/* Extract files from a tar archive.
- Copyright (C) 1988, 92,93,94,96,97,98, 1999 Free Software Foundation, Inc.
+ Copyright 1988, 92,93,94,96,97,98, 1999 Free Software Foundation, Inc.
Written by John Gilmore, on 1985-11-19.
This program is free software; you can redistribute it and/or modify it
#include "system.h"
-#include <time.h>
-time_t time ();
-
#if HAVE_UTIME_H
# include <utime.h>
#else
#include "common.h"
-static time_t now; /* current time */
static int 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 0
-/* "Scratch" space to store the information about a sparse file before
- writing the info into the header or extended header. */
-struct sp_array *sparsearray;
-
-/* Number of elts storable in the sparsearray. */
-int sp_array_size = 10;
-#endif
-
struct delayed_set_stat
{
struct delayed_set_stat *next;
void
extr_init (void)
{
- now = time ((time_t *) 0);
we_are_root = geteuid () == 0;
+ same_permissions_option += we_are_root;
+ same_owner_option += we_are_root;
/* 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. */
newdir_umask = umask (0);
- if (same_permissions_option)
+ if (0 < same_permissions_option)
current_umask = 0;
else
{
static void
set_mode (char *file_name, struct stat *stat_info)
{
- /* We ought to force permission when -k is not selected, because if the
+ /* Do nothing unless we are restoring the original permissions.
+
+ We must force permission when -k and -U are not selected, because if the
file already existed, open or creat would save the permission bits from
the previously created file, ignoring the ones we specified.
- But with -k selected, we know *we* created this file, so the mode
+ But with -k or -U selected, we know *we* created this file, so the mode
bits were set by our open. If the file has abnormal mode bits, we must
chmod since writing or chown has probably reset them. If the file is
normal, we merely skip the chmod. This works because we did umask (0)
when -p, so umask will have left the specified mode alone. */
- if (!keep_old_files_option
- || (stat_info->st_mode & (S_ISUID | S_ISGID | S_ISVTX)))
+ if (0 < same_permissions_option
+ && ((!keep_old_files_option && !unlink_first_option)
+ || (stat_info->st_mode & (S_ISUID | S_ISGID | S_ISVTX))))
if (chmod (file_name, ~current_umask & stat_info->st_mode) < 0)
ERROR ((0, errno, _("%s: Cannot change mode to %04lo"),
file_name,
if (incremental_option)
utimbuf.actime = stat_info->st_atime;
else
- utimbuf.actime = now;
+ utimbuf.actime = start_time;
utimbuf.modtime = stat_info->st_mtime;
extract as the original owner. Or else, if we are running as a user,
leave the owner and group as they are, so we extract as that user. */
- if (we_are_root || same_owner_option)
+ if (0 < same_owner_option)
{
#if HAVE_LCHOWN
int status;
for (cursor = strchr (file_name, '/');
- cursor != NULL;
+ cursor;
cursor = strchr (cursor + 1, '/'))
{
/* Avoid mkdir of empty string, if leading or double '/'. */
if (status == 0)
{
- /* Fix ownership. */
-
- if (we_are_root)
- if (chown (file_name, current_stat.st_uid, current_stat.st_gid) < 0)
- ERROR ((0, errno,
- _("%s: Cannot change owner to uid %lu, gid %lu"),
- file_name,
- (unsigned long) current_stat.st_uid,
- (unsigned long) current_stat.st_gid));
-
print_for_mkdir (file_name, cursor - file_name,
~newdir_umask & MODE_RWX);
did_something = 1;
return did_something; /* tell them to retry if we made one */
}
+/*--------------------------------------------------------------------.
+| Unlink the destination, if we are supposed to do so. |
+| Return zero if extraction should not proceed. |
+`--------------------------------------------------------------------*/
+
+static int
+unlink_destination (char const *file_name)
+{
+ if (unlink_first_option
+ && !remove_any_file (file_name, recursive_unlink_option)
+ && errno != ENOENT)
+ {
+ ERROR ((0, errno, _("Cannot remove %s"), file_name));
+ return 0;
+ }
+
+ return 1;
+}
+
/*--------------------------------------------------------------------.
| Attempt repairing what went wrong with the extraction. Delete an |
| already existing file or create missing intermediate directories. |
switch (errno)
{
case EEXIST:
- /* Attempt deleting an existing file. However, with -k, just stay
+ /* Attempt deleting an existing file. However, with -k or -U, just stay
quiet. */
- if (keep_old_files_option)
+ if (keep_old_files_option || unlink_first_option)
return 0;
return remove_any_file (file_name, 0);
while (*sizeleft > 0)
{
union block *data_block = find_next_block ();
- if (data_block == NULL)
+ if (! data_block)
{
ERROR ((0, 0, _("Unexpected EOF on archive file")));
return;
*sizeleft -= count;
set_next_block_after (data_block);
data_block = find_next_block ();
+ if (! data_block)
+ {
+ ERROR ((0, 0, _("Unexpected EOF on archive file")));
+ return;
+ }
}
count = full_write (fd, data_block->buffer, written);
skipcrud = 0;
while (!absolute_names_option && CURRENT_FILE_NAME[0] == '/')
{
- static int warned_once = 0;
+ static int warned_once;
- skipcrud++; /* force relative path */
if (!warned_once)
{
warned_once = 1;
- WARN ((0, 0, _("\
-Removing leading `/' from absolute path names in the archive")));
+ WARN ((0, 0, _("Removing leading `/' from archive names")));
}
+ skipcrud++; /* force relative path */
}
/* Take a safety backup of a previously existing file. */
case GNUTYPE_SPARSE:
sp_array_size = 10;
- sparsearray = (struct sp_array *)
+ sparsearray =
xmalloc (sp_array_size * sizeof (struct sp_array));
for (counter = 0; counter < SPARSES_IN_OLDGNU_HEADER; counter++)
{
- sparsearray[counter].offset =
- OFF_FROM_OCT (current_header->oldgnu_header.sp[counter].offset);
- sparsearray[counter].numbytes =
- SIZE_FROM_OCT (current_header->oldgnu_header.sp[counter].numbytes);
+ struct sparse const *s = ¤t_header->oldgnu_header.sp[counter];
+ sparsearray[counter].offset = OFF_FROM_HEADER (s->offset);
+ sparsearray[counter].numbytes = SIZE_FROM_HEADER (s->numbytes);
if (!sparsearray[counter].numbytes)
break;
}
while (1)
{
exhdr = find_next_block ();
+ if (! exhdr)
+ {
+ ERROR ((0, 0, _("Unexpected EOF on archive file")));
+ return;
+ }
for (counter = 0; counter < SPARSES_IN_SPARSE_HEADER; counter++)
{
+ struct sparse const *s = &exhdr->sparse_header.sp[counter];
if (counter + ind > sp_array_size - 1)
{
/* Realloc the scratch area since we've run out of
room. */
sp_array_size *= 2;
- sparsearray = (struct sp_array *)
+ sparsearray =
xrealloc (sparsearray,
- sp_array_size * (sizeof (struct sp_array)));
+ sp_array_size * sizeof (struct sp_array));
}
- /* Compare to 0, or use !(int)..., for Pyramid's dumb
- compiler. */
- if (exhdr->sparse_header.sp[counter].numbytes == 0)
+ if (s->numbytes[0] == 0)
break;
sparsearray[counter + ind].offset =
- OFF_FROM_OCT (exhdr->sparse_header.sp[counter].offset);
+ OFF_FROM_HEADER (s->offset);
sparsearray[counter + ind].numbytes =
- SIZE_FROM_OCT (exhdr->sparse_header.sp[counter].numbytes);
+ SIZE_FROM_HEADER (s->numbytes);
}
if (!exhdr->sparse_header.isextended)
break;
/* FIXME: deal with protection issues. */
again_file:
- openflag = (keep_old_files_option ?
- O_BINARY | O_NDELAY | O_WRONLY | O_CREAT | O_EXCL :
- O_BINARY | O_NDELAY | O_WRONLY | O_CREAT | O_TRUNC)
+ openflag = (keep_old_files_option || unlink_first_option ?
+ O_WRONLY | O_BINARY | O_NONBLOCK | O_CREAT | O_EXCL :
+ O_WRONLY | O_BINARY | O_NONBLOCK | O_CREAT | O_TRUNC)
| ((typeflag == GNUTYPE_SPARSE) ? 0 : O_APPEND);
/* JK - The last | is a kludge to solve the problem the O_APPEND
goto extract_file;
}
- if (unlink_first_option)
- remove_any_file (CURRENT_FILE_NAME, recursive_unlink_option);
+ if (!unlink_destination (CURRENT_FILE_NAME))
+ {
+ if (current_header->oldgnu_header.isextended)
+ skip_extended_headers ();
+ skip_file (current_stat.st_size);
+ if (backup_option)
+ undo_last_backup ();
+ break;
+ }
#if O_CTG
/* Contiguous files (on the Masscomp) have to specify the size in
#else /* not O_CTG */
if (typeflag == CONTTYPE)
{
- static int conttype_diagnosed = 0;
+ static int conttype_diagnosed;
if (!conttype_diagnosed)
{
REAL interesting unless we do this. */
name_length_bis = strlen (CURRENT_FILE_NAME) + 1;
- name = (char *) xmalloc (name_length_bis);
+ name = xmalloc (name_length_bis);
memcpy (name, CURRENT_FILE_NAME, name_length_bis);
size = current_stat.st_size;
extract_sparse_file (fd, &size, current_stat.st_size, name);
worked. */
data_block = find_next_block ();
- if (data_block == NULL)
+ if (! data_block)
{
ERROR ((0, 0, _("Unexpected EOF on archive file")));
break; /* FIXME: What happens, then? */
}
if (multi_volume_option)
- assign_string (&save_name, NULL);
+ 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)
break;
-#ifdef S_ISLNK
- if (unlink_first_option)
- remove_any_file (CURRENT_FILE_NAME, recursive_unlink_option);
+#ifdef HAVE_SYMLINK
+ if (!unlink_destination (CURRENT_FILE_NAME))
+ break;
while (status = symlink (current_link_name, CURRENT_FILE_NAME),
status != 0)
}
break;
-#else /* not S_ISLNK */
+#else
{
- static int warned_once = 0;
+ static int warned_once;
if (!warned_once)
{
warned_once = 1;
- WARN ((0, 0, _("\
-Attempting extraction of symbolic links as hard links")));
+ WARN ((0, 0,
+ _("Attempting extraction of symbolic links as hard links")));
}
}
/* Fall through. */
-#endif /* not S_ISLNK */
+#endif
case LNKTYPE:
if (to_stdout_option)
break;
- if (unlink_first_option)
- remove_any_file (CURRENT_FILE_NAME, recursive_unlink_option);
+ if (!unlink_destination (CURRENT_FILE_NAME))
+ break;
again_link:
{
if (to_stdout_option)
break;
- if (unlink_first_option)
- remove_any_file (CURRENT_FILE_NAME, recursive_unlink_option);
+ if (!unlink_destination (CURRENT_FILE_NAME))
+ break;
status = mknod (CURRENT_FILE_NAME, current_stat.st_mode,
current_stat.st_rdev);
break;
#endif
-#ifdef S_ISFIFO
+#if HAVE_MKFIFO || defined mkfifo
case FIFOTYPE:
if (to_stdout_option)
break;
- if (unlink_first_option)
- remove_any_file (CURRENT_FILE_NAME, recursive_unlink_option);
+ if (!unlink_destination (CURRENT_FILE_NAME))
+ break;
while (status = mkfifo (CURRENT_FILE_NAME, current_stat.st_mode),
status != 0)
}
#if !MSDOS
- /* MSDOS does not associate timestamps with directories. In this
+ /* MSDOS does not associate time stamps with directories. In this
case, no need to try delaying their restoration. */
if (touch_option)
else
{
- data = ((struct delayed_set_stat *)
- xmalloc (sizeof (struct delayed_set_stat)));
+ data = xmalloc (sizeof (struct delayed_set_stat));
data->file_name = xstrdup (CURRENT_FILE_NAME);
data->stat_info = current_stat;
data->next = delayed_set_stat_head;
break;
case GNUTYPE_MULTIVOL:
- ERROR ((0, 0, _("\
-Cannot extract `%s' -- file is continued from another volume"),
+ ERROR ((0, 0,
+ _("Cannot extract `%s' -- file is continued from another volume"),
current_file_name));
skip_file (current_stat.st_size);
if (backup_option)
{
struct delayed_set_stat *data;
- while (delayed_set_stat_head != NULL)
+ while (delayed_set_stat_head)
{
data = delayed_set_stat_head;
delayed_set_stat_head = delayed_set_stat_head->next;
projects / chaz / tar / blobdiff