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 device_name(const char *path, char **unit) {
46 if (!is_device_path(path))
49 p = unit_name_from_path(path, ".device");
57 static int mount_find_pri(struct mntent *me, int *ret) {
64 pri = hasmntopt(me, "pri");
71 r = strtoul(pri, &end, 10);
75 if (end == pri || (*end != ',' && *end != 0))
82 static int add_swap(const char *what, struct mntent *me) {
83 char _cleanup_free_ *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL;
84 FILE _cleanup_fclose_ *f = NULL;
91 r = mount_find_pri(me, &pri);
93 log_error("Failed to parse priority");
97 noauto = !!hasmntopt(me, "noauto");
98 nofail = !!hasmntopt(me, "nofail");
100 name = unit_name_from_path(what, ".swap");
104 unit = strjoin(arg_dest, "/", name, NULL);
108 f = fopen(unit, "wxe");
111 log_error("Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
113 log_error("Failed to create unit file %s: %m", unit);
117 fputs("# Automatically generated by systemd-fstab-generator\n\n"
119 "SourcePath=/etc/fstab\n"
120 "DefaultDependencies=no\n"
121 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
122 "Before=" SPECIAL_UMOUNT_TARGET "\n", f);
124 if (!noauto && !nofail)
125 fputs("Before=" SPECIAL_SWAP_TARGET "\n", f);
140 log_error("Failed to write unit file %s: %m", unit);
145 lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
149 mkdir_parents_label(lnk, 0755);
150 if (symlink(unit, lnk) < 0) {
151 log_error("Failed to create symlink %s: %m", lnk);
155 r = device_name(what, &device);
161 lnk = strjoin(arg_dest, "/", device, ".wants/", name, NULL);
165 mkdir_parents_label(lnk, 0755);
166 if (symlink(unit, lnk) < 0) {
167 log_error("Failed to create symlink %s: %m", lnk);
176 static bool mount_is_bind(struct mntent *me) {
180 hasmntopt(me, "bind") ||
181 streq(me->mnt_type, "bind") ||
182 hasmntopt(me, "rbind") ||
183 streq(me->mnt_type, "rbind");
186 static bool mount_is_network(struct mntent *me) {
190 hasmntopt(me, "_netdev") ||
191 fstype_is_network(me->mnt_type);
194 static bool mount_in_initrd(struct mntent *me) {
198 hasmntopt(me, "x-initrd.mount") ||
199 streq(me->mnt_dir, "/usr");
202 static int add_mount(const char *what, const char *where, const char *type, const char *opts,
203 int passno, bool noauto, bool nofail, bool automount, bool isbind, bool isnetwork,
204 const char *source) {
206 *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL,
207 *automount_name = NULL, *automount_unit = NULL;
208 FILE _cleanup_fclose_ *f = NULL;
210 const char *post, *pre;
218 if (streq(type, "autofs"))
221 if (!is_path(where)) {
222 log_warning("Mount point %s is not a valid path, ignoring.", where);
226 if (mount_point_is_api(where) ||
227 mount_point_ignore(where))
231 post = SPECIAL_REMOTE_FS_TARGET;
232 pre = SPECIAL_REMOTE_FS_PRE_TARGET;
234 post = SPECIAL_LOCAL_FS_TARGET;
235 pre = SPECIAL_LOCAL_FS_PRE_TARGET;
238 name = unit_name_from_path(where, ".mount");
242 unit = strjoin(arg_dest, "/", name, NULL);
246 f = fopen(unit, "wxe");
249 log_error("Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
251 log_error("Failed to create unit file %s: %m", unit);
256 "# Automatically generated by systemd-fstab-generator\n\n"
259 "DefaultDependencies=no\n",
262 if (!path_equal(where, "/"))
266 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
267 "Before=" SPECIAL_UMOUNT_TARGET "\n",
272 if (!noauto && !nofail && !automount)
289 if (!isempty(opts) &&
290 !streq(opts, "defaults"))
297 log_error("Failed to write unit file %s: %m", unit);
302 lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL);
306 mkdir_parents_label(lnk, 0755);
307 if (symlink(unit, lnk) < 0) {
308 log_error("Failed to create symlink %s: %m", lnk);
313 !path_equal(where, "/")) {
315 r = device_name(what, &device);
321 lnk = strjoin(arg_dest, "/", device, ".wants/", name, NULL);
325 mkdir_parents_label(lnk, 0755);
326 if (symlink(unit, lnk) < 0) {
327 log_error("Failed to create symlink %s: %m", lnk);
334 if (automount && !path_equal(where, "/")) {
335 automount_name = unit_name_from_path(where, ".automount");
339 automount_unit = strjoin(arg_dest, "/", automount_name, NULL);
344 f = fopen(automount_unit, "wxe");
346 log_error("Failed to create unit file %s: %m", automount_unit);
351 "# Automatically generated by systemd-fstab-generator\n\n"
354 "DefaultDependencies=no\n"
355 "Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
356 "Before=" SPECIAL_UMOUNT_TARGET " %s\n"
366 log_error("Failed to write unit file %s: %m", automount_unit);
371 lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL);
375 mkdir_parents_label(lnk, 0755);
376 if (symlink(automount_unit, lnk) < 0) {
377 log_error("Failed to create symlink %s: %m", lnk);
385 static int parse_fstab(const char *prefix, bool initrd) {
387 _cleanup_free_ char *fstab_path = NULL;
392 fstab_path = strjoin(prefix, "/etc/fstab", NULL);
393 f = setmntent(fstab_path, "r");
398 log_error("Failed to open %s/etc/fstab: %m", prefix);
402 while ((me = getmntent(f))) {
403 char _cleanup_free_ *where = NULL, *what = NULL;
406 if (initrd && !mount_in_initrd(me))
409 what = fstab_node_to_udev_node(me->mnt_fsname);
410 where = strjoin(prefix, me->mnt_dir, NULL);
411 if (!what || !where) {
417 path_kill_slashes(where);
419 log_debug("Found entry what=%s where=%s type=%s", what, where, me->mnt_type);
421 if (streq(me->mnt_type, "swap"))
422 k = add_swap(what, me);
424 bool noauto, nofail, automount, isbind, isnetwork;
426 noauto = !!hasmntopt(me, "noauto");
427 nofail = !!hasmntopt(me, "nofail");
429 hasmntopt(me, "comment=systemd.automount") ||
430 hasmntopt(me, "x-systemd.automount");
431 isbind = mount_is_bind(me);
432 isnetwork = mount_is_network(me);
434 k = add_mount(what, where, me->mnt_type, me->mnt_opts,
435 me->mnt_passno, noauto, nofail, automount,
436 isbind, isnetwork, fstab_path);
448 static int parse_new_root_from_proc_cmdline(void) {
450 _cleanup_free_ char *what = NULL, *type = NULL, *opts = NULL, *line = NULL;
454 r = read_one_line_file("/proc/cmdline", &line);
456 log_error("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
461 type = strdup("auto");
465 /* root= and roofstype= may occur more than once, the last instance should take precedence.
466 * In the case of multiple rootflags= the arguments should be concatenated */
467 FOREACH_WORD_QUOTED(w, l, line, state) {
468 char *word, *tmp_word;
470 word = strndup(w, l);
474 else if (startswith(word, "root=")) {
476 what = fstab_node_to_udev_node(word+5);
480 } else if (startswith(word, "rootfstype=")) {
482 type = strdup(word + 11);
486 } else if (startswith(word, "rootflags=")) {
488 opts = strjoin(opts, ",", word + 10, NULL);
493 } else if (streq(word, "ro") || streq(word, "rw")) {
495 opts = strjoin(opts, ",", word, NULL);
507 log_debug("Found entry what=%s where=/sysroot type=%s", what, type);
508 r = add_mount(what, "/sysroot", type, opts, 0, false, false, false,
509 false, false, "/proc/cmdline");
514 log_error("Could not find a root= entry on the kernel commandline.");
519 static int parse_proc_cmdline(void) {
520 char _cleanup_free_ *line = NULL;
525 if (detect_container(NULL) > 0)
528 r = read_one_line_file("/proc/cmdline", &line);
530 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
534 FOREACH_WORD_QUOTED(w, l, line, state) {
535 char _cleanup_free_ *word = NULL;
537 word = strndup(w, l);
541 if (startswith(word, "fstab=")) {
542 r = parse_boolean(word + 6);
544 log_warning("Failed to parse fstab switch %s. Ignoring.", word + 6);
548 } else if (startswith(word, "rd.fstab=")) {
551 r = parse_boolean(word + 6);
553 log_warning("Failed to parse fstab switch %s. Ignoring.", word + 6);
558 } else if (startswith(word, "fstab.") ||
559 (in_initrd() && startswith(word, "rd.fstab."))) {
561 log_warning("Unknown kernel switch %s. Ignoring.", word);
568 int main(int argc, char *argv[]) {
571 if (argc > 1 && argc != 4) {
572 log_error("This program takes three or no arguments.");
579 log_set_target(LOG_TARGET_SAFE);
580 log_parse_environment();
585 if (parse_proc_cmdline() < 0)
589 r = parse_new_root_from_proc_cmdline();
592 return (r < 0) ? EXIT_FAILURE : EXIT_SUCCESS;
594 k = parse_fstab("", false);
597 l = parse_fstab("/sysroot", true);
599 return (r < 0) || (k < 0) || (l < 0) ? EXIT_FAILURE : EXIT_SUCCESS;