diff options
Diffstat (limited to 'src/fstab-generator/fstab-generator.c')
| -rw-r--r-- | src/fstab-generator/fstab-generator.c | 723 |
1 files changed, 0 insertions, 723 deletions
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c deleted file mode 100644 index e77bd71a52..0000000000 --- a/src/fstab-generator/fstab-generator.c +++ /dev/null @@ -1,723 +0,0 @@ -/*** - 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; -} |