/* Extract files from a tar archive.
Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
- 2001, 2003, 2004 Free Software Foundation, Inc.
+ 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
Written by John Gilmore, on 1985-11-19.
#include <system.h>
#include <quotearg.h>
+#include <utimens.h>
#include <errno.h>
#include <xgetcwd.h>
-#if HAVE_UTIME_H
-# include <utime.h>
-#else
-struct utimbuf
- {
- long actime;
- long modtime;
- };
-#endif
-
#include "common.h"
-bool 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. 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
+ represents an element where AFTER_LINKS is nonzero and [^D]
+ represents an element where AFTER_LINKS 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. */
size_t file_name_len;
mode_t invert_permissions;
enum permstatus permstatus;
- bool after_symlinks;
+ bool after_links;
char file_name[1];
};
static struct delayed_set_stat *delayed_set_stat_head;
-/* List of symbolic links whose creation we have delayed. */
-struct delayed_symlink
+/* List of links whose creation we have delayed. */
+struct delayed_link
{
- /* The next delayed symbolic link in the list. */
- struct delayed_symlink *next;
+ /* The next delayed link in the list. */
+ struct delayed_link *next;
/* The device, inode number and last-modified time of the placeholder. */
dev_t dev;
ino_t ino;
time_t mtime;
- /* The desired owner and group of the symbolic link. */
+ /* True if the link is symbolic. */
+ bool is_symlink;
+
+ /* The desired owner and group of the link, if it is a symlink. */
uid_t uid;
gid_t gid;
- /* A list of sources for this symlink. The sources are all to be
+ /* A list of sources for this link. The sources are all to be
hard-linked together. */
struct string_list *sources;
char target[1];
};
-static struct delayed_symlink *delayed_symlink_head;
+static struct delayed_link *delayed_link_head;
struct string_list
{
FIXME: Should the same be done after handling -C option ? */
if (one_file_system_option)
{
- struct stat st;
+ struct stat st;
char *dir = xgetcwd ();
if (deref_stat (true, dir, &st))
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
comply with umask at start of program. */
/* 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 (t <= 0)
+ if (t.tv_sec <= 0)
WARN ((0, 0, _("%s: implausibly old time stamp %s"),
- file_name, tartime (t)));
- else if (start_time < t && (now = time (0)) < t)
- WARN ((0, 0, _("%s: time stamp %s is %lu s in the future"),
- file_name, tartime (t), (unsigned long) (t - now)));
+ file_name, tartime (t, true)));
+ else if (timespec_cmp (start_time, t) < 0)
+ {
+ struct timespec now;
+ gettime (&now);
+ if (timespec_cmp (now, t) < 0)
+ {
+ 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
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, utimbuf.actime);
- check_time (file_name, utimbuf.modtime);
+ check_time (file_name, ts[0]);
+ check_time (file_name, ts[1]);
}
}
strcpy (data->file_name, file_name);
data->invert_permissions = invert_permissions;
data->permstatus = permstatus;
- data->after_symlinks = 0;
+ data->after_links = 0;
data->stat_info = *stat_info;
data->next = delayed_set_stat_head;
delayed_set_stat_head = data;
quotearg_colon (dir)));
}
-/* After a file/link/symlink/directory creation has failed, see if
+/* After a file/link/directory creation has failed, see if
it's because some required directory was not present, and if so,
create all required directories. Return non-zero if a directory
was created. */
}
/* Fix the statuses of all directories whose statuses need fixing, and
- which are not ancestors of FILE_NAME. If AFTER_SYMLINKS is
+ which are not ancestors of FILE_NAME. If AFTER_LINKS 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. */
+ links are applied. */
static void
-apply_nonancestor_delayed_set_stat (char const *file_name, bool after_symlinks)
+apply_nonancestor_delayed_set_stat (char const *file_name, bool after_links)
{
size_t file_name_len = strlen (file_name);
bool check_for_renamed_directories = 0;
struct stat st;
struct stat const *cur_info = 0;
- check_for_renamed_directories |= data->after_symlinks;
+ check_for_renamed_directories |= data->after_links;
- if (after_symlinks < data->after_symlinks
+ if (after_links < data->after_links
|| (data->file_name_len < file_name_len
&& file_name[data->file_name_len]
&& (ISSLASH (file_name[data->file_name_len])
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);
}
errno = EEXIST;
}
-
+
if (maybe_recoverable (file_name, &interdir_made))
continue;
-
+
if (errno != EEXIST)
{
mkdir_error (file_name);
}
break;
}
-
+
if (status == 0
|| old_files_option == DEFAULT_OLD_FILES
|| old_files_option == OVERWRITE_OLD_FILES)
fd = open (file_name, openflag, mode);
#endif /* not O_CTG */
-
+
return fd;
}
size_t count;
size_t written;
int interdir_made = 0;
-
+
/* FIXME: deal with protection issues. */
if (to_stdout_option)
do
fd = open_output_file (file_name, typeflag);
while (fd < 0 && maybe_recoverable (file_name, &interdir_made));
-
+
if (fd < 0)
{
open_error (file_name);
return 1;
}
}
-
+
if (current_stat_info.is_sparse)
sparse_extract_file (fd, ¤t_stat_info, &size);
else
/* 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)
{
}
written = available_space_after (data_block);
-
+
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)
break;
}
}
-
+
skip_file (size);
if (multi_volume_option)
typeflag);
return status;
-}
+}
+
+/* Create a placeholder file with name FILE_NAME, which will be
+ replaced after other extraction is done by a symbolic link if
+ IS_SYMLINK is true, and by a hard link otherwise. Set
+ *INTERDIR_MADE if an intermediate directory is made in the
+ process. */
+
+static int
+create_placeholder_file (char *file_name, bool is_symlink, int *interdir_made)
+{
+ int fd;
+ struct stat st;
+
+ while ((fd = open (file_name, O_WRONLY | O_CREAT | O_EXCL, 0)) < 0)
+ if (! maybe_recoverable (file_name, interdir_made))
+ break;
+
+ 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_link *p =
+ xmalloc (offsetof (struct delayed_link, target)
+ + strlen (current_stat_info.link_name)
+ + 1);
+ p->next = delayed_link_head;
+ delayed_link_head = p;
+ p->dev = st.st_dev;
+ p->ino = st.st_ino;
+ p->mtime = st.st_mtime;
+ p->is_symlink = is_symlink;
+ if (is_symlink)
+ {
+ 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_links
+ && 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))
+ {
+ do
+ {
+ h->after_links = 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_links);
+ }
+
+ return 0;
+ }
+
+ return -1;
+}
static int
extract_link (char *file_name, int typeflag)
{
- char const *link_name = safer_name_suffix (current_stat_info.link_name, true);
+ char const *link_name = safer_name_suffix (current_stat_info.link_name,
+ true, absolute_names_option);
int interdir_made = 0;
-
+
+ if (! absolute_names_option && contains_dot_dot (link_name))
+ return create_placeholder_file (file_name, false, &interdir_made);
+
do
{
struct stat st1, st2;
if (status == 0)
{
- struct delayed_symlink *ds = delayed_symlink_head;
+ struct delayed_link *ds = delayed_link_head;
if (ds && lstat (link_name, &st1) == 0)
for (; ds; ds = ds->next)
if (ds->dev == st1.st_dev
&& st1.st_dev == st2.st_dev
&& st1.st_ino == st2.st_ino))
return 0;
-
+
errno = e;
}
while (maybe_recoverable (file_name, &interdir_made));
return 1;
}
return 0;
-}
+}
static int
extract_symlink (char *file_name, int typeflag)
{
#ifdef HAVE_SYMLINK
- int status, fd;
+ int status;
int interdir_made = 0;
-
- if (absolute_names_option
- || ! (IS_ABSOLUTE_FILE_NAME (current_stat_info.link_name)
- || contains_dot_dot (current_stat_info.link_name)))
- {
- while ((status = symlink (current_stat_info.link_name, file_name)))
- if (!maybe_recoverable (file_name, &interdir_made))
- break;
- if (status == 0)
- set_stat (file_name, ¤t_stat_info.stat, 0, 0, 0, SYMTYPE);
- else
- symlink_error (current_stat_info.link_name, file_name);
- }
- else
- {
- /* This symbolic link is potentially dangerous. Don't
- create it now; instead, create a placeholder file, which
- will be replaced after other extraction is done. */
- struct stat st;
+ if (! absolute_names_option
+ && (IS_ABSOLUTE_FILE_NAME (current_stat_info.link_name)
+ || contains_dot_dot (current_stat_info.link_name)))
+ return create_placeholder_file (file_name, true, &interdir_made);
- while ((fd = open (file_name, O_WRONLY | O_CREAT | O_EXCL, 0)) < 0)
- if (! maybe_recoverable (file_name, &interdir_made))
- break;
-
- status = -1;
- if (fd < 0)
- open_error (file_name);
- else if (fstat (fd, &st) != 0)
- {
- 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))
- {
- do
- {
- h->after_symlinks = 1;
-
- if (stat (h->file_name, &st) != 0)
- stat_error (h->file_name);
- else
- {
- h->stat_info.st_dev = st.st_dev;
- h->stat_info.st_ino = st.st_ino;
- }
- }
- while ((h = h->next) && ! h->after_symlinks);
- }
-
- status = 0;
- }
- }
+ while ((status = symlink (current_stat_info.link_name, file_name)))
+ if (!maybe_recoverable (file_name, &interdir_made))
+ break;
+ if (status == 0)
+ set_stat (file_name, ¤t_stat_info.stat, 0, 0, 0, SYMTYPE);
+ else
+ symlink_error (current_stat_info.link_name, file_name);
return status;
#else
warned_once = 1;
WARN ((0, 0, _("Attempting extraction of symbolic links as hard links")));
}
- return extract_link (file_name, typeflag);
+ return extract_link (file_name, typeflag);
#endif
-}
+}
#if S_IFCHR || S_IFBLK
static int
{
int status;
int interdir_made = 0;
-
+
do
status = mknod (file_name, current_stat_info.stat.st_mode,
current_stat_info.stat.st_rdev);
while (status && maybe_recoverable (file_name, &interdir_made));
-
+
if (status != 0)
mknod_error (file_name);
else
{
int status;
int interdir_made = 0;
-
+
while ((status = mkfifo (file_name, current_stat_info.stat.st_mode)))
if (!maybe_recoverable (file_name, &interdir_made))
break;
else
mkfifo_error (file_name);
return status;
-}
+}
#endif
static int
return 0;
}
-
+
static int
extract_failure (char *file_name, int typeflag)
{
prepare_to_extract (char const *file_name, int typeflag, tar_extractor_t *fun)
{
int rc = 1;
-
+
if (EXTRACT_OVER_PIPE)
rc = 0;
*fun = extract_file;
rc = 1;
break;
-
+
case AREGTYPE:
case REGTYPE:
case CONTTYPE:
/* 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
+ if (!remove_any_file (file_name,
+ recursive_unlink_option ? RECURSIVE_REMOVE_OPTION
: ORDINARY_REMOVE_OPTION)
&& errno && errno != ENOENT)
{
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 (verbose_option)
print_header (¤t_stat_info, -1);
- file_name = safer_name_suffix (current_stat_info.file_name, false);
+ 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);
}
else
skip_member ();
-
+
}
/* Extract the symbolic links whose final extraction were delayed. */
static void
-apply_delayed_symlinks (void)
+apply_delayed_links (void)
{
- struct delayed_symlink *ds;
+ struct delayed_link *ds;
- for (ds = delayed_symlink_head; ds; )
+ for (ds = delayed_link_head; ds; )
{
struct string_list *sources = ds->sources;
char const *valid_source = 0;
struct stat st;
/* Make sure the placeholder file is still there. If not,
- don't create a symlink, as the placeholder was probably
+ don't create a link, as the placeholder was probably
removed by a later extraction. */
if (lstat (source, &st) == 0
&& st.st_dev == ds->dev
unlink_error (source);
else if (valid_source && link (valid_source, source) == 0)
;
+ else if (!ds->is_symlink)
+ {
+ if (link (ds->target, source) != 0)
+ link_error (ds->target, source);
+ }
else if (symlink (ds->target, source) != 0)
symlink_error (ds->target, source);
else
}
{
- struct delayed_symlink *next = ds->next;
+ struct delayed_link *next = ds->next;
free (ds);
ds = next;
}
}
- delayed_symlink_head = 0;
+ delayed_link_head = 0;
}
/* Finish the extraction of an archive. */
/* 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
+ /* Then, apply delayed links, so that they don't affect delayed
directory status-setting for ordinary directories. */
- apply_delayed_symlinks ();
+ apply_delayed_links ();
/* Finally, fix the status of directories that are ancestors
- of delayed symlinks. */
+ of delayed links. */
apply_nonancestor_delayed_set_stat ("", 1);
}
projects / chaz / tar / blobdiff