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Diffstat (limited to 'src/systemd-fstab-generator/fstab-generator.c')
-rw-r--r--src/systemd-fstab-generator/fstab-generator.c713
1 files changed, 713 insertions, 0 deletions
diff --git a/src/systemd-fstab-generator/fstab-generator.c b/src/systemd-fstab-generator/fstab-generator.c
new file mode 100644
index 0000000000..108522873e
--- /dev/null
+++ b/src/systemd-fstab-generator/fstab-generator.c
@@ -0,0 +1,713 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2012 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <mntent.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fstab-util.h"
+#include "generator.h"
+#include "log.h"
+#include "mkdir.h"
+#include "mount-setup.h"
+#include "mount-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "special.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "unit-name.h"
+#include "util.h"
+#include "virt.h"
+
+static const char *arg_dest = "/tmp";
+static bool arg_fstab_enabled = true;
+static char *arg_root_what = NULL;
+static char *arg_root_fstype = NULL;
+static char *arg_root_options = NULL;
+static int arg_root_rw = -1;
+static char *arg_usr_what = NULL;
+static char *arg_usr_fstype = NULL;
+static char *arg_usr_options = NULL;
+
+static int add_swap(
+ const char *what,
+ struct mntent *me,
+ bool noauto,
+ bool nofail) {
+
+ _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ assert(what);
+ assert(me);
+
+ if (access("/proc/swaps", F_OK) < 0) {
+ log_info("Swap not supported, ignoring fstab swap entry for %s.", what);
+ return 0;
+ }
+
+ if (detect_container() > 0) {
+ log_info("Running in a container, ignoring fstab swap entry for %s.", what);
+ return 0;
+ }
+
+ r = unit_name_from_path(what, ".swap", &name);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ unit = strjoin(arg_dest, "/", name, NULL);
+ if (!unit)
+ return log_oom();
+
+ f = fopen(unit, "wxe");
+ if (!f) {
+ if (errno == EEXIST)
+ log_error("Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
+ else
+ log_error_errno(errno, "Failed to create unit file %s: %m", unit);
+ return -errno;
+ }
+
+ fprintf(f,
+ "# Automatically generated by systemd-fstab-generator\n\n"
+ "[Unit]\n"
+ "SourcePath=/etc/fstab\n"
+ "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n"
+ "[Swap]\n"
+ "What=%s\n",
+ what);
+
+ if (!isempty(me->mnt_opts) && !streq(me->mnt_opts, "defaults"))
+ fprintf(f, "Options=%s\n", me->mnt_opts);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", unit);
+
+ /* use what as where, to have a nicer error message */
+ r = generator_write_timeouts(arg_dest, what, what, me->mnt_opts, NULL);
+ if (r < 0)
+ return r;
+
+ if (!noauto) {
+ lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET,
+ nofail ? ".wants/" : ".requires/", name, NULL);
+ if (!lnk)
+ return log_oom();
+
+ mkdir_parents_label(lnk, 0755);
+ if (symlink(unit, lnk) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+ }
+
+ return 0;
+}
+
+static bool mount_is_network(struct mntent *me) {
+ assert(me);
+
+ return fstab_test_option(me->mnt_opts, "_netdev\0") ||
+ fstype_is_network(me->mnt_type);
+}
+
+static bool mount_in_initrd(struct mntent *me) {
+ assert(me);
+
+ return fstab_test_option(me->mnt_opts, "x-initrd.mount\0") ||
+ streq(me->mnt_dir, "/usr");
+}
+
+static int write_idle_timeout(FILE *f, const char *where, const char *opts) {
+ _cleanup_free_ char *timeout = NULL;
+ char timespan[FORMAT_TIMESPAN_MAX];
+ usec_t u;
+ int r;
+
+ r = fstab_filter_options(opts, "x-systemd.idle-timeout\0", NULL, &timeout, NULL);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse options: %m");
+ if (r == 0)
+ return 0;
+
+ r = parse_sec(timeout, &u);
+ if (r < 0) {
+ log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
+ return 0;
+ }
+
+ fprintf(f, "TimeoutIdleSec=%s\n", format_timespan(timespan, sizeof(timespan), u, 0));
+
+ return 0;
+}
+
+static int write_requires_after(FILE *f, const char *opts) {
+ _cleanup_strv_free_ char **names = NULL, **units = NULL;
+ _cleanup_free_ char *res = NULL;
+ char **s;
+ int r;
+
+ assert(f);
+ assert(opts);
+
+ r = fstab_extract_values(opts, "x-systemd.requires", &names);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse options: %m");
+ if (r == 0)
+ return 0;
+
+ STRV_FOREACH(s, names) {
+ char *x;
+
+ r = unit_name_mangle_with_suffix(*s, UNIT_NAME_NOGLOB, ".mount", &x);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+ r = strv_consume(&units, x);
+ if (r < 0)
+ return log_oom();
+ }
+
+ if (units) {
+ res = strv_join(units, " ");
+ if (!res)
+ return log_oom();
+ fprintf(f, "After=%1$s\nRequires=%1$s\n", res);
+ }
+
+ return 0;
+}
+
+static int write_requires_mounts_for(FILE *f, const char *opts) {
+ _cleanup_strv_free_ char **paths = NULL;
+ _cleanup_free_ char *res = NULL;
+ int r;
+
+ assert(f);
+ assert(opts);
+
+ r = fstab_extract_values(opts, "x-systemd.requires-mounts-for", &paths);
+ if (r < 0)
+ return log_warning_errno(r, "Failed to parse options: %m");
+ if (r == 0)
+ return 0;
+
+ res = strv_join(paths, " ");
+ if (!res)
+ return log_oom();
+
+ fprintf(f, "RequiresMountsFor=%s\n", res);
+
+ return 0;
+}
+
+static int add_mount(
+ const char *what,
+ const char *where,
+ const char *fstype,
+ const char *opts,
+ int passno,
+ bool noauto,
+ bool nofail,
+ bool automount,
+ const char *post,
+ const char *source) {
+
+ _cleanup_free_ char
+ *name = NULL, *unit = NULL, *lnk = NULL,
+ *automount_name = NULL, *automount_unit = NULL,
+ *filtered = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ assert(what);
+ assert(where);
+ assert(opts);
+ assert(post);
+ assert(source);
+
+ if (streq_ptr(fstype, "autofs"))
+ return 0;
+
+ if (!is_path(where)) {
+ log_warning("Mount point %s is not a valid path, ignoring.", where);
+ return 0;
+ }
+
+ if (mount_point_is_api(where) ||
+ mount_point_ignore(where))
+ return 0;
+
+ if (path_equal(where, "/")) {
+ if (noauto)
+ log_warning("Ignoring \"noauto\" for root device");
+ if (nofail)
+ log_warning("Ignoring \"nofail\" for root device");
+ if (automount)
+ log_warning("Ignoring automount option for root device");
+
+ noauto = nofail = automount = false;
+ }
+
+ r = unit_name_from_path(where, ".mount", &name);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ unit = strjoin(arg_dest, "/", name, NULL);
+ if (!unit)
+ return log_oom();
+
+ f = fopen(unit, "wxe");
+ if (!f) {
+ if (errno == EEXIST)
+ log_error("Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
+ else
+ log_error_errno(errno, "Failed to create unit file %s: %m", unit);
+ return -errno;
+ }
+
+ fprintf(f,
+ "# Automatically generated by systemd-fstab-generator\n\n"
+ "[Unit]\n"
+ "SourcePath=%s\n"
+ "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n",
+ source);
+
+ if (!noauto && !nofail && !automount)
+ fprintf(f, "Before=%s\n", post);
+
+ if (!automount && opts) {
+ r = write_requires_after(f, opts);
+ if (r < 0)
+ return r;
+ r = write_requires_mounts_for(f, opts);
+ if (r < 0)
+ return r;
+ }
+
+ if (passno != 0) {
+ r = generator_write_fsck_deps(f, arg_dest, what, where, fstype);
+ if (r < 0)
+ return r;
+ }
+
+ fprintf(f,
+ "\n"
+ "[Mount]\n"
+ "What=%s\n"
+ "Where=%s\n",
+ what,
+ where);
+
+ if (!isempty(fstype) && !streq(fstype, "auto"))
+ fprintf(f, "Type=%s\n", fstype);
+
+ r = generator_write_timeouts(arg_dest, what, where, opts, &filtered);
+ if (r < 0)
+ return r;
+
+ if (!isempty(filtered) && !streq(filtered, "defaults"))
+ fprintf(f, "Options=%s\n", filtered);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", unit);
+
+ if (!noauto && !automount) {
+ lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", name, NULL);
+ if (!lnk)
+ return log_oom();
+
+ mkdir_parents_label(lnk, 0755);
+ if (symlink(unit, lnk) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+ }
+
+ if (automount) {
+ r = unit_name_from_path(where, ".automount", &automount_name);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ automount_unit = strjoin(arg_dest, "/", automount_name, NULL);
+ if (!automount_unit)
+ return log_oom();
+
+ fclose(f);
+ f = fopen(automount_unit, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m", automount_unit);
+
+ fprintf(f,
+ "# Automatically generated by systemd-fstab-generator\n\n"
+ "[Unit]\n"
+ "SourcePath=%s\n"
+ "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n",
+ source);
+
+ fprintf(f, "Before=%s\n", post);
+
+ if (opts) {
+ r = write_requires_after(f, opts);
+ if (r < 0)
+ return r;
+ r = write_requires_mounts_for(f, opts);
+ if (r < 0)
+ return r;
+ }
+
+ fprintf(f,
+ "\n"
+ "[Automount]\n"
+ "Where=%s\n",
+ where);
+
+ r = write_idle_timeout(f, where, opts);
+ if (r < 0)
+ return r;
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", automount_unit);
+
+ free(lnk);
+ lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL);
+ if (!lnk)
+ return log_oom();
+
+ mkdir_parents_label(lnk, 0755);
+ if (symlink(automount_unit, lnk) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+ }
+
+ return 0;
+}
+
+static int parse_fstab(bool initrd) {
+ _cleanup_endmntent_ FILE *f = NULL;
+ const char *fstab_path;
+ struct mntent *me;
+ int r = 0;
+
+ fstab_path = initrd ? "/sysroot/etc/fstab" : "/etc/fstab";
+ f = setmntent(fstab_path, "re");
+ if (!f) {
+ if (errno == ENOENT)
+ return 0;
+
+ log_error_errno(errno, "Failed to open %s: %m", fstab_path);
+ return -errno;
+ }
+
+ while ((me = getmntent(f))) {
+ _cleanup_free_ char *where = NULL, *what = NULL;
+ bool noauto, nofail;
+ int k;
+
+ if (initrd && !mount_in_initrd(me))
+ continue;
+
+ what = fstab_node_to_udev_node(me->mnt_fsname);
+ if (!what)
+ return log_oom();
+
+ if (is_device_path(what) && path_is_read_only_fs("sys") > 0) {
+ log_info("Running in a container, ignoring fstab device entry for %s.", what);
+ continue;
+ }
+
+ where = initrd ? strappend("/sysroot/", me->mnt_dir) : strdup(me->mnt_dir);
+ if (!where)
+ return log_oom();
+
+ if (is_path(where))
+ path_kill_slashes(where);
+
+ noauto = fstab_test_yes_no_option(me->mnt_opts, "noauto\0" "auto\0");
+ nofail = fstab_test_yes_no_option(me->mnt_opts, "nofail\0" "fail\0");
+ log_debug("Found entry what=%s where=%s type=%s nofail=%s noauto=%s",
+ what, where, me->mnt_type,
+ yes_no(noauto), yes_no(nofail));
+
+ if (streq(me->mnt_type, "swap"))
+ k = add_swap(what, me, noauto, nofail);
+ else {
+ bool automount;
+ const char *post;
+
+ automount = fstab_test_option(me->mnt_opts,
+ "comment=systemd.automount\0"
+ "x-systemd.automount\0");
+ if (initrd)
+ post = SPECIAL_INITRD_FS_TARGET;
+ else if (mount_is_network(me))
+ post = SPECIAL_REMOTE_FS_TARGET;
+ else
+ post = SPECIAL_LOCAL_FS_TARGET;
+
+ k = add_mount(what,
+ where,
+ me->mnt_type,
+ me->mnt_opts,
+ me->mnt_passno,
+ noauto,
+ nofail,
+ automount,
+ post,
+ fstab_path);
+ }
+
+ if (k < 0)
+ r = k;
+ }
+
+ return r;
+}
+
+static int add_sysroot_mount(void) {
+ _cleanup_free_ char *what = NULL;
+ const char *opts;
+ int r;
+
+ if (isempty(arg_root_what)) {
+ log_debug("Could not find a root= entry on the kernel command line.");
+ return 0;
+ }
+
+ what = fstab_node_to_udev_node(arg_root_what);
+ if (!what)
+ return log_oom();
+
+ if (!arg_root_options)
+ opts = arg_root_rw > 0 ? "rw" : "ro";
+ else if (arg_root_rw >= 0 ||
+ !fstab_test_option(arg_root_options, "ro\0" "rw\0"))
+ opts = strjoina(arg_root_options, ",", arg_root_rw > 0 ? "rw" : "ro");
+ else
+ opts = arg_root_options;
+
+ log_debug("Found entry what=%s where=/sysroot type=%s", what, strna(arg_root_fstype));
+
+ if (is_device_path(what)) {
+ r = generator_write_initrd_root_device_deps(arg_dest, what);
+ if (r < 0)
+ return r;
+ }
+
+ return add_mount(what,
+ "/sysroot",
+ arg_root_fstype,
+ opts,
+ is_device_path(what) ? 1 : 0,
+ false,
+ false,
+ false,
+ SPECIAL_INITRD_ROOT_FS_TARGET,
+ "/proc/cmdline");
+}
+
+static int add_sysroot_usr_mount(void) {
+ _cleanup_free_ char *what = NULL;
+ const char *opts;
+
+ if (!arg_usr_what && !arg_usr_fstype && !arg_usr_options)
+ return 0;
+
+ if (arg_root_what && !arg_usr_what) {
+ arg_usr_what = strdup(arg_root_what);
+
+ if (!arg_usr_what)
+ return log_oom();
+ }
+
+ if (arg_root_fstype && !arg_usr_fstype) {
+ arg_usr_fstype = strdup(arg_root_fstype);
+
+ if (!arg_usr_fstype)
+ return log_oom();
+ }
+
+ if (arg_root_options && !arg_usr_options) {
+ arg_usr_options = strdup(arg_root_options);
+
+ if (!arg_usr_options)
+ return log_oom();
+ }
+
+ if (!arg_usr_what)
+ return 0;
+
+ what = fstab_node_to_udev_node(arg_usr_what);
+ if (!path_is_absolute(what)) {
+ log_debug("Skipping entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype));
+ return -1;
+ }
+
+ if (!arg_usr_options)
+ opts = arg_root_rw > 0 ? "rw" : "ro";
+ else if (!fstab_test_option(arg_usr_options, "ro\0" "rw\0"))
+ opts = strjoina(arg_usr_options, ",", arg_root_rw > 0 ? "rw" : "ro");
+ else
+ opts = arg_usr_options;
+
+ log_debug("Found entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype));
+ return add_mount(what,
+ "/sysroot/usr",
+ arg_usr_fstype,
+ opts,
+ 1,
+ false,
+ false,
+ false,
+ SPECIAL_INITRD_FS_TARGET,
+ "/proc/cmdline");
+}
+
+static int parse_proc_cmdline_item(const char *key, const char *value) {
+ int r;
+
+ /* root=, usr=, usrfstype= and roofstype= may occur more than once, the last
+ * instance should take precedence. In the case of multiple rootflags=
+ * or usrflags= the arguments should be concatenated */
+
+ if (STR_IN_SET(key, "fstab", "rd.fstab") && value) {
+
+ r = parse_boolean(value);
+ if (r < 0)
+ log_warning("Failed to parse fstab switch %s. Ignoring.", value);
+ else
+ arg_fstab_enabled = r;
+
+ } else if (streq(key, "root") && value) {
+
+ if (free_and_strdup(&arg_root_what, value) < 0)
+ return log_oom();
+
+ } else if (streq(key, "rootfstype") && value) {
+
+ if (free_and_strdup(&arg_root_fstype, value) < 0)
+ return log_oom();
+
+ } else if (streq(key, "rootflags") && value) {
+ char *o;
+
+ o = arg_root_options ?
+ strjoin(arg_root_options, ",", value, NULL) :
+ strdup(value);
+ if (!o)
+ return log_oom();
+
+ free(arg_root_options);
+ arg_root_options = o;
+
+ } else if (streq(key, "mount.usr") && value) {
+
+ if (free_and_strdup(&arg_usr_what, value) < 0)
+ return log_oom();
+
+ } else if (streq(key, "mount.usrfstype") && value) {
+
+ if (free_and_strdup(&arg_usr_fstype, value) < 0)
+ return log_oom();
+
+ } else if (streq(key, "mount.usrflags") && value) {
+ char *o;
+
+ o = arg_usr_options ?
+ strjoin(arg_usr_options, ",", value, NULL) :
+ strdup(value);
+ if (!o)
+ return log_oom();
+
+ free(arg_usr_options);
+ arg_usr_options = o;
+
+ } else if (streq(key, "rw") && !value)
+ arg_root_rw = true;
+ else if (streq(key, "ro") && !value)
+ arg_root_rw = false;
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ int r = 0;
+
+ if (argc > 1 && argc != 4) {
+ log_error("This program takes three or no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ if (argc > 1)
+ arg_dest = argv[1];
+
+ log_set_target(LOG_TARGET_SAFE);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ r = parse_proc_cmdline(parse_proc_cmdline_item);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+
+ /* Always honour root= and usr= in the kernel command line if we are in an initrd */
+ if (in_initrd()) {
+ r = add_sysroot_mount();
+ if (r == 0)
+ r = add_sysroot_usr_mount();
+ }
+
+ /* Honour /etc/fstab only when that's enabled */
+ if (arg_fstab_enabled) {
+ int k;
+
+ log_debug("Parsing /etc/fstab");
+
+ /* Parse the local /etc/fstab, possibly from the initrd */
+ k = parse_fstab(false);
+ if (k < 0)
+ r = k;
+
+ /* If running in the initrd also parse the /etc/fstab from the host */
+ if (in_initrd()) {
+ log_debug("Parsing /sysroot/etc/fstab");
+
+ k = parse_fstab(true);
+ if (k < 0)
+ r = k;
+ }
+ }
+
+ free(arg_root_what);
+ free(arg_root_fstype);
+ free(arg_root_options);
+
+ free(arg_usr_what);
+ free(arg_usr_fstype);
+ free(arg_usr_options);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}