diff options
Diffstat (limited to 'src/fstab-generator/fstab-generator.c')
| -rw-r--r-- | src/fstab-generator/fstab-generator.c | 560 |
1 files changed, 560 insertions, 0 deletions
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c new file mode 100644 index 0000000000..62053b7f35 --- /dev/null +++ b/src/fstab-generator/fstab-generator.c @@ -0,0 +1,560 @@ +/*-*- 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" + +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 *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL; + FILE *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) { + r = log_oom(); + goto finish; + } + + unit = strjoin(arg_dest, "/", name, NULL); + if (!unit) { + r = log_oom(); + goto finish; + } + + f = fopen(unit, "wxe"); + if (!f) { + r = -errno; + log_error("Failed to create unit file %s: %m", unit); + goto finish; + } + + 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); + r = -errno; + goto finish; + } + + if (!noauto) { + lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL); + if (!lnk) { + r = log_oom(); + goto finish; + } + + mkdir_parents_label(lnk, 0755); + if (symlink(unit, lnk) < 0) { + log_error("Failed to create symlink %s: %m", lnk); + r = -errno; + goto finish; + } + + r = device_name(what, &device); + if (r < 0) + goto finish; + + if (r > 0) { + free(lnk); + lnk = strjoin(arg_dest, "/", device, ".wants/", name, NULL); + if (!lnk) { + r = log_oom(); + goto finish; + } + + mkdir_parents_label(lnk, 0755); + if (symlink(unit, lnk) < 0) { + log_error("Failed to create symlink %s: %m", lnk); + r = -errno; + goto finish; + } + } + } + + r = 0; +finish: + if (f) + fclose(f); + + free(unit); + free(lnk); + free(name); + free(device); + + return r; +} + +static bool mount_is_bind(struct mntent *me) { + assert(me); + + return + hasmntopt(me, "bind") || + streq(me->mnt_opts, "bind"); +} + +static bool mount_is_network(struct mntent *me) { + assert(me); + + return + hasmntopt(me, "_netdev") || + fstype_is_network(me->mnt_type); +} + +static int add_mount(const char *what, const char *where, struct mntent *me) { + char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL, *automount_name = NULL, *automount_unit = NULL; + FILE *f = NULL; + bool noauto, nofail, automount, isbind, isnetwork; + int r; + const char *post, *pre; + + assert(what); + assert(where); + assert(me); + + if (streq(me->mnt_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; + + isnetwork = mount_is_network(me); + isbind = mount_is_bind(me); + + noauto = !!hasmntopt(me, "noauto"); + nofail = !!hasmntopt(me, "nofail"); + automount = + hasmntopt(me, "comment=systemd.automount") || + hasmntopt(me, "x-systemd.automount"); + + 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) { + r = log_oom(); + goto finish; + } + + unit = strjoin(arg_dest, "/", name, NULL); + if (!unit) { + r = log_oom(); + goto finish; + } + + f = fopen(unit, "wxe"); + if (!f) { + r = -errno; + log_error("Failed to create unit file %s: %m", unit); + goto finish; + } + + fputs("# Automatically generated by systemd-fstab-generator\n\n" + "[Unit]\n" + "SourcePath=/etc/fstab\n" + "DefaultDependencies=no\n", f); + + 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, + me->mnt_type, + me->mnt_passno); + + if (!isempty(me->mnt_opts) && + !streq(me->mnt_opts, "defaults")) + fprintf(f, + "Options=%s\n", + me->mnt_opts); + + fflush(f); + if (ferror(f)) { + log_error("Failed to write unit file %s: %m", unit); + r = -errno; + goto finish; + } + + if (!noauto) { + lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL); + if (!lnk) { + r = log_oom(); + goto finish; + } + + mkdir_parents_label(lnk, 0755); + if (symlink(unit, lnk) < 0) { + log_error("Failed to create symlink %s: %m", lnk); + r = -errno; + goto finish; + } + + if (!isbind && + !path_equal(where, "/")) { + + r = device_name(what, &device); + if (r < 0) + goto finish; + + if (r > 0) { + free(lnk); + lnk = strjoin(arg_dest, "/", device, ".wants/", name, NULL); + if (!lnk) { + r = log_oom(); + goto finish; + } + + mkdir_parents_label(lnk, 0755); + if (symlink(unit, lnk) < 0) { + log_error("Failed to create symlink %s: %m", lnk); + r = -errno; + goto finish; + } + } + } + } + + if (automount && !path_equal(where, "/")) { + automount_name = unit_name_from_path(where, ".automount"); + if (!name) { + r = log_oom(); + goto finish; + } + + automount_unit = strjoin(arg_dest, "/", automount_name, NULL); + if (!automount_unit) { + r = log_oom(); + goto finish; + } + + fclose(f); + f = fopen(automount_unit, "wxe"); + if (!f) { + r = -errno; + log_error("Failed to create unit file %s: %m", automount_unit); + goto finish; + } + + fprintf(f, + "# 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 " %s\n" + "\n" + "[Automount]\n" + "Where=%s\n", + post, + where); + + fflush(f); + if (ferror(f)) { + log_error("Failed to write unit file %s: %m", automount_unit); + r = -errno; + goto finish; + } + + free(lnk); + lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL); + if (!lnk) { + r = log_oom(); + goto finish; + } + + mkdir_parents_label(lnk, 0755); + if (symlink(automount_unit, lnk) < 0) { + log_error("Failed to create symlink %s: %m", lnk); + r = -errno; + goto finish; + } + } + + r = 0; +finish: + if (f) + fclose(f); + + free(unit); + free(lnk); + free(name); + free(device); + free(automount_name); + free(automount_unit); + + return r; +} + +static int parse_fstab(void) { + FILE *f; + int r = 0; + struct mntent *me; + + errno = 0; + f = setmntent("/etc/fstab", "r"); + if (!f) { + if (errno == ENOENT) + return 0; + + log_error("Failed to open /etc/fstab: %m"); + return -errno; + } + + while ((me = getmntent(f))) { + char *where, *what; + int k; + + what = fstab_node_to_udev_node(me->mnt_fsname); + if (!what) { + r = log_oom(); + goto finish; + } + + where = strdup(me->mnt_dir); + if (!where) { + r = log_oom(); + free(what); + 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 + k = add_mount(what, where, me); + + free(what); + free(where); + + if (k < 0) + r = k; + } + +finish: + endmntent(f); + return r; +} + +static int parse_proc_cmdline(void) { + char *line, *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 *word; + + word = strndup(w, l); + if (!word) { + r = log_oom(); + goto finish; + } + + 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); + } + + free(word); + } + + r = 0; + +finish: + free(line); + return r; +} + +int main(int argc, char *argv[]) { + int r; + + 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 (!arg_enabled) + return EXIT_SUCCESS; + + r = parse_fstab(); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |