1 /* vi: set sw=4 ts=4: */
3 * Mini ln implementation for busybox
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 /* BB_AUDIT SUSv3 compliant */
11 /* BB_AUDIT GNU options missing: -d, -F, -i, and -v. */
12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/ln.html */
16 /* This is a NOEXEC applet. Be very careful! */
21 #define LN_NODEREFERENCE 4
25 int ln_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
26 int ln_main(int argc
, char **argv
)
28 int status
= EXIT_SUCCESS
;
33 char *suffix
= (char*)"~";
35 int (*link_func
)(const char *, const char *);
37 flag
= getopt32(argv
, "sfnbS:", &suffix
);
43 last
= argv
[argc
- 1];
46 if (argc
== optind
+ 1) {
48 last
= bb_get_last_path_component_strip(xstrdup(last
));
56 (flag
& LN_NODEREFERENCE
) ^ LN_NODEREFERENCE
,
59 src_name
= xstrdup(*argv
);
60 src
= concat_path_file(src
, bb_get_last_path_component_strip(src_name
));
64 if (!(flag
& LN_SYMLINK
) && stat(*argv
, &statbuf
)) {
65 // coreutils: "ln dangling_symlink new_hardlink" works
66 if (lstat(*argv
, &statbuf
) || !S_ISLNK(statbuf
.st_mode
)) {
67 bb_simple_perror_msg(*argv
);
68 status
= EXIT_FAILURE
;
74 if (flag
& LN_BACKUP
) {
76 backup
= xasprintf("%s%s", src
, suffix
);
77 if (rename(src
, backup
) < 0 && errno
!= ENOENT
) {
78 bb_simple_perror_msg(src
);
79 status
= EXIT_FAILURE
;
85 * When the source and dest are both hard links to the same
86 * inode, a rename may succeed even though nothing happened.
87 * Therefore, always unlink().
90 } else if (flag
& LN_FORCE
) {
95 if (flag
& LN_SYMLINK
) {
99 if (link_func(*argv
, src
) != 0) {
100 bb_simple_perror_msg(src
);
101 status
= EXIT_FAILURE
;
106 } while ((++argv
)[1]);