/*-*- 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" static const char *arg_dest = "/tmp"; static bool arg_enabled = true; 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); 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\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_fsck(FILE *f, const char *what, const char *where, const char *type, int passno) { assert(f); if (passno == 0) return 0; if (type && !streq(type, "auto")) { int r; const char *checker; checker = strappenda("/sbin/fsck.", type); r = access(checker, X_OK); if (r < 0) { log_warning("Checking was requested for %s, but %s cannot be used: %m", what, checker); /* treat missing check as essentially OK */ return errno == ENOENT ? 0 : -errno; } } if (streq(where, "/")) { char *lnk; lnk = strappenda(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service"); mkdir_parents_label(lnk, 0755); if (symlink("systemd-fsck-root.service", lnk) < 0) { log_error("Failed to create symlink %s: %m", lnk); return -errno; } } else { _cleanup_free_ char *fsck = NULL; fsck = unit_name_from_path_instance("systemd-fsck", what, ".service"); if (!fsck) return log_oom(); fprintf(f, "RequiresOverridable=%s\n" "After=%s\n", fsck, fsck); } return 0; } static int add_mount( const char *what, const char *where, const char *type, 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(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; 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", source); if (post && !noauto && !nofail && !automount) fprintf(f, "Before=%s\n", post); r = add_fsck(f, what, where, type, passno); if (r < 0) return r; fprintf(f, "\n" "[Mount]\n" "What=%s\n" "Where=%s\n" "Type=%s\n", what, where, type); 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) { if (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 && !path_equal(where, "/")) { 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", 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(const char *prefix, bool initrd) { char *fstab_path; _cleanup_endmntent_ FILE *f; int r = 0; struct mntent *me; fstab_path = strappenda(strempty(prefix), "/etc/fstab"); f = setmntent(fstab_path, "r"); if (!f) { if (errno == ENOENT) return 0; log_error("Failed to open %s/etc/fstab: %m", strempty(prefix)); 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); where = strjoin(strempty(prefix), me->mnt_dir, NULL); if (!what || !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 parse_new_root_from_proc_cmdline(void) { _cleanup_free_ char *what = NULL, *type = NULL, *opts = NULL, *line = NULL; bool noauto, nofail; char *w, *state; size_t l; int r; r = proc_cmdline(&line); if (r < 0) log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); if (r <= 0) 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) { _cleanup_free_ char *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=")) { char *o; o = strjoin(opts, ",", word + 10, NULL); if (!o) return log_oom(); free(opts); opts = o; } else if (streq(word, "ro") || streq(word, "rw")) { char *o; o = strjoin(opts, ",", word, NULL); if (!o) return log_oom(); free(opts); opts = o; } } noauto = !!strstr(opts, "noauto"); nofail = !!strstr(opts, "nofail"); if (!what) { log_debug("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, 1, noauto, nofail, false, SPECIAL_INITRD_ROOT_FS_TARGET, "/proc/cmdline"); return (r < 0) ? r : 0; } static int parse_proc_cmdline(void) { _cleanup_free_ char *line = NULL; char *w, *state; size_t l; int r; r = proc_cmdline(&line); if (r < 0) log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r)); if (r <= 0) return 0; FOREACH_WORD_QUOTED(w, l, line, state) { _cleanup_free_ char *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 + 9); if (r < 0) log_warning("Failed to parse fstab switch %s. Ignoring.", word + 9); 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(NULL, false); if (in_initrd()) l = parse_fstab("/sysroot", true); return (r < 0) || (k < 0) || (l < 0) ? EXIT_FAILURE : EXIT_SUCCESS; }