*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * 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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config LN
+//config: bool "ln (4.9 kb)"
+//config: default y
+//config: help
+//config: ln is used to create hard or soft links between files.
+
+//applet:IF_LN(APPLET_NOEXEC(ln, ln, BB_DIR_BIN, BB_SUID_DROP, ln))
+
+//kbuild:lib-$(CONFIG_LN) += ln.o
/* BB_AUDIT SUSv3 compliant */
/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include "busybox.h"
-
-#define LN_SYMLINK 1
-#define LN_FORCE 2
-#define LN_NODEREFERENCE 4
-#define LN_BACKUP 8
-#define LN_SUFFIX 16
-
-extern int ln_main(int argc, char **argv)
+//usage:#define ln_trivial_usage
+//usage: "[OPTIONS] TARGET... LINK|DIR"
+//usage:#define ln_full_usage "\n\n"
+//usage: "Create a link LINK or DIR/TARGET to the specified TARGET(s)\n"
+//usage: "\n -s Make symlinks instead of hardlinks"
+//usage: "\n -f Remove existing destinations"
+//usage: "\n -n Don't dereference symlinks - treat like normal file"
+//usage: "\n -b Make a backup of the target (if exists) before link operation"
+//usage: "\n -S suf Use suffix instead of ~ when making backup files"
+//usage: "\n -T 2nd arg must be a DIR"
+//usage: "\n -v Verbose"
+//usage:
+//usage:#define ln_example_usage
+//usage: "$ ln -s BusyBox /tmp/ls\n"
+//usage: "$ ls -l /tmp/ls\n"
+//usage: "lrwxrwxrwx 1 root root 7 Apr 12 18:39 ls -> BusyBox*\n"
+
+#include "libbb.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
+
+#define LN_SYMLINK (1 << 0)
+#define LN_FORCE (1 << 1)
+#define LN_NODEREFERENCE (1 << 2)
+#define LN_BACKUP (1 << 3)
+#define LN_SUFFIX (1 << 4)
+#define LN_VERBOSE (1 << 5)
+#define LN_LINKFILE (1 << 6)
+
+int ln_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int ln_main(int argc, char **argv)
{
int status = EXIT_SUCCESS;
- int flag;
+ int opts;
char *last;
char *src_name;
char *src;
- char *suffix = "~";
+ char *suffix = (char*)"~";
struct stat statbuf;
int (*link_func)(const char *, const char *);
- flag = bb_getopt_ulflags(argc, argv, "sfnbS:", &suffix);
-
- if (argc == optind) {
- bb_show_usage();
- }
+ opts = getopt32(argv, "^" "sfnbS:vT" "\0" "-1", &suffix);
last = argv[argc - 1];
argv += optind;
+ argc -= optind;
- if (argc == optind + 1) {
+ if ((opts & LN_LINKFILE) && argc > 2) {
+ bb_error_msg_and_die("-T accepts 2 args max");
+ }
+
+ if (!argv[1]) {
+ /* "ln PATH/TO/FILE" -> "ln PATH/TO/FILE FILE" */
*--argv = last;
- last = bb_get_last_path_component(bb_xstrdup(last));
+ /* xstrdup is needed: "ln -s PATH/TO/FILE/" is equivalent to
+ * "ln -s PATH/TO/FILE/ FILE", not "ln -s PATH/TO/FILE FILE"
+ */
+ last = bb_get_last_path_component_strip(xstrdup(last));
}
do {
src = last;
if (is_directory(src,
- (flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
- NULL)) {
- src_name = bb_xstrdup(*argv);
- src = concat_path_file(src, bb_get_last_path_component(src_name));
+ (opts & LN_NODEREFERENCE) ^ LN_NODEREFERENCE
+ )
+ ) {
+ if (opts & LN_LINKFILE) {
+ bb_error_msg_and_die("'%s' is a directory", src);
+ }
+ src_name = xstrdup(*argv);
+ src = concat_path_file(src, bb_get_last_path_component_strip(src_name));
free(src_name);
src_name = src;
}
- if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
- bb_perror_msg(*argv);
- status = EXIT_FAILURE;
- free(src_name);
- continue;
+ if (!(opts & LN_SYMLINK) && stat(*argv, &statbuf)) {
+ // coreutils: "ln dangling_symlink new_hardlink" works
+ if (lstat(*argv, &statbuf) || !S_ISLNK(statbuf.st_mode)) {
+ bb_simple_perror_msg(*argv);
+ status = EXIT_FAILURE;
+ free(src_name);
+ continue;
+ }
}
- if (flag & LN_BACKUP) {
- char *backup = NULL;
- bb_xasprintf(&backup, "%s%s", src, suffix);
- if (rename(src, backup) < 0 && errno != ENOENT) {
- bb_perror_msg(src);
- status = EXIT_FAILURE;
- free(backup);
- continue;
- }
+ if (opts & LN_BACKUP) {
+ char *backup;
+ backup = xasprintf("%s%s", src, suffix);
+ if (rename(src, backup) < 0 && errno != ENOENT) {
+ bb_simple_perror_msg(src);
+ status = EXIT_FAILURE;
free(backup);
- /*
- * When the source and dest are both hard links to the same
- * inode, a rename may succeed even though nothing happened.
- * Therefore, always unlink().
- */
- unlink(src);
- } else if (flag & LN_FORCE) {
+ continue;
+ }
+ free(backup);
+ /*
+ * When the source and dest are both hard links to the same
+ * inode, a rename may succeed even though nothing happened.
+ * Therefore, always unlink().
+ */
+ unlink(src);
+ } else if (opts & LN_FORCE) {
unlink(src);
}
link_func = link;
- if (flag & LN_SYMLINK) {
+ if (opts & LN_SYMLINK) {
link_func = symlink;
}
+ if (opts & LN_VERBOSE) {
+ printf("'%s' -> '%s'\n", src, *argv);
+ }
+
if (link_func(*argv, src) != 0) {
- bb_perror_msg(src);
+ bb_simple_perror_msg(src);
status = EXIT_FAILURE;
}
free(src_name);
-
} while ((++argv)[1]);
return status;
projects / oweals / busybox.git / blobdiff