| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| 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 <stdio.h> |
| #include <mntent.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include "log.h" |
| #include "util.h" |
| #include "unit-name.h" |
| #include "path-util.h" |
| #include "mount-setup.h" |
| #include "special.h" |
| #include "mkdir.h" |
| #include "fileio.h" |
| #include "generator.h" |
| #include "strv.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 int mount_find_pri(struct mntent *me, int *ret) { |
| char *end, *pri; |
| unsigned long r; |
| |
| assert(me); |
| assert(ret); |
| |
| pri = hasmntopt(me, "pri"); |
| if (!pri) |
| return 0; |
| |
| pri += 4; |
| |
| errno = 0; |
| r = strtoul(pri, &end, 10); |
| if (errno > 0) |
| return -errno; |
| |
| if (end == pri || (*end != ',' && *end != 0)) |
| return -EINVAL; |
| |
| *ret = (int) r; |
| return 1; |
| } |
| |
| static int add_swap(const char *what, struct mntent *me) { |
| _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| bool noauto; |
| int r, pri = -1; |
| |
| assert(what); |
| assert(me); |
| |
| if (detect_container(NULL) > 0) { |
| log_info("Running in a container, ignoring fstab swap entry for %s.", what); |
| return 0; |
| } |
| |
| r = mount_find_pri(me, &pri); |
| if (r < 0) { |
| log_error("Failed to parse priority"); |
| return pri; |
| } |
| |
| noauto = !!hasmntopt(me, "noauto"); |
| |
| name = unit_name_from_path(what, ".swap"); |
| if (!name) |
| return log_oom(); |
| |
| 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("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 (pri >= 0) |
| fprintf(f, |
| "Priority=%i\n", |
| pri); |
| |
| fflush(f); |
| if (ferror(f)) { |
| log_error("Failed to write unit file %s: %m", unit); |
| return -errno; |
| } |
| |
| if (!noauto) { |
| lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL); |
| if (!lnk) |
| return log_oom(); |
| |
| mkdir_parents_label(lnk, 0755); |
| if (symlink(unit, lnk) < 0) { |
| log_error("Failed to create symlink %s: %m", lnk); |
| return -errno; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static bool mount_is_network(struct mntent *me) { |
| assert(me); |
| |
| return |
| hasmntopt(me, "_netdev") || |
| fstype_is_network(me->mnt_type); |
| } |
| |
| static bool mount_in_initrd(struct mntent *me) { |
| assert(me); |
| |
| return |
| hasmntopt(me, "x-initrd.mount") || |
| streq(me->mnt_dir, "/usr"); |
| } |
| |
| 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; |
| _cleanup_fclose_ FILE *f = NULL; |
| int r; |
| |
| assert(what); |
| assert(where); |
| assert(opts); |
| 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, "/")) { |
| /* The root disk is not an option */ |
| automount = false; |
| noauto = false; |
| nofail = false; |
| } |
| |
| name = unit_name_from_path(where, ".mount"); |
| if (!name) |
| return log_oom(); |
| |
| 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("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 (post && !noauto && !nofail && !automount) |
| fprintf(f, "Before=%s\n", post); |
| |
| 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); |
| |
| if (!isempty(opts) && !streq(opts, "defaults")) |
| fprintf(f, "Options=%s\n", opts); |
| |
| fflush(f); |
| if (ferror(f)) { |
| log_error("Failed to write unit file %s: %m", unit); |
| return -errno; |
| } |
| |
| if (!noauto && post) { |
| lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL); |
| if (!lnk) |
| return log_oom(); |
| |
| mkdir_parents_label(lnk, 0755); |
| if (symlink(unit, lnk) < 0) { |
| log_error("Failed to create symlink %s: %m", lnk); |
| return -errno; |
| } |
| } |
| |
| if (automount) { |
| automount_name = unit_name_from_path(where, ".automount"); |
| if (!automount_name) |
| return log_oom(); |
| |
| automount_unit = strjoin(arg_dest, "/", automount_name, NULL); |
| if (!automount_unit) |
| return log_oom(); |
| |
| fclose(f); |
| f = fopen(automount_unit, "wxe"); |
| if (!f) { |
| log_error("Failed to create unit file %s: %m", automount_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 (post) |
| fprintf(f, |
| "Before=%s\n", |
| post); |
| |
| fprintf(f, |
| "[Automount]\n" |
| "Where=%s\n", |
| where); |
| |
| fflush(f); |
| if (ferror(f)) { |
| log_error("Failed to write unit file %s: %m", automount_unit); |
| return -errno; |
| } |
| |
| 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) { |
| log_error("Failed to create symlink %s: %m", lnk); |
| return -errno; |
| } |
| } |
| |
| 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("Failed to open %s: %m", fstab_path); |
| return -errno; |
| } |
| |
| while ((me = getmntent(f))) { |
| _cleanup_free_ char *where = NULL, *what = NULL; |
| int k; |
| |
| if (initrd && !mount_in_initrd(me)) |
| continue; |
| |
| what = fstab_node_to_udev_node(me->mnt_fsname); |
| if (!what) |
| return log_oom(); |
| |
| if (detect_container(NULL) > 0 && is_device_path(what)) { |
| 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); |
| |
| log_debug("Found entry what=%s where=%s type=%s", what, where, me->mnt_type); |
| |
| if (streq(me->mnt_type, "swap")) |
| k = add_swap(what, me); |
| else { |
| bool noauto, nofail, automount; |
| const char *post; |
| |
| noauto = !!hasmntopt(me, "noauto"); |
| nofail = !!hasmntopt(me, "nofail"); |
| automount = |
| hasmntopt(me, "comment=systemd.automount") || |
| hasmntopt(me, "x-systemd.automount"); |
| |
| if (initrd) |
| post = SPECIAL_INITRD_FS_TARGET; |
| else if (mount_in_initrd(me)) |
| post = SPECIAL_INITRD_ROOT_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_root_mount(void) { |
| _cleanup_free_ char *o = NULL, *what = NULL; |
| |
| if (isempty(arg_root_what)) { |
| log_debug("Could not find a root= entry on the kernel commandline."); |
| return 0; |
| } |
| |
| what = fstab_node_to_udev_node(arg_root_what); |
| if (!path_is_absolute(what)) { |
| log_debug("Skipping entry what=%s where=/sysroot type=%s", what, strna(arg_root_fstype)); |
| return 0; |
| } |
| |
| if (!arg_root_options) |
| o = strdup(arg_root_rw > 0 ? "rw" : "ro"); |
| else { |
| if (arg_root_rw >= 0 || |
| (!mount_test_option(arg_root_options, "ro") && |
| !mount_test_option(arg_root_options, "rw"))) |
| o = strjoin(arg_root_options, ",", arg_root_rw > 0 ? "rw" : "ro", NULL); |
| else |
| o = strdup(arg_root_options); |
| } |
| if (!o) |
| return log_oom(); |
| |
| log_debug("Found entry what=%s where=/sysroot type=%s", what, strna(arg_root_fstype)); |
| return add_mount(what, |
| "/sysroot", |
| arg_root_fstype, |
| o, |
| 1, |
| false, |
| false, |
| false, |
| SPECIAL_INITRD_ROOT_FS_TARGET, |
| "/proc/cmdline"); |
| } |
| |
| static int parse_proc_cmdline_item(const char *key, const char *value) { |
| int r; |
| |
| /* root= and roofstype= may occur more than once, the last |
| * instance should take precedence. In the case of multiple |
| * rootflags= 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) { |
| |
| free(arg_root_what); |
| arg_root_what = strdup(value); |
| if (!arg_root_what) |
| return log_oom(); |
| |
| } else if (streq(key, "rootfstype") && value) { |
| |
| free(arg_root_fstype); |
| arg_root_fstype = strdup(value); |
| if (!arg_root_fstype) |
| 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, "rw") && !value) |
| arg_root_rw = true; |
| else if (streq(key, "ro") && !value) |
| arg_root_rw = false; |
| else if (startswith(key, "fstab.") || startswith(key, "rd.fstab.")) |
| log_warning("Unknown kernel switch %s. Ignoring.", key); |
| |
| 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); |
| |
| if (parse_proc_cmdline(parse_proc_cmdline_item) < 0) |
| return EXIT_FAILURE; |
| |
| /* Always honour root= in the kernel command line if we are in an initrd */ |
| if (in_initrd()) |
| r = add_root_mount(); |
| |
| /* Honour /etc/fstab only when that's enabled */ |
| if (arg_fstab_enabled) { |
| int k; |
| |
| /* 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()) { |
| k = parse_fstab(true); |
| if (k < 0) |
| r = k; |
| } |
| } |
| |
| return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
| } |