/* Extract files from a tar archive.
- Copyright 1988, 92,93,94,96,97,98,99, 2000 Free Software Foundation, Inc.
+ Copyright 1988,92,93,94,96,97,98,99,2000,2001 Free Software Foundation, Inc.
Written by John Gilmore, on 1985-11-19.
This program is free software; you can redistribute it and/or modify it
#include "common.h"
-static int we_are_root; /* true if our effective uid == 0 */
+int we_are_root; /* true if our effective uid == 0 */
static mode_t newdir_umask; /* umask when creating new directories */
static mode_t current_umask; /* current umask (which is set to 0 if -p) */
static struct delayed_set_stat *delayed_set_stat_head;
-/*--------------------------.
-| Set up to extract files. |
-`--------------------------*/
+/* List of symbolic links whose creation we have delayed. */
+struct delayed_symlink
+ {
+ /* 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. */
+ dev_t dev;
+ ino_t ino;
+ time_t mtime;
+
+ /* The desired owner and group of the symbolic link. */
+ 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];
+ };
+
+static struct delayed_symlink *delayed_symlink_head;
+/* 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 = apply_delayed_set_stat;
+ 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
PERMSTATUS specifies the status of the file's permissions.
TYPEFLAG specifies the type of the file. */
static void
-set_mode (char *file_name, struct stat *stat_info,
+set_mode (char const *file_name, struct stat const *stat_info,
mode_t invert_permissions, enum permstatus permstatus,
char typeflag)
{
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)
+{
+ 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)));
+}
+
/* Restore stat attributes (owner, group, mode and times) for
FILE_NAME, using information given in *STAT_INFO.
If not restoring permissions, invert the
punt for the rest. Sigh! */
static void
-set_stat (char *file_name, struct stat *stat_info,
+set_stat (char const *file_name, struct stat const *stat_info,
mode_t invert_permissions, enum permstatus permstatus,
char typeflag)
{
if (utime (file_name, &utimbuf) < 0)
utime_error (file_name);
+ else
+ {
+ check_time (file_name, stat_info->st_atime);
+ check_time (file_name, stat_info->st_mtime);
+ }
}
/* Some systems allow non-root users to give files away. Once this
}
/* 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, due to ".." or
- symbolic links. *DIR_STAT_INFO is the status of the 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. */
static void
repair_delayed_set_stat (char const *dir_name,
struct stat const *dir_stat_info)
quotearg_colon (dir_name)));
}
-/*-----------------------------------------------------------------------.
-| After a file/link/symlink/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. |
-`-----------------------------------------------------------------------*/
-
+/* After a file/link/symlink/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. */
static int
make_directories (char *file_name)
{
+ char *cursor0 = file_name + FILESYSTEM_PREFIX_LEN (file_name);
char *cursor; /* points into path */
int did_something = 0; /* did we do anything yet? */
- int saved_errno = errno; /* remember caller's errno */
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 "..". */
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 */
break;
}
- errno = saved_errno;
return did_something; /* tell them to retry if we made one */
}
return 1;
}
-/*--------------------------------------------------------------------.
-| 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. |
-`--------------------------------------------------------------------*/
-
+/* 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. */
static int
maybe_recoverable (char *file_name, int *interdir_made)
{
case ENOENT:
/* Attempt creating missing intermediate directories. */
if (! make_directories (file_name))
- return 0;
+ {
+ errno = ENOENT;
+ return 0;
+ }
*interdir_made = 1;
return 1;
}
}
-/*---.
-| ? |
-`---*/
-
static void
extract_sparse_file (int fd, off_t *sizeleft, off_t totalsize, char *name)
{
int sparse_ind = 0;
- size_t written;
- ssize_t count;
/* assuming sizeleft is initially totalsize */
while (*sizeleft > 0)
{
+ size_t written;
+ size_t count;
union block *data_block = find_next_block ();
if (! data_block)
{
while (written > BLOCKSIZE)
{
count = full_write (fd, data_block->buffer, BLOCKSIZE);
- if (count < 0)
- write_error (name);
written -= count;
*sizeleft -= count;
+ if (count != BLOCKSIZE)
+ {
+ write_error_details (name, count, BLOCKSIZE);
+ return;
+ }
set_next_block_after (data_block);
data_block = find_next_block ();
if (! data_block)
}
count = full_write (fd, data_block->buffer, written);
+ *sizeleft -= count;
- if (count < 0)
- write_error (name);
- else if (count != written)
+ if (count != written)
{
write_error_details (name, count, written);
- skip_file (*sizeleft);
+ return;
}
- written -= count;
- *sizeleft -= count;
set_next_block_after (data_block);
}
-
- free (sparsearray);
}
-/*----------------------------------.
-| Extract a file from the archive. |
-`----------------------------------*/
+/* 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)
+{
+ size_t file_name_len = strlen (file_name);
+
+ while (delayed_set_stat_head)
+ {
+ struct delayed_set_stat *data = delayed_set_stat_head;
+ if (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;
+ delayed_set_stat_head = data->next;
+ set_stat (data->file_name, &data->stat_info,
+ data->invert_permissions, data->permstatus, DIRTYPE);
+ free (data);
+ }
+}
+/* Extract a file from the archive. */
void
extract_archive (void)
{
union block *data_block;
int fd;
int status;
- ssize_t sstatus;
+ size_t count;
size_t name_length;
size_t written;
int openflag;
mode_t mode;
off_t size;
- int skipcrud;
+ size_t skipcrud;
int counter;
int interdir_made = 0;
char typeflag;
-#if 0
- int sparse_ind = 0;
-#endif
union block *exhdr;
#define CURRENT_FILE_NAME (skipcrud + current_file_name)
if (interactive_option && !confirm ("extract", current_file_name))
{
- if (current_header->oldgnu_header.isextended)
- skip_extended_headers ();
- skip_file (current_stat.st_size);
+ skip_member ();
return;
}
- /* Print the block from `current_header' and `current_stat'. */
+ /* Print the block from current_header and current_stat. */
if (verbose_option)
print_header ();
skipcrud = 0;
if (! absolute_names_option)
{
- while (CURRENT_FILE_NAME[0] == '/')
+ if (contains_dot_dot (CURRENT_FILE_NAME))
+ {
+ ERROR ((0, 0, _("%s: Member name contains `..'"),
+ quotearg_colon (CURRENT_FILE_NAME)));
+ skip_member ();
+ return;
+ }
+
+ skipcrud = FILESYSTEM_PREFIX_LEN (current_file_name);
+ while (ISSLASH (CURRENT_FILE_NAME[0]))
+ skipcrud++;
+
+ if (skipcrud)
{
static int warned_once;
if (!warned_once)
{
warned_once = 1;
- WARN ((0, 0, _("Removing leading `/' from member names")));
+ WARN ((0, 0, _("Removing leading `%.*s' from member names"),
+ (int) skipcrud, current_file_name));
}
- skipcrud++; /* force relative path */
- }
-
- if (contains_dot_dot (CURRENT_FILE_NAME))
- {
- ERROR ((0, 0, _("%s: Member name contains `..'"),
- quotearg_colon (CURRENT_FILE_NAME)));
- if (current_header->oldgnu_header.isextended)
- skip_extended_headers ();
- skip_file (current_stat.st_size);
- return;
}
}
+ apply_nonancestor_delayed_set_stat (CURRENT_FILE_NAME);
+
/* Take a safety backup of a previously existing file. */
if (backup_option && !to_stdout_option)
int e = errno;
ERROR ((0, e, _("%s: Was unable to backup this file"),
quotearg_colon (CURRENT_FILE_NAME)));
- if (current_header->oldgnu_header.isextended)
- skip_extended_headers ();
- skip_file (current_stat.st_size);
+ skip_member ();
return;
}
suffix means a directory. */
name_length = strlen (CURRENT_FILE_NAME);
- if (name_length && CURRENT_FILE_NAME[name_length - 1] == '/')
+ if (FILESYSTEM_PREFIX_LEN (CURRENT_FILE_NAME) < name_length
+ && CURRENT_FILE_NAME[name_length - 1] == '/')
goto really_dir;
/* FIXME: deal with protection issues. */
if (! prepare_to_extract (CURRENT_FILE_NAME))
{
- if (current_header->oldgnu_header.isextended)
- skip_extended_headers ();
- skip_file (current_stat.st_size);
+ skip_member ();
if (backup_option)
undo_last_backup ();
break;
goto again_file;
open_error (CURRENT_FILE_NAME);
- if (current_header->oldgnu_header.isextended)
- skip_extended_headers ();
- skip_file (current_stat.st_size);
+ skip_member ();
if (backup_option)
undo_last_backup ();
break;
memcpy (name, CURRENT_FILE_NAME, name_length_bis);
size = current_stat.st_size;
extract_sparse_file (fd, &size, current_stat.st_size, name);
+ free (sparsearray);
}
else
- for (size = current_stat.st_size;
- size > 0;
- size -= written)
+ for (size = current_stat.st_size; size > 0; )
{
if (multi_volume_option)
{
if (written > size)
written = size;
errno = 0;
- sstatus = full_write (fd, data_block->buffer, written);
+ count = full_write (fd, data_block->buffer, written);
+ size -= count;
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 (count != written)
+ {
+ write_error_details (CURRENT_FILE_NAME, count, written);
+ break;
+ }
}
+ skip_file (size);
+
if (multi_volume_option)
assign_string (&save_name, 0);
if (! prepare_to_extract (CURRENT_FILE_NAME))
break;
- while (status = symlink (current_link_name, CURRENT_FILE_NAME),
- status != 0)
- if (!maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
- break;
-
- if (status == 0)
-
- /* Setting the attributes of symbolic links might, on some systems,
- change the pointed to file, instead of the symbolic link itself.
- At least some of these systems have a lchown call, and the
- set_stat routine knows about this. */
-
- set_stat (CURRENT_FILE_NAME, ¤t_stat, 0,
- ARCHIVED_PERMSTATUS, typeflag);
+ if (absolute_names_option
+ || (ISSLASH (current_link_name
+ [FILESYSTEM_PREFIX_LEN (current_link_name)])
+ && ! 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;
+ if (status == 0)
+ set_stat (CURRENT_FILE_NAME, ¤t_stat, 0, 0, SYMTYPE);
+ else
+ symlink_error (current_link_name, CURRENT_FILE_NAME);
+ }
else
{
- int e = errno;
- ERROR ((0, e, _("%s: Cannot create symlink to %s"),
- quotearg_colon (CURRENT_FILE_NAME),
- quote (current_link_name)));
- if (backup_option)
- undo_last_backup ();
+ /* 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;
+
+ 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;
#else
name_length = strlen (CURRENT_FILE_NAME);
really_dir:
- /* Remove trailing "/" and "/.", unless that would result in the
- empty string. */
- for (;;)
- {
- if (1 < name_length && CURRENT_FILE_NAME[name_length - 1] == '/')
- CURRENT_FILE_NAME[--name_length] = '\0';
- else if (2 < name_length
- && CURRENT_FILE_NAME[name_length - 1] == '.'
- && CURRENT_FILE_NAME[name_length - 2] == '/')
- CURRENT_FILE_NAME[name_length -= 2] = '\0';
- else
- break;
- }
if (incremental_option)
{
gnu_restore (skipcrud);
}
else if (typeflag == GNUTYPE_DUMPDIR)
- skip_file (current_stat.st_size);
+ skip_member ();
if (! prepare_to_extract (CURRENT_FILE_NAME))
break;
& MODE_RWX);
again_dir:
- status = mkdir (CURRENT_FILE_NAME, mode);
+ {
+ /* Do not pass redundant trailing "/" to mkdir, as POSIX does
+ not allow mkdir to ignore it. */
+ size_t len = name_length;
+ char ch = '\0';
+ while (FILESYSTEM_PREFIX_LEN (CURRENT_FILE_NAME) < len
+ && CURRENT_FILE_NAME[len - 1] == '/')
+ len--, ch = '/';
+ CURRENT_FILE_NAME[len] = '\0';
+ status = mkdir (CURRENT_FILE_NAME, mode);
+ CURRENT_FILE_NAME[len] = ch;
+ }
+
if (status != 0)
{
- if (errno == EEXIST && interdir_made
- && contains_dot_dot (CURRENT_FILE_NAME))
+ if (errno == EEXIST && interdir_made)
{
- int e = errno;
struct stat st;
if (stat (CURRENT_FILE_NAME, &st) == 0)
{
repair_delayed_set_stat (CURRENT_FILE_NAME, &st);
break;
}
- e = errno;
+ errno = EEXIST;
}
if (maybe_recoverable (CURRENT_FILE_NAME, &interdir_made))
goto again_dir;
- if (errno != EEXIST || old_files_option == KEEP_OLD_FILES)
+ if (errno != EEXIST)
{
mkdir_error (CURRENT_FILE_NAME);
if (backup_option)
ERROR ((0, 0,
_("%s: Cannot extract -- file is continued from another volume"),
quotearg_colon (current_file_name)));
- skip_file (current_stat.st_size);
+ skip_member ();
if (backup_option)
undo_last_backup ();
break;
case GNUTYPE_LONGNAME:
case GNUTYPE_LONGLINK:
ERROR ((0, 0, _("Visible long name error")));
- skip_file (current_stat.st_size);
+ skip_member ();
if (backup_option)
undo_last_backup ();
break;
#undef CURRENT_FILE_NAME
}
-/* Fix the status of all directories whose statuses need fixing. */
-void
-apply_delayed_set_stat (void)
+/* Extract the symbolic links whose final extraction were delayed. */
+static void
+apply_delayed_symlinks (void)
{
- apply_nonancestor_delayed_set_stat ("");
+ struct delayed_symlink *p;
+ struct delayed_symlink *next;
+
+ for (p = delayed_symlink_head; p; p = next)
+ {
+ char const *file = p->names;
+ struct stat st;
+
+ /* 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)
+ {
+ if (unlink (file) != 0)
+ unlink_error (file);
+ else
+ {
+ char const *contents = file + strlen (file) + 1;
+ if (symlink (contents, file) != 0)
+ symlink_error (contents, file);
+ else
+ {
+ st.st_uid = p->uid;
+ st.st_gid = p->gid;
+ set_stat (file, &st, 0, 0, SYMTYPE);
+ }
+ }
+ }
+
+ next = p->next;
+ free (p);
+ }
+
+ delayed_symlink_head = 0;
}
-/* Fix the statuses of all directories whose statuses need fixing, and
- which are not ancestors of FILE_NAME. */
+/* Finish the extraction of an archive. */
void
-apply_nonancestor_delayed_set_stat (char const *file_name)
+extract_finish (void)
{
- size_t file_name_len = strlen (file_name);
-
- while (delayed_set_stat_head)
- {
- struct delayed_set_stat *data = delayed_set_stat_head;
- if (data->file_name_len < file_name_len
- && file_name[data->file_name_len] == '/'
- && 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);
- }
+ /* Apply delayed symlinks last, so that they don't affect
+ delayed directory status-setting. */
+ apply_nonancestor_delayed_set_stat ("");
+ apply_delayed_symlinks ();
}
void
fatal_exit (void)
{
- apply_delayed_set_stat ();
+ extract_finish ();
error (TAREXIT_FAILURE, 0, _("Error is not recoverable: exiting now"));
abort ();
}
projects / chaz / tar / blobdiff