/* Extract files from a tar archive.
- Copyright (C) 1988, 1992, 1993, 1994, 1996, 1997, 1998, 1999, 2000,
- 2001, 2003 Free Software Foundation, Inc.
+ Copyright 1988, 1992-1994, 1996-2001, 2003-2007, 2010, 2012-2014 Free
+ Software Foundation, Inc.
- Written by John Gilmore, on 1985-11-19.
+ This file is part of GNU tar.
- This program is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any later
- version.
+ GNU tar is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
- Public License for more details.
+ GNU tar is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
- 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. */
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
-#include "system.h"
+ Written by John Gilmore, on 1985-11-19. */
+
+#include <system.h>
#include <quotearg.h>
#include <errno.h>
-
-#if HAVE_UTIME_H
-# include <utime.h>
-#else
-struct utimbuf
- {
- long actime;
- long modtime;
- };
-#endif
+#include <priv-set.h>
+#include <root-uid.h>
+#include <utimens.h>
#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) */
-/* Status of the permissions of a file that we are extracting. */
-enum permstatus
-{
- /* This file may have existed already; its permissions are unknown. */
- UNKNOWN_PERMSTATUS,
+#define ALL_MODE_BITS ((mode_t) ~ (mode_t) 0)
- /* This file was created using the permissions from the archive. */
- ARCHIVED_PERMSTATUS,
+#if ! HAVE_FCHMOD && ! defined fchmod
+# define fchmod(fd, mode) (errno = ENOSYS, -1)
+#endif
+#if ! HAVE_FCHOWN && ! defined fchown
+# define fchown(fd, uid, gid) (errno = ENOSYS, -1)
+#endif
- /* This is an intermediate directory; the archive did not specify
- its permissions. */
- INTERDIR_PERMSTATUS
-};
+/* Return true if an error number ERR means the system call is
+ supported in this case. */
+static bool
+implemented (int err)
+{
+ return ! (err == ENOSYS
+ || err == ENOTSUP
+ || (EOPNOTSUPP != ENOTSUP && err == EOPNOTSUPP));
+}
/* 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. */
struct delayed_set_stat
{
+ /* Next directory in list. */
struct delayed_set_stat *next;
- struct stat stat_info;
+
+ /* Metadata for this directory. */
+ dev_t dev;
+ ino_t ino;
+ mode_t mode; /* The desired mode is MODE & ~ current_umask. */
+ uid_t uid;
+ gid_t gid;
+ struct timespec atime;
+ struct timespec mtime;
+
+ /* An estimate of the directory's current mode, along with a mask
+ specifying which bits of this estimate are known to be correct.
+ If CURRENT_MODE_MASK is zero, CURRENT_MODE's value doesn't
+ matter. */
+ mode_t current_mode;
+ mode_t current_mode_mask;
+
+ /* This directory is an intermediate directory that was created
+ as an ancestor of some other directory; it was not mentioned
+ in the archive, so do not set its uid, gid, atime, or mtime,
+ and don't alter its mode outside of MODE_RWX. */
+ bool interdir;
+
+ /* Whether symbolic links should be followed when accessing the
+ directory. */
+ int atflag;
+
+ /* Do not set the status of this directory until after delayed
+ links are created. */
+ bool after_links;
+
+ /* Directory that the name is relative to. */
+ int change_dir;
+
+ /* extended attributes*/
+ char *cntx_name;
+ char *acls_a_ptr;
+ size_t acls_a_len;
+ char *acls_d_ptr;
+ size_t acls_d_len;
+ size_t xattr_map_size;
+ struct xattr_array *xattr_map;
+ /* Length and contents of name. */
size_t file_name_len;
- mode_t invert_permissions;
- enum permstatus permstatus;
- bool after_symlinks;
char file_name[1];
};
static struct delayed_set_stat *delayed_set_stat_head;
-/* List of symbolic links whose creation we have delayed. */
-struct delayed_symlink
+/* List of links whose creation we have delayed. */
+struct delayed_link
{
- /* The next delayed symbolic link in the list. */
- struct delayed_symlink *next;
-
- /* The device, inode number and last-modified time of the placeholder. */
+ /* The next delayed link in the list. */
+ struct delayed_link *next;
+
+ /* The device, inode number and birthtime of the placeholder.
+ birthtime.tv_nsec is negative if the birthtime is not available.
+ Don't use mtime as this would allow for false matches if some
+ other process removes the placeholder. Don't use ctime as
+ this would cause race conditions and other screwups, e.g.,
+ when restoring hard-linked symlinks. */
dev_t dev;
ino_t ino;
- time_t mtime;
+ struct timespec birthtime;
+
+ /* True if the link is symbolic. */
+ bool is_symlink;
- /* The desired owner and group of the symbolic link. */
+ /* The desired metadata, valid only the link is symbolic. */
+ mode_t mode;
uid_t uid;
gid_t gid;
+ struct timespec atime;
+ struct timespec mtime;
- /* A list of sources for this symlink. The sources are all to be
+ /* The directory that the sources and target are relative to. */
+ int change_dir;
+
+ /* A list of sources for this link. The sources are all to be
hard-linked together. */
struct string_list *sources;
+ /* SELinux context */
+ char *cntx_name;
+
+ /* ACLs */
+ char *acls_a_ptr;
+ size_t acls_a_len;
+ char *acls_d_ptr;
+ size_t acls_d_len;
+
+ size_t xattr_map_size;
+ struct xattr_array *xattr_map;
+
/* The desired target of the desired link. */
char target[1];
};
-static struct delayed_symlink *delayed_symlink_head;
+static struct delayed_link *delayed_link_head;
struct string_list
{
void
extr_init (void)
{
- we_are_root = geteuid () == 0;
+ we_are_root = geteuid () == ROOT_UID;
same_permissions_option += we_are_root;
same_owner_option += we_are_root;
- xalloc_fail_func = extract_finish;
/* Option -p clears the kernel umask, so it does not affect proper
restoration of file permissions. New intermediate directories will
umask (newdir_umask); /* restore the kernel umask */
current_umask = newdir_umask;
}
+
+ /* If the user wants to guarantee that everything is under one directory,
+ determine its name now and let it be created later. */
+ if (one_top_level_option && !one_top_level_dir)
+ {
+ char *base = base_name (archive_name_array[0]);
+
+ one_top_level_dir = strip_compression_suffix (base);
+ free (base);
+
+ if (!one_top_level_dir)
+ USAGE_ERROR ((0, 0, _("Cannot deduce top-level directory name; please set it explicitly with --one-top-level=DIR")));
+ }
}
-/* If restoring permissions, restore the mode for FILE_NAME from
- information given in *STAT_INFO (where *CUR_INFO gives
- the current status if CUR_INFO is nonzero); otherwise invert the
- INVERT_PERMISSIONS bits from the file's current permissions.
- PERMSTATUS specifies the status of the file's permissions.
- TYPEFLAG specifies the type of the file. */
-static void
-set_mode (char const *file_name,
- struct stat const *stat_info,
- struct stat const *cur_info,
- mode_t invert_permissions, enum permstatus permstatus,
- char typeflag)
+/* Use fchmod if possible, fchmodat otherwise. */
+static int
+fd_chmod (int fd, char const *file, mode_t mode, int atflag)
{
- mode_t mode;
-
- if (0 < same_permissions_option
- && permstatus != INTERDIR_PERMSTATUS)
+ if (0 <= fd)
{
- mode = stat_info->st_mode;
-
- /* If we created the file and it has a usual mode, then its mode
- is normally set correctly already. But on many hosts, some
- directories inherit the setgid bits from their parents, so we
- we must set directories' modes explicitly. */
- if (permstatus == ARCHIVED_PERMSTATUS
- && ! (mode & ~ MODE_RWX)
- && typeflag != DIRTYPE
- && typeflag != GNUTYPE_DUMPDIR)
- return;
+ int result = fchmod (fd, mode);
+ if (result == 0 || implemented (errno))
+ return result;
}
- else if (! invert_permissions)
- return;
- else
+ return fchmodat (chdir_fd, file, mode, atflag);
+}
+
+/* Use fchown if possible, fchownat otherwise. */
+static int
+fd_chown (int fd, char const *file, uid_t uid, gid_t gid, int atflag)
+{
+ if (0 <= fd)
{
- /* We must inspect a directory's current permissions, since the
- directory may have inherited its setgid bit from its parent.
+ int result = fchown (fd, uid, gid);
+ if (result == 0 || implemented (errno))
+ return result;
+ }
+ return fchownat (chdir_fd, file, uid, gid, atflag);
+}
- INVERT_PERMISSIONS happens to be nonzero only for directories
- that we created, so there's no point optimizing this code for
- other cases. */
- struct stat st;
- if (! cur_info)
+/* Use fstat if possible, fstatat otherwise. */
+static int
+fd_stat (int fd, char const *file, struct stat *st, int atflag)
+{
+ return (0 <= fd
+ ? fstat (fd, st)
+ : fstatat (chdir_fd, file, st, atflag));
+}
+
+/* Set the mode for FILE_NAME to MODE.
+ MODE_MASK specifies the bits of MODE that we care about;
+ thus if MODE_MASK is zero, do nothing.
+ If FD is nonnegative, it is a file descriptor for the file.
+ CURRENT_MODE and CURRENT_MODE_MASK specify information known about
+ the file's current mode, using the style of struct delayed_set_stat.
+ TYPEFLAG specifies the type of the file.
+ ATFLAG specifies the flag to use when statting the file. */
+static void
+set_mode (char const *file_name,
+ mode_t mode, mode_t mode_mask, int fd,
+ mode_t current_mode, mode_t current_mode_mask,
+ char typeflag, int atflag)
+{
+ if (((current_mode ^ mode) | ~ current_mode_mask) & mode_mask)
+ {
+ if (MODE_ALL & ~ mode_mask & ~ current_mode_mask)
{
- if (stat (file_name, &st) != 0)
+ struct stat st;
+ if (fd_stat (fd, file_name, &st, atflag) != 0)
{
stat_error (file_name);
return;
}
- cur_info = &st;
+ current_mode = st.st_mode;
}
- mode = cur_info->st_mode ^ invert_permissions;
- }
- if (chmod (file_name, mode) != 0)
- chmod_error_details (file_name, mode);
+ current_mode &= MODE_ALL;
+ mode = (current_mode & ~ mode_mask) | (mode & mode_mask);
+
+ if (current_mode != mode)
+ {
+ int chmod_errno =
+ fd_chmod (fd, file_name, mode, atflag) == 0 ? 0 : errno;
+
+ /* On Solaris, chmod may fail if we don't have PRIV_ALL, because
+ setuid-root files would otherwise be a backdoor. See
+ http://opensolaris.org/jive/thread.jspa?threadID=95826
+ (2009-09-03). */
+ if (chmod_errno == EPERM && (mode & S_ISUID)
+ && priv_set_restore_linkdir () == 0)
+ {
+ chmod_errno =
+ fd_chmod (fd, file_name, mode, atflag) == 0 ? 0 : errno;
+ priv_set_remove_linkdir ();
+ }
+
+ /* Linux fchmodat does not support AT_SYMLINK_NOFOLLOW, and
+ returns ENOTSUP even when operating on non-symlinks, try
+ again with the flag disabled if it does not appear to be
+ supported and if the file is not a symlink. This
+ introduces a race, alas. */
+ if (atflag && typeflag != SYMTYPE && ! implemented (chmod_errno))
+ chmod_errno = fd_chmod (fd, file_name, mode, 0) == 0 ? 0 : errno;
+
+ if (chmod_errno
+ && (typeflag != SYMTYPE || implemented (chmod_errno)))
+ {
+ errno = chmod_errno;
+ chmod_error_details (file_name, mode);
+ }
+ }
+ }
}
/* 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)
- 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)));
+ if (t.tv_sec < 0)
+ WARNOPT (WARN_TIMESTAMP,
+ (0, 0, _("%s: implausibly old time stamp %s"),
+ file_name, tartime (t, true)));
+ else if (timespec_cmp (volume_start_time, t) < 0)
+ {
+ struct timespec now;
+ gettime (&now);
+ if (timespec_cmp (now, t) < 0)
+ {
+ char buf[TIMESPEC_STRSIZE_BOUND];
+ struct timespec diff;
+ diff.tv_sec = t.tv_sec - now.tv_sec;
+ diff.tv_nsec = t.tv_nsec - now.tv_nsec;
+ if (diff.tv_nsec < 0)
+ {
+ diff.tv_nsec += BILLION;
+ diff.tv_sec--;
+ }
+ WARNOPT (WARN_TIMESTAMP,
+ (0, 0, _("%s: time stamp %s is %s s in the future"),
+ file_name, tartime (t, true), code_timespec (diff, buf)));
+ }
+ }
}
/* Restore stat attributes (owner, group, mode and times) for
- FILE_NAME, using information given in *STAT_INFO.
- If CUR_INFO is nonzero, *CUR_INFO is the
- file's currernt status.
- If not restoring permissions, invert the
- INVERT_PERMISSIONS bits from the file's current permissions.
- PERMSTATUS specifies the status of the file's permissions.
- TYPEFLAG specifies the type of the file. */
-
-/* FIXME: About proper restoration of symbolic link attributes, we still do
- not have it right. Pretesters' reports tell us we need further study and
- probably more configuration. For now, just use lchown if it exists, and
- punt for the rest. Sigh! */
+ FILE_NAME, using information given in *ST.
+ If FD is nonnegative, it is a file descriptor for the file.
+ CURRENT_MODE and CURRENT_MODE_MASK specify information known about
+ the file's current mode, using the style of struct delayed_set_stat.
+ TYPEFLAG specifies the type of the file.
+ If INTERDIR, this is an intermediate directory.
+ ATFLAG specifies the flag to use when statting the file. */
static void
set_stat (char const *file_name,
- struct stat const *stat_info,
- struct stat const *cur_info,
- mode_t invert_permissions, enum permstatus permstatus,
- char typeflag)
+ struct tar_stat_info const *st,
+ int fd, mode_t current_mode, mode_t current_mode_mask,
+ char typeflag, bool interdir, int atflag)
{
- struct utimbuf utimbuf;
+ /* Do the utime before the chmod because some versions of utime are
+ broken and trash the modes of the file. */
- if (typeflag != SYMTYPE)
+ if (! touch_option && ! interdir)
{
- /* We do the utime before the chmod because some versions of utime are
- broken and trash the modes of the file. */
+ struct timespec ts[2];
+ if (incremental_option)
+ ts[0] = st->atime;
+ else
+ ts[0].tv_nsec = UTIME_OMIT;
+ ts[1] = st->mtime;
- if (! touch_option && permstatus != INTERDIR_PERMSTATUS)
+ if (fdutimensat (fd, chdir_fd, file_name, ts, atflag) == 0)
{
- /* We set the accessed time to `now', which is really the time we
- started extracting files, unless incremental_option is used, in
- which case .st_atime is used. */
-
- /* FIXME: incremental_option should set ctime too, but how? */
-
if (incremental_option)
- utimbuf.actime = stat_info->st_atime;
- else
- utimbuf.actime = start_time;
-
- utimbuf.modtime = stat_info->st_mtime;
-
- if (utime (file_name, &utimbuf) < 0)
- utime_error (file_name);
- else
- {
- check_time (file_name, utimbuf.actime);
- check_time (file_name, utimbuf.modtime);
- }
+ check_time (file_name, ts[0]);
+ check_time (file_name, ts[1]);
}
+ else if (typeflag != SYMTYPE || implemented (errno))
+ utime_error (file_name);
+ }
+ if (0 < same_owner_option && ! interdir)
+ {
/* Some systems allow non-root users to give files away. Once this
- done, it is not possible anymore to change file permissions, so we
- have to set permissions prior to possibly giving files away. */
-
- set_mode (file_name, stat_info, cur_info,
- invert_permissions, permstatus, typeflag);
+ done, it is not possible anymore to change file permissions.
+ However, setting file permissions now would be incorrect, since
+ they would apply to the wrong user, and there would be a race
+ condition. So, don't use systems that allow non-root users to
+ give files away. */
+ uid_t uid = st->stat.st_uid;
+ gid_t gid = st->stat.st_gid;
+
+ if (fd_chown (fd, file_name, uid, gid, atflag) == 0)
+ {
+ /* Changing the owner can clear st_mode bits in some cases. */
+ if ((current_mode | ~ current_mode_mask) & S_IXUGO)
+ current_mode_mask &= ~ (current_mode & (S_ISUID | S_ISGID));
+ }
+ else if (typeflag != SYMTYPE || implemented (errno))
+ chown_error_details (file_name, uid, gid);
}
- if (0 < same_owner_option && permstatus != INTERDIR_PERMSTATUS)
+ set_mode (file_name,
+ st->stat.st_mode & ~ current_umask,
+ 0 < same_permissions_option && ! interdir ? MODE_ALL : MODE_RWX,
+ fd, current_mode, current_mode_mask, typeflag, atflag);
+
+ /* these three calls must be done *after* fd_chown() call because fd_chown
+ causes that linux capabilities becomes cleared. */
+ xattrs_xattrs_set (st, file_name, typeflag, 1);
+ xattrs_acls_set (st, file_name, typeflag);
+ xattrs_selinux_set (st, file_name, typeflag);
+}
+
+/* For each entry H in the leading prefix of entries in HEAD that do
+ not have after_links marked, mark H and fill in its dev and ino
+ members. Assume HEAD && ! HEAD->after_links. */
+static void
+mark_after_links (struct delayed_set_stat *head)
+{
+ struct delayed_set_stat *h = head;
+
+ do
{
- /* When lchown exists, it should be used to change the attributes of
- the symbolic link itself. In this case, a mere chown would change
- the attributes of the file the symbolic link is pointing to, and
- should be avoided. */
+ struct stat st;
+ h->after_links = 1;
- if (typeflag == SYMTYPE)
- {
-#if HAVE_LCHOWN
- if (lchown (file_name, stat_info->st_uid, stat_info->st_gid) < 0)
- chown_error_details (file_name,
- stat_info->st_uid, stat_info->st_gid);
-#endif
- }
+ if (deref_stat (h->file_name, &st) != 0)
+ stat_error (h->file_name);
else
{
- if (chown (file_name, stat_info->st_uid, stat_info->st_gid) < 0)
- chown_error_details (file_name,
- stat_info->st_uid, stat_info->st_gid);
-
- /* On a few systems, and in particular, those allowing to give files
- away, changing the owner or group destroys the suid or sgid bits.
- So let's attempt setting these bits once more. */
- if (stat_info->st_mode & (S_ISUID | S_ISGID | S_ISVTX))
- set_mode (file_name, stat_info, 0,
- invert_permissions, permstatus, typeflag);
+ h->dev = st.st_dev;
+ h->ino = st.st_ino;
}
}
+ while ((h = h->next) && ! h->after_links);
}
/* Remember to restore stat attributes (owner, group, mode and times)
- for the directory FILE_NAME, using information given in *STAT_INFO,
+ for the directory FILE_NAME, using information given in *ST,
once we stop extracting files into that directory.
- If not restoring permissions, remember to invert the
- INVERT_PERMISSIONS bits from the file's current permissions.
- PERMSTATUS specifies the status of the file's permissions. */
+
+ If ST is null, merely create a placeholder node for an intermediate
+ directory that was created by make_directories.
+
+ NOTICE: this works only if the archive has usual member order, i.e.
+ directory, then the files in that directory. Incremental archive have
+ somewhat reversed order: first go subdirectories, then all other
+ members. To help cope with this case the variable
+ delay_directory_restore_option is set by prepare_to_extract.
+
+ If an archive was explicitely created so that its member order is
+ reversed, some directory timestamps can be restored incorrectly,
+ e.g.:
+ tar --no-recursion -cf archive dir dir/file1 foo dir/file2
+*/
static void
-delay_set_stat (char const *file_name, struct stat const *stat_info,
- mode_t invert_permissions, enum permstatus permstatus)
+delay_set_stat (char const *file_name, struct tar_stat_info const *st,
+ mode_t current_mode, mode_t current_mode_mask,
+ mode_t mode, int atflag)
{
size_t file_name_len = strlen (file_name);
struct delayed_set_stat *data =
xmalloc (offsetof (struct delayed_set_stat, file_name)
+ file_name_len + 1);
+ data->next = delayed_set_stat_head;
+ data->mode = mode;
+ if (st)
+ {
+ data->dev = st->stat.st_dev;
+ data->ino = st->stat.st_ino;
+ data->uid = st->stat.st_uid;
+ data->gid = st->stat.st_gid;
+ data->atime = st->atime;
+ data->mtime = st->mtime;
+ }
data->file_name_len = file_name_len;
+ data->current_mode = current_mode;
+ data->current_mode_mask = current_mode_mask;
+ data->interdir = ! st;
+ data->atflag = atflag;
+ data->after_links = 0;
+ data->change_dir = chdir_current;
+ data->cntx_name = NULL;
+ if (st)
+ assign_string (&data->cntx_name, st->cntx_name);
+ if (st && st->acls_a_ptr)
+ {
+ data->acls_a_ptr = xmemdup (st->acls_a_ptr, st->acls_a_len + 1);
+ data->acls_a_len = st->acls_a_len;
+ }
+ else
+ {
+ data->acls_a_ptr = NULL;
+ data->acls_a_len = 0;
+ }
+ if (st && st->acls_d_ptr)
+ {
+ data->acls_d_ptr = xmemdup (st->acls_d_ptr, st->acls_d_len + 1);
+ data->acls_d_len = st->acls_d_len;
+ }
+ else
+ {
+ data->acls_d_ptr = NULL;
+ data->acls_d_len = 0;
+ }
+ if (st)
+ xheader_xattr_copy (st, &data->xattr_map, &data->xattr_map_size);
+ else
+ {
+ data->xattr_map = NULL;
+ data->xattr_map_size = 0;
+ }
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;
+ if (must_be_dot_or_slash (file_name))
+ mark_after_links (data);
}
/* Update the delayed_set_stat info for an intermediate directory
- created on the path to DIR_NAME. The intermediate directory turned
+ 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;
for (data = delayed_set_stat_head; data; data = data->next)
{
struct stat st;
- if (stat (data->file_name, &st) != 0)
+ if (fstatat (chdir_fd, data->file_name, &st, data->atflag) != 0)
{
stat_error (data->file_name);
return;
if (st.st_dev == dir_stat_info->st_dev
&& st.st_ino == dir_stat_info->st_ino)
{
- data->stat_info = current_stat_info.stat;
- data->invert_permissions =
- (MODE_RWX & (current_stat_info.stat.st_mode ^ st.st_mode));
- data->permstatus = ARCHIVED_PERMSTATUS;
+ data->dev = current_stat_info.stat.st_dev;
+ data->ino = current_stat_info.stat.st_ino;
+ data->mode = current_stat_info.stat.st_mode;
+ data->uid = current_stat_info.stat.st_uid;
+ data->gid = current_stat_info.stat.st_gid;
+ data->atime = current_stat_info.atime;
+ data->mtime = current_stat_info.mtime;
+ data->current_mode = st.st_mode;
+ data->current_mode_mask = ALL_MODE_BITS;
+ data->interdir = false;
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
+/* 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. */
+ create all required directories. Return zero if all the required
+ directories were created, nonzero (issuing a diagnostic) otherwise.
+ Set *INTERDIR_MADE if at least one directory was created. */
static int
-make_directories (char *file_name)
+make_directories (char *file_name, bool *interdir_made)
{
- char *cursor0 = file_name + FILESYSTEM_PREFIX_LEN (file_name);
- char *cursor; /* points into path */
- int did_something = 0; /* did we do anything yet? */
- int mode;
- int invert_permissions;
- int status;
+ char *cursor0 = file_name + FILE_SYSTEM_PREFIX_LEN (file_name);
+ char *cursor; /* points into the file name */
-
for (cursor = cursor0; *cursor; cursor++)
{
+ mode_t mode;
+ mode_t desired_mode;
+ int status;
+
if (! ISSLASH (*cursor))
continue;
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 == cursor0 + 1 || ISSLASH (cursor[-2])
&& (cursor == cursor0 + 2 || ISSLASH (cursor[-3])))))
continue;
- *cursor = '\0'; /* truncate the path there */
- mode = MODE_RWX & ~ newdir_umask;
- invert_permissions = we_are_root ? 0 : MODE_WXUSR & ~ mode;
- status = mkdir (file_name, mode ^ invert_permissions);
+ *cursor = '\0'; /* truncate the name there */
+ desired_mode = MODE_RWX & ~ newdir_umask;
+ mode = desired_mode | (we_are_root ? 0 : MODE_WXUSR);
+ status = mkdirat (chdir_fd, file_name, mode);
if (status == 0)
{
/* Create a struct delayed_set_stat even if
- invert_permissions is zero, because
+ mode == desired_mode, because
repair_delayed_set_stat may need to update the struct. */
delay_set_stat (file_name,
- ¤t_stat_info.stat /* ignored */,
- invert_permissions, INTERDIR_PERMSTATUS);
+ 0, mode & ~ current_umask, MODE_RWX,
+ desired_mode, AT_SYMLINK_NOFOLLOW);
- print_for_mkdir (file_name, cursor - file_name, mode);
- did_something = 1;
-
- *cursor = '/';
- continue;
+ print_for_mkdir (file_name, cursor - file_name, desired_mode);
+ *interdir_made = true;
+ }
+ else if (errno == EEXIST)
+ status = 0;
+ else
+ {
+ /* Check whether the desired file exists. Even when the
+ file exists, mkdir can fail with some errno value E other
+ than EEXIST, so long as E describes an error condition
+ that also applies. */
+ int e = errno;
+ struct stat st;
+ status = fstatat (chdir_fd, file_name, &st, 0);
+ if (status)
+ {
+ errno = e;
+ mkdir_error (file_name);
+ }
}
*cursor = '/';
-
- if (errno == EEXIST)
- continue; /* Directory already exists. */
- else if ((errno == ENOSYS /* Automounted dirs on Solaris return
- this. Reported by Warren Hyde
- <Warren.Hyde@motorola.com> */
- || ERRNO_IS_EACCES) /* Turbo C mkdir gives a funny errno. */
- && access (file_name, W_OK) == 0)
- continue;
-
- /* Some other error in the mkdir. We return to the caller. */
- break;
+ if (status)
+ return status;
}
- return did_something; /* tell them to retry if we made one */
+ return 0;
}
-/* Prepare to extract a file.
- Return zero if extraction should not proceed. */
-
-static int
-prepare_to_extract (char const *file_name, bool directory)
+/* Return true if FILE_NAME (with status *STP, if STP) is not a
+ directory, and has a time stamp newer than (or equal to) that of
+ TAR_STAT. */
+static bool
+file_newer_p (const char *file_name, struct stat const *stp,
+ 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 (!stp)
{
- unlink_error (file_name);
- return 0;
+ if (deref_stat (file_name, &st) != 0)
+ {
+ if (errno != ENOENT)
+ {
+ stat_warn (file_name);
+ /* Be safer: if the file exists, assume it is newer. */
+ return true;
+ }
+ return false;
+ }
+ stp = &st;
}
- return 1;
+ return (! S_ISDIR (stp->st_mode)
+ && tar_timespec_cmp (tar_stat->mtime, get_stat_mtime (stp)) <= 0);
}
+#define RECOVER_NO 0
+#define RECOVER_OK 1
+#define RECOVER_SKIP 2
+
/* Attempt repairing what went wrong with the extraction. Delete an
already existing file or create missing intermediate directories.
- Return nonzero if we somewhat increased our chances at a successful
- extraction. errno is properly restored on zero return. */
+ Return RECOVER_OK if we somewhat increased our chances at a successful
+ extraction, RECOVER_NO if there are no chances, and RECOVER_SKIP if the
+ caller should skip extraction of that member. The value of errno is
+ properly restored on returning RECOVER_NO.
+
+ If REGULAR, the caller was trying to extract onto a regular file.
+
+ Set *INTERDIR_MADE if an intermediate directory is made as part of
+ the recovery process. */
+
static int
-maybe_recoverable (char *file_name, int *interdir_made)
+maybe_recoverable (char *file_name, bool regular, bool *interdir_made)
{
+ int e = errno;
+ struct stat st;
+ struct stat const *stp = 0;
+
if (*interdir_made)
- return 0;
+ return RECOVER_NO;
- switch (errno)
+ switch (e)
{
+ case ELOOP:
+
+ /* With open ("symlink", O_NOFOLLOW|...), POSIX says errno == ELOOP,
+ but some operating systems do not conform to the standard. */
+#ifdef EFTYPE
+ /* NetBSD uses errno == EFTYPE; see <http://gnats.netbsd.org/43154>. */
+ case EFTYPE:
+#endif
+ /* FreeBSD 8.1 uses errno == EMLINK. */
+ case EMLINK:
+ /* Tru64 5.1B uses errno == ENOTSUP. */
+ case ENOTSUP:
+
+ if (! regular
+ || old_files_option != OVERWRITE_OLD_FILES || dereference_option)
+ break;
+ if (strchr (file_name, '/'))
+ {
+ if (deref_stat (file_name, &st) != 0)
+ break;
+ stp = &st;
+ }
+
+ /* The caller tried to open a symbolic link with O_NOFOLLOW.
+ Fall through, treating it as an already-existing file. */
+
case EEXIST:
/* Remove an old file, if the options allow this. */
switch (old_files_option)
{
- default:
- return 0;
+ case SKIP_OLD_FILES:
+ WARNOPT (WARN_EXISTING_FILE,
+ (0, 0, _("%s: skipping existing file"), file_name));
+ return RECOVER_SKIP;
+
+ case KEEP_OLD_FILES:
+ return RECOVER_NO;
+
+ case KEEP_NEWER_FILES:
+ if (file_newer_p (file_name, stp, ¤t_stat_info))
+ break;
+ /* FALL THROUGH */
case DEFAULT_OLD_FILES:
case NO_OVERWRITE_DIR_OLD_FILES:
case OVERWRITE_OLD_FILES:
- {
- int r = remove_any_file (file_name, 0);
- errno = EEXIST;
- return r;
- }
+ if (0 < remove_any_file (file_name, ORDINARY_REMOVE_OPTION))
+ return RECOVER_OK;
+ break;
+
+ case UNLINK_FIRST_OLD_FILES:
+ break;
}
case ENOENT:
/* Attempt creating missing intermediate directories. */
- if (! make_directories (file_name))
- {
- errno = ENOENT;
- return 0;
- }
- *interdir_made = 1;
- return 1;
+ if (make_directories (file_name, interdir_made) == 0 && *interdir_made)
+ return RECOVER_OK;
+ break;
default:
/* Just say we can't do anything about it... */
+ break;
+ }
- return 0;
+ errno = e;
+ return RECOVER_NO;
+}
+
+/* Restore stat extended attributes (xattr) for FILE_NAME, using information
+ given in *ST. Restore before extraction because they may affect file layout
+ (e.g. on Lustre distributed parallel filesystem - setting info about how many
+ servers is this file striped over, stripe size, mirror copies, etc.
+ in advance dramatically improves the following performance of reading and
+ writing a file). If not restoring permissions, invert the INVERT_PERMISSIONS
+ bits from the file's current permissions. TYPEFLAG specifies the type of the
+ file. FILE_CREATED indicates set_xattr has created the file */
+static int
+set_xattr (char const *file_name, struct tar_stat_info const *st,
+ mode_t invert_permissions, char typeflag, int *file_created)
+{
+ int status = 0;
+
+#ifdef HAVE_XATTRS
+ bool interdir_made = false;
+
+ if ((xattrs_option > 0) && st->xattr_map_size)
+ {
+ mode_t mode = current_stat_info.stat.st_mode & MODE_RWX & ~ current_umask;
+
+ do
+ status = mknodat (chdir_fd, file_name, mode ^ invert_permissions, 0);
+ while (status && maybe_recoverable ((char *)file_name, false,
+ &interdir_made));
+
+ xattrs_xattrs_set (st, file_name, typeflag, 0);
+ *file_created = 1;
}
+#endif
+
+ return(status);
}
/* 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 delayed_set_stat *data = delayed_set_stat_head;
bool skip_this_one = 0;
struct stat st;
- struct stat const *cur_info = 0;
+ mode_t current_mode = data->current_mode;
+ mode_t current_mode_mask = data->current_mode_mask;
- 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])
&& memcmp (file_name, data->file_name, data->file_name_len) == 0))
break;
+ chdir_do (data->change_dir);
+
if (check_for_renamed_directories)
{
- cur_info = &st;
- if (stat (data->file_name, &st) != 0)
+ if (fstatat (chdir_fd, data->file_name, &st, data->atflag) != 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)))
+ else
{
- ERROR ((0, 0,
- _("%s: Directory renamed before its status could be extracted"),
- quotearg_colon (data->file_name)));
- skip_this_one = 1;
+ current_mode = st.st_mode;
+ current_mode_mask = ALL_MODE_BITS;
+ if (! (st.st_dev == data->dev && st.st_ino == data->ino))
+ {
+ ERROR ((0, 0,
+ _("%s: Directory renamed before its status could be extracted"),
+ quotearg_colon (data->file_name)));
+ skip_this_one = 1;
+ }
}
}
if (! skip_this_one)
- set_stat (data->file_name, &data->stat_info, cur_info,
- data->invert_permissions, data->permstatus, DIRTYPE);
+ {
+ struct tar_stat_info sb;
+ sb.stat.st_mode = data->mode;
+ sb.stat.st_uid = data->uid;
+ sb.stat.st_gid = data->gid;
+ sb.atime = data->atime;
+ sb.mtime = data->mtime;
+ sb.cntx_name = data->cntx_name;
+ sb.acls_a_ptr = data->acls_a_ptr;
+ sb.acls_a_len = data->acls_a_len;
+ sb.acls_d_ptr = data->acls_d_ptr;
+ sb.acls_d_len = data->acls_d_len;
+ sb.xattr_map = data->xattr_map;
+ sb.xattr_map_size = data->xattr_map_size;
+ set_stat (data->file_name, &sb,
+ -1, current_mode, current_mode_mask,
+ DIRTYPE, data->interdir, data->atflag);
+ }
delayed_set_stat_head = data->next;
+ xheader_xattr_free (data->xattr_map, data->xattr_map_size);
+ free (data->cntx_name);
+ free (data->acls_a_ptr);
+ free (data->acls_d_ptr);
free (data);
}
}
-/* Extract a file from the archive. */
-void
-extract_archive (void)
+\f
+static bool
+is_directory_link (const char *file_name)
+{
+ struct stat st;
+ int e = errno;
+ int res;
+
+ res = (fstatat (chdir_fd, file_name, &st, AT_SYMLINK_NOFOLLOW) == 0 &&
+ S_ISLNK (st.st_mode) &&
+ fstatat (chdir_fd, file_name, &st, 0) == 0 &&
+ S_ISDIR (st.st_mode));
+ errno = e;
+ return res;
+}
+\f
+/* Extractor functions for various member types */
+
+static int
+extract_dir (char *file_name, int typeflag)
{
- union block *data_block;
- int fd;
int status;
- size_t count;
- size_t written;
- int openflag;
mode_t mode;
- off_t size;
- off_t file_size;
- int interdir_made = 0;
- char typeflag;
- char *file_name;
-
- set_next_block_after (current_header);
- decode_header (current_header, ¤t_stat_info, ¤t_format, 1);
+ mode_t current_mode = 0;
+ mode_t current_mode_mask = 0;
+ int atflag = 0;
+ bool interdir_made = false;
- if (interactive_option && !confirm ("extract", current_stat_info.file_name))
+ /* Save 'root device' to avoid purging mount points. */
+ if (one_file_system_option && root_device == 0)
{
- skip_member ();
- return;
- }
-
- /* Print the block from current_header and current_stat. */
-
- if (verbose_option)
- print_header (¤t_stat_info, -1);
+ struct stat st;
- file_name = safer_name_suffix (current_stat_info.file_name, false);
- if (strip_path_elements)
- {
- size_t prefix_len = stripped_prefix_len (file_name, strip_path_elements);
- if (prefix_len == (size_t) -1)
- {
- skip_member ();
- return;
- }
- file_name += prefix_len;
+ if (fstatat (chdir_fd, ".", &st, 0) != 0)
+ stat_diag (".");
+ else
+ root_device = st.st_dev;
}
-
- apply_nonancestor_delayed_set_stat (file_name, 0);
-
- /* Take a safety backup of a previously existing file. */
-
- if (backup_option && !to_stdout_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. */
- typeflag = current_header->header.typeflag;
- /*KLUDGE */
- if (current_format == POSIX_FORMAT
- && current_stat_info.archive_file_size != current_stat_info.stat.st_size)
- typeflag = GNUTYPE_SPARSE;
-
- switch (typeflag)
+ 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 ();
+
+ /* If ownership or permissions will be restored later, create the
+ directory with restrictive permissions at first, so that in the
+ meantime processes owned by other users do not inadvertently
+ create files under this directory that inherit the wrong owner,
+ group, or permissions from the directory. If not root, though,
+ make the directory writeable and searchable at first, so that
+ files can be created under it. */
+ mode = ((current_stat_info.stat.st_mode
+ & (0 < same_owner_option || 0 < same_permissions_option
+ ? S_IRWXU
+ : MODE_RWX))
+ | (we_are_root ? 0 : MODE_WXUSR));
+
+ for (;;)
{
- case GNUTYPE_SPARSE:
- /* Fall through. */
-
- 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)
- goto really_dir;
-
- /* FIXME: deal with protection issues. */
-
- again_file:
- openflag = (O_WRONLY | O_BINARY | O_CREAT
- | (old_files_option == OVERWRITE_OLD_FILES
- ? O_TRUNC
- : O_EXCL));
- mode = current_stat_info.stat.st_mode & MODE_RWX & ~ current_umask;
-
- if (to_stdout_option)
- {
- fd = STDOUT_FILENO;
- goto extract_file;
- }
-
- if (! prepare_to_extract (file_name, 0))
+ status = mkdirat (chdir_fd, file_name, mode);
+ if (status == 0)
{
- skip_member ();
- if (backup_option)
- undo_last_backup ();
+ current_mode = mode & ~ current_umask;
+ current_mode_mask = MODE_RWX;
+ atflag = AT_SYMLINK_NOFOLLOW;
break;
}
-#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)
+ if (errno == EEXIST
+ && (interdir_made
+ || keep_directory_symlink_option
+ || old_files_option == DEFAULT_OLD_FILES
+ || old_files_option == OVERWRITE_OLD_FILES))
{
- static int conttype_diagnosed;
+ struct stat st;
- if (!conttype_diagnosed)
+ if (keep_directory_symlink_option && is_directory_link (file_name))
+ return 0;
+
+ if (deref_stat (file_name, &st) == 0)
{
- conttype_diagnosed = 1;
- WARN ((0, 0, _("Extracting contiguous files as regular files")));
+ current_mode = st.st_mode;
+ current_mode_mask = ALL_MODE_BITS;
+
+ if (S_ISDIR (current_mode))
+ {
+ if (interdir_made)
+ {
+ repair_delayed_set_stat (file_name, &st);
+ return 0;
+ }
+ break;
+ }
}
+ errno = EEXIST;
}
- fd = open (file_name, openflag, mode);
-
-#endif /* not O_CTG */
- if (fd < 0)
+ switch (maybe_recoverable (file_name, false, &interdir_made))
{
- if (maybe_recoverable (file_name, &interdir_made))
- goto again_file;
+ case RECOVER_OK:
+ continue;
- open_error (file_name);
- skip_member ();
- if (backup_option)
- undo_last_backup ();
+ case RECOVER_SKIP:
break;
- }
- extract_file:
- if (typeflag == GNUTYPE_SPARSE)
- {
- sparse_extract_file (fd, ¤t_stat_info, &size);
+ case RECOVER_NO:
+ if (errno != EEXIST)
+ {
+ mkdir_error (file_name);
+ return 1;
+ }
+ break;
}
- else
- for (size = current_stat_info.stat.st_size; size > 0; )
- {
- if (multi_volume_option)
- {
- assign_string (&save_name, current_stat_info.file_name);
- save_totsize = current_stat_info.stat.st_size;
- save_sizeleft = size;
- }
-
- /* Locate data, determine max length writeable, write it,
- block that we have used the data, then check if the write
- worked. */
-
- 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;
- count = full_write (fd, data_block->buffer, written);
- size -= count;
-
- set_next_block_after ((union block *)
- (data_block->buffer + written - 1));
- if (count != written)
- {
- write_error_details (file_name, count, written);
- break;
- }
- }
-
- skip_file (size);
+ break;
+ }
- if (multi_volume_option)
- assign_string (&save_name, 0);
+ if (status == 0
+ || old_files_option == DEFAULT_OLD_FILES
+ || old_files_option == OVERWRITE_OLD_FILES)
+ delay_set_stat (file_name, ¤t_stat_info,
+ current_mode, current_mode_mask,
+ current_stat_info.stat.st_mode, atflag);
+ return status;
+}
- /* 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;
- status = close (fd);
- if (status < 0)
- {
- close_error (file_name);
- if (backup_option)
- undo_last_backup ();
- }
+static int
+open_output_file (char const *file_name, int typeflag, mode_t mode,
+ int file_created, mode_t *current_mode,
+ mode_t *current_mode_mask)
+{
+ int fd;
+ bool overwriting_old_files = old_files_option == OVERWRITE_OLD_FILES;
+ int openflag = (O_WRONLY | O_BINARY | O_CLOEXEC | O_NOCTTY | O_NONBLOCK
+ | O_CREAT
+ | (overwriting_old_files
+ ? O_TRUNC | (dereference_option ? 0 : O_NOFOLLOW)
+ : O_EXCL));
- set_stat (file_name, ¤t_stat_info.stat, 0, 0,
- (old_files_option == OVERWRITE_OLD_FILES
- ? UNKNOWN_PERMSTATUS
- : ARCHIVED_PERMSTATUS),
- typeflag);
- break;
+ /* File might be created in set_xattr. So clear O_EXCL to avoid open() fail */
+ if (file_created)
+ openflag = openflag & ~O_EXCL;
- case SYMTYPE:
-#ifdef HAVE_SYMLINK
- if (! prepare_to_extract (file_name, 0))
- break;
+ if (typeflag == CONTTYPE)
+ {
+ static int conttype_diagnosed;
- if (absolute_names_option
- || ! (ISSLASH (current_stat_info.link_name
- [FILESYSTEM_PREFIX_LEN (current_stat_info.link_name)])
- || contains_dot_dot (current_stat_info.link_name)))
+ if (!conttype_diagnosed)
{
- while (status = symlink (current_stat_info.link_name, file_name),
- status != 0)
- if (!maybe_recoverable (file_name, &interdir_made))
- break;
+ conttype_diagnosed = 1;
+ WARNOPT (WARN_CONTIGUOUS_CAST,
+ (0, 0, _("Extracting contiguous files as regular files")));
+ }
+ }
- 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);
+ /* If O_NOFOLLOW is needed but does not work, check for a symlink
+ separately. There's a race condition, but that cannot be avoided
+ on hosts lacking O_NOFOLLOW. */
+ if (! HAVE_WORKING_O_NOFOLLOW
+ && overwriting_old_files && ! dereference_option)
+ {
+ struct stat st;
+ if (fstatat (chdir_fd, file_name, &st, AT_SYMLINK_NOFOLLOW) == 0
+ && S_ISLNK (st.st_mode))
+ {
+ errno = ELOOP;
+ return -1;
}
- else
+ }
+
+ fd = openat (chdir_fd, file_name, openflag, mode);
+ if (0 <= fd)
+ {
+ if (overwriting_old_files)
{
- /* 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 (file_name, O_WRONLY | O_CREAT | O_EXCL, 0),
- fd < 0)
- if (! maybe_recoverable (file_name, &interdir_made))
- break;
-
- status = -1;
- if (fd < 0)
- open_error (file_name);
- else if (fstat (fd, &st) != 0)
+ if (fstat (fd, &st) != 0)
{
- stat_error (file_name);
+ int e = errno;
close (fd);
+ errno = e;
+ return -1;
}
- else if (close (fd) != 0)
- close_error (file_name);
- else
+ if (! S_ISREG (st.st_mode))
{
- 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);
- }
+ close (fd);
+ errno = EEXIST;
+ return -1;
+ }
+ *current_mode = st.st_mode;
+ *current_mode_mask = ALL_MODE_BITS;
+ }
+ else
+ {
+ *current_mode = mode & ~ current_umask;
+ *current_mode_mask = MODE_RWX;
+ }
+ }
+
+ return fd;
+}
+
+static int
+extract_file (char *file_name, int typeflag)
+{
+ int fd;
+ off_t size;
+ union block *data_block;
+ int status;
+ size_t count;
+ size_t written;
+ bool interdir_made = false;
+ mode_t mode = (current_stat_info.stat.st_mode & MODE_RWX
+ & ~ (0 < same_owner_option ? S_IRWXG | S_IRWXO : 0));
+ mode_t invert_permissions = 0 < same_owner_option ? mode & (S_IRWXG | S_IRWXO)
+ : 0;
+ mode_t current_mode = 0;
+ mode_t current_mode_mask = 0;
- status = 0;
+ if (to_stdout_option)
+ fd = STDOUT_FILENO;
+ else if (to_command_option)
+ {
+ fd = sys_exec_command (file_name, 'f', ¤t_stat_info);
+ if (fd < 0)
+ {
+ skip_member ();
+ return 0;
+ }
+ }
+ else
+ {
+ int file_created = 0;
+ if (set_xattr (file_name, ¤t_stat_info, invert_permissions,
+ typeflag, &file_created))
+ {
+ skip_member ();
+ open_error (file_name);
+ return 1;
+ }
+
+ while ((fd = open_output_file (file_name, typeflag, mode,
+ file_created, ¤t_mode,
+ ¤t_mode_mask))
+ < 0)
+ {
+ int recover = maybe_recoverable (file_name, true, &interdir_made);
+ if (recover != RECOVER_OK)
+ {
+ skip_member ();
+ if (recover == RECOVER_SKIP)
+ return 0;
+ open_error (file_name);
+ return 1;
}
}
-
- if (status != 0 && backup_option)
- undo_last_backup ();
- break;
+ }
-#else
+ mv_begin_read (¤t_stat_info);
+ 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; )
{
- static int warned_once;
+ mv_size_left (size);
- if (!warned_once)
+ /* 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)
{
- warned_once = 1;
- WARN ((0, 0,
- _("Attempting extraction of symbolic links as hard links")));
+ ERROR ((0, 0, _("Unexpected EOF in archive")));
+ break; /* FIXME: What happens, then? */
}
- }
- typeflag = LNKTYPE;
- /* Fall through. */
-#endif
-
- case LNKTYPE:
- if (! prepare_to_extract (file_name, 0))
- break;
- again_link:
- {
- char const *link_name = safer_name_suffix (current_stat_info.link_name,
- true);
- struct stat st1, st2;
- int e;
+ written = available_space_after (data_block);
- /* MSDOS does not implement links. However, djgpp's link() actually
- copies the file. */
- status = link (link_name, file_name);
+ if (written > size)
+ written = size;
+ errno = 0;
+ count = blocking_write (fd, data_block->buffer, written);
+ size -= written;
- if (status == 0)
+ set_next_block_after ((union block *)
+ (data_block->buffer + written - 1));
+ if (count != written)
{
- struct delayed_symlink *ds = delayed_symlink_head;
- if (ds && stat (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;
- }
+ if (!to_command_option)
+ write_error_details (file_name, count, written);
+ /* FIXME: shouldn't we restore from backup? */
break;
}
- if (maybe_recoverable (file_name, &interdir_made))
- goto again_link;
+ }
- if (incremental_option && errno == EEXIST)
- break;
- e = errno;
- if (stat (link_name, &st1) == 0
- && stat (file_name, &st2) == 0
- && st1.st_dev == st2.st_dev
- && st1.st_ino == st2.st_ino)
- break;
+ skip_file (size);
- link_error (link_name, file_name);
- if (backup_option)
- undo_last_backup ();
- }
- break;
+ mv_end ();
-#if S_IFCHR
- case CHRTYPE:
- current_stat_info.stat.st_mode |= S_IFCHR;
- goto make_node;
-#endif
+ /* 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 S_IFBLK
- case BLKTYPE:
- current_stat_info.stat.st_mode |= S_IFBLK;
-#endif
+ if (to_stdout_option)
+ return 0;
-#if S_IFCHR || S_IFBLK
- make_node:
- if (! prepare_to_extract (file_name, 0))
- break;
+ if (! to_command_option)
+ set_stat (file_name, ¤t_stat_info, fd,
+ current_mode, current_mode_mask, typeflag, false,
+ (old_files_option == OVERWRITE_OLD_FILES
+ ? 0 : AT_SYMLINK_NOFOLLOW));
- status = mknod (file_name, current_stat_info.stat.st_mode,
- current_stat_info.stat.st_rdev);
- if (status != 0)
- {
- if (maybe_recoverable (file_name, &interdir_made))
- goto make_node;
- mknod_error (file_name);
- if (backup_option)
- undo_last_backup ();
- break;
- };
- set_stat (file_name, ¤t_stat_info.stat, 0, 0,
- ARCHIVED_PERMSTATUS, typeflag);
- break;
-#endif
+ status = close (fd);
+ if (status < 0)
+ close_error (file_name);
-#if HAVE_MKFIFO || defined mkfifo
- case FIFOTYPE:
- if (! prepare_to_extract (file_name, 0))
- break;
+ if (to_command_option)
+ sys_wait_command ();
- while (status = mkfifo (file_name, current_stat_info.stat.st_mode),
- status != 0)
- if (!maybe_recoverable (file_name, &interdir_made))
- break;
+ return status;
+}
- if (status == 0)
- set_stat (file_name, ¤t_stat_info.stat, NULL, 0,
- ARCHIVED_PERMSTATUS, typeflag);
- else
+/* 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, bool *interdir_made)
+{
+ int fd;
+ struct stat st;
+
+ while ((fd = openat (chdir_fd, file_name, O_WRONLY | O_CREAT | O_EXCL, 0)) < 0)
+ {
+ switch (maybe_recoverable (file_name, false, interdir_made))
{
- mkfifo_error (file_name);
- if (backup_option)
- undo_last_backup ();
+ case RECOVER_OK:
+ continue;
+
+ case RECOVER_SKIP:
+ return 0;
+
+ case RECOVER_NO:
+ open_error (file_name);
+ return -1;
}
- break;
-#endif
+ }
- case DIRTYPE:
- case GNUTYPE_DUMPDIR:
- really_dir:
- if (incremental_option)
+ 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->birthtime = get_stat_birthtime (&st);
+ p->is_symlink = is_symlink;
+ if (is_symlink)
{
- /* Read the entry and delete files that aren't listed in the
- archive. */
-
- gnu_restore (file_name);
+ p->mode = current_stat_info.stat.st_mode;
+ p->uid = current_stat_info.stat.st_uid;
+ p->gid = current_stat_info.stat.st_gid;
+ p->atime = current_stat_info.atime;
+ p->mtime = current_stat_info.mtime;
}
- else if (typeflag == GNUTYPE_DUMPDIR)
- skip_member ();
+ p->change_dir = chdir_current;
+ p->sources = xmalloc (offsetof (struct string_list, string)
+ + strlen (file_name) + 1);
+ p->sources->next = 0;
+ strcpy (p->sources->string, file_name);
+ p->cntx_name = NULL;
+ assign_string (&p->cntx_name, current_stat_info.cntx_name);
+ p->acls_a_ptr = NULL;
+ p->acls_a_len = 0;
+ p->acls_d_ptr = NULL;
+ p->acls_d_len = 0;
+ xheader_xattr_copy (¤t_stat_info, &p->xattr_map, &p->xattr_map_size);
+ 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])
+ && (last_component (file_name) == file_name + h->file_name_len + 1))
+ mark_after_links (h);
- mode = ((current_stat_info.stat.st_mode
- | (we_are_root ? 0 : MODE_WXUSR))
- & MODE_RWX);
+ return 0;
+ }
- status = prepare_to_extract (file_name, 1);
- if (status == 0)
- break;
- if (status < 0)
- goto directory_exists;
+ return -1;
+}
- again_dir:
- status = mkdir (file_name, mode);
+static int
+extract_link (char *file_name, int typeflag)
+{
+ bool interdir_made = false;
+ char const *link_name;
+ int rc;
+
+ link_name = current_stat_info.link_name;
+
+ if (! absolute_names_option && contains_dot_dot (link_name))
+ return create_placeholder_file (file_name, false, &interdir_made);
+
+ do
+ {
+ struct stat st1, st2;
+ int e;
+ int status = linkat (chdir_fd, link_name, chdir_fd, file_name, 0);
+ e = errno;
- if (status != 0)
+ if (status == 0)
{
- if (errno == EEXIST
- && (interdir_made
- || old_files_option == DEFAULT_OLD_FILES
- || old_files_option == OVERWRITE_OLD_FILES))
- {
- struct stat st;
- if (stat (file_name, &st) == 0)
+ struct delayed_link *ds = delayed_link_head;
+ if (ds
+ && fstatat (chdir_fd, link_name, &st1, AT_SYMLINK_NOFOLLOW) == 0)
+ for (; ds; ds = ds->next)
+ if (ds->change_dir == chdir_current
+ && ds->dev == st1.st_dev
+ && ds->ino == st1.st_ino
+ && (timespec_cmp (ds->birthtime, get_stat_birthtime (&st1))
+ == 0))
{
- if (interdir_made)
- {
- repair_delayed_set_stat (file_name, &st);
- break;
- }
- if (S_ISDIR (st.st_mode))
- {
- mode = st.st_mode & ~ current_umask;
- goto directory_exists;
- }
+ 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;
}
- errno = EEXIST;
- }
-
- if (maybe_recoverable (file_name, &interdir_made))
- goto again_dir;
+ return 0;
+ }
+ else if ((e == EEXIST && strcmp (link_name, file_name) == 0)
+ || ((fstatat (chdir_fd, link_name, &st1, AT_SYMLINK_NOFOLLOW)
+ == 0)
+ && (fstatat (chdir_fd, file_name, &st2, AT_SYMLINK_NOFOLLOW)
+ == 0)
+ && st1.st_dev == st2.st_dev
+ && st1.st_ino == st2.st_ino))
+ return 0;
+
+ errno = e;
+ }
+ while ((rc = maybe_recoverable (file_name, false, &interdir_made))
+ == RECOVER_OK);
- if (errno != EEXIST)
- {
- mkdir_error (file_name);
- if (backup_option)
- undo_last_backup ();
- break;
- }
+ if (rc == RECOVER_SKIP)
+ return 0;
+ if (!(incremental_option && errno == EEXIST))
+ {
+ link_error (link_name, file_name);
+ return 1;
+ }
+ return 0;
+}
+
+static int
+extract_symlink (char *file_name, int typeflag)
+{
+#ifdef HAVE_SYMLINK
+ bool interdir_made = false;
+
+ 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 (symlinkat (current_stat_info.link_name, chdir_fd, file_name) != 0)
+ switch (maybe_recoverable (file_name, false, &interdir_made))
+ {
+ case RECOVER_OK:
+ continue;
+
+ case RECOVER_SKIP:
+ return 0;
+
+ case RECOVER_NO:
+ symlink_error (current_stat_info.link_name, file_name);
+ return -1;
+ }
+
+ set_stat (file_name, ¤t_stat_info, -1, 0, 0,
+ SYMTYPE, false, AT_SYMLINK_NOFOLLOW);
+ return 0;
+
+#else
+ static int warned_once;
+
+ if (!warned_once)
+ {
+ warned_once = 1;
+ WARNOPT (WARN_SYMLINK_CAST,
+ (0, 0,
+ _("Attempting extraction of symbolic links as hard links")));
+ }
+ return extract_link (file_name, typeflag);
+#endif
+}
+
+#if S_IFCHR || S_IFBLK
+static int
+extract_node (char *file_name, int typeflag)
+{
+ bool interdir_made = false;
+ mode_t mode = (current_stat_info.stat.st_mode & (MODE_RWX | S_IFBLK | S_IFCHR)
+ & ~ (0 < same_owner_option ? S_IRWXG | S_IRWXO : 0));
+
+ while (mknodat (chdir_fd, file_name, mode, current_stat_info.stat.st_rdev)
+ != 0)
+ switch (maybe_recoverable (file_name, false, &interdir_made))
+ {
+ case RECOVER_OK:
+ continue;
+
+ case RECOVER_SKIP:
+ return 0;
+
+ case RECOVER_NO:
+ mknod_error (file_name);
+ return -1;
+ }
+
+ set_stat (file_name, ¤t_stat_info, -1,
+ mode & ~ current_umask, MODE_RWX,
+ typeflag, false, AT_SYMLINK_NOFOLLOW);
+ return 0;
+}
+#endif
+
+#if HAVE_MKFIFO || defined mkfifo
+static int
+extract_fifo (char *file_name, int typeflag)
+{
+ bool interdir_made = false;
+ mode_t mode = (current_stat_info.stat.st_mode & MODE_RWX
+ & ~ (0 < same_owner_option ? S_IRWXG | S_IRWXO : 0));
+
+ while (mkfifoat (chdir_fd, file_name, mode) != 0)
+ switch (maybe_recoverable (file_name, false, &interdir_made))
+ {
+ case RECOVER_OK:
+ continue;
+
+ case RECOVER_SKIP:
+ return 0;
+
+ case RECOVER_NO:
+ mkfifo_error (file_name);
+ return -1;
+ }
+
+ set_stat (file_name, ¤t_stat_info, -1,
+ mode & ~ current_umask, MODE_RWX,
+ typeflag, false, AT_SYMLINK_NOFOLLOW);
+ return 0;
+}
+#endif
+
+static int
+extract_volhdr (char *file_name, int typeflag)
+{
+ skip_member ();
+ return 0;
+}
+
+static int
+extract_failure (char *file_name, int typeflag)
+{
+ return 1;
+}
+
+static int
+extract_skip (char *file_name, int typeflag)
+{
+ skip_member ();
+ return 0;
+}
+
+typedef int (*tar_extractor_t) (char *file_name, int typeflag);
+
+\f
+
+/* Prepare to extract a file. Find extractor function.
+ Return zero if extraction should not proceed. */
+
+static int
+prepare_to_extract (char const *file_name, int typeflag, tar_extractor_t *fun)
+{
+ int rc = 1;
+
+ if (EXTRACT_OVER_PIPE)
+ rc = 0;
+
+ /* Select the extractor */
+ switch (typeflag)
+ {
+ case GNUTYPE_SPARSE:
+ *fun = extract_file;
+ rc = 1;
+ break;
+
+ case AREGTYPE:
+ case REGTYPE:
+ case CONTTYPE:
+ /* Appears to be a file. But BSD tar uses the convention that a slash
+ suffix means a directory. */
+ if (current_stat_info.had_trailing_slash)
+ *fun = extract_dir;
+ else
+ {
+ *fun = extract_file;
+ rc = 1;
}
+ break;
- directory_exists:
- 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));
+ case SYMTYPE:
+ *fun = extract_symlink;
break;
- case GNUTYPE_VOLHDR:
- if (verbose_option)
- fprintf (stdlis, _("Reading %s\n"), quote (current_stat_info.file_name));
+ case LNKTYPE:
+ *fun = extract_link;
+ break;
+
+#if S_IFCHR
+ case CHRTYPE:
+ current_stat_info.stat.st_mode |= S_IFCHR;
+ *fun = extract_node;
+ break;
+#endif
+
+#if S_IFBLK
+ case BLKTYPE:
+ current_stat_info.stat.st_mode |= S_IFBLK;
+ *fun = extract_node;
+ break;
+#endif
+
+#if HAVE_MKFIFO || defined mkfifo
+ case FIFOTYPE:
+ *fun = extract_fifo;
break;
+#endif
- case GNUTYPE_NAMES:
- extract_mangle ();
+ case DIRTYPE:
+ case GNUTYPE_DUMPDIR:
+ *fun = extract_dir;
+ if (current_stat_info.is_dumpdir)
+ delay_directory_restore_option = true;
+ break;
+
+ case GNUTYPE_VOLHDR:
+ *fun = extract_volhdr;
break;
case GNUTYPE_MULTIVOL:
ERROR ((0, 0,
_("%s: Cannot extract -- file is continued from another volume"),
quotearg_colon (current_stat_info.file_name)));
- skip_member ();
- if (backup_option)
- undo_last_backup ();
+ *fun = extract_skip;
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:
+ WARNOPT (WARN_UNKNOWN_CAST,
+ (0, 0,
+ _("%s: Unknown file type '%c', extracted as normal file"),
+ quotearg_colon (file_name), typeflag));
+ *fun = extract_file;
+ }
+
+ /* Determine whether the extraction should proceed */
+ if (rc == 0)
+ return 0;
+
+ 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, 0, ¤t_stat_info))
+ {
+ WARNOPT (WARN_IGNORE_NEWER,
+ (0, 0, _("Current %s is newer or same age"),
+ quote (file_name)));
+ return 0;
+ }
break;
default:
- WARN ((0, 0,
- _("%s: Unknown file type '%c', extracted as normal file"),
- quotearg_colon (file_name), typeflag));
- goto again_file;
+ break;
+ }
+
+ return 1;
+}
+
+/* Extract a file from the archive. */
+void
+extract_archive (void)
+{
+ char typeflag;
+ tar_extractor_t fun;
+
+ fatal_exit_hook = extract_finish;
+
+ set_next_block_after (current_header);
+
+ if (!current_stat_info.file_name[0]
+ || (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, current_header, -1);
+
+ /* Restore stats for all non-ancestor directories, unless
+ it is an incremental archive.
+ (see NOTICE in the comment to delay_set_stat above) */
+ if (!delay_directory_restore_option)
+ {
+ int dir = chdir_current;
+ apply_nonancestor_delayed_set_stat (current_stat_info.file_name, 0);
+ chdir_do (dir);
+ }
+
+ /* Take a safety backup of a previously existing file. */
+
+ if (backup_option)
+ if (!maybe_backup_file (current_stat_info.file_name, 0))
+ {
+ int e = errno;
+ ERROR ((0, e, _("%s: Was unable to backup this file"),
+ quotearg_colon (current_stat_info.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 (current_stat_info.file_name, typeflag, &fun))
+ {
+ if (fun && (*fun) (current_stat_info.file_name, typeflag)
+ && backup_option)
+ undo_last_backup ();
}
+ else
+ skip_member ();
+
}
-/* Extract the symbolic links whose final extraction were delayed. */
+/* Extract the 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;
+ chdir_do (ds->change_dir);
+
for (sources = ds->sources; sources; sources = sources->next)
{
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
+ don't create a link, as the placeholder was probably
removed by a later extraction. */
- if (lstat (source, &st) == 0
+ if (fstatat (chdir_fd, source, &st, AT_SYMLINK_NOFOLLOW) == 0
&& st.st_dev == ds->dev
&& st.st_ino == ds->ino
- && st.st_mtime == ds->mtime)
+ && timespec_cmp (get_stat_birthtime (&st), ds->birthtime) == 0)
{
/* Unlink the placeholder, then create a hard link if possible,
a symbolic link otherwise. */
- if (unlink (source) != 0)
+ if (unlinkat (chdir_fd, source, 0) != 0)
unlink_error (source);
- else if (valid_source && link (valid_source, source) == 0)
+ else if (valid_source
+ && (linkat (chdir_fd, valid_source, chdir_fd, source, 0)
+ == 0))
;
- else if (symlink (ds->target, source) != 0)
+ else if (!ds->is_symlink)
+ {
+ if (linkat (chdir_fd, ds->target, chdir_fd, source, 0) != 0)
+ link_error (ds->target, source);
+ }
+ else if (symlinkat (ds->target, chdir_fd, source) != 0)
symlink_error (ds->target, source);
else
{
+ struct tar_stat_info st1;
+ st1.stat.st_mode = ds->mode;
+ st1.stat.st_uid = ds->uid;
+ st1.stat.st_gid = ds->gid;
+ st1.atime = ds->atime;
+ st1.mtime = ds->mtime;
+ st1.cntx_name = ds->cntx_name;
+ st1.acls_a_ptr = ds->acls_a_ptr;
+ st1.acls_a_len = ds->acls_a_len;
+ st1.acls_d_ptr = ds->acls_d_ptr;
+ st1.acls_d_len = ds->acls_d_len;
+ st1.xattr_map = ds->xattr_map;
+ st1.xattr_map_size = ds->xattr_map_size;
+ set_stat (source, &st1, -1, 0, 0, SYMTYPE,
+ false, AT_SYMLINK_NOFOLLOW);
valid_source = source;
- st.st_uid = ds->uid;
- st.st_gid = ds->gid;
- set_stat (source, &st, 0, 0, 0, SYMTYPE);
}
}
}
sources = next;
}
+ xheader_xattr_free (ds->xattr_map, ds->xattr_map_size);
+ free (ds->cntx_name);
+
{
- 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);
}
-void
-fatal_exit (void)
+bool
+rename_directory (char *src, char *dst)
{
- extract_finish ();
- error (TAREXIT_FAILURE, 0, _("Error is not recoverable: exiting now"));
- abort ();
+ if (renameat (chdir_fd, src, chdir_fd, dst) != 0)
+ {
+ int e = errno;
+ bool interdir_made;
+
+ switch (e)
+ {
+ case ENOENT:
+ if (make_directories (dst, &interdir_made) == 0)
+ {
+ if (renameat (chdir_fd, src, chdir_fd, dst) == 0)
+ return true;
+ e = errno;
+ }
+ break;
+
+ case EXDEV:
+ /* FIXME: Fall back to recursive copying */
+
+ default:
+ break;
+ }
+
+ ERROR ((0, e, _("Cannot rename %s to %s"),
+ quote_n (0, src),
+ quote_n (1, dst)));
+ return false;
+ }
+ return true;
}
projects / chaz / tar / blobdiff