mirror of
https://github.com/sheumann/hush.git
synced 2024-12-30 20:29:21 +00:00
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
/* 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) MAIN_EXTERNALLY_VISIBLE;
|
|
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_strip(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_strip(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_simple_perror_msg(*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_simple_perror_msg(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_simple_perror_msg(src);
|
|
status = EXIT_FAILURE;
|
|
}
|
|
|
|
free(src_name);
|
|
|
|
} while ((++argv)[1]);
|
|
|
|
return status;
|
|
}
|