2 * Copyright (c) 2008 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sbin/hammer/cmd_snapshot.c,v 1.7 2008/07/10 18:47:22 mneumann Exp $
38 #include <sys/param.h>
39 #include <sys/mount.h>
40 #include <sys/types.h>
46 #define DEFAULT_SNAPSHOT_NAME "snap-%Y%m%d-%H%M"
48 static void snapshot_usage(int exit_code);
51 * snapshot <softlink-dir-in-filesystem>
52 * snapshot <filesystem> <softlink-dir>
55 hammer_cmd_snapshot(char **av, int ac)
57 const char *filesystem;
58 const char *softlink_dir;
62 struct hammer_ioc_synctid synctid;
76 if (stat(softlink_dir, &st) == 0) {
77 if (!S_ISDIR(st.st_mode))
78 err(2, "File %s already exists", softlink_dir);
80 if (filesystem == NULL) {
81 if (statfs(softlink_dir, &buf) != 0) {
82 err(2, "Unable to determine filesystem of %s",
85 filesystem = buf.f_mntonname;
88 softlink_fmt = malloc(strlen(softlink_dir) + 1 + 1 +
89 sizeof(DEFAULT_SNAPSHOT_NAME));
90 if (softlink_fmt == NULL)
91 err(2, "Failed to allocate string");
93 strcpy(softlink_fmt, softlink_dir);
94 if (softlink_fmt[strlen(softlink_fmt)-1] != '/')
95 strcat(softlink_fmt, "/");
96 strcat(softlink_fmt, DEFAULT_SNAPSHOT_NAME);
98 softlink_fmt = strdup(softlink_dir);
100 if (filesystem == NULL) {
102 * strip-off last '/path' segment to get the softlink
103 * directory, which we need to determine the filesystem
106 char *pos = strrchr(softlink_fmt, '/');
110 if (stat(softlink_fmt, &st) != 0 ||
111 !S_ISDIR(st.st_mode)) {
112 err(2, "Unable to determine softlink dir %s",
115 if (statfs(softlink_fmt, &buf) != 0) {
116 err(2, "Unable to determine filesystem of %s",
119 filesystem = buf.f_mntonname;
130 bzero(&synctid, sizeof(synctid));
131 synctid.op = HAMMER_SYNCTID_SYNC2;
132 int fd = open(filesystem, O_RDONLY);
134 err(2, "Unable to open %s", filesystem);
135 if (ioctl(fd, HAMMERIOC_SYNCTID, &synctid) < 0)
136 err(2, "Synctid %s failed", filesystem);
139 asprintf(&from, "%s/@@0x%016jx", filesystem, (uintmax_t)synctid.tid);
141 err(2, "Couldn't generate string");
143 int sz = strlen(softlink_fmt) + 50;
146 err(2, "Failed to allocate string");
148 time_t t = time(NULL);
149 if (strftime(to, sz, softlink_fmt, localtime(&t)) == 0)
150 err(2, "String buffer too small");
152 if (symlink(from, to) != 0)
153 err(2, "Unable to symlink %s to %s", from, to);
164 snapshot_usage(int exit_code)
166 fprintf(stderr, "hammer snapshot <snapshot-dir-in-filesystem>\n");
167 fprintf(stderr, "hammer snapshot <filesystem> <snapshot-dir>\n");