1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2012 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
30 #include "unit-name.h"
31 #include "path-util.h"
32 #include "mount-setup.h"
38 static const char *arg_dest = "/tmp";
39 static bool arg_enabled = true;
41 static int mount_find_pri(struct mntent *me, int *ret) {
48 pri = hasmntopt(me, "pri");
55 r = strtoul(pri, &end, 10);
59 if (end == pri || (*end != ',' && *end != 0))
66 static int add_swap(const char *what, struct mntent *me) {
67 _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
68 _cleanup_fclose_ FILE *f = NULL;
75 r = mount_find_pri(me, &pri);
77 log_error("Failed to parse priority");
81 noauto = !!hasmntopt(me, "noauto");
83 name = unit_name_from_path(what, ".swap");
87 unit = strjoin(arg_dest, "/", name, NULL);
91 f = fopen(unit, "wxe");
94 log_error("Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
96 log_error("Failed to create unit file %s: %m", unit);
101 "# Automatically generated by systemd-fstab-generator\n\n"
103 "SourcePath=/etc/fstab\n\n"
115 log_error("Failed to write unit file %s: %m", unit);
120 lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
124 mkdir_parents_label(lnk, 0755);
125 if (symlink(unit, lnk) < 0) {
126 log_error("Failed to create symlink %s: %m", lnk);
134 static bool mount_is_network(struct mntent *me) {
138 hasmntopt(me, "_netdev") ||
139 fstype_is_network(me->mnt_type);
142 static bool mount_in_initrd(struct mntent *me) {
146 hasmntopt(me, "x-initrd.mount") ||
147 streq(me->mnt_dir, "/usr");
150 static int add_mount(
160 const char *source) {
162 *name = NULL, *unit = NULL, *lnk = NULL,
163 *automount_name = NULL, *automount_unit = NULL;
164 _cleanup_fclose_ FILE *f = NULL;
172 if (streq(type, "autofs"))
175 if (!is_path(where)) {
176 log_warning("Mount point %s is not a valid path, ignoring.", where);
180 if (mount_point_is_api(where) ||
181 mount_point_ignore(where))
184 name = unit_name_from_path(where, ".mount");
188 unit = strjoin(arg_dest, "/", name, NULL);
192 f = fopen(unit, "wxe");
195 log_error("Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
197 log_error("Failed to create unit file %s: %m", unit);
202 "# Automatically generated by systemd-fstab-generator\n\n"
207 if (post && !noauto && !nofail && !automount)
224 if (!isempty(opts) &&
225 !streq(opts, "defaults"))
232 log_error("Failed to write unit file %s: %m", unit);
238 lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL);
242 mkdir_parents_label(lnk, 0755);
243 if (symlink(unit, lnk) < 0) {
244 log_error("Failed to create symlink %s: %m", lnk);
250 if (automount && !path_equal(where, "/")) {
251 automount_name = unit_name_from_path(where, ".automount");
255 automount_unit = strjoin(arg_dest, "/", automount_name, NULL);
260 f = fopen(automount_unit, "wxe");
262 log_error("Failed to create unit file %s: %m", automount_unit);
267 "# Automatically generated by systemd-fstab-generator\n\n"
284 log_error("Failed to write unit file %s: %m", automount_unit);
289 lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL);
293 mkdir_parents_label(lnk, 0755);
294 if (symlink(automount_unit, lnk) < 0) {
295 log_error("Failed to create symlink %s: %m", lnk);
303 static int parse_fstab(const char *prefix, bool initrd) {
305 _cleanup_endmntent_ FILE *f;
309 fstab_path = strappenda(strempty(prefix), "/etc/fstab");
310 f = setmntent(fstab_path, "r");
315 log_error("Failed to open %s/etc/fstab: %m", strempty(prefix));
319 while ((me = getmntent(f))) {
320 _cleanup_free_ char *where = NULL, *what = NULL;
323 if (initrd && !mount_in_initrd(me))
326 what = fstab_node_to_udev_node(me->mnt_fsname);
327 where = strjoin(strempty(prefix), me->mnt_dir, NULL);
332 path_kill_slashes(where);
334 log_debug("Found entry what=%s where=%s type=%s", what, where, me->mnt_type);
336 if (streq(me->mnt_type, "swap"))
337 k = add_swap(what, me);
339 bool noauto, nofail, automount;
342 noauto = !!hasmntopt(me, "noauto");
343 nofail = !!hasmntopt(me, "nofail");
345 hasmntopt(me, "comment=systemd.automount") ||
346 hasmntopt(me, "x-systemd.automount");
349 post = SPECIAL_INITRD_FS_TARGET;
350 } else if (mount_in_initrd(me)) {
351 post = SPECIAL_INITRD_ROOT_FS_TARGET;
352 } else if (mount_is_network(me)) {
353 post = SPECIAL_REMOTE_FS_TARGET;
355 post = SPECIAL_LOCAL_FS_TARGET;
358 k = add_mount(what, where, me->mnt_type, me->mnt_opts,
359 me->mnt_passno, noauto, nofail, automount,
370 static int parse_new_root_from_proc_cmdline(void) {
371 _cleanup_free_ char *what = NULL, *type = NULL, *opts = NULL, *line = NULL;
377 r = read_one_line_file("/proc/cmdline", &line);
379 log_error("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
384 type = strdup("auto");
388 /* root= and roofstype= may occur more than once, the last instance should take precedence.
389 * In the case of multiple rootflags= the arguments should be concatenated */
390 FOREACH_WORD_QUOTED(w, l, line, state) {
391 _cleanup_free_ char *word;
393 word = strndup(w, l);
397 else if (startswith(word, "root=")) {
399 what = fstab_node_to_udev_node(word+5);
403 } else if (startswith(word, "rootfstype=")) {
405 type = strdup(word + 11);
409 } else if (startswith(word, "rootflags=")) {
412 o = strjoin(opts, ",", word + 10, NULL);
419 } else if (streq(word, "ro") || streq(word, "rw")) {
422 o = strjoin(opts, ",", word, NULL);
431 noauto = !!strstr(opts, "noauto");
432 nofail = !!strstr(opts, "nofail");
435 log_debug("Could not find a root= entry on the kernel commandline.");
439 if (what[0] != '/') {
440 log_debug("Skipping entry what=%s where=/sysroot type=%s", what, type);
444 log_debug("Found entry what=%s where=/sysroot type=%s", what, type);
445 r = add_mount(what, "/sysroot", type, opts, 0, noauto, nofail, false,
446 SPECIAL_INITRD_ROOT_FS_TARGET, "/proc/cmdline");
448 return (r < 0) ? r : 0;
451 static int parse_proc_cmdline(void) {
452 _cleanup_free_ char *line = NULL;
457 if (detect_container(NULL) > 0)
460 r = read_one_line_file("/proc/cmdline", &line);
462 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
466 FOREACH_WORD_QUOTED(w, l, line, state) {
467 _cleanup_free_ char *word = NULL;
469 word = strndup(w, l);
473 if (startswith(word, "fstab=")) {
474 r = parse_boolean(word + 6);
476 log_warning("Failed to parse fstab switch %s. Ignoring.", word + 6);
480 } else if (startswith(word, "rd.fstab=")) {
483 r = parse_boolean(word + 9);
485 log_warning("Failed to parse fstab switch %s. Ignoring.", word + 9);
490 } else if (startswith(word, "fstab.") ||
491 (in_initrd() && startswith(word, "rd.fstab."))) {
493 log_warning("Unknown kernel switch %s. Ignoring.", word);
500 int main(int argc, char *argv[]) {
503 if (argc > 1 && argc != 4) {
504 log_error("This program takes three or no arguments.");
511 log_set_target(LOG_TARGET_SAFE);
512 log_parse_environment();
517 if (parse_proc_cmdline() < 0)
521 r = parse_new_root_from_proc_cmdline();
524 return (r < 0) ? EXIT_FAILURE : EXIT_SUCCESS;
526 k = parse_fstab(NULL, false);
529 l = parse_fstab("/sysroot", true);
531 return (r < 0) || (k < 0) || (l < 0) ? EXIT_FAILURE : EXIT_SUCCESS;