Bug #2128 ยป 0001-fixed-snaprm-command-to-avoid-removing-PFS-symlinks.patch
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static void snapshot_ls(const char *path);
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static void snapshot_del(int fsfd, hammer_tid_t tid);
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static char *dirpart(const char *path);
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static void snapshot_snaprm_by_tid(char **av, int ac, int fsfd);
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/*
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* hammer snap <path> [<note>]
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| ... | ... | |
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}
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/*
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* hammer snaprm <path> ...
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* hammer snaprm <transid> ...
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* hammer snaprm <filesystem> <transid> ...
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* hammer snaprm <snapshot path> [<snapshot path> ...]
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* hammer snaprm <transid> [<transid> ...]
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* hammer snaprm <filesystem> <transid> [<transid> ...]
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*/
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void
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hammer_cmd_snaprm(char **av, int ac)
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{
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struct stat st;
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char linkbuf[1024];
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char linkbuf[1024] = { 0 };
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intmax_t tid;
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int fsfd = -1;
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int i;
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int i = 0;
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char *dirpath;
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char *ptr;
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uint8_t remove_symlinks = 0;
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for (i = 0; i < ac; ++i) {
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if (lstat(av[i], &st) < 0) {
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tid = strtoull(av[i], &ptr, 16);
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if (*ptr) {
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err(2, "hammer snaprm: not a file or tid: %s",
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av[i]);
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/* not reached */
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// leave if no arg
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if(ac == 0) {
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err(EINVAL, "hammer snaprm: at least one argument is "
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"required");
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/* not reached */
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}
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do {
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// inspect arguments
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if (lstat(av[i], &st) == 0) {
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// argument is either a link or a path, get
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// associated PFS
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// Call: hammer snaprm <filesystem> <transid> [<transid> ...]
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if(S_ISDIR(st.st_mode)) {
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if(remove_symlinks) {
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err(EINVAL,
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"hammer snaprm: invalid argument "
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"passed, snapshot symlink "
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"expected");
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/* not reached */
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}
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assert(fsfd == -1);
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assert(i == 0);
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fsfd = open(av[0], O_RDONLY);
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if(fsfd >= 0) {
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// skip first argument
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snapshot_snaprm_by_tid(av + 1, ac - 1, fsfd);
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}
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}
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if (fsfd < 0)
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fsfd = open(".", O_RDONLY);
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snapshot_del(fsfd, tid);
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} else if (S_ISDIR(st.st_mode)) {
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if (fsfd >= 0)
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close(fsfd);
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fsfd = open(av[i], O_RDONLY);
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if (fsfd < 0) {
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err(2, "hammer snaprm: cannot open dir %s",
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av[i]);
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/* not reached */
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else if(S_ISLNK(st.st_mode)) {
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// check if link points to a version or to a PFS
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if (readlink(av[i], linkbuf, sizeof(linkbuf) - 1) < 0) {
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err(ENOENT, "hammer snaprm: cannot read softlink: "
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"%s", av[i]);
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/* not reached */
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}
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// snapshot link looks like /path/to/pfs/@@0x0000000123456789
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// PFS link looks like /path/to/@@-1:00001
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// Call: hammer snaprm <filesystem> <transid> [<transid> ...]
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// Call: hammer snaprm <snapshot path> [<snapshot path> ...]
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dirpath = strrchr(linkbuf, '@');
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if((dirpath != NULL) &&
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(dirpath > linkbuf) &&
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(*(--dirpath) == '@')) {
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// dirpath points to link target without path
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// skip leading @@
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dirpath += 2;
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tid = strtoull(dirpath, &ptr, 16);
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if(*ptr) {
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// Call: hammer snaprm <filesystem> <transid> [...]
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if(remove_symlinks) {
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err(ENOENT,
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"hammer snaprm: invalid argument passed, "
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"expect snapshot symlink");
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/* not reached */
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}
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assert(fsfd == -1);
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assert(i == 0);
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// remove snapshot, at least one transid is required
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if(ac == 1) {
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err(EINVAL, "hammer snaprm: at least on "
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"transid is required");
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/* not reached */
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}
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fsfd = open(av[0], O_RDONLY);
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if(fsfd >= 0) {
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// skip first argument
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snapshot_snaprm_by_tid(av + 1, ac - 1, fsfd);
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}
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}
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else {
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// Call: hammer snaprm <snapshot path> [...]
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// remove symlink and snapshot
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printf("Deleting snapshot 0x%016jx %s\n",
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tid, av[i]);
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fsfd = open(av[i], O_RDONLY);
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if(fsfd >= 0) {
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snapshot_del(fsfd, tid);
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remove(av[0]);
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}
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// adjust flag and counter to remove more
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// snapshots by symlink
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if((ac > 1) && (i < (ac - 1))) {
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++i;
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remove_symlinks = 1;
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}
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else {
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remove_symlinks = 0;
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}
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}
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}
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}
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} else if (S_ISLNK(st.st_mode)) {
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dirpath = dirpart(av[i]);
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bzero(linkbuf, sizeof(linkbuf));
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if (readlink(av[i], linkbuf, sizeof(linkbuf) - 1) < 0) {
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err(2, "hammer snaprm: cannot read softlink: "
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"%s", av[i]);
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else {
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err(EINVAL, "hammer snaprm: invalid parameter passed");
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/* not reached */
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}
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if (linkbuf[0] == '/') {
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free(dirpath);
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dirpath = dirpart(linkbuf);
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} else {
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asprintf(&ptr, "%s/%s", dirpath, linkbuf);
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free(dirpath);
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dirpath = dirpart(ptr);
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}
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}
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else {
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// Call: hammer snaprm <transid> [<transid> ...]
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if (fsfd >= 0)
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close(fsfd);
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fsfd = open(dirpath, O_RDONLY);
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if (fsfd < 0) {
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err(2, "hammer snaprm: cannot open dir %s",
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dirpath);
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// handle list of transids
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if(remove_symlinks) {
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err(EINVAL, "hammer snaprm: invalid argument passed, "
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"expect snapshot symlink");
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/* not reached */
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}
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if ((ptr = strrchr(linkbuf, '@')) &&
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ptr > linkbuf && ptr[-1] == '@') {
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tid = strtoull(ptr + 1, NULL, 16);
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snapshot_del(fsfd, tid);
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assert(fsfd == -1);
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assert(i == 0);
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fsfd = open(".", O_RDONLY);
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if(fsfd >= 0) {
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snapshot_snaprm_by_tid(av, ac, fsfd);
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}
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remove(av[i]);
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free(dirpath);
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} else {
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err(2, "hammer snaprm: not directory or snapshot "
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"softlink: %s", av[i]);
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/* not reached */
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}
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}
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if (fsfd >= 0)
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} while(remove_symlinks);
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if(fsfd >= 0) {
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close(fsfd);
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}
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}
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/*
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| ... | ... | |
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"hammer snaplo <path> [<note>]\t\tcreate snapshot & link, points to\n"
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"\t\t\t\t\ttarget dir\n"
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"hammer snapq <dir> [<note>]\t\tcreate snapshot, output path to stdout\n"
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"hammer snaprm <path> ...\t\tdelete snapshots; filesystem is CWD\n"
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"hammer snaprm <transid> ...\t\tdelete snapshots\n"
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"hammer snaprm <filesystem> <transid> ...\tdelete snapshots\n"
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"hammer snaprm <symlink> ...\t\tdelete snapshots by symlink\n"
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"hammer snaprm <transid> ...\t\tdelete snapshots by ID for CWD\n"
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"hammer snaprm <PFS> <transid> ...\tdelete snapshots by ID on PFS\n"
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"hammer snapls [<path> ...]\t\tlist available snapshots\n"
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"\n"
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"NOTE: Snapshots are created in filesystem meta-data, any directory\n"
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res[ptr - path] = 0;
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return(res);
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}
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/**
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* Remove all snapshots that are passed as arguments.
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*
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* Expect each argument to be a transid.
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*/
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static
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void
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snapshot_snaprm_by_tid(char **av, int ac, int fsfd)
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{
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int i;
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intmax_t tid;
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char *ptr;
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assert(fsfd >= 0);
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assert(ac > 0);
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for(i = 0; i < ac; ++i) {
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tid = strtoull(av[i], &ptr, 16);
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if(*ptr) {
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// conversion failed
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if(fsfd >= 0) {
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close(fsfd);
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}
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err(ENOENT, "hammer snaprm: not a file or tid: %s",
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av[i]);
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/* not reached */
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}
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printf("Deleting snapshot 0x%016jx\n", tid);
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snapshot_del(fsfd, tid);
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}
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}
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