/* vi: set sw=4 ts=4: */
/*
- * Utility routines.
+ * Mini copy_file implementation for busybox
*
- * Copyright (C) tons of folks. Tracking down who wrote what
- * isn't something I'm going to worry about... If you wrote something
- * here, please feel free to acknowledge your work.
+ * Copyright (C) 2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
*
- * 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 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.
- *
- * 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
- *
- * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
- * Permission has been granted to redistribute this code under the GPL.
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
*/
-#include <stdio.h>
-#include <errno.h>
-#include <utime.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/stat.h>
#include "libbb.h"
-
-/*
- * Copy one file to another, while possibly preserving its modes, times, and
- * modes. Returns TRUE if successful, or FALSE on a failure with an error
- * message output. (Failure is not indicated if attributes cannot be set.)
- * -Erik Andersen
- */
-int
-copy_file(const char *srcName, const char *destName,
- int setModes, int followLinks, int forceFlag)
+static int retry_overwrite(const char *dest, int flags)
{
- int rfd;
- int wfd;
- int status;
- struct stat srcStatBuf;
- struct stat dstStatBuf;
- struct utimbuf times;
-
- if (followLinks == TRUE)
- status = stat(srcName, &srcStatBuf);
- else
- status = lstat(srcName, &srcStatBuf);
-
- if (status < 0) {
- perror_msg("%s", srcName);
- return FALSE;
+ if (!(flags & (FILEUTILS_FORCE|FILEUTILS_INTERACTIVE))) {
+ fprintf(stderr, "'%s' exists\n", dest);
+ return -1;
+ }
+ if (flags & FILEUTILS_INTERACTIVE) {
+ fprintf(stderr, "%s: overwrite '%s'? ", applet_name, dest);
+ if (!bb_ask_confirmation())
+ return 0; // not allowed to overwrite
}
+ if (unlink(dest) < 0) {
+ bb_perror_msg("cannot remove '%s'", dest);
+ return -1; // error
+ }
+ return 1; // ok (to try again)
+}
- if (followLinks == TRUE)
- status = stat(destName, &dstStatBuf);
- else
- status = lstat(destName, &dstStatBuf);
+int copy_file(const char *source, const char *dest, int flags)
+{
+ struct stat source_stat;
+ struct stat dest_stat;
+ int status = 0;
+ signed char dest_exists = 0;
+ signed char ovr;
- if (status < 0 || forceFlag==TRUE) {
- unlink(destName);
- dstStatBuf.st_ino = -1;
- dstStatBuf.st_dev = -1;
- }
+#define FLAGS_DEREF (flags & FILEUTILS_DEREFERENCE)
- if ((srcStatBuf.st_dev == dstStatBuf.st_dev) &&
- (srcStatBuf.st_ino == dstStatBuf.st_ino)) {
- error_msg("Copying file \"%s\" to itself", srcName);
- return FALSE;
+ if ((FLAGS_DEREF ? stat : lstat)(source, &source_stat) < 0) {
+ // This may be a dangling symlink.
+ // Making [sym]links to dangling symlinks works, so...
+ if (flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK))
+ goto make_links;
+ bb_perror_msg("cannot stat '%s'", source);
+ return -1;
}
- if (S_ISDIR(srcStatBuf.st_mode)) {
- //fprintf(stderr, "copying directory %s to %s\n", srcName, destName);
- /* Make sure the directory is writable */
- status = mkdir(destName, 0777777 ^ umask(0));
- if (status < 0 && errno != EEXIST) {
- perror_msg("%s", destName);
- return FALSE;
- }
- } else if (S_ISLNK(srcStatBuf.st_mode)) {
- char link_val[BUFSIZ + 1];
- int link_size;
-
- //fprintf(stderr, "copying link %s to %s\n", srcName, destName);
- /* Warning: This could possibly truncate silently, to BUFSIZ chars */
- link_size = readlink(srcName, &link_val[0], BUFSIZ);
- if (link_size < 0) {
- perror_msg("%s", srcName);
- return FALSE;
- }
- link_val[link_size] = '\0';
- status = symlink(link_val, destName);
- if (status < 0) {
- perror_msg("%s", destName);
- return FALSE;
- }
-#if (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
- if (setModes == TRUE) {
- /* Try to set owner, but fail silently like GNU cp */
- lchown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid);
- }
-#endif
- return TRUE;
- } else if (S_ISFIFO(srcStatBuf.st_mode)) {
- //fprintf(stderr, "copying fifo %s to %s\n", srcName, destName);
- if (mkfifo(destName, 0644) < 0) {
- perror_msg("%s", destName);
- return FALSE;
- }
- } else if (S_ISBLK(srcStatBuf.st_mode) || S_ISCHR(srcStatBuf.st_mode)
- || S_ISSOCK(srcStatBuf.st_mode)) {
- //fprintf(stderr, "copying soc, blk, or chr %s to %s\n", srcName, destName);
- if (mknod(destName, srcStatBuf.st_mode, srcStatBuf.st_rdev) < 0) {
- perror_msg("%s", destName);
- return FALSE;
- }
- } else if (S_ISREG(srcStatBuf.st_mode)) {
- //fprintf(stderr, "copying regular file %s to %s\n", srcName, destName);
- rfd = open(srcName, O_RDONLY);
- if (rfd < 0) {
- perror_msg("%s", srcName);
- return FALSE;
- }
-
- wfd = open(destName, O_WRONLY | O_CREAT | O_TRUNC,
- srcStatBuf.st_mode);
- if (wfd < 0) {
- perror_msg("%s", destName);
- close(rfd);
- return FALSE;
- }
-
- if (copy_file_chunk(rfd, wfd, srcStatBuf.st_size)==FALSE)
- goto error_exit;
-
- close(rfd);
- if (close(wfd) < 0) {
- return FALSE;
+ if (lstat(dest, &dest_stat) < 0) {
+ if (errno != ENOENT) {
+ bb_perror_msg("cannot stat '%s'", dest);
+ return -1;
+ }
+ } else {
+ if (source_stat.st_dev == dest_stat.st_dev
+ && source_stat.st_ino == dest_stat.st_ino
+ ) {
+ bb_error_msg("'%s' and '%s' are the same file", source, dest);
+ return -1;
}
+ dest_exists = 1;
}
- if (setModes == TRUE) {
- /* This is fine, since symlinks never get here */
- if (chown(destName, srcStatBuf.st_uid, srcStatBuf.st_gid) < 0)
- perror_msg_and_die("%s", destName);
- if (chmod(destName, srcStatBuf.st_mode) < 0)
- perror_msg_and_die("%s", destName);
- times.actime = srcStatBuf.st_atime;
- times.modtime = srcStatBuf.st_mtime;
- if (utime(destName, ×) < 0)
- perror_msg_and_die("%s", destName);
+ if (S_ISDIR(source_stat.st_mode)) {
+ DIR *dp;
+ struct dirent *d;
+ mode_t saved_umask = 0;
+
+ if (!(flags & FILEUTILS_RECUR)) {
+ bb_error_msg("omitting directory '%s'", source);
+ return -1;
+ }
+
+ /* Create DEST. */
+ if (dest_exists) {
+ if (!S_ISDIR(dest_stat.st_mode)) {
+ bb_error_msg("target '%s' is not a directory", dest);
+ return -1;
+ }
+ } else {
+ mode_t mode;
+ saved_umask = umask(0);
+
+ mode = source_stat.st_mode;
+ if (!(flags & FILEUTILS_PRESERVE_STATUS))
+ mode = source_stat.st_mode & ~saved_umask;
+ mode |= S_IRWXU;
+
+ if (mkdir(dest, mode) < 0) {
+ umask(saved_umask);
+ bb_perror_msg("cannot create directory '%s'", dest);
+ return -1;
+ }
+
+ umask(saved_umask);
+ }
+
+ /* Recursively copy files in SOURCE. */
+ dp = opendir(source);
+ if (dp == NULL) {
+ status = -1;
+ goto preserve_status;
+ }
+
+ while ((d = readdir(dp)) != NULL) {
+ char *new_source, *new_dest;
+
+ new_source = concat_subpath_file(source, d->d_name);
+ if (new_source == NULL)
+ continue;
+ new_dest = concat_path_file(dest, d->d_name);
+ if (copy_file(new_source, new_dest, flags) < 0)
+ status = -1;
+ free(new_source);
+ free(new_dest);
+ }
+ closedir(dp);
+
+ if (!dest_exists
+ && chmod(dest, source_stat.st_mode & ~saved_umask) < 0
+ ) {
+ bb_perror_msg("cannot change permissions of '%s'", dest);
+ status = -1;
+ }
+
+ } else if (flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK)) {
+ int (*lf)(const char *oldpath, const char *newpath);
+ make_links:
+ // Hmm... maybe
+ // if (DEREF && MAKE_SOFTLINK) source = realpath(source) ?
+ // (but realpath returns NULL on dangling symlinks...)
+ lf = (flags & FILEUTILS_MAKE_SOFTLINK) ? symlink : link;
+ if (lf(source, dest) < 0) {
+ ovr = retry_overwrite(dest, flags);
+ if (ovr <= 0)
+ return ovr;
+ if (lf(source, dest) < 0) {
+ bb_perror_msg("cannot create link '%s'", dest);
+ return -1;
+ }
+ }
+ return 0;
+
+ } else if (S_ISREG(source_stat.st_mode)
+ // Huh? DEREF uses stat, which never returns links IIRC...
+ || (FLAGS_DEREF && S_ISLNK(source_stat.st_mode))
+ ) {
+ int src_fd;
+ int dst_fd;
+ if (ENABLE_FEATURE_PRESERVE_HARDLINKS) {
+ char *link_name;
+
+ if (!FLAGS_DEREF
+ && is_in_ino_dev_hashtable(&source_stat, &link_name)
+ ) {
+ if (link(link_name, dest) < 0) {
+ ovr = retry_overwrite(dest, flags);
+ if (ovr <= 0)
+ return ovr;
+ if (link(link_name, dest) < 0) {
+ bb_perror_msg("cannot create link '%s'", dest);
+ return -1;
+ }
+ }
+ return 0;
+ }
+ // TODO: probably is_in_.. and add_to_...
+ // can be combined: find_or_add_...
+ add_to_ino_dev_hashtable(&source_stat, dest);
+ }
+
+ src_fd = open(source, O_RDONLY);
+ if (src_fd == -1) {
+ bb_perror_msg("cannot open '%s'", source);
+ return -1;
+ }
+
+ // POSIX: if exists and -i, ask (w/o -i assume yes).
+ // Then open w/o EXCL.
+ // If open still fails and -f, try unlink, then try open again.
+ // Result: a mess:
+ // If dest is a softlink, we overwrite softlink's destination!
+ // (or fail, if it points to dir/nonexistent location/etc).
+ // This is strange, but POSIX-correct.
+ // coreutils cp has --remove-destination to override this...
+ dst_fd = open(dest, (flags & FILEUTILS_INTERACTIVE)
+ ? O_WRONLY|O_CREAT|O_TRUNC|O_EXCL
+ : O_WRONLY|O_CREAT|O_TRUNC, source_stat.st_mode);
+ if (dst_fd == -1) {
+ // We would not do POSIX insanity. -i asks,
+ // then _unlinks_ the offender. Presto.
+ // Or else we will end up having 3 open()s!
+ ovr = retry_overwrite(dest, flags);
+ if (ovr <= 0) {
+ close(src_fd);
+ return ovr;
+ }
+ dst_fd = open(dest, O_WRONLY|O_CREAT|O_TRUNC, source_stat.st_mode);
+ if (dst_fd == -1) {
+ bb_perror_msg("cannot open '%s'", dest);
+ close(src_fd);
+ return -1;
+ }
+ }
+
+ if (bb_copyfd_eof(src_fd, dst_fd) == -1)
+ status = -1;
+ if (close(dst_fd) < 0) {
+ bb_perror_msg("cannot close '%s'", dest);
+ status = -1;
+ }
+ if (close(src_fd) < 0) {
+ bb_perror_msg("cannot close '%s'", source);
+ status = -1;
+ }
+
+ } else if (S_ISBLK(source_stat.st_mode) || S_ISCHR(source_stat.st_mode)
+ || S_ISSOCK(source_stat.st_mode) || S_ISFIFO(source_stat.st_mode)
+ || S_ISLNK(source_stat.st_mode)
+ ) {
+ // We are lazy here, a bit lax with races...
+ if (dest_exists) {
+ ovr = retry_overwrite(dest, flags);
+ if (ovr <= 0)
+ return ovr;
+ }
+ if (S_ISFIFO(source_stat.st_mode)) {
+ if (mkfifo(dest, source_stat.st_mode) < 0) {
+ bb_perror_msg("cannot create fifo '%s'", dest);
+ return -1;
+ }
+ } else if (S_ISLNK(source_stat.st_mode)) {
+ char *lpath;
+
+ lpath = xreadlink(source);
+ if (symlink(lpath, dest) < 0) {
+ bb_perror_msg("cannot create symlink '%s'", dest);
+ free(lpath);
+ return -1;
+ }
+ free(lpath);
+
+ if (flags & FILEUTILS_PRESERVE_STATUS)
+ if (lchown(dest, source_stat.st_uid, source_stat.st_gid) < 0)
+ bb_perror_msg("cannot preserve %s of '%s'", "ownership", dest);
+
+ return 0;
+
+ } else {
+ if (mknod(dest, source_stat.st_mode, source_stat.st_rdev) < 0) {
+ bb_perror_msg("cannot create '%s'", dest);
+ return -1;
+ }
+ }
+ } else {
+ bb_error_msg("internal error: unrecognized file type");
+ return -1;
}
- return TRUE;
+ preserve_status:
- error_exit:
- perror_msg("%s", destName);
- close(rfd);
- close(wfd);
+ if (flags & FILEUTILS_PRESERVE_STATUS
+ /* Cannot happen: */
+ /* && !(flags & (FILEUTILS_MAKE_SOFTLINK|FILEUTILS_MAKE_HARDLINK)) */
+ ) {
+ struct utimbuf times;
- return FALSE;
-}
+ times.actime = source_stat.st_atime;
+ times.modtime = source_stat.st_mtime;
+ if (utime(dest, ×) < 0)
+ bb_perror_msg("cannot preserve %s of '%s'", "times", dest);
+ if (chown(dest, source_stat.st_uid, source_stat.st_gid) < 0) {
+ source_stat.st_mode &= ~(S_ISUID | S_ISGID);
+ bb_perror_msg("cannot preserve %s of '%s'", "ownership", dest);
+ }
+ if (chmod(dest, source_stat.st_mode) < 0)
+ bb_perror_msg("cannot preserve %s of '%s'", "permissions", dest);
+ }
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+ return status;
+}
projects / oweals / busybox.git / blobdiff