78b285deb6
This was broken in multiple ways. For instance, the overlay- check of identical files (name and target) was omitted for symbolic links for some reason. While at it, I fixed the stat-handling, improved the error- messages so the right paths were shown and removed the illegimite bail-out when the target-fstatat failed (we want only a warning here as well).
99 lines
2.1 KiB
C
99 lines
2.1 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <libgen.h>
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#include <string.h>
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#include <unistd.h>
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#include "util.h"
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static void
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usage(void)
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{
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eprintf("usage: %s [-f] [-L | -P | -s] target [name]\n"
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" %s [-f] [-L | -P | -s] target ... dir\n", argv0, argv0);
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}
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int
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main(int argc, char *argv[])
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{
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char *targetdir = ".", *target = NULL;
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int ret = 0, sflag = 0, fflag = 0, dirfd = AT_FDCWD,
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hastarget = 0, flags = AT_SYMLINK_FOLLOW;
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struct stat st, tst;
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ARGBEGIN {
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case 'f':
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fflag = 1;
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break;
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case 'L':
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flags |= AT_SYMLINK_FOLLOW;
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break;
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case 'P':
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flags &= ~AT_SYMLINK_FOLLOW;
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break;
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case 's':
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sflag = 1;
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break;
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default:
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usage();
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} ARGEND;
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if (!argc)
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usage();
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if (argc > 1) {
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if (!stat(argv[argc - 1], &st) && S_ISDIR(st.st_mode)) {
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if ((dirfd = open(argv[argc - 1], O_RDONLY)) < 0)
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eprintf("open %s:", argv[argc - 1]);
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targetdir = argv[argc - 1];
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if (targetdir[strlen(targetdir) - 1] == '/')
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targetdir[strlen(targetdir) - 1] = '\0';
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} else if (argc == 2) {
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hastarget = 1;
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target = argv[argc - 1];
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} else {
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eprintf("%s: not a directory\n", argv[argc - 1]);
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}
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argv[argc - 1] = NULL;
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argc--;
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}
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for (; *argv; argc--, argv++) {
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if (!hastarget)
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target = basename(*argv);
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if (stat(*argv, &st) < 0) {
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weprintf("stat %s:", *argv);
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ret = 1;
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continue;
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} else if (fstatat(dirfd, target, &tst, AT_SYMLINK_NOFOLLOW) < 0) {
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if (errno != ENOENT) {
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weprintf("fstatat %s %s:", targetdir, target);
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ret = 1;
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continue;
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}
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} else if (st.st_dev == tst.st_dev && st.st_ino == tst.st_ino) {
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weprintf("%s and %s/%s are the same file\n", *argv, targetdir, target);
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ret = 1;
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continue;
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}
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if (fflag && unlinkat(dirfd, target, 0) < 0 && errno != ENOENT) {
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weprintf("unlinkat %s %s:", targetdir, target);
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ret = 1;
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continue;
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}
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if ((sflag ? symlinkat(*argv, dirfd, target) :
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linkat(AT_FDCWD, *argv, dirfd, target, flags)) < 0) {
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weprintf("%s %s <- %s/%s:", sflag ? "symlinkat" : "linkat",
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*argv, targetdir, target);
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ret = 1;
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}
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}
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return ret;
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}
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