| /*-*- 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 "virt.h" |
| #include "fileio.h" |
| |
| static const char *arg_dest = "/tmp"; |
| static bool arg_enabled = true; |
| |
| static int device_name(const char *path, char **unit) { |
| char *p; |
| |
| assert(path); |
| |
| if (!is_device_path(path)) |
| return 0; |
| |
| p = unit_name_from_path(path, ".device"); |
| if (!p) |
| return log_oom(); |
| |
| *unit = p; |
| return 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) { |
| char _cleanup_free_ *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL; |
| FILE _cleanup_fclose_ *f = NULL; |
| bool noauto, nofail; |
| int r, pri = -1; |
| |
| assert(what); |
| assert(me); |
| |
| r = mount_find_pri(me, &pri); |
| if (r < 0) { |
| log_error("Failed to parse priority"); |
| return pri; |
| } |
| |
| noauto = !!hasmntopt(me, "noauto"); |
| nofail = !!hasmntopt(me, "nofail"); |
| |
| 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; |
| } |
| |
| fputs("# Automatically generated by systemd-fstab-generator\n\n" |
| "[Unit]\n" |
| "SourcePath=/etc/fstab\n" |
| "DefaultDependencies=no\n" |
| "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" |
| "Before=" SPECIAL_UMOUNT_TARGET "\n", f); |
| |
| if (!noauto && !nofail) |
| fputs("Before=" SPECIAL_SWAP_TARGET "\n", f); |
| |
| fprintf(f, |
| "\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; |
| } |
| |
| r = device_name(what, &device); |
| if (r < 0) |
| return r; |
| |
| if (r > 0) { |
| free(lnk); |
| lnk = strjoin(arg_dest, "/", device, ".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_bind(struct mntent *me) { |
| assert(me); |
| |
| return |
| hasmntopt(me, "bind") || |
| streq(me->mnt_type, "bind") || |
| hasmntopt(me, "rbind") || |
| streq(me->mnt_type, "rbind"); |
| } |
| |
| 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 *type, const char *opts, |
| int passno, bool noauto, bool nofail, bool automount, bool isbind, bool isnetwork, |
| const char *source) { |
| char _cleanup_free_ |
| *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL, |
| *automount_name = NULL, *automount_unit = NULL; |
| FILE _cleanup_fclose_ *f = NULL; |
| int r; |
| const char *post, *pre; |
| |
| assert(what); |
| assert(where); |
| assert(type); |
| assert(opts); |
| assert(source); |
| |
| if (streq(type, "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 (isnetwork) { |
| post = SPECIAL_REMOTE_FS_TARGET; |
| pre = SPECIAL_REMOTE_FS_PRE_TARGET; |
| } else { |
| post = SPECIAL_LOCAL_FS_TARGET; |
| pre = SPECIAL_LOCAL_FS_PRE_TARGET; |
| } |
| |
| 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" |
| "DefaultDependencies=no\n", |
| source); |
| |
| if (!path_equal(where, "/")) |
| fprintf(f, |
| "After=%s\n" |
| "Wants=%s\n" |
| "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" |
| "Before=" SPECIAL_UMOUNT_TARGET "\n", |
| pre, |
| pre); |
| |
| |
| if (!noauto && !nofail && !automount) |
| fprintf(f, |
| "Before=%s\n", |
| post); |
| |
| fprintf(f, |
| "\n" |
| "[Mount]\n" |
| "What=%s\n" |
| "Where=%s\n" |
| "Type=%s\n" |
| "FsckPassNo=%i\n", |
| what, |
| where, |
| type, |
| passno); |
| |
| 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) { |
| 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 (!isbind && |
| !path_equal(where, "/")) { |
| |
| r = device_name(what, &device); |
| if (r < 0) |
| return r; |
| |
| if (r > 0) { |
| free(lnk); |
| lnk = strjoin(arg_dest, "/", device, ".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; |
| } |
| } |
| } |
| } |
| |
| if (automount && !path_equal(where, "/")) { |
| automount_name = unit_name_from_path(where, ".automount"); |
| if (!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" |
| "DefaultDependencies=no\n" |
| "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" |
| "Before=" SPECIAL_UMOUNT_TARGET " %s\n" |
| "\n" |
| "[Automount]\n" |
| "Where=%s\n", |
| source, |
| post, |
| 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(const char *prefix, bool initrd) { |
| FILE *f; |
| _cleanup_free_ char *fstab_path = NULL; |
| int r = 0; |
| struct mntent *me; |
| |
| errno = 0; |
| fstab_path = strjoin(prefix, "/etc/fstab", NULL); |
| f = setmntent(fstab_path, "r"); |
| if (!f) { |
| if (errno == ENOENT) |
| return 0; |
| |
| log_error("Failed to open %s/etc/fstab: %m", prefix); |
| return -errno; |
| } |
| |
| while ((me = getmntent(f))) { |
| char _cleanup_free_ *where = NULL, *what = NULL; |
| int k; |
| |
| if (initrd && !mount_in_initrd(me)) |
| continue; |
| |
| what = fstab_node_to_udev_node(me->mnt_fsname); |
| where = strjoin(prefix, me->mnt_dir, NULL); |
| if (!what || !where) { |
| r = log_oom(); |
| goto finish; |
| } |
| |
| 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, isbind, isnetwork; |
| |
| noauto = !!hasmntopt(me, "noauto"); |
| nofail = !!hasmntopt(me, "nofail"); |
| automount = |
| hasmntopt(me, "comment=systemd.automount") || |
| hasmntopt(me, "x-systemd.automount"); |
| isbind = mount_is_bind(me); |
| isnetwork = mount_is_network(me); |
| |
| k = add_mount(what, where, me->mnt_type, me->mnt_opts, |
| me->mnt_passno, noauto, nofail, automount, |
| isbind, isnetwork, fstab_path); |
| } |
| |
| if (k < 0) |
| r = k; |
| } |
| |
| finish: |
| endmntent(f); |
| return r; |
| } |
| |
| static int parse_new_root_from_proc_cmdline(void) { |
| char *w, *state; |
| _cleanup_free_ char *what = NULL, *type = NULL, *opts = NULL, *line = NULL; |
| int r; |
| size_t l; |
| |
| r = read_one_line_file("/proc/cmdline", &line); |
| if (r < 0) { |
| log_error("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); |
| return 0; |
| } |
| |
| opts = strdup("ro"); |
| type = strdup("auto"); |
| if (!opts || !type) |
| return log_oom(); |
| |
| /* 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 */ |
| FOREACH_WORD_QUOTED(w, l, line, state) { |
| char *word, *tmp_word; |
| |
| word = strndup(w, l); |
| if (!word) |
| return log_oom(); |
| |
| else if (startswith(word, "root=")) { |
| free(what); |
| what = fstab_node_to_udev_node(word+5); |
| if (!what) |
| return log_oom(); |
| |
| } else if (startswith(word, "rootfstype=")) { |
| free(type); |
| type = strdup(word + 11); |
| if (!type) |
| return log_oom(); |
| |
| } else if (startswith(word, "rootflags=")) { |
| tmp_word = opts; |
| opts = strjoin(opts, ",", word + 10, NULL); |
| free(tmp_word); |
| if (!opts) |
| return log_oom(); |
| |
| } else if (streq(word, "ro") || streq(word, "rw")) { |
| tmp_word = opts; |
| opts = strjoin(opts, ",", word, NULL); |
| free(tmp_word); |
| if (!opts) |
| return log_oom(); |
| |
| } |
| |
| free(word); |
| } |
| |
| if (!what) { |
| log_error("Could not find a root= entry on the kernel commandline."); |
| return 0; |
| } |
| |
| if (what[0] != '/') { |
| log_debug("Skipping entry what=%s where=/sysroot type=%s", what, type); |
| return 0; |
| } |
| |
| log_debug("Found entry what=%s where=/sysroot type=%s", what, type); |
| r = add_mount(what, "/sysroot", type, opts, 0, false, false, false, |
| false, false, "/proc/cmdline"); |
| |
| return (r < 0) ? r : 0; |
| } |
| |
| static int parse_proc_cmdline(void) { |
| char _cleanup_free_ *line = NULL; |
| char *w, *state; |
| int r; |
| size_t l; |
| |
| if (detect_container(NULL) > 0) |
| return 0; |
| |
| r = read_one_line_file("/proc/cmdline", &line); |
| if (r < 0) { |
| log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); |
| return 0; |
| } |
| |
| FOREACH_WORD_QUOTED(w, l, line, state) { |
| char _cleanup_free_ *word = NULL; |
| |
| word = strndup(w, l); |
| if (!word) |
| return log_oom(); |
| |
| if (startswith(word, "fstab=")) { |
| r = parse_boolean(word + 6); |
| if (r < 0) |
| log_warning("Failed to parse fstab switch %s. Ignoring.", word + 6); |
| else |
| arg_enabled = r; |
| |
| } else if (startswith(word, "rd.fstab=")) { |
| |
| if (in_initrd()) { |
| r = parse_boolean(word + 6); |
| if (r < 0) |
| log_warning("Failed to parse fstab switch %s. Ignoring.", word + 6); |
| else |
| arg_enabled = r; |
| } |
| |
| } else if (startswith(word, "fstab.") || |
| (in_initrd() && startswith(word, "rd.fstab."))) { |
| |
| log_warning("Unknown kernel switch %s. Ignoring.", word); |
| } |
| } |
| |
| return 0; |
| } |
| |
| int main(int argc, char *argv[]) { |
| int r = 0, k, l = 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() < 0) |
| return EXIT_FAILURE; |
| |
| if (in_initrd()) |
| r = parse_new_root_from_proc_cmdline(); |
| |
| if (!arg_enabled) |
| return (r < 0) ? EXIT_FAILURE : EXIT_SUCCESS; |
| |
| k = parse_fstab("", false); |
| |
| if (in_initrd()) |
| l = parse_fstab("/sysroot", true); |
| |
| return (r < 0) || (k < 0) || (l < 0) ? EXIT_FAILURE : EXIT_SUCCESS; |
| } |