/* Extract files from a tar archive.
- Copyright 1988, 92,93,94,96,97,98,99, 2000 Free Software Foundation, Inc.
+
+ Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
+ 2001, 2003, 2004, 2005 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
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. */
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#include "system.h"
+#include <system.h>
#include <quotearg.h>
-#include <time.h>
-
-#if HAVE_UTIME_H
-# include <utime.h>
-#else
-struct utimbuf
- {
- long actime;
- long modtime;
- };
-#endif
+#include <utimens.h>
+#include <errno.h>
+#include <xgetcwd.h>
#include "common.h"
-int we_are_root; /* true if our effective uid == 0 */
+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) */
};
/* List of directories whose statuses we need to extract after we've
- finished extracting their subsidiary files. The head of the list
- has the longest name; each non-head element in the list is an
- ancestor (in the directory hierarchy) of the preceding element. */
+ 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;
size_t file_name_len;
mode_t invert_permissions;
enum permstatus permstatus;
+ bool after_symlinks;
char file_name[1];
};
/* The next delayed symbolic link in the list. */
struct delayed_symlink *next;
- /* The device, inode number and last-modified time of the
- placeholder symbolic link. */
+ /* The device, inode number and last-modified time of the placeholder. */
dev_t dev;
ino_t ino;
time_t mtime;
uid_t uid;
gid_t gid;
- /* The location and desired target of the desired link, as two
- adjacent character strings, both null-terminated. */
- char names[1];
+ /* 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;
- xalloc_fail_func = extract_finish;
+
+ /* 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 ();
+
+ if (deref_stat (true, dir, &st))
+ stat_diag (dir);
+ else
+ root_device = st.st_dev;
+ }
/* Option -p clears the kernel umask, so it does not affect proper
restoration of file permissions. New intermediate directories will
}
/* If restoring permissions, restore the mode for FILE_NAME from
- information given in *STAT_INFO; otherwise invert the
+ 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,
+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)
{
that we created, so there's no point optimizing this code for
other cases. */
struct stat st;
- if (stat (file_name, &st) != 0)
+ if (! cur_info)
{
- stat_error (file_name);
- return;
+ if (stat (file_name, &st) != 0)
+ {
+ stat_error (file_name);
+ return;
+ }
+ cur_info = &st;
}
- mode = st.st_mode ^ invert_permissions;
+ mode = cur_info->st_mode ^ invert_permissions;
}
if (chmod (file_name, mode) != 0)
/* Check time after successfully setting FILE_NAME's time stamp to T. */
static void
-check_time (char const *file_name, time_t t)
+check_time (char const *file_name, struct timespec t)
{
- time_t now;
- 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)));
+ if (t.tv_sec <= 0)
+ WARN ((0, 0, _("%s: implausibly old time stamp %s"),
+ file_name, tartime (t, true)));
+ else if (timespec_lt (start_time, t))
+ {
+ struct timespec now;
+ gettime (&now);
+ if (timespec_lt (now, t))
+ {
+ unsigned long int ds = t.tv_sec - now.tv_sec;
+ int dns = t.tv_nsec - now.tv_nsec;
+ char dnsbuf[sizeof ".FFFFFFFFF"];
+ if (dns < 0)
+ {
+ dns += 1000000000;
+ ds--;
+ }
+ code_ns_fraction (dns, dnsbuf);
+ WARN ((0, 0, _("%s: time stamp %s is %lu%s s in the future"),
+ file_name, tartime (t, true), ds, dnsbuf));
+ }
+ }
}
/* 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.
punt for the rest. Sigh! */
static void
-set_stat (char const *file_name, struct stat const *stat_info,
+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)
{
- struct utimbuf utimbuf;
-
if (typeflag != SYMTYPE)
{
/* We do the utime before the chmod because some versions of utime are
/* 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;
+ struct timespec ts[2];
+ ts[0] = incremental_option ? get_stat_atime (stat_info) : start_time;
+ ts[1] = get_stat_mtime (stat_info);
- if (utime (file_name, &utimbuf) < 0)
+ if (utimens (file_name, ts) != 0)
utime_error (file_name);
else
{
- check_time (file_name, stat_info->st_atime);
- check_time (file_name, stat_info->st_mtime);
+ check_time (file_name, ts[0]);
+ check_time (file_name, ts[1]);
}
}
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,
+ set_mode (file_name, stat_info, cur_info,
invert_permissions, permstatus, typeflag);
}
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,
+ set_mode (file_name, stat_info, 0,
invert_permissions, permstatus, typeflag);
}
}
mode_t invert_permissions, enum permstatus permstatus)
{
size_t file_name_len = strlen (file_name);
- struct delayed_set_stat *data = xmalloc (sizeof *data + file_name_len);
+ 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;
}
/* Update the delayed_set_stat info for an intermediate directory
- created on the path to DIR_NAME. The intermediate directory turned
- out to be the same as this directory, e.g. due trailing slash or
- ".." or symbolic links. *DIR_STAT_INFO is the status of the
- 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_name,
+repair_delayed_set_stat (char const *dir,
struct stat const *dir_stat_info)
{
struct delayed_set_stat *data;
if (st.st_dev == dir_stat_info->st_dev
&& st.st_ino == dir_stat_info->st_ino)
{
- data->stat_info = current_stat;
- data->invert_permissions = (MODE_RWX
- & (current_stat.st_mode ^ st.st_mode));
+ 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;
}
}
ERROR ((0, 0, _("%s: Unexpected inconsistency when making directory"),
- quotearg_colon (dir_name)));
+ quotearg_colon (dir)));
}
/* After a file/link/symlink/directory creation has failed, see if
static int
make_directories (char *file_name)
{
- char *cursor; /* points into path */
+ 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 = strchr (file_name, '/');
- cursor;
- cursor = strchr (cursor + 1, '/'))
+
+ for (cursor = cursor0; *cursor; cursor++)
{
+ if (! ISSLASH (*cursor))
+ continue;
+
/* Avoid mkdir of empty string, if leading or double '/'. */
- if (cursor == file_name || cursor[-1] == '/')
+ if (cursor == cursor0 || ISSLASH (cursor[-1]))
continue;
- /* Avoid mkdir where last part of path is "." or "..". */
+ /* Avoid mkdir where last part of file name is "." or "..". */
if (cursor[-1] == '.'
- && (cursor == file_name + 1 || cursor[-2] == '/'
+ && (cursor == cursor0 + 1 || ISSLASH (cursor[-2])
|| (cursor[-2] == '.'
- && (cursor == file_name + 2 || cursor[-3] == '/'))))
+ && (cursor == cursor0 + 2 || ISSLASH (cursor[-3])))))
continue;
- *cursor = '\0'; /* truncate the path there */
+ *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);
invert_permissions is zero, because
repair_delayed_set_stat may need to update the struct. */
delay_set_stat (file_name,
- ¤t_stat /* ignored */,
+ ¤t_stat_info.stat /* ignored */,
invert_permissions, INTERDIR_PERMSTATUS);
print_for_mkdir (file_name, cursor - file_name, mode);
*cursor = '/';
- if (errno == EEXIST
-#if MSDOS
- /* Turbo C mkdir gives a funny errno. */
- || errno == EACCES
-#endif
- )
- /* Directory already exists. */
+ 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. */
return did_something; /* tell them to retry if we made one */
}
-/* Prepare to extract a file.
- Return zero if extraction should not proceed. */
-
-static int
-prepare_to_extract (char const *file_name)
+static bool
+file_newer_p (const char *file_name, struct tar_stat_info *tar_stat)
{
- if (to_stdout_option)
- return 0;
+ struct stat st;
- if (old_files_option == UNLINK_FIRST_OLD_FILES
- && !remove_any_file (file_name, recursive_unlink_option)
- && errno && errno != ENOENT)
+ if (stat (file_name, &st))
{
- unlink_error (file_name);
- return 0;
+ stat_warn (file_name);
+ /* Be on the safe side: if the file does exist assume it is newer */
+ return errno != ENOENT;
}
-
- return 1;
+ if (!S_ISDIR (st.st_mode)
+ && st.st_mtime >= tar_stat->stat.st_mtime)
+ {
+ return true;
+ }
+ return false;
}
/* Attempt repairing what went wrong with the extraction. Delete an
static int
maybe_recoverable (char *file_name, int *interdir_made)
{
+ int e = errno;
+
if (*interdir_made)
return 0;
switch (old_files_option)
{
- default:
+ 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, 0);
+ int r = remove_any_file (file_name, ORDINARY_REMOVE_OPTION);
errno = EEXIST;
return r;
}
+
+ case UNLINK_FIRST_OLD_FILES:
+ break;
}
case ENOENT:
}
}
+/* 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
-extract_sparse_file (int fd, off_t *sizeleft, off_t totalsize, char *name)
+apply_nonancestor_delayed_set_stat (char const *file_name, bool after_symlinks)
{
- int sparse_ind = 0;
- size_t written;
- ssize_t count;
-
- /* assuming sizeleft is initially totalsize */
+ size_t file_name_len = strlen (file_name);
+ bool check_for_renamed_directories = 0;
- while (*sizeleft > 0)
+ while (delayed_set_stat_head)
{
- union block *data_block = find_next_block ();
- if (! data_block)
- {
- ERROR ((0, 0, _("Unexpected EOF in archive")));
- return;
- }
- if (lseek (fd, sparsearray[sparse_ind].offset, SEEK_SET) < 0)
+ 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;
+
+ if (check_for_renamed_directories)
{
- seek_error_details (name, sparsearray[sparse_ind].offset);
- return;
+ 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;
+ }
}
- written = sparsearray[sparse_ind++].numbytes;
- while (written > BLOCKSIZE)
+
+ if (! skip_this_one)
+ set_stat (data->file_name, &data->stat_info, cur_info,
+ data->invert_permissions, data->permstatus, DIRTYPE);
+
+ 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))
{
- count = full_write (fd, data_block->buffer, BLOCKSIZE);
- if (count < 0)
- write_error (name);
- written -= count;
- *sizeleft -= count;
- set_next_block_after (data_block);
- data_block = find_next_block ();
- if (! data_block)
+ struct stat st;
+ if (stat (file_name, &st) == 0)
{
- ERROR ((0, 0, _("Unexpected EOF in archive")));
- return;
+ if (interdir_made)
+ {
+ repair_delayed_set_stat (file_name, &st);
+ return 0;
+ }
+ if (S_ISDIR (st.st_mode))
+ {
+ mode = st.st_mode & ~ current_umask;
+ break;
+ }
}
+ errno = EEXIST;
}
- count = full_write (fd, data_block->buffer, written);
+ if (maybe_recoverable (file_name, &interdir_made))
+ continue;
- if (count < 0)
- write_error (name);
- else if (count != written)
+ if (errno != EEXIST)
{
- write_error_details (name, count, written);
- skip_file (*sizeleft);
+ mkdir_error (file_name);
+ return 1;
}
-
- written -= count;
- *sizeleft -= count;
- set_next_block_after (data_block);
+ break;
}
- free (sparsearray);
+ 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;
}
-/* Fix the statuses of all directories whose statuses need fixing, and
- which are not ancestors of FILE_NAME. */
-static void
-apply_nonancestor_delayed_set_stat (char const *file_name)
+
+static int
+open_output_file (char *file_name, int typeflag)
{
- size_t file_name_len = strlen (file_name);
+ 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;
- while (delayed_set_stat_head)
+#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)
{
- struct delayed_set_stat *data = delayed_set_stat_head;
- if (data->file_name_len < file_name_len
- && file_name[data->file_name_len]
- && (file_name[data->file_name_len] == '/'
- || file_name[data->file_name_len - 1] == '/')
- && memcmp (file_name, data->file_name, data->file_name_len) == 0)
- break;
- delayed_set_stat_head = data->next;
- set_stat (data->file_name, &data->stat_info,
- data->invert_permissions, data->permstatus, DIRTYPE);
- free (data);
+ static int conttype_diagnosed;
+
+ if (!conttype_diagnosed)
+ {
+ conttype_diagnosed = 1;
+ WARN ((0, 0, _("Extracting contiguous files as regular files")));
+ }
}
+ fd = open (file_name, openflag, mode);
+
+#endif /* not O_CTG */
+
+ return fd;
}
-/* Extract a file from the archive. */
-void
-extract_archive (void)
+static int
+extract_file (char *file_name, int typeflag)
{
- union block *data_block;
int fd;
+ off_t size;
+ union block *data_block;
int status;
- ssize_t sstatus;
- size_t name_length;
+ size_t count;
size_t written;
- int openflag;
- mode_t mode;
- off_t size;
- int skipcrud;
- int counter;
int interdir_made = 0;
- char typeflag;
- union block *exhdr;
-
-#define CURRENT_FILE_NAME (skipcrud + current_file_name)
-
- set_next_block_after (current_header);
- decode_header (current_header, ¤t_stat, ¤t_format, 1);
-
- if (interactive_option && !confirm ("extract", current_file_name))
- {
- skip_member ();
- return;
- }
-
- /* Print the block from current_header and current_stat. */
-
- if (verbose_option)
- print_header ();
- /* Check for fully specified file names and other atrocities. */
+ /* FIXME: deal with protection issues. */
- skipcrud = 0;
- if (! absolute_names_option)
+ if (to_stdout_option)
+ fd = STDOUT_FILENO;
+ else if (to_command_option)
{
- while (CURRENT_FILE_NAME[0] == '/')
+ fd = sys_exec_command (file_name, 'f', ¤t_stat_info);
+ if (fd < 0)
{
- static int warned_once;
-
- if (!warned_once)
- {
- warned_once = 1;
- WARN ((0, 0, _("Removing leading `/' from member names")));
- }
- skipcrud++; /* force relative path */
+ skip_member ();
+ return 0;
}
+ }
+ else
+ {
+ do
+ fd = open_output_file (file_name, typeflag);
+ while (fd < 0 && maybe_recoverable (file_name, &interdir_made));
- if (contains_dot_dot (CURRENT_FILE_NAME))
+ if (fd < 0)
{
- ERROR ((0, 0, _("%s: Member name contains `..'"),
- quotearg_colon (CURRENT_FILE_NAME)));
- skip_member ();
- return;
+ open_error (file_name);
+ return 1;
}
}
- apply_nonancestor_delayed_set_stat (CURRENT_FILE_NAME);
-
- /* Take a safety backup of a previously existing file. */
-
- if (backup_option && !to_stdout_option)
- if (!maybe_backup_file (CURRENT_FILE_NAME, 0))
+ 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; )
{
- int e = errno;
- ERROR ((0, e, _("%s: Was unable to backup this file"),
- quotearg_colon (CURRENT_FILE_NAME)));
- skip_member ();
- return;
- }
+ 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;
+ }
- /* Extract the archive entry according to its type. */
+ /* Locate data, determine max length writeable, write it,
+ block that we have used the data, then check if the write
+ worked. */
- typeflag = current_header->header.typeflag;
- switch (typeflag)
- {
- /* 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. */
+ data_block = find_next_block ();
+ if (! data_block)
+ {
+ ERROR ((0, 0, _("Unexpected EOF in archive")));
+ break; /* FIXME: What happens, then? */
+ }
- case GNUTYPE_SPARSE:
- sp_array_size = 10;
- sparsearray =
- xmalloc (sp_array_size * sizeof (struct sp_array));
+ written = available_space_after (data_block);
- for (counter = 0; counter < SPARSES_IN_OLDGNU_HEADER; counter++)
- {
- 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)
+ if (written > size)
+ written = size;
+ errno = 0;
+ count = full_write (fd, data_block->buffer, written);
+ size -= written;
+
+ 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;
- }
+ }
+ }
- if (current_header->oldgnu_header.isextended)
- {
- /* Read in the list of extended headers and translate them
- into the sparsearray as before. Note that this
- invalidates current_header. */
+ skip_file (size);
- /* static */ int ind = SPARSES_IN_OLDGNU_HEADER;
+ if (multi_volume_option)
+ assign_string (&save_name, 0);
- while (1)
- {
- exhdr = find_next_block ();
- if (! exhdr)
- {
- ERROR ((0, 0, _("Unexpected EOF in archive")));
- 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. */
+ /* 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. */
- sp_array_size *= 2;
- sparsearray =
- xrealloc (sparsearray,
- sp_array_size * sizeof (struct sp_array));
- }
- if (s->numbytes[0] == 0)
- break;
- sparsearray[counter + ind].offset =
- OFF_FROM_HEADER (s->offset);
- sparsearray[counter + ind].numbytes =
- SIZE_FROM_HEADER (s->numbytes);
- }
- if (!exhdr->sparse_header.isextended)
- break;
- else
- {
- ind += SPARSES_IN_SPARSE_HEADER;
- set_next_block_after (exhdr);
- }
- }
- set_next_block_after (exhdr);
- }
- /* Fall through. */
+ if (to_stdout_option)
+ return 0;
- case AREGTYPE:
- case REGTYPE:
- case CONTTYPE:
+ status = close (fd);
+ if (status < 0)
+ close_error (file_name);
- /* Appears to be a file. But BSD tar uses the convention that a slash
- suffix means a directory. */
+ 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);
- name_length = strlen (CURRENT_FILE_NAME);
- if (name_length && CURRENT_FILE_NAME[name_length - 1] == '/')
- goto really_dir;
+ return status;
+}
- /* FIXME: deal with protection issues. */
+static int
+extract_link (char *file_name, int typeflag)
+{
+ char const *link_name = safer_name_suffix (current_stat_info.link_name,
+ true, absolute_names_option);
+ int interdir_made = 0;
- again_file:
- openflag = (O_WRONLY | O_BINARY | O_CREAT
- | (old_files_option == OVERWRITE_OLD_FILES
- ? O_TRUNC
- : O_EXCL));
- mode = current_stat.st_mode & MODE_RWX & ~ current_umask;
+ do
+ {
+ struct stat st1, st2;
+ int e;
+ int status = link (link_name, file_name);
+ e = errno;
- if (to_stdout_option)
+ if (status == 0)
{
- fd = STDOUT_FILENO;
- goto extract_file;
+ 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 (! prepare_to_extract (CURRENT_FILE_NAME))
- {
- skip_member ();
- if (backup_option)
- undo_last_backup ();
- break;
- }
+ if (!(incremental_option && errno == EEXIST))
+ {
+ link_error (link_name, file_name);
+ return 1;
+ }
+ return 0;
+}
-#if O_CTG
- /* Contiguous files (on the Masscomp) have to specify the size in
- the open call that creates them. */
+static int
+extract_symlink (char *file_name, int typeflag)
+{
+#ifdef HAVE_SYMLINK
+ int status, fd;
+ int interdir_made = 0;
- if (typeflag == CONTTYPE)
- fd = open (CURRENT_FILE_NAME, openflag | O_CTG,
- mode, current_stat.st_size);
+ 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
- fd = open (CURRENT_FILE_NAME, openflag, mode);
+ 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;
-#else /* not O_CTG */
- if (typeflag == CONTTYPE)
- {
- static int conttype_diagnosed;
+ while ((fd = open (file_name, O_WRONLY | O_CREAT | O_EXCL, 0)) < 0)
+ if (! maybe_recoverable (file_name, &interdir_made))
+ break;
- if (!conttype_diagnosed)
+ status = -1;
+ if (fd < 0)
+ open_error (file_name);
+ else if (fstat (fd, &st) != 0)
+ {
+ stat_error (file_name);
+ close (fd);
+ }
+ else if (close (fd) != 0)
+ close_error (file_name);
+ else
+ {
+ 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))
{
- conttype_diagnosed = 1;
- WARN ((0, 0, _("Extracting contiguous files as regular files")));
+ 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);
}
- }
- fd = open (CURRENT_FILE_NAME, openflag, mode);
-#endif /* not O_CTG */
+ status = 0;
+ }
+ }
- if (fd < 0)
- {
- if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
- goto again_file;
+ return status;
- open_error (CURRENT_FILE_NAME);
- skip_member ();
- if (backup_option)
- undo_last_backup ();
- break;
- }
+#else
+ static int warned_once;
- extract_file:
- if (typeflag == GNUTYPE_SPARSE)
- {
- char *name;
- size_t name_length_bis;
-
- /* 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. */
-
- name_length_bis = strlen (CURRENT_FILE_NAME) + 1;
- 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);
- }
- else
- for (size = current_stat.st_size;
- size > 0;
- size -= written)
- {
- if (multi_volume_option)
- {
- assign_string (&save_name, current_file_name);
- save_totsize = current_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. */
-
- data_block = find_next_block ();
- if (! data_block)
- {
- ERROR ((0, 0, _("Unexpected EOF in archive")));
- break; /* FIXME: What happens, then? */
- }
-
- written = available_space_after (data_block);
-
- if (written > size)
- written = size;
- errno = 0;
- sstatus = full_write (fd, data_block->buffer, written);
-
- set_next_block_after ((union block *)
- (data_block->buffer + written - 1));
- if (sstatus == written)
- continue;
-
- /* Error in writing to file. Print it, skip to next file in
- archive. */
-
- write_error_details (CURRENT_FILE_NAME, sstatus, written);
- skip_file (size - written);
- break; /* still do the close, mod time, chmod, etc */
- }
+ 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 (multi_volume_option)
- assign_string (&save_name, 0);
+#if S_IFCHR || S_IFBLK
+static int
+extract_node (char *file_name, int typeflag)
+{
+ int status;
+ int interdir_made = 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. */
+ 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 (to_stdout_option)
- break;
+ if (status != 0)
+ mknod_error (file_name);
+ else
+ set_stat (file_name, ¤t_stat_info.stat, 0, 0, ARCHIVED_PERMSTATUS, typeflag);
+ return status;
+}
+#endif
- status = close (fd);
- if (status < 0)
- {
- close_error (CURRENT_FILE_NAME);
- if (backup_option)
- undo_last_backup ();
- }
+#if HAVE_MKFIFO || defined mkfifo
+static int
+extract_fifo (char *file_name, int typeflag)
+{
+ int status;
+ int interdir_made = 0;
- set_stat (CURRENT_FILE_NAME, ¤t_stat, 0,
- (old_files_option == OVERWRITE_OLD_FILES
- ? UNKNOWN_PERMSTATUS
- : ARCHIVED_PERMSTATUS),
- typeflag);
+ while ((status = mkfifo (file_name, current_stat_info.stat.st_mode)))
+ if (!maybe_recoverable (file_name, &interdir_made))
break;
- case SYMTYPE:
-#ifdef HAVE_SYMLINK
- if (! prepare_to_extract (CURRENT_FILE_NAME))
- break;
+ if (status == 0)
+ set_stat (file_name, ¤t_stat_info.stat, NULL, 0,
+ ARCHIVED_PERMSTATUS, typeflag);
+ else
+ mkfifo_error (file_name);
+ return status;
+}
+#endif
- if (absolute_names_option
- || (current_link_name[0] != '/'
- && ! contains_dot_dot (current_link_name)))
- {
- while (status = symlink (current_link_name, CURRENT_FILE_NAME),
- status != 0)
- if (!maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
- break;
+static int
+extract_mangle_wrapper (char *file_name, int typeflag)
+{
+ extract_mangle ();
+ return 0;
+}
- if (status == 0)
- set_stat (CURRENT_FILE_NAME, ¤t_stat, 0, 0, SYMTYPE);
- else
- symlink_error (current_link_name, CURRENT_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;
- while (fd = open (CURRENT_FILE_NAME, O_WRONLY | O_CREAT | O_EXCL, 0),
- fd < 0)
- if (! maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
- break;
+static int
+extract_failure (char *file_name, int typeflag)
+{
+ return 1;
+}
- status = -1;
- if (fd < 0)
- open_error (CURRENT_FILE_NAME);
- else if (fstat (fd, &st) != 0)
- {
- stat_error (CURRENT_FILE_NAME);
- close (fd);
- }
- else if (close (fd) != 0)
- close_error (CURRENT_FILE_NAME);
- else
- {
- size_t filelen = strlen (CURRENT_FILE_NAME);
- size_t linklen = strlen (current_link_name);
- struct delayed_symlink *p =
- xmalloc (sizeof *p + filelen + linklen + 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.st_uid;
- p->gid = current_stat.st_gid;
- memcpy (p->names, CURRENT_FILE_NAME, filelen + 1);
- memcpy (p->names + filelen + 1, current_link_name, linklen + 1);
- status = 0;
- }
- }
-
- if (status != 0 && backup_option)
- undo_last_backup ();
- break;
+typedef int (*tar_extractor_t) (char *file_name, int typeflag);
-#else
- {
- static int warned_once;
+\f
- if (!warned_once)
- {
- warned_once = 1;
- WARN ((0, 0,
- _("Attempting extraction of symbolic links as hard links")));
- }
- }
- typeflag = LNKTYPE;
- /* Fall through. */
-#endif
+/* Prepare to extract a file. Find extractor function.
+ Return zero if extraction should not proceed. */
- case LNKTYPE:
- if (! prepare_to_extract (CURRENT_FILE_NAME))
- break;
+static int
+prepare_to_extract (char const *file_name, int typeflag, tar_extractor_t *fun)
+{
+ int rc = 1;
- again_link:
- {
- struct stat st1, st2;
- int e;
+ if (EXTRACT_OVER_PIPE)
+ rc = 0;
- /* MSDOS does not implement links. However, djgpp's link() actually
- copies the file. */
- status = link (current_link_name, CURRENT_FILE_NAME);
+ /* Select the extractor */
+ switch (typeflag)
+ {
+ case GNUTYPE_SPARSE:
+ *fun = extract_file;
+ rc = 1;
+ break;
- if (status == 0)
- break;
- if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
- goto again_link;
+ 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
+ {
+ *fun = extract_file;
+ rc = 1;
+ }
+ break;
- if (incremental_option && errno == EEXIST)
- break;
- e = errno;
- if (stat (current_link_name, &st1) == 0
- && stat (CURRENT_FILE_NAME, &st2) == 0
- && st1.st_dev == st2.st_dev
- && st1.st_ino == st2.st_ino)
- break;
+ case SYMTYPE:
+ *fun = extract_symlink;
+ break;
- ERROR ((0, e, _("%s: Cannot link to %s"),
- quotearg_colon (CURRENT_FILE_NAME),
- quote (current_link_name)));
- if (backup_option)
- undo_last_backup ();
- }
+ case LNKTYPE:
+ *fun = extract_link;
break;
#if S_IFCHR
case CHRTYPE:
- current_stat.st_mode |= S_IFCHR;
- goto make_node;
+ current_stat_info.stat.st_mode |= S_IFCHR;
+ *fun = extract_node;
+ break;
#endif
#if S_IFBLK
case BLKTYPE:
- current_stat.st_mode |= S_IFBLK;
-#endif
-
-#if S_IFCHR || S_IFBLK
- make_node:
- if (! prepare_to_extract (CURRENT_FILE_NAME))
- break;
-
- status = mknod (CURRENT_FILE_NAME, current_stat.st_mode,
- current_stat.st_rdev);
- if (status != 0)
- {
- if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
- goto make_node;
- mknod_error (CURRENT_FILE_NAME);
- if (backup_option)
- undo_last_backup ();
- break;
- };
- set_stat (CURRENT_FILE_NAME, ¤t_stat, 0,
- ARCHIVED_PERMSTATUS, typeflag);
+ current_stat_info.stat.st_mode |= S_IFBLK;
+ *fun = extract_node;
break;
#endif
#if HAVE_MKFIFO || defined mkfifo
case FIFOTYPE:
- if (! prepare_to_extract (CURRENT_FILE_NAME))
- break;
-
- while (status = mkfifo (CURRENT_FILE_NAME, current_stat.st_mode),
- status != 0)
- if (!maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
- break;
-
- if (status == 0)
- set_stat (CURRENT_FILE_NAME, ¤t_stat, 0,
- ARCHIVED_PERMSTATUS, typeflag);
- else
- {
- mkfifo_error (CURRENT_FILE_NAME);
- if (backup_option)
- undo_last_backup ();
- }
+ *fun = extract_fifo;
break;
#endif
case DIRTYPE:
case GNUTYPE_DUMPDIR:
- name_length = strlen (CURRENT_FILE_NAME);
-
- really_dir:
- if (incremental_option)
- {
- /* Read the entry and delete files that aren't listed in the
- archive. */
-
- gnu_restore (skipcrud);
- }
- else if (typeflag == GNUTYPE_DUMPDIR)
- skip_member ();
-
- if (! prepare_to_extract (CURRENT_FILE_NAME))
- break;
-
- mode = ((current_stat.st_mode
- | (we_are_root ? 0 : MODE_WXUSR))
- & MODE_RWX);
-
- again_dir:
- status = mkdir (CURRENT_FILE_NAME, mode);
- if (status != 0)
- {
- if (errno == EEXIST && interdir_made)
- {
- struct stat st;
- if (stat (CURRENT_FILE_NAME, &st) == 0)
- {
- repair_delayed_set_stat (CURRENT_FILE_NAME, &st);
- break;
- }
- errno = EEXIST;
- }
-
- if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
- goto again_dir;
-
- if (errno != EEXIST || old_files_option == KEEP_OLD_FILES)
- {
- mkdir_error (CURRENT_FILE_NAME);
- if (backup_option)
- undo_last_backup ();
- break;
- }
- }
-
- if (status == 0
- || old_files_option == OVERWRITE_OLD_FILES)
- delay_set_stat (CURRENT_FILE_NAME, ¤t_stat,
- mode & ~ current_stat.st_mode,
- (status == 0
- ? ARCHIVED_PERMSTATUS
- : UNKNOWN_PERMSTATUS));
+ *fun = extract_dir;
break;
case GNUTYPE_VOLHDR:
if (verbose_option)
- fprintf (stdlis, _("Reading %s\n"), quote (current_file_name));
+ fprintf (stdlis, _("Reading %s\n"), quote (current_stat_info.file_name));
+ *fun = NULL;
break;
case GNUTYPE_NAMES:
- extract_mangle ();
+ *fun = extract_mangle_wrapper;
break;
case GNUTYPE_MULTIVOL:
ERROR ((0, 0,
_("%s: Cannot extract -- file is continued from another volume"),
- quotearg_colon (current_file_name)));
- skip_member ();
- if (backup_option)
- undo_last_backup ();
+ quotearg_colon (current_stat_info.file_name)));
+ *fun = extract_failure;
break;
case GNUTYPE_LONGNAME:
case GNUTYPE_LONGLINK:
- ERROR ((0, 0, _("Visible long name error")));
- skip_member ();
- if (backup_option)
- undo_last_backup ();
+ ERROR ((0, 0, _("Unexpected long name header")));
+ *fun = extract_failure;
break;
default:
WARN ((0, 0,
- _("%s: Unknown file type '%c', extracted as normal file"),
- quotearg_colon (CURRENT_FILE_NAME), typeflag));
- goto again_file;
+ _("%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;
+
+ switch (old_files_option)
+ {
+ case UNLINK_FIRST_OLD_FILES:
+ if (!remove_any_file (file_name,
+ recursive_unlink_option ? RECURSIVE_REMOVE_OPTION
+ : ORDINARY_REMOVE_OPTION)
+ && errno && errno != ENOENT)
+ {
+ unlink_error (file_name);
+ return 0;
+ }
+ 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;
+ }
+
+ return 1;
+}
+
+/* Extract a file from the archive. */
+void
+extract_archive (void)
+{
+ 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);
+
+ if (interactive_option && !confirm ("extract", current_stat_info.file_name))
+ {
+ skip_member ();
+ return;
+ }
+
+ /* Print the block from current_header and current_stat. */
+
+ if (verbose_option)
+ print_header (¤t_stat_info, -1);
+
+ file_name = safer_name_suffix (current_stat_info.file_name,
+ false, absolute_names_option);
+ if (strip_name_components)
+ {
+ size_t prefix_len = stripped_prefix_len (file_name, strip_name_components);
+ if (prefix_len == (size_t) -1)
+ {
+ skip_member ();
+ return;
+ }
+ file_name += prefix_len;
+ }
+
+ apply_nonancestor_delayed_set_stat (file_name, 0);
+
+ /* 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;
+ }
+
+ /* 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 ();
}
+ else
+ skip_member ();
-#undef CURRENT_FILE_NAME
}
/* Extract the symbolic links whose final extraction were delayed. */
static void
apply_delayed_symlinks (void)
{
- struct delayed_symlink *p;
- struct delayed_symlink *next;
+ struct delayed_symlink *ds;
- for (p = delayed_symlink_head; p; p = next)
+ for (ds = delayed_symlink_head; ds; )
{
- char const *file = p->names;
- struct stat st;
+ struct string_list *sources = ds->sources;
+ char const *valid_source = 0;
- /* Before doing anything, make sure the placeholder file is still
- there. If the placeholder isn't there, don't worry about it, as
- it may have been removed by a later extraction. */
- if (lstat (file, &st) == 0
- && st.st_dev == p->dev
- && st.st_ino == p->ino
- && st.st_mtime == p->mtime)
+ for (sources = ds->sources; sources; sources = sources->next)
{
- if (unlink (file) != 0)
- unlink_error (file);
- else
+ 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)
{
- char const *contents = file + strlen (file) + 1;
- if (symlink (contents, file) != 0)
- symlink_error (contents, file);
+ /* 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
{
- st.st_uid = p->uid;
- st.st_gid = p->gid;
- set_stat (file, &st, 0, 0, SYMTYPE);
+ valid_source = source;
+ st.st_uid = ds->uid;
+ st.st_gid = ds->gid;
+ set_stat (source, &st, 0, 0, 0, SYMTYPE);
}
}
}
- next = p->next;
- free (p);
+ 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;
void
extract_finish (void)
{
- /* Apply delayed symlinks last, so that they don't affect
- delayed directory status-setting. */
- apply_nonancestor_delayed_set_stat ("");
+ /* 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
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