| /*** |
| 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) |
| return log_error_errno(errno, |
| errno == EEXIST ? |
| "Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?" : |
| "Failed to create unit file %s: %m", |
| unit); |
| |
| 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) |
| return log_error_errno(errno, |
| errno == EEXIST ? |
| "Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?" : |
| "Failed to create unit file %s: %m", |
| 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); |
| |
| 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; |
| |
| return log_error_errno(errno, "Failed to open %s: %m", fstab_path); |
| } |
| |
| 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; |
| } |
| |
| if (streq(arg_root_what, "gpt-auto")) { |
| /* This is handled by the gpt-auto generator */ |
| log_debug("Skipping root directory handling, as gpt-auto was requested."); |
| return 0; |
| } |
| |
| if (path_equal(arg_root_what, "/dev/nfs")) { |
| /* This is handled by the kernel or the initrd */ |
| log_debug("Skipping root directory handling, as /dev/nfs was requested."); |
| 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, /* passno */ |
| false, /* noauto off */ |
| false, /* nofail off */ |
| false, /* automount off */ |
| 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) { |
| /* Copy over the root device, in case the /usr mount just differs in a mount option (consider btrfs subvolumes) */ |
| 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 (!what) |
| return log_oom(); |
| |
| 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, |
| is_device_path(what) ? 1 : 0, /* passno */ |
| false, /* noauto off */ |
| false, /* nofail off */ |
| false, /* automount off */ |
| SPECIAL_INITRD_FS_TARGET, |
| "/proc/cmdline"); |
| } |
| |
| static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
| 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, NULL, false); |
| 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()) { |
| int k; |
| |
| r = add_sysroot_mount(); |
| |
| k = add_sysroot_usr_mount(); |
| if (k < 0) |
| r = k; |
| } else |
| r = 0; |
| |
| /* 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; |
| } |