| /* SPDX-License-Identifier: LGPL-2.1+ */ |
| |
| #include <errno.h> |
| #include <mntent.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <stdio_ext.h> |
| |
| #include "alloc-util.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "fs-util.h" |
| #include "fstab-util.h" |
| #include "generator.h" |
| #include "log.h" |
| #include "main-func.h" |
| #include "mkdir.h" |
| #include "mount-setup.h" |
| #include "mount-util.h" |
| #include "mountpoint-util.h" |
| #include "parse-util.h" |
| #include "path-util.h" |
| #include "proc-cmdline.h" |
| #include "special.h" |
| #include "specifier.h" |
| #include "stat-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "unit-name.h" |
| #include "util.h" |
| #include "virt.h" |
| #include "volatile-util.h" |
| |
| typedef enum MountpointFlags { |
| NOAUTO = 1 << 0, |
| NOFAIL = 1 << 1, |
| AUTOMOUNT = 1 << 2, |
| MAKEFS = 1 << 3, |
| GROWFS = 1 << 4, |
| } MountpointFlags; |
| |
| static const char *arg_dest = NULL; |
| static const char *arg_dest_late = NULL; |
| 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 char *arg_root_hash = 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 VolatileMode arg_volatile_mode = _VOLATILE_MODE_INVALID; |
| |
| STATIC_DESTRUCTOR_REGISTER(arg_root_what, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_root_fstype, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_root_options, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_usr_what, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_usr_fstype, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_usr_options, freep); |
| |
| static int write_options(FILE *f, const char *options) { |
| _cleanup_free_ char *o = NULL; |
| |
| if (isempty(options)) |
| return 0; |
| |
| if (streq(options, "defaults")) |
| return 0; |
| |
| o = specifier_escape(options); |
| if (!o) |
| return log_oom(); |
| |
| fprintf(f, "Options=%s\n", o); |
| return 1; |
| } |
| |
| static int write_what(FILE *f, const char *what) { |
| _cleanup_free_ char *w = NULL; |
| |
| w = specifier_escape(what); |
| if (!w) |
| return log_oom(); |
| |
| fprintf(f, "What=%s\n", w); |
| return 1; |
| } |
| |
| static int add_swap( |
| const char *what, |
| struct mntent *me, |
| MountpointFlags flags) { |
| |
| _cleanup_free_ char *name = 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"); |
| |
| r = generator_open_unit_file(arg_dest, "/etc/fstab", name, &f); |
| if (r < 0) |
| return r; |
| |
| fputs("[Unit]\n" |
| "SourcePath=/etc/fstab\n" |
| "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n" |
| "[Swap]\n", f); |
| |
| r = write_what(f, what); |
| if (r < 0) |
| return r; |
| |
| r = write_options(f, me->mnt_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", name); |
| |
| /* 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 (flags & MAKEFS) { |
| r = generator_hook_up_mkswap(arg_dest, what); |
| if (r < 0) |
| return r; |
| } |
| |
| if (flags & GROWFS) |
| /* TODO: swap devices must be wiped and recreated */ |
| log_warning("%s: growing swap devices is currently unsupported.", what); |
| |
| if (!(flags & NOAUTO)) { |
| r = generator_add_symlink(arg_dest, SPECIAL_SWAP_TARGET, |
| (flags & NOFAIL) ? "wants" : "requires", name); |
| if (r < 0) |
| return r; |
| } |
| |
| 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_timeout(FILE *f, const char *where, const char *opts, |
| const char *filter, const char *variable) { |
| _cleanup_free_ char *timeout = NULL; |
| char timespan[FORMAT_TIMESPAN_MAX]; |
| usec_t u; |
| int r; |
| |
| r = fstab_filter_options(opts, filter, NULL, &timeout, NULL); |
| if (r < 0) |
| return log_warning_errno(r, "Failed to parse options: %m"); |
| if (r == 0) |
| return 0; |
| |
| r = parse_sec_fix_0(timeout, &u); |
| if (r < 0) { |
| log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout); |
| return 0; |
| } |
| |
| fprintf(f, "%s=%s\n", variable, format_timespan(timespan, sizeof(timespan), u, 0)); |
| |
| return 0; |
| } |
| |
| static int write_idle_timeout(FILE *f, const char *where, const char *opts) { |
| return write_timeout(f, where, opts, |
| "x-systemd.idle-timeout\0", "TimeoutIdleSec"); |
| } |
| |
| static int write_mount_timeout(FILE *f, const char *where, const char *opts) { |
| return write_timeout(f, where, opts, |
| "x-systemd.mount-timeout\0", "TimeoutSec"); |
| } |
| |
| static int write_dependency(FILE *f, const char *opts, |
| const char *filter, const char *format) { |
| _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, filter, &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, 0, ".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(); |
| #pragma GCC diagnostic push |
| #pragma GCC diagnostic ignored "-Wformat-nonliteral" |
| fprintf(f, format, res); |
| #pragma GCC diagnostic pop |
| } |
| |
| return 0; |
| } |
| |
| static int write_after(FILE *f, const char *opts) { |
| return write_dependency(f, opts, "x-systemd.after", "After=%1$s\n"); |
| } |
| |
| static int write_requires_after(FILE *f, const char *opts) { |
| return write_dependency(f, opts, |
| "x-systemd.requires", "After=%1$s\nRequires=%1$s\n"); |
| } |
| |
| static int write_before(FILE *f, const char *opts) { |
| return write_dependency(f, opts, |
| "x-systemd.before", "Before=%1$s\n"); |
| } |
| |
| static int write_requires_mounts_for(FILE *f, const char *opts) { |
| _cleanup_strv_free_ char **paths = NULL, **paths_escaped = 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; |
| |
| r = specifier_escape_strv(paths, &paths_escaped); |
| if (r < 0) |
| return log_error_errno(r, "Failed to escape paths: %m"); |
| |
| res = strv_join(paths_escaped, " "); |
| if (!res) |
| return log_oom(); |
| |
| fprintf(f, "RequiresMountsFor=%s\n", res); |
| |
| return 0; |
| } |
| |
| static int add_mount( |
| const char *dest, |
| const char *what, |
| const char *where, |
| const char *original_where, |
| const char *fstype, |
| const char *opts, |
| int passno, |
| MountpointFlags flags, |
| const char *post, |
| const char *source) { |
| |
| _cleanup_free_ char |
| *name = NULL, |
| *automount_name = NULL, |
| *filtered = NULL, |
| *where_escaped = 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 (flags & NOAUTO) |
| log_warning("Ignoring \"noauto\" for root device"); |
| if (flags & NOFAIL) |
| log_warning("Ignoring \"nofail\" for root device"); |
| if (flags & AUTOMOUNT) |
| log_warning("Ignoring automount option for root device"); |
| |
| SET_FLAG(flags, 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"); |
| |
| r = generator_open_unit_file(dest, "/etc/fstab", name, &f); |
| if (r < 0) |
| return r; |
| |
| fprintf(f, |
| "[Unit]\n" |
| "SourcePath=%s\n" |
| "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n", |
| source); |
| |
| if (STRPTR_IN_SET(fstype, "nfs", "nfs4") && !(flags & AUTOMOUNT) && |
| fstab_test_yes_no_option(opts, "bg\0" "fg\0")) { |
| /* The default retry timeout that mount.nfs uses for 'bg' mounts |
| * is 10000 minutes, where as it uses 2 minutes for 'fg' mounts. |
| * As we are making 'bg' mounts look like an 'fg' mount to |
| * mount.nfs (so systemd can manage the job-control aspects of 'bg'), |
| * we need to explicitly preserve that default, and also ensure |
| * the systemd mount-timeout doesn't interfere. |
| * By placing these options first, they can be over-ridden by |
| * settings in /etc/fstab. */ |
| opts = strjoina("x-systemd.mount-timeout=infinity,retry=10000,", opts, ",fg"); |
| SET_FLAG(flags, NOFAIL, true); |
| } |
| |
| if (!(flags & NOFAIL) && !(flags & AUTOMOUNT)) |
| fprintf(f, "Before=%s\n", post); |
| |
| if (!(flags & AUTOMOUNT) && opts) { |
| r = write_after(f, opts); |
| if (r < 0) |
| return r; |
| r = write_requires_after(f, opts); |
| if (r < 0) |
| return r; |
| r = write_before(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, dest, what, where, fstype); |
| if (r < 0) |
| return r; |
| } |
| |
| fprintf(f, "\n[Mount]\n"); |
| if (original_where) |
| fprintf(f, "# Canonicalized from %s\n", original_where); |
| |
| where_escaped = specifier_escape(where); |
| if (!where_escaped) |
| return log_oom(); |
| fprintf(f, "Where=%s\n", where_escaped); |
| |
| r = write_what(f, what); |
| if (r < 0) |
| return r; |
| |
| if (!isempty(fstype) && !streq(fstype, "auto")) { |
| _cleanup_free_ char *t; |
| |
| t = specifier_escape(fstype); |
| if (!t) |
| return -ENOMEM; |
| |
| fprintf(f, "Type=%s\n", t); |
| } |
| |
| r = generator_write_timeouts(dest, what, where, opts, &filtered); |
| if (r < 0) |
| return r; |
| |
| r = generator_write_device_deps(dest, what, where, opts); |
| if (r < 0) |
| return r; |
| |
| r = write_mount_timeout(f, where, opts); |
| if (r < 0) |
| return r; |
| |
| r = write_options(f, filtered); |
| 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", name); |
| |
| if (flags & MAKEFS) { |
| r = generator_hook_up_mkfs(dest, what, where, fstype); |
| if (r < 0) |
| return r; |
| } |
| |
| if (flags & GROWFS) { |
| r = generator_hook_up_growfs(dest, where, post); |
| if (r < 0) |
| return r; |
| } |
| |
| if (!(flags & NOAUTO) && !(flags & AUTOMOUNT)) { |
| r = generator_add_symlink(dest, post, |
| (flags & NOFAIL) ? "wants" : "requires", name); |
| if (r < 0) |
| return r; |
| } |
| |
| if (flags & AUTOMOUNT) { |
| r = unit_name_from_path(where, ".automount", &automount_name); |
| if (r < 0) |
| return log_error_errno(r, "Failed to generate unit name: %m"); |
| |
| fclose(f); |
| |
| r = generator_open_unit_file(dest, "/etc/fstab", automount_name, &f); |
| if (r < 0) |
| return r; |
| |
| fprintf(f, |
| "[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_after(f, opts); |
| if (r < 0) |
| return r; |
| r = write_requires_after(f, opts); |
| if (r < 0) |
| return r; |
| r = write_before(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_escaped); |
| |
| 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_name); |
| |
| r = generator_add_symlink(dest, post, |
| (flags & NOFAIL) ? "wants" : "requires", automount_name); |
| if (r < 0) |
| return r; |
| } |
| |
| 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"; |
| log_debug("Parsing %s...", fstab_path); |
| |
| 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, *canonical_where = NULL; |
| bool makefs, growfs, 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 = strdup(me->mnt_dir); |
| if (!where) |
| return log_oom(); |
| |
| if (is_path(where)) { |
| path_simplify(where, false); |
| |
| /* Follow symlinks here; see 5261ba901845c084de5a8fd06500ed09bfb0bd80 which makes sense for |
| * mount units, but causes problems since it historically worked to have symlinks in e.g. |
| * /etc/fstab. So we canonicalize here. Note that we use CHASE_NONEXISTENT to handle the case |
| * where a symlink refers to another mount target; this works assuming the sub-mountpoint |
| * target is the final directory. */ |
| r = chase_symlinks(where, initrd ? "/sysroot" : NULL, |
| CHASE_PREFIX_ROOT | CHASE_NONEXISTENT, |
| &canonical_where); |
| if (r < 0) /* If we can't canonicalize we continue on as if it wasn't a symlink */ |
| log_debug_errno(r, "Failed to read symlink target for %s, ignoring: %m", where); |
| else if (streq(canonical_where, where)) /* If it was fully canonicalized, suppress the change */ |
| canonical_where = mfree(canonical_where); |
| else |
| log_debug("Canonicalized what=%s where=%s to %s", what, where, canonical_where); |
| } |
| |
| makefs = fstab_test_option(me->mnt_opts, "x-systemd.makefs\0"); |
| growfs = fstab_test_option(me->mnt_opts, "x-systemd.growfs\0"); |
| 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 makefs=%s growfs=%s noauto=%s nofail=%s", |
| what, where, me->mnt_type, |
| yes_no(makefs), yes_no(growfs), |
| yes_no(noauto), yes_no(nofail)); |
| |
| if (streq(me->mnt_type, "swap")) |
| k = add_swap(what, me, |
| makefs*MAKEFS | growfs*GROWFS | noauto*NOAUTO | nofail*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(arg_dest, |
| what, |
| canonical_where ?: where, |
| canonical_where ? where: NULL, |
| me->mnt_type, |
| me->mnt_opts, |
| me->mnt_passno, |
| makefs*MAKEFS | growfs*GROWFS | noauto*NOAUTO | nofail*NOFAIL | automount*AUTOMOUNT, |
| post, |
| fstab_path); |
| } |
| |
| if (r >= 0 && 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(arg_dest, |
| what, |
| "/sysroot", |
| NULL, |
| arg_root_fstype, |
| opts, |
| is_device_path(what) ? 1 : 0, /* passno */ |
| 0, /* makefs off, growfs off, noauto off, nofail off, 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(arg_dest, |
| what, |
| "/sysroot/usr", |
| NULL, |
| arg_usr_fstype, |
| opts, |
| is_device_path(what) ? 1 : 0, /* passno */ |
| 0, |
| SPECIAL_INITRD_FS_TARGET, |
| "/proc/cmdline"); |
| } |
| |
| static int add_volatile_root(void) { |
| |
| /* Let's add in systemd-remount-volatile.service which will remount the root device to tmpfs if this is |
| * requested (or as an overlayfs), leaving only /usr from the root mount inside. */ |
| |
| if (!IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_OVERLAY)) |
| return 0; |
| |
| return generator_add_symlink(arg_dest, SPECIAL_INITRD_ROOT_FS_TARGET, "requires", |
| SYSTEM_DATA_UNIT_PATH "/" SPECIAL_VOLATILE_ROOT_SERVICE); |
| } |
| |
| static int add_volatile_var(void) { |
| |
| if (arg_volatile_mode != VOLATILE_STATE) |
| return 0; |
| |
| /* If requested, mount /var as tmpfs, but do so only if there's nothing else defined for this. */ |
| |
| return add_mount(arg_dest_late, |
| "tmpfs", |
| "/var", |
| NULL, |
| "tmpfs", |
| "mode=0755", |
| 0, |
| 0, |
| SPECIAL_LOCAL_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")) { |
| |
| r = value ? parse_boolean(value) : 1; |
| if (r < 0) |
| log_warning("Failed to parse fstab switch %s. Ignoring.", value); |
| else |
| arg_fstab_enabled = r; |
| |
| } else if (streq(key, "root")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| if (free_and_strdup(&arg_root_what, value) < 0) |
| return log_oom(); |
| |
| } else if (streq(key, "rootfstype")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| if (free_and_strdup(&arg_root_fstype, value) < 0) |
| return log_oom(); |
| |
| } else if (streq(key, "rootflags")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| if (!strextend_with_separator(&arg_root_options, ",", value, NULL)) |
| return log_oom(); |
| |
| } else if (streq(key, "roothash")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| if (free_and_strdup(&arg_root_hash, value) < 0) |
| return log_oom(); |
| |
| } else if (streq(key, "mount.usr")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| if (free_and_strdup(&arg_usr_what, value) < 0) |
| return log_oom(); |
| |
| } else if (streq(key, "mount.usrfstype")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| if (free_and_strdup(&arg_usr_fstype, value) < 0) |
| return log_oom(); |
| |
| } else if (streq(key, "mount.usrflags")) { |
| |
| if (proc_cmdline_value_missing(key, value)) |
| return 0; |
| |
| if (!strextend_with_separator(&arg_usr_options, ",", value, NULL)) |
| return log_oom(); |
| |
| } else if (streq(key, "rw") && !value) |
| arg_root_rw = true; |
| else if (streq(key, "ro") && !value) |
| arg_root_rw = false; |
| else if (streq(key, "systemd.volatile")) { |
| VolatileMode m; |
| |
| if (value) { |
| m = volatile_mode_from_string(value); |
| if (m < 0) |
| log_warning("Failed to parse systemd.volatile= argument: %s", value); |
| else |
| arg_volatile_mode = m; |
| } else |
| arg_volatile_mode = VOLATILE_YES; |
| } |
| |
| return 0; |
| } |
| |
| static int determine_root(void) { |
| /* If we have a root hash but no root device then Verity is used, and we use the "root" DM device as root. */ |
| |
| if (arg_root_what) |
| return 0; |
| |
| if (!arg_root_hash) |
| return 0; |
| |
| arg_root_what = strdup("/dev/mapper/root"); |
| if (!arg_root_what) |
| return log_oom(); |
| |
| log_info("Using verity root device %s.", arg_root_what); |
| |
| return 1; |
| } |
| |
| static int run(const char *dest, const char *dest_early, const char *dest_late) { |
| int r, r2 = 0, r3 = 0; |
| |
| assert_se(arg_dest = dest); |
| assert_se(arg_dest_late = dest_late); |
| |
| r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0); |
| if (r < 0) |
| log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); |
| |
| (void) determine_root(); |
| |
| /* Always honour root= and usr= in the kernel command line if we are in an initrd */ |
| if (in_initrd()) { |
| r = add_sysroot_mount(); |
| |
| r2 = add_sysroot_usr_mount(); |
| |
| r3 = add_volatile_root(); |
| } else |
| r = add_volatile_var(); |
| |
| /* Honour /etc/fstab only when that's enabled */ |
| if (arg_fstab_enabled) { |
| /* Parse the local /etc/fstab, possibly from the initrd */ |
| r2 = parse_fstab(false); |
| |
| /* If running in the initrd also parse the /etc/fstab from the host */ |
| if (in_initrd()) |
| r3 = parse_fstab(true); |
| else |
| r3 = generator_enable_remount_fs_service(arg_dest); |
| } |
| |
| return r < 0 ? r : r2 < 0 ? r2 : r3; |
| } |
| |
| DEFINE_MAIN_GENERATOR_FUNCTION(run); |