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/* vi: set sw=4 ts=4: */
/*
* Mini ln implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* BB_AUDIT SUSv3 compliant */
/* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
#include "libbb.h"
/* This is a NOEXEC applet. Be very careful! */
#define LN_SYMLINK 1
#define LN_FORCE 2
#define LN_NODEREFERENCE 4
#define LN_BACKUP 8
#define LN_SUFFIX 16
int ln_main(int argc, char **argv);
int ln_main(int argc, char **argv)
{
int status = EXIT_SUCCESS;
int flag;
char *last;
char *src_name;
char *src;
char *suffix = (char*)"~";
struct stat statbuf;
int (*link_func)(const char *, const char *);
flag = getopt32(argv, "sfnbS:", &suffix);
if (argc == optind) {
bb_show_usage();
}
last = argv[argc - 1];
argv += optind;
if (argc == optind + 1) {
*--argv = last;
last = bb_get_last_path_component(xstrdup(last));
}
do {
src_name = NULL;
src = last;
if (is_directory(src,
(flag & LN_NODEREFERENCE) ^ LN_NODEREFERENCE,
NULL)
) {
src_name = xstrdup(*argv);
src = concat_path_file(src, bb_get_last_path_component(src_name));
free(src_name);
src_name = src;
}
if (!(flag & LN_SYMLINK) && stat(*argv, &statbuf)) {
// coreutils: "ln dangling_symlink new_hardlink" works
if (lstat(*argv, &statbuf) || !S_ISLNK(statbuf.st_mode)) {
bb_perror_msg("%s", *argv);
status = EXIT_FAILURE;
free(src_name);
continue;
}
}
if (flag & LN_BACKUP) {
char *backup;
backup = xasprintf("%s%s", src, suffix);
if (rename(src, backup) < 0 && errno != ENOENT) {
bb_perror_msg("%s", src);
status = EXIT_FAILURE;
free(backup);
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 (flag & LN_FORCE) {
unlink(src);
}
link_func = link;
if (flag & LN_SYMLINK) {
link_func = symlink;
}
if (link_func(*argv, src) != 0) {
bb_perror_msg("%s", src);
status = EXIT_FAILURE;
}
free(src_name);
} while ((++argv)[1]);
return status;
}
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