, union block *old_header)
+{
+ union block *header, hp;
+ char *p;
+
+ if (extended_header.buffer || extended_header.stk == NULL)
+ return old_header;
+
+ xheader_finish (&extended_header);
+ memcpy (hp.buffer, old_header, sizeof (hp));
+ p = xheader_xhdr_name (st);
+ xheader_write (XHDTYPE, p, &extended_header);
+ free (p);
+ header = find_next_block ();
+ memcpy (header, &hp.buffer, sizeof (hp.buffer));
+ return header;
+}
+
+static union block *
+write_header_name (struct tar_stat_info *st)
+{
+ if (archive_format == POSIX_FORMAT && !string_ascii_p (st->file_name))
+ {
+ xheader_store ("path", st, NULL);
+ return write_short_name (st);
+ }
+ else if (NAME_FIELD_SIZE - (archive_format == OLDGNU_FORMAT)
+ < strlen (st->file_name))
+ return write_long_name (st);
+ else
+ return write_short_name (st);
}
+
\f
/* Header handling. */
/* Make a header block for the file whose stat info is st,
and return its address. */
-static union block *
-start_header (const char *name, struct stat *st)
+union block *
+start_header (struct tar_stat_info *st)
{
union block *header;
- name = relativize (name);
-
- if (sizeof header->header.name <= strlen (name))
- write_long (name, GNUTYPE_LONGNAME);
- header = find_next_block ();
- memset (header->buffer, 0, sizeof (union block));
-
- assign_string (¤t_file_name, name);
-
- strncpy (header->header.name, name, NAME_FIELD_SIZE);
- header->header.name[NAME_FIELD_SIZE - 1] = '\0';
+ header = write_header_name (st);
+ if (!header)
+ return NULL;
/* Override some stat fields, if requested to do so. */
if (owner_option != (uid_t) -1)
- st->st_uid = owner_option;
+ st->stat.st_uid = owner_option;
if (group_option != (gid_t) -1)
- st->st_gid = group_option;
+ st->stat.st_gid = group_option;
if (mode_option)
- st->st_mode = ((st->st_mode & ~MODE_ALL)
- | mode_adjust (st->st_mode, mode_option));
+ st->stat.st_mode =
+ ((st->stat.st_mode & ~MODE_ALL)
+ | mode_adjust (st->stat.st_mode, mode_option, initial_umask));
/* Paul Eggert tried the trivial test ($WRITER cf a b; $READER tvf a)
for a few tars and came up with the following interoperability
above, thus making GNU tar both a universal donor and a universal
acceptor for Paul's test. */
- if (archive_format == V7_FORMAT)
- MODE_TO_CHARS (st->st_mode & MODE_ALL, header->header.mode);
+ if (archive_format == V7_FORMAT || archive_format == USTAR_FORMAT)
+ MODE_TO_CHARS (st->stat.st_mode & MODE_ALL, header->header.mode);
else
- MODE_TO_CHARS (st->st_mode, header->header.mode);
+ MODE_TO_CHARS (st->stat.st_mode, header->header.mode);
- UID_TO_CHARS (st->st_uid, header->header.uid);
- GID_TO_CHARS (st->st_gid, header->header.gid);
- OFF_TO_CHARS (st->st_size, header->header.size);
- TIME_TO_CHARS (st->st_mtime, header->header.mtime);
+ {
+ uid_t uid = st->stat.st_uid;
+ if (archive_format == POSIX_FORMAT
+ && MAX_OCTAL_VAL (header->header.uid) < uid)
+ {
+ xheader_store ("uid", st, NULL);
+ uid = 0;
+ }
+ UID_TO_CHARS (uid, header->header.uid);
+ }
- if (incremental_option)
- if (archive_format == OLDGNU_FORMAT)
+ {
+ gid_t gid = st->stat.st_gid;
+ if (archive_format == POSIX_FORMAT
+ && MAX_OCTAL_VAL (header->header.gid) < gid)
+ {
+ xheader_store ("gid", st, NULL);
+ gid = 0;
+ }
+ GID_TO_CHARS (gid, header->header.gid);
+ }
+
+ {
+ off_t size = st->stat.st_size;
+ if (archive_format == POSIX_FORMAT
+ && MAX_OCTAL_VAL (header->header.size) < size)
+ {
+ xheader_store ("size", st, NULL);
+ size = 0;
+ }
+ OFF_TO_CHARS (size, header->header.size);
+ }
+
+ {
+ struct timespec mtime = get_stat_mtime (&st->stat);
+ if (archive_format == POSIX_FORMAT)
{
- TIME_TO_CHARS (st->st_atime, header->oldgnu_header.atime);
- TIME_TO_CHARS (st->st_ctime, header->oldgnu_header.ctime);
+ if (MAX_OCTAL_VAL (header->header.mtime) < mtime.tv_sec
+ || mtime.tv_nsec != 0)
+ xheader_store ("mtime", st, NULL);
+ if (MAX_OCTAL_VAL (header->header.mtime) < mtime.tv_sec)
+ mtime.tv_sec = 0;
+ }
+ TIME_TO_CHARS (mtime.tv_sec, header->header.mtime);
+ }
+
+ /* FIXME */
+ if (S_ISCHR (st->stat.st_mode)
+ || S_ISBLK (st->stat.st_mode))
+ {
+ major_t devmajor = major (st->stat.st_rdev);
+ minor_t devminor = minor (st->stat.st_rdev);
+
+ if (archive_format == POSIX_FORMAT
+ && MAX_OCTAL_VAL (header->header.devmajor) < devmajor)
+ {
+ xheader_store ("devmajor", st, NULL);
+ devmajor = 0;
+ }
+ MAJOR_TO_CHARS (devmajor, header->header.devmajor);
+
+ if (archive_format == POSIX_FORMAT
+ && MAX_OCTAL_VAL (header->header.devminor) < devminor)
+ {
+ xheader_store ("devminor", st, NULL);
+ devminor = 0;
+ }
+ MINOR_TO_CHARS (devminor, header->header.devminor);
+ }
+ else if (archive_format != GNU_FORMAT && archive_format != OLDGNU_FORMAT)
+ {
+ MAJOR_TO_CHARS (0, header->header.devmajor);
+ MINOR_TO_CHARS (0, header->header.devminor);
+ }
+
+ if (archive_format == POSIX_FORMAT)
+ {
+ xheader_store ("atime", st, NULL);
+ xheader_store ("ctime", st, NULL);
+ }
+ else if (incremental_option)
+ if (archive_format == OLDGNU_FORMAT || archive_format == GNU_FORMAT)
+ {
+ TIME_TO_CHARS (st->stat.st_atime, header->oldgnu_header.atime);
+ TIME_TO_CHARS (st->stat.st_ctime, header->oldgnu_header.ctime);
}
header->header.typeflag = archive_format == V7_FORMAT ? AREGTYPE : REGTYPE;
break;
case OLDGNU_FORMAT:
+ case GNU_FORMAT: /*FIXME?*/
/* Overwrite header->header.magic and header.version in one blow. */
strcpy (header->header.magic, OLDGNU_MAGIC);
break;
case POSIX_FORMAT:
- case GNU_FORMAT:
+ case USTAR_FORMAT:
strncpy (header->header.magic, TMAGIC, TMAGLEN);
strncpy (header->header.version, TVERSION, TVERSLEN);
break;
}
else
{
- uid_to_uname (st->st_uid, header->header.uname);
- gid_to_gname (st->st_gid, header->header.gname);
+ uid_to_uname (st->stat.st_uid, &st->uname);
+ gid_to_gname (st->stat.st_gid, &st->gname);
+
+ if (archive_format == POSIX_FORMAT
+ && (strlen (st->uname) > UNAME_FIELD_SIZE
+ || !string_ascii_p (st->uname)))
+ xheader_store ("uname", st, NULL);
+ UNAME_TO_CHARS (st->uname, header->header.uname);
+
+ if (archive_format == POSIX_FORMAT
+ && (strlen (st->gname) > GNAME_FIELD_SIZE
+ || !string_ascii_p (st->gname)))
+ xheader_store ("gname", st, NULL);
+ GNAME_TO_CHARS (st->gname, header->header.gname);
}
return header;
}
-/* Finish off a filled-in header block and write it out. We also
- print the file name and/or full info if verbose is on. */
void
-finish_header (union block *header)
+simple_finish_header (union block *header)
{
size_t i;
int sum;
uintmax_to_chars ((uintmax_t) sum, header->header.chksum, 7);
+ set_next_block_after (header);
+}
+
+/* Finish off a filled-in header block and write it out. We also
+ print the file name and/or full info if verbose is on. If BLOCK_ORDINAL
+ is not negative, is the block ordinal of the first record for this
+ file, which may be a preceding long name or long link record. */
+void
+finish_header (struct tar_stat_info *st,
+ union block *header, off_t block_ordinal)
+{
+ /* Note: It is important to do this before the call to write_extended(),
+ so that the actual ustar header is printed */
if (verbose_option
&& header->header.typeflag != GNUTYPE_LONGLINK
- && header->header.typeflag != GNUTYPE_LONGNAME)
+ && header->header.typeflag != GNUTYPE_LONGNAME
+ && header->header.typeflag != XHDTYPE
+ && header->header.typeflag != XGLTYPE)
{
/* These globals are parameters to print_header, sigh. */
current_header = header;
- /* current_stat is already set up. */
current_format = archive_format;
- print_header ();
+ print_header (st, block_ordinal);
}
- set_next_block_after (header);
+ header = write_extended (st, header);
+ simple_finish_header (header);
}
\f
-/* Sparse file processing. */
-/* Takes a blockful of data and basically cruises through it to see if
- it's made *entirely* of zeros, returning a 0 the instant it finds
- something that is a nonzero, i.e., useful data. */
-static int
-zero_block_p (char *buffer)
+void
+pad_archive (off_t size_left)
{
- int counter;
-
- for (counter = 0; counter < BLOCKSIZE; counter++)
- if (buffer[counter] != '\0')
- return 0;
- return 1;
+ union block *blk;
+ while (size_left > 0)
+ {
+ save_sizeleft = size_left;
+ blk = find_next_block ();
+ memset (blk->buffer, 0, BLOCKSIZE);
+ set_next_block_after (blk);
+ size_left -= BLOCKSIZE;
+ }
}
-static void
-init_sparsearray (void)
+static enum dump_status
+dump_regular_file (int fd, struct tar_stat_info *st)
{
- sp_array_size = 10;
+ off_t size_left = st->stat.st_size;
+ off_t block_ordinal;
+ union block *blk;
- /* Make room for our scratch space -- initially is 10 elts long. */
+ block_ordinal = current_block_ordinal ();
+ blk = start_header (st);
+ if (!blk)
+ return dump_status_fail;
- sparsearray = xmalloc (sp_array_size * sizeof (struct sp_array));
-}
+ /* Mark contiguous files, if we support them. */
+ if (archive_format != V7_FORMAT && S_ISCTG (st->stat.st_mode))
+ blk->header.typeflag = CONTTYPE;
-static off_t
-find_new_file_size (int sparses)
-{
- int i;
- off_t s = 0;
- for (i = 0; i < sparses; i++)
- s += sparsearray[i].numbytes;
- return s;
-}
+ finish_header (st, blk, block_ordinal);
-/* Make one pass over the file NAME, studying where any non-zero data
- is, that is, how far into the file each instance of data is, and
- how many bytes are there. Save this information in the
- sparsearray, which will later be translated into header
- information. */
-
-/* There is little point in trimming small amounts of null data at the head
- and tail of blocks, only avoid dumping full null blocks. */
+ while (size_left > 0)
+ {
+ size_t bufsize, count;
-/* FIXME: this routine might accept bits of algorithmic cleanup, it is
- too kludgey for my taste... */
+ if (multi_volume_option)
+ {
+ assign_string (&save_name, st->orig_file_name);
+ save_sizeleft = size_left;
+ save_totsize = st->stat.st_size;
+ }
+ blk = find_next_block ();
-static int
-deal_with_sparse (char *name, union block *header)
-{
- size_t numbytes = 0;
- off_t offset = 0;
- int file;
- int sparses = 0;
- ssize_t count;
- char buffer[BLOCKSIZE];
+ bufsize = available_space_after (blk);
- if (archive_format == OLDGNU_FORMAT)
- header->oldgnu_header.isextended = 0;
+ if (size_left < bufsize)
+ {
+ /* Last read -- zero out area beyond. */
+ bufsize = size_left;
+ count = bufsize % BLOCKSIZE;
+ if (count)
+ memset (blk->buffer + size_left, 0, BLOCKSIZE - count);
+ }
- if (file = open (name, O_RDONLY), file < 0)
- /* This problem will be caught later on, so just return. */
- return 0;
+ count = (fd < 0) ? bufsize : safe_read (fd, blk->buffer, bufsize);
+ if (count == SAFE_READ_ERROR)
+ {
+ read_diag_details (st->orig_file_name,
+ st->stat.st_size - size_left, bufsize);
+ pad_archive (size_left);
+ return dump_status_short;
+ }
+ size_left -= count;
+ if (count)
+ set_next_block_after (blk + (bufsize - 1) / BLOCKSIZE);
- init_sparsearray ();
- clear_buffer (buffer);
+ if (count != bufsize)
+ {
+ char buf[UINTMAX_STRSIZE_BOUND];
+ memset (blk->buffer + count, 0, bufsize - count);
+ WARN ((0, 0,
+ ngettext ("%s: File shrank by %s byte; padding with zeros",
+ "%s: File shrank by %s bytes; padding with zeros",
+ size_left),
+ quotearg_colon (st->orig_file_name),
+ STRINGIFY_BIGINT (size_left, buf)));
+ if (! ignore_failed_read_option)
+ exit_status = TAREXIT_FAILURE;
+ pad_archive (size_left - (bufsize-count));
+ return dump_status_short;
+ }
+ }
+ return dump_status_ok;
+}
- for (;;)
+static void
+dump_regular_finish (int fd, struct tar_stat_info *st,
+ struct timespec original_ctime)
+{
+ if (fd >= 0)
{
- /* Realloc the scratch area as necessary. FIXME: should reallocate
- only at beginning of a new instance of non-zero data. */
-
- if (sp_array_size <= sparses)
+ struct stat final_stat;
+ if (fstat (fd, &final_stat) != 0)
+ {
+ stat_diag (st->orig_file_name);
+ }
+ else if (final_stat.st_ctime != original_ctime.tv_sec
+ || (get_stat_ctime (&final_stat).tv_nsec
+ != original_ctime.tv_nsec))
+ {
+ WARN ((0, 0, _("%s: file changed as we read it"),
+ quotearg_colon (st->orig_file_name)));
+ }
+ if (close (fd) != 0)
{
- sparsearray =
- xrealloc (sparsearray,
- 2 * sp_array_size * sizeof (struct sp_array));
- sp_array_size *= 2;
+ close_diag (st->orig_file_name);
}
-
- count = safe_read (file, buffer, sizeof buffer);
- if (count <= 0)
- break;
+ }
+ if (remove_files_option)
+ {
+ if (unlink (st->orig_file_name) == -1)
+ unlink_error (st->orig_file_name);
+ }
+}
- /* Process one block. */
+/* Look in directory DIRNAME for a cache directory tag file
+ with the magic name "CACHEDIR.TAG" and a standard header,
+ as described at:
+ http://www.brynosaurus.com/cachedir
+ Applications can write this file into directories they create
+ for use as caches containing purely regenerable, non-precious data,
+ allowing us to avoid archiving them if --exclude-caches is specified. */
- if (count == sizeof buffer)
+#define CACHEDIR_SIGNATURE "Signature: 8a477f597d28d172789f06886806bc55"
+#define CACHEDIR_SIGNATURE_SIZE (sizeof CACHEDIR_SIGNATURE - 1)
- if (zero_block_p (buffer))
- {
- if (numbytes)
- {
- sparsearray[sparses++].numbytes = numbytes;
- numbytes = 0;
- }
- }
- else
- {
- if (!numbytes)
- sparsearray[sparses].offset = offset;
- numbytes += count;
- }
+static bool
+check_cache_directory (char *dirname)
+{
+ static char tagname[] = "CACHEDIR.TAG";
+ char *tagpath;
+ int fd;
+ int tag_present = false;
- else
+ tagpath = xmalloc (strlen (dirname) + strlen (tagname) + 1);
+ strcpy (tagpath, dirname);
+ strcat (tagpath, tagname);
- /* Since count < sizeof buffer, we have the last bit of the file. */
+ fd = open (tagpath, O_RDONLY);
+ if (fd >= 0)
+ {
+ static char tagbuf[CACHEDIR_SIGNATURE_SIZE];
- if (!zero_block_p (buffer))
- {
- if (!numbytes)
- sparsearray[sparses].offset = offset;
- numbytes += count;
- }
- else
- /* The next two lines are suggested by Andreas Degert, who says
- they are required for trailing full blocks to be written to the
- archive, when all zeroed. Yet, it seems to me that the case
- does not apply. Further, at restore time, the file is not as
- sparse as it should. So, some serious cleanup is *also* needed
- in this area. Just one more... :-(. FIXME. */
- if (numbytes)
- numbytes += count;
-
- /* Prepare for next block. */
-
- offset += count;
- /* FIXME: do not clear unless necessary. */
- clear_buffer (buffer);
- }
+ if (read (fd, tagbuf, CACHEDIR_SIGNATURE_SIZE)
+ == CACHEDIR_SIGNATURE_SIZE
+ && memcmp (tagbuf, CACHEDIR_SIGNATURE, CACHEDIR_SIGNATURE_SIZE) == 0)
+ tag_present = true;
- if (numbytes)
- sparsearray[sparses++].numbytes = numbytes;
- else
- {
- sparsearray[sparses].offset = offset - 1;
- sparsearray[sparses++].numbytes = 1;
+ close (fd);
}
- return close (file) == 0 && 0 <= count ? sparses : 0;
+ free (tagpath);
+
+ return tag_present;
}
-static int
-finish_sparse_file (int file, off_t *sizeleft, off_t fullsize, char *name)
+static void
+dump_dir0 (char *directory,
+ struct tar_stat_info *st, int top_level, dev_t parent_device)
{
- union block *start;
- size_t bufsize;
- int sparses = 0;
- ssize_t count;
+ dev_t our_device = st->stat.st_dev;
- while (*sizeleft > 0)
+ if (!is_avoided_name (st->orig_file_name))
{
- start = find_next_block ();
- memset (start->buffer, 0, BLOCKSIZE);
- bufsize = sparsearray[sparses].numbytes;
- if (! bufsize)
- abort ();
+ union block *blk = NULL;
+ off_t block_ordinal = current_block_ordinal ();
+ st->stat.st_size = 0; /* force 0 size on dir */
- if (lseek (file, sparsearray[sparses++].offset, SEEK_SET) < 0)
- {
- (ignore_failed_read_option ? seek_warn_details : seek_error_details)
- (name, sparsearray[sparses - 1].offset);
- break;
- }
+ blk = start_header (st);
+ if (!blk)
+ return;
- /* If the number of bytes to be written here exceeds the size of
- the temporary buffer, do it in steps. */
+ if (incremental_option)
+ blk->header.typeflag = GNUTYPE_DUMPDIR;
+ else /* if (standard_option) */
+ blk->header.typeflag = DIRTYPE;
- while (bufsize > BLOCKSIZE)
+ /* If we're gnudumping, we aren't done yet so don't close it. */
+
+ if (!incremental_option)
+ finish_header (st, blk, block_ordinal);
+ else if (gnu_list_name->dir_contents)
{
- count = safe_read (file, start->buffer, BLOCKSIZE);
- if (count < 0)
+ off_t size_left;
+ off_t totsize;
+ size_t bufsize;
+ ssize_t count;
+ const char *buffer, *p_buffer;
+
+ block_ordinal = current_block_ordinal ();
+ buffer = gnu_list_name->dir_contents; /* FOO */
+ totsize = 0;
+ if (buffer)
+ for (p_buffer = buffer; *p_buffer; )
+ {
+ size_t size = strlen (p_buffer) + 1;
+ totsize += size;
+ p_buffer += size;
+ }
+ totsize++;
+ OFF_TO_CHARS (totsize, blk->header.size);
+ finish_header (st, blk, block_ordinal);
+ p_buffer = buffer;
+ size_left = totsize;
+ while (size_left > 0)
{
- (ignore_failed_read_option
- ? read_warn_details
- : read_error_details)
- (name, fullsize - *sizeleft, bufsize);
- return 1;
+ if (multi_volume_option)
+ {
+ assign_string (&save_name, st->orig_file_name);
+ save_sizeleft = size_left;
+ save_totsize = totsize;
+ }
+ blk = find_next_block ();
+ bufsize = available_space_after (blk);
+ if (size_left < bufsize)
+ {
+ bufsize = size_left;
+ count = bufsize % BLOCKSIZE;
+ if (count)
+ memset (blk->buffer + size_left, 0, BLOCKSIZE - count);
+ }
+ memcpy (blk->buffer, p_buffer, bufsize);
+ size_left -= bufsize;
+ p_buffer += bufsize;
+ set_next_block_after (blk + (bufsize - 1) / BLOCKSIZE);
}
- bufsize -= count;
- *sizeleft -= count;
- set_next_block_after (start);
- start = find_next_block ();
- memset (start->buffer, 0, BLOCKSIZE);
+ if (multi_volume_option)
+ assign_string (&save_name, 0);
+ return;
}
+ }
- {
- char buffer[BLOCKSIZE];
+ if (!recursion_option)
+ return;
+
+ if (one_file_system_option
+ && !top_level
+ && parent_device != st->stat.st_dev)
+ {
+ if (verbose_option)
+ WARN ((0, 0,
+ _("%s: file is on a different filesystem; not dumped"),
+ quotearg_colon (st->orig_file_name)));
+ return;
+ }
+
+ if (exclude_caches_option
+ && check_cache_directory(st->orig_file_name))
+ {
+ if (verbose_option)
+ WARN ((0, 0,
+ _("%s: contains a cache directory tag; not dumped"),
+ quotearg_colon (st->orig_file_name)));
+ return;
+ }
+
+ {
+ char const *entry;
+ size_t entry_len;
+ char *name_buf = xstrdup (st->orig_file_name);
+ size_t name_size = strlen (name_buf);
+ size_t name_len = name_size;
- clear_buffer (buffer);
- count = safe_read (file, buffer, bufsize);
- memcpy (start->buffer, buffer, BLOCKSIZE);
+ /* Now output all the files in the directory. */
+ /* FIXME: Should speed this up by cd-ing into the dir. */
+
+ for (entry = directory; (entry_len = strlen (entry)) != 0;
+ entry += entry_len + 1)
+ {
+ if (name_size < name_len + entry_len)
+ {
+ name_size = name_len + entry_len;
+ name_buf = xrealloc (name_buf, name_size + 1);
+ }
+ strcpy (name_buf + name_len, entry);
+ if (!excluded_name (name_buf))
+ dump_file (name_buf, 0, our_device);
}
- if (count < 0)
- {
- (ignore_failed_read_option
- ? read_warn_details
- : read_error_details)
- (name, fullsize - *sizeleft, bufsize);
- return 1;
- }
+ free (name_buf);
+ }
+}
+
+/* Ensure exactly one trailing slash. */
+static void
+ensure_slash (char **pstr)
+{
+ size_t len = strlen (*pstr);
+ while (len >= 1 && ISSLASH ((*pstr)[len - 1]))
+ len--;
+ if (!ISSLASH ((*pstr)[len]))
+ *pstr = xrealloc (*pstr, len + 2);
+ (*pstr)[len++] = '/';
+ (*pstr)[len] = '\0';
+}
+
+static bool
+dump_dir (struct tar_stat_info *st, int top_level, dev_t parent_device)
+{
+ char *directory;
- *sizeleft -= count;
- set_next_block_after (start);
+ directory = savedir (st->orig_file_name);
+ if (!directory)
+ {
+ savedir_diag (st->orig_file_name);
+ return false;
}
- free (sparsearray);
-#if 0
- set_next_block_after (start + (count - 1) / BLOCKSIZE);
-#endif
- return 0;
+
+ ensure_slash (&st->orig_file_name);
+ ensure_slash (&st->file_name);
+
+ dump_dir0 (directory, st, top_level, parent_device);
+
+ free (directory);
+ return true;
}
+
\f
/* Main functions of this module. */
char *p;
open_archive (ACCESS_WRITE);
+ xheader_write_global ();
if (incremental_option)
{
collect_and_sort_names ();
- while (p = name_from_list (), p)
+ while ((p = name_from_list ()) != NULL)
if (!excluded_name (p))
dump_file (p, -1, (dev_t) 0);
blank_name_list ();
- while (p = name_from_list (), p)
+ while ((p = name_from_list ()) != NULL)
if (!excluded_name (p))
{
size_t plen = strlen (p);
while ((buffer_size *=2 ) < plen + qlen)
continue;
buffer = xrealloc (buffer, buffer_size);
- }
+ }
strcpy (buffer + plen, q + 1);
dump_file (buffer, -1, (dev_t) 0);
}
}
else
{
- while (p = name_next (1), p)
+ while ((p = name_next (1)) != NULL)
if (!excluded_name (p))
dump_file (p, 1, (dev_t) 0);
}
/* Calculate the hash of a link. */
-static unsigned
-hash_link (void const *entry, unsigned n_buckets)
+static size_t
+hash_link (void const *entry, size_t n_buckets)
{
- struct link const *link = entry;
- return (uintmax_t) (link->dev ^ link->ino) % n_buckets;
+ struct link const *l = entry;
+ uintmax_t num = l->dev ^ l->ino;
+ return num % n_buckets;
}
/* Compare two links for equality. */
return ((link1->dev ^ link2->dev) | (link1->ino ^ link2->ino)) == 0;
}
+static void
+unknown_file_error (char *p)
+{
+ WARN ((0, 0, _("%s: Unknown file type; file ignored"),
+ quotearg_colon (p)));
+ if (!ignore_failed_read_option)
+ exit_status = TAREXIT_FAILURE;
+}
+
+\f
+/* Handling of hard links */
+
+/* Table of all non-directories that we've written so far. Any time
+ we see another, we check the table and avoid dumping the data
+ again if we've done it once already. */
+static Hash_table *link_table;
+
+/* Try to dump stat as a hard link to another file in the archive. If
+ succeeded returns true */
+static bool
+dump_hard_link (struct tar_stat_info *st)
+{
+ if (link_table && st->stat.st_nlink > 1)
+ {
+ struct link lp;
+ struct link *duplicate;
+ off_t block_ordinal;
+ union block *blk;
+
+ lp.ino = st->stat.st_ino;
+ lp.dev = st->stat.st_dev;
+
+ if ((duplicate = hash_lookup (link_table, &lp)))
+ {
+ /* We found a link. */
+ char const *link_name = safer_name_suffix (duplicate->name, true,
+ absolute_names_option);
+
+ duplicate->nlink--;
+
+ block_ordinal = current_block_ordinal ();
+ assign_string (&st->link_name, link_name);
+ if (NAME_FIELD_SIZE - (archive_format == OLDGNU_FORMAT)
+ < strlen (link_name))
+ write_long_link (st);
+
+ st->stat.st_size = 0;
+ blk = start_header (st);
+ if (!blk)
+ return true;
+ tar_copy_str (blk->header.linkname, link_name, NAME_FIELD_SIZE);
+
+ blk->header.typeflag = LNKTYPE;
+ finish_header (st, blk, block_ordinal);
+
+ if (remove_files_option && unlink (st->orig_file_name) != 0)
+ unlink_error (st->orig_file_name);
+
+ return true;
+ }
+ }
+ return false;
+}
+
+static void
+file_count_links (struct tar_stat_info *st)
+{
+ if (st->stat.st_nlink > 1)
+ {
+ struct link *duplicate;
+ struct link *lp = xmalloc (offsetof (struct link, name)
+ + strlen (st->orig_file_name) + 1);
+ lp->ino = st->stat.st_ino;
+ lp->dev = st->stat.st_dev;
+ lp->nlink = st->stat.st_nlink;
+ strcpy (lp->name, st->orig_file_name);
+
+ if (! ((link_table
+ || (link_table = hash_initialize (0, 0, hash_link,
+ compare_links, 0)))
+ && (duplicate = hash_insert (link_table, lp))))
+ xalloc_die ();
+
+ if (duplicate != lp)
+ abort ();
+ lp->nlink--;
+ }
+}
+
+/* For each dumped file, check if all its links were dumped. Emit
+ warnings if it is not so. */
+void
+check_links (void)
+{
+ struct link *lp;
+
+ if (!link_table)
+ return;
+
+ for (lp = hash_get_first (link_table); lp;
+ lp = hash_get_next (link_table, lp))
+ {
+ if (lp->nlink)
+ {
+ WARN ((0, 0, _("Missing links to %s.\n"), quote (lp->name)));
+ }
+ }
+}
+
+
/* Dump a single file, recursing on directories. P is the file name
to dump. TOP_LEVEL tells whether this is a top-level call; zero
- means no, positive means yes, and negative means an incremental
- dump. PARENT_DEVICE is the device of P's
- parent directory; it is examined only if TOP_LEVEL is zero.
-
- Set global CURRENT_STAT to stat output for this file. */
+ means no, positive means yes, and negative means the top level
+ of an incremental dump. PARENT_DEVICE is the device of P's
+ parent directory; it is examined only if TOP_LEVEL is zero. */
/* FIXME: One should make sure that for *every* path leading to setting
exit_status to failure, a clear diagnostic has been issued. */
-void
-dump_file (char *p, int top_level, dev_t parent_device)
+static void
+dump_file0 (struct tar_stat_info *st, char *p,
+ int top_level, dev_t parent_device)
{
union block *header;
char type;
- union block *exhdr;
- char save_typeflag;
- time_t original_ctime;
- struct utimbuf restore_times;
-
- /* FIXME: `header' might be used uninitialized in this
- function. Reported by Bruno Haible. */
+ struct timespec original_ctime;
+ struct timespec restore_times[2];
+ off_t block_ordinal = -1;
if (interactive_option && !confirm ("add", p))
return;
- if (deref_stat (dereference_option, p, ¤t_stat) != 0)
+ assign_string (&st->orig_file_name, p);
+ assign_string (&st->file_name,
+ safer_name_suffix (p, false, absolute_names_option));
+
+ if (deref_stat (dereference_option, p, &st->stat) != 0)
{
- if (ignore_failed_read_option)
- stat_warn (p);
- else
- stat_error (p);
+ stat_diag (p);
return;
}
-
- original_ctime = current_stat.st_ctime;
- restore_times.actime = current_stat.st_atime;
- restore_times.modtime = current_stat.st_mtime;
+ st->archive_file_size = st->stat.st_size;
+ original_ctime = get_stat_ctime (&st->stat);
+ restore_times[0] = get_stat_atime (&st->stat);
+ restore_times[1] = get_stat_mtime (&st->stat);
#ifdef S_ISHIDDEN
- if (S_ISHIDDEN (current_stat.st_mode))
+ if (S_ISHIDDEN (st->stat.st_mode))
{
char *new = (char *) alloca (strlen (p) + 2);
if (new)
#endif
/* See if we want only new files, and check if this one is too old to
- put in the archive. */
+ put in the archive.
- if ((0 < top_level || !incremental_option)
- && !S_ISDIR (current_stat.st_mode)
- && current_stat.st_mtime < newer_mtime_option
- && (!after_date_option || current_stat.st_ctime < newer_ctime_option))
+ This check is omitted if incremental_option is set *and* the
+ requested file is not explicitely listed in the command line. */
+
+ if (!(incremental_option && !is_individual_file (p))
+ && !S_ISDIR (st->stat.st_mode)
+ && OLDER_STAT_TIME (st->stat, m)
+ && (!after_date_option || OLDER_STAT_TIME (st->stat, c)))
{
- if (0 < top_level)
+ if (!incremental_option && verbose_option)
WARN ((0, 0, _("%s: file is unchanged; not dumped"),
quotearg_colon (p)));
- /* FIXME: recheck this return. */
return;
}
-#if !MSDOS
/* See if we are trying to dump the archive. */
-
- if (ar_dev && current_stat.st_dev == ar_dev && current_stat.st_ino == ar_ino)
+ if (sys_file_is_archive (st))
{
WARN ((0, 0, _("%s: file is the archive; not dumped"),
quotearg_colon (p)));
return;
}
-#endif
- if (S_ISDIR (current_stat.st_mode))
+ if (is_avoided_name (p))
+ return;
+ if (S_ISDIR (st->stat.st_mode))
{
- char *directory;
- char const *entry;
- size_t entrylen;
- char *namebuf;
- size_t buflen;
- size_t len;
- dev_t our_device = current_stat.st_dev;
-
- errno = 0;
-
- directory = savedir (p);
- if (! directory)
- {
- if (ignore_failed_read_option)
- savedir_warn (p);
- else
- savedir_error (p);
- return;
- }
-
- /* Build new prototype name. Ensure exactly one trailing slash. */
-
- len = strlen (p);
- buflen = len + NAME_FIELD_SIZE;
- namebuf = xmalloc (buflen + 1);
- memcpy (namebuf, p, len);
- while (len >= 1 && ISSLASH (namebuf[len - 1]))
- len--;
- namebuf[len++] = '/';
- namebuf[len] = '\0';
-
- if (! is_avoided_name (namebuf))
- {
- /* The condition above used to be "archive_format != V7_FORMAT".
- GNU tar was not writing directory blocks at all. Daniel Trinkle
- writes: ``All old versions of tar I have ever seen have
- correctly archived an empty directory. The really old ones I
- checked included HP-UX 7 and Mt. Xinu More/BSD. There may be
- some subtle reason for the exclusion that I don't know, but the
- current behavior is broken.'' I do not know those subtle
- reasons either, so until these are reported (anew?), just allow
- directory blocks to be written even with old archives. */
-
- current_stat.st_size = 0; /* force 0 size on dir */
-
- /* FIXME: If people could really read standard archives, this
- should be:
-
- header
- = start_header (standard_option ? p : namebuf, ¤t_stat);
-
- but since they'd interpret DIRTYPE blocks as regular
- files, we'd better put the / on the name. */
-
- header = start_header (namebuf, ¤t_stat);
-
- if (incremental_option)
- header->header.typeflag = GNUTYPE_DUMPDIR;
- else /* if (standard_option) */
- header->header.typeflag = DIRTYPE;
-
- /* If we're gnudumping, we aren't done yet so don't close it. */
-
- if (!incremental_option)
- finish_header (header); /* done with directory header */
- }
-
- if (incremental_option && gnu_list_name->dir_contents)
- {
- off_t sizeleft;
- off_t totsize;
- size_t bufsize;
- union block *start;
- ssize_t count;
- const char *buffer, *p_buffer;
-
- buffer = gnu_list_name->dir_contents; /* FOO */
- totsize = 0;
- for (p_buffer = buffer; p_buffer && *p_buffer;)
- {
- size_t tmp;
-
- tmp = strlen (p_buffer) + 1;
- totsize += tmp;
- p_buffer += tmp;
- }
- totsize++;
- OFF_TO_CHARS (totsize, header->header.size);
- finish_header (header);
- p_buffer = buffer;
- sizeleft = totsize;
- while (sizeleft > 0)
- {
- if (multi_volume_option)
- {
- assign_string (&save_name, p);
- save_sizeleft = sizeleft;
- save_totsize = totsize;
- }
- start = find_next_block ();
- bufsize = available_space_after (start);
- if (sizeleft < bufsize)
- {
- bufsize = sizeleft;
- count = bufsize % BLOCKSIZE;
- if (count)
- memset (start->buffer + sizeleft, 0, BLOCKSIZE - count);
- }
- memcpy (start->buffer, p_buffer, bufsize);
- sizeleft -= bufsize;
- p_buffer += bufsize;
- set_next_block_after (start + (bufsize - 1) / BLOCKSIZE);
- }
- if (multi_volume_option)
- assign_string (&save_name, 0);
- goto finish_dir;
- }
-
- /* See if we are about to recurse into a directory, and avoid doing
- so if the user wants that we do not descend into directories. */
-
- if (! recursion_option)
- goto finish_dir;
-
- /* See if we are crossing from one file system to another, and
- avoid doing so if the user only wants to dump one file system. */
-
- if (one_file_system_option && !top_level
- && parent_device != current_stat.st_dev)
- {
- if (verbose_option)
- WARN ((0, 0,
- _("%s: file is on a different filesystem; not dumped"),
- quotearg_colon (p)));
- goto finish_dir;
- }
-
- /* Now output all the files in the directory. */
-
- /* FIXME: Should speed this up by cd-ing into the dir. */
-
- for (entry = directory;
- (entrylen = strlen (entry)) != 0;
- entry += entrylen + 1)
- {
- if (buflen <= len + entrylen)
- {
- buflen = len + entrylen;
- namebuf = xrealloc (namebuf, buflen + 1);
- }
- strcpy (namebuf + len, entry);
- if (!excluded_name (namebuf))
- dump_file (namebuf, 0, our_device);
- }
-
- finish_dir:
-
- free (directory);
- free (namebuf);
+ dump_dir (st, top_level, parent_device);
if (atime_preserve_option)
- utime (p, &restore_times);
+ utimens (p, restore_times);
return;
}
- else if (is_avoided_name (p))
- return;
else
{
- /* Check for multiple links.
-
- We maintain a table of all such files that we've written so
- far. Any time we see another, we check the table and avoid
- dumping the data again if we've done it once already. */
-
- if (1 < current_stat.st_nlink)
- {
- static Hash_table *link_table;
- struct link *lp = xmalloc (sizeof *lp + strlen (p));
- struct link *dup;
- lp->ino = current_stat.st_ino;
- lp->dev = current_stat.st_dev;
- strcpy (lp->name, p);
-
- if (! ((link_table
- || (link_table = hash_initialize (0, 0, hash_link,
- compare_links, 0)))
- && (dup = hash_insert (link_table, lp))))
- xalloc_die ();
-
- if (dup != lp)
- {
- /* We found a link. */
- char const *link_name = dup->name;
-
- free (lp);
-
- if (NAME_FIELD_SIZE <= strlen (link_name))
- write_long (link_name, GNUTYPE_LONGLINK);
- assign_string (¤t_link_name, link_name);
-
- current_stat.st_size = 0;
- header = start_header (p, ¤t_stat);
- strncpy (header->header.linkname, link_name, NAME_FIELD_SIZE);
-
- /* Force null termination. */
- header->header.linkname[NAME_FIELD_SIZE - 1] = 0;
-
- header->header.typeflag = LNKTYPE;
- finish_header (header);
-
- /* FIXME: Maybe remove from table after all links found? */
-
- if (remove_files_option && unlink (p) != 0)
- unlink_error (p);
-
- /* We dumped it. */
- return;
- }
- }
+ /* Check for multiple links. */
+ if (dump_hard_link (st))
+ return;
/* This is not a link to a previously dumped file, so dump it. */
- if (S_ISREG (current_stat.st_mode)
- || S_ISCTG (current_stat.st_mode))
+ if (S_ISREG (st->stat.st_mode)
+ || S_ISCTG (st->stat.st_mode))
{
- int f; /* file descriptor */
- size_t bufsize;
- ssize_t count;
- off_t sizeleft;
- union block *start;
- int header_moved;
- char isextended = 0;
- int sparses = 0;
-
- header_moved = 0;
-
- if (sparse_option)
- {
- /* Check the size of the file against the number of blocks
- allocated for it, counting both data and indirect blocks.
- If there is a smaller number of blocks that would be
- necessary to accommodate a file of this size, this is safe
- to say that we have a sparse file: at least one of those
- blocks in the file is just a useless hole. For sparse
- files not having more hole blocks than indirect blocks, the
- sparseness will go undetected. */
-
- /* Bruno Haible sent me these statistics for Linux. It seems
- that some filesystems count indirect blocks in st_blocks,
- while others do not seem to:
-
- minix-fs tar: size=7205, st_blocks=18 and ST_NBLOCKS=18
- extfs tar: size=7205, st_blocks=18 and ST_NBLOCKS=18
- ext2fs tar: size=7205, st_blocks=16 and ST_NBLOCKS=16
- msdos-fs tar: size=7205, st_blocks=16 and ST_NBLOCKS=16
-
- Dick Streefland reports the previous numbers as misleading,
- because ext2fs use 12 direct blocks, while minix-fs uses only
- 6 direct blocks. Dick gets:
-
- ext2 size=20480 ls listed blocks=21
- minix size=20480 ls listed blocks=21
- msdos size=20480 ls listed blocks=20
-
- It seems that indirect blocks *are* included in st_blocks.
- The minix filesystem does not account for phantom blocks in
- st_blocks, so `du' and `ls -s' give wrong results. So, the
- --sparse option would not work on a minix filesystem. */
-
- if (ST_NBLOCKS (current_stat)
- < (current_stat.st_size / ST_NBLOCKSIZE
- + (current_stat.st_size % ST_NBLOCKSIZE != 0)))
- {
- int counter;
-
- header = start_header (p, ¤t_stat);
- header->header.typeflag = GNUTYPE_SPARSE;
- header_moved = 1;
-
- /* Call the routine that figures out the layout of the
- sparse file in question. SPARSES is the index of the
- first unused element of the "sparsearray," i.e.,
- the number of elements it needed to describe the file. */
-
- sparses = deal_with_sparse (p, header);
-
- /* See if we'll need an extended header later. */
-
- if (SPARSES_IN_OLDGNU_HEADER < sparses)
- header->oldgnu_header.isextended = 1;
-
- /* We store the "real" file size so we can show that in
- case someone wants to list the archive, i.e., tar tvf
- <file>. It might be kind of disconcerting if the
- shrunken file size was the one that showed up. */
-
- OFF_TO_CHARS (current_stat.st_size,
- header->oldgnu_header.realsize);
-
- /* This will be the new "size" of the file, i.e., the size
- of the file minus the blocks of holes that we're
- skipping over. */
-
- current_stat.st_size = find_new_file_size (sparses);
- OFF_TO_CHARS (current_stat.st_size, header->header.size);
-
- for (counter = 0;
- counter < sparses && counter < SPARSES_IN_OLDGNU_HEADER;
- counter++)
- {
- OFF_TO_CHARS (sparsearray[counter].offset,
- header->oldgnu_header.sp[counter].offset);
- SIZE_TO_CHARS (sparsearray[counter].numbytes,
- header->oldgnu_header.sp[counter].numbytes);
- }
- }
- }
-
- sizeleft = current_stat.st_size;
+ int fd;
+ enum dump_status status;
- /* Don't bother opening empty, world readable files. Also do not open
- files when archive is meant for /dev/null. */
-
- if (dev_null_output
- || (sizeleft == 0
- && MODE_R == (MODE_R & current_stat.st_mode)))
- f = -1;
- else
+ if (file_dumpable_p (st))
{
- f = open (p, O_RDONLY | O_BINARY);
- if (f < 0)
+ fd = open (st->orig_file_name,
+ O_RDONLY | O_BINARY);
+ if (fd < 0)
{
- if (! top_level && errno == ENOENT)
+ if (!top_level && errno == ENOENT)
WARN ((0, 0, _("%s: File removed before we read it"),
- quotearg_colon (p)));
+ quotearg_colon (st->orig_file_name)));
else
- (ignore_failed_read_option ? open_warn : open_error) (p);
+ open_diag (st->orig_file_name);
return;
}
}
+ else
+ fd = -1;
- /* If the file is sparse, we've already taken care of this. */
-
- if (!header_moved)
- header = start_header (p, ¤t_stat);
-
- /* Mark contiguous files, if we support them. */
-
- if (archive_format != V7_FORMAT && S_ISCTG (current_stat.st_mode))
- header->header.typeflag = CONTTYPE;
-
- isextended = header->oldgnu_header.isextended;
- save_typeflag = header->header.typeflag;
- finish_header (header);
- if (isextended)
- {
- int sparses_emitted = SPARSES_IN_OLDGNU_HEADER;
-
- for (;;)
- {
- int i;
- exhdr = find_next_block ();
- memset (exhdr->buffer, 0, BLOCKSIZE);
- for (i = 0;
- (i < SPARSES_IN_SPARSE_HEADER
- && sparses_emitted + i < sparses);
- i++)
- {
- SIZE_TO_CHARS (sparsearray[sparses_emitted + i].numbytes,
- exhdr->sparse_header.sp[i].numbytes);
- OFF_TO_CHARS (sparsearray[sparses_emitted + i].offset,
- exhdr->sparse_header.sp[i].offset);
- }
- set_next_block_after (exhdr);
- sparses_emitted += i;
- if (sparses == sparses_emitted)
- break;
- exhdr->sparse_header.isextended = 1;
- }
- }
- if (save_typeflag == GNUTYPE_SPARSE)
+ if (sparse_option && sparse_file_p (st))
{
- if (f < 0
- || finish_sparse_file (f, &sizeleft,
- current_stat.st_size, p))
- goto padit;
+ status = sparse_dump_file (fd, st);
+ if (status == dump_status_not_implemented)
+ status = dump_regular_file (fd, st);
}
else
- while (sizeleft > 0)
- {
- if (multi_volume_option)
- {
- assign_string (&save_name, p);
- save_sizeleft = sizeleft;
- save_totsize = current_stat.st_size;
- }
- start = find_next_block ();
-
- bufsize = available_space_after (start);
-
- if (sizeleft < bufsize)
- {
- /* Last read -- zero out area beyond. */
-
- bufsize = sizeleft;
- count = bufsize % BLOCKSIZE;
- if (count)
- memset (start->buffer + sizeleft, 0, BLOCKSIZE - count);
- }
- if (f < 0)
- count = bufsize;
- else
- count = safe_read (f, start->buffer, bufsize);
- if (count < 0)
- {
- (ignore_failed_read_option
- ? read_warn_details
- : read_error_details)
- (p, current_stat.st_size - sizeleft, bufsize);
- goto padit;
- }
- sizeleft -= bufsize;
-
- /* This is nonportable (the type of set_next_block_after's arg). */
-
- set_next_block_after (start + (bufsize - 1) / BLOCKSIZE);
-
-
- if (count != bufsize)
- {
- char buf[UINTMAX_STRSIZE_BOUND];
- memset (start->buffer + count, 0, bufsize - count);
- WARN ((0, 0,
- _("%s: File shrank by %s bytes; padding with zeros"),
- quotearg_colon (p),
- STRINGIFY_BIGINT (sizeleft, buf)));
- if (! ignore_failed_read_option)
- exit_status = TAREXIT_FAILURE;
- goto padit; /* short read */
- }
- }
+ status = dump_regular_file (fd, st);
- if (multi_volume_option)
- assign_string (&save_name, 0);
-
- if (f >= 0)
+ switch (status)
{
- struct stat final_stat;
- if (fstat (f, &final_stat) != 0)
- {
- if (ignore_failed_read_option)
- stat_warn (p);
- else
- stat_error (p);
- }
- else if (final_stat.st_ctime != original_ctime)
- {
- char const *qp = quotearg_colon (p);
- WARN ((0, 0, _("%s: file changed as we read it"), qp));
- if (! ignore_failed_read_option)
- exit_status = TAREXIT_FAILURE;
- }
- if (close (f) != 0)
- {
- if (ignore_failed_read_option)
- close_warn (p);
- else
- close_error (p);
- }
- if (atime_preserve_option)
- utime (p, &restore_times);
- }
- if (remove_files_option)
- {
- if (unlink (p) == -1)
- unlink_error (p);
- }
- return;
+ case dump_status_ok:
+ if (multi_volume_option)
+ assign_string (&save_name, 0);
+ dump_regular_finish (fd, st, original_ctime);
+ break;
+
+ case dump_status_short:
+ if (multi_volume_option)
+ assign_string (&save_name, 0);
+ close (fd);
+ break;
- /* File shrunk or gave error, pad out tape to match the size we
- specified in the header. */
+ case dump_status_fail:
+ close (fd);
+ return;
- padit:
- while (sizeleft > 0)
- {
- save_sizeleft = sizeleft;
- start = find_next_block ();
- memset (start->buffer, 0, BLOCKSIZE);
- set_next_block_after (start);
- sizeleft -= BLOCKSIZE;
- }
- if (multi_volume_option)
- assign_string (&save_name, 0);
- if (f >= 0)
- {
- close (f);
- if (atime_preserve_option)
- utime (p, &restore_times);
+ case dump_status_not_implemented:
+ abort ();
}
+
+ if (atime_preserve_option)
+ utimens (st->orig_file_name, restore_times);
+ file_count_links (st);
return;
}
#ifdef HAVE_READLINK
- else if (S_ISLNK (current_stat.st_mode))
+ else if (S_ISLNK (st->stat.st_mode))
{
char *buffer;
int size;
- size_t linklen = current_stat.st_size;
- if (linklen != current_stat.st_size || linklen + 1 == 0)
+ size_t linklen = st->stat.st_size;
+ if (linklen != st->stat.st_size || linklen + 1 == 0)
xalloc_die ();
buffer = (char *) alloca (linklen + 1);
size = readlink (p, buffer, linklen + 1);
if (size < 0)
{
- if (ignore_failed_read_option)
- readlink_warn (p);
- else
- readlink_error (p);
+ readlink_diag (p);
return;
}
buffer[size] = '\0';
- if (size >= NAME_FIELD_SIZE)
- write_long (buffer, GNUTYPE_LONGLINK);
- assign_string (¤t_link_name, buffer);
-
- current_stat.st_size = 0; /* force 0 size on symlink */
- header = start_header (p, ¤t_stat);
- strncpy (header->header.linkname, buffer, NAME_FIELD_SIZE);
- header->header.linkname[NAME_FIELD_SIZE - 1] = '\0';
+ assign_string (&st->link_name, buffer);
+ if (NAME_FIELD_SIZE - (archive_format == OLDGNU_FORMAT) < size)
+ write_long_link (st);
+
+ block_ordinal = current_block_ordinal ();
+ st->stat.st_size = 0; /* force 0 size on symlink */
+ header = start_header (st);
+ if (!header)
+ return;
+ tar_copy_str (header->header.linkname, buffer, NAME_FIELD_SIZE);
header->header.typeflag = SYMTYPE;
- finish_header (header); /* nothing more to do to it */
+ finish_header (st, header, block_ordinal);
+ /* nothing more to do to it */
+
if (remove_files_option)
{
if (unlink (p) == -1)
unlink_error (p);
}
+ file_count_links (st);
return;
}
#endif
- else if (S_ISCHR (current_stat.st_mode))
+ else if (S_ISCHR (st->stat.st_mode))
type = CHRTYPE;
- else if (S_ISBLK (current_stat.st_mode))
+ else if (S_ISBLK (st->stat.st_mode))
type = BLKTYPE;
- else if (S_ISFIFO (current_stat.st_mode))
+ else if (S_ISFIFO (st->stat.st_mode))
type = FIFOTYPE;
- else if (S_ISSOCK (current_stat.st_mode))
+ else if (S_ISSOCK (st->stat.st_mode))
{
WARN ((0, 0, _("%s: socket ignored"), quotearg_colon (p)));
return;
}
- else if (S_ISDOOR (current_stat.st_mode))
+ else if (S_ISDOOR (st->stat.st_mode))
{
WARN ((0, 0, _("%s: door ignored"), quotearg_colon (p)));
return;
}
else
- goto unknown;
+ {
+ unknown_file_error (p);
+ return;
+ }
}
if (archive_format == V7_FORMAT)
- goto unknown;
+ {
+ unknown_file_error (p);
+ return;
+ }
- current_stat.st_size = 0; /* force 0 size */
- header = start_header (p, ¤t_stat);
+ block_ordinal = current_block_ordinal ();
+ st->stat.st_size = 0; /* force 0 size */
+ header = start_header (st);
+ if (!header)
+ return;
header->header.typeflag = type;
if (type != FIFOTYPE)
{
- MAJOR_TO_CHARS (major (current_stat.st_rdev), header->header.devmajor);
- MINOR_TO_CHARS (minor (current_stat.st_rdev), header->header.devminor);
+ MAJOR_TO_CHARS (major (st->stat.st_rdev),
+ header->header.devmajor);
+ MINOR_TO_CHARS (minor (st->stat.st_rdev),
+ header->header.devminor);
}
- finish_header (header);
+ finish_header (st, header, block_ordinal);
if (remove_files_option)
{
if (unlink (p) == -1)
unlink_error (p);
}
- return;
+}
-unknown:
- WARN ((0, 0, _("%s: Unknown file type; file ignored"),
- quotearg_colon (p)));
- if (! ignore_failed_read_option)
- exit_status = TAREXIT_FAILURE;
+void
+dump_file (char *p, int top_level, dev_t parent_device)
+{
+ struct tar_stat_info st;
+ tar_stat_init (&st);
+ dump_file0 (&st, p, top_level, parent_device);
+ tar_stat_destroy (&st);
}
projects / chaz / tar / blobdiff