diff options
Diffstat (limited to 'src/fstab-generator/fstab-generator.c')
| -rw-r--r-- | src/fstab-generator/fstab-generator.c | 1646 |
1 files changed, 1646 insertions, 0 deletions
diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c new file mode 100644 index 0000000..016f3ba --- /dev/null +++ b/src/fstab-generator/fstab-generator.c @@ -0,0 +1,1646 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <errno.h> +#include <stdio.h> +#include <unistd.h> + +#include "alloc-util.h" +#include "bus-error.h" +#include "bus-locator.h" +#include "bus-unit-util.h" +#include "chase.h" +#include "creds-util.h" +#include "efi-loader.h" +#include "env-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "fstab-util.h" +#include "generator.h" +#include "in-addr-util.h" +#include "initrd-util.h" +#include "log.h" +#include "main-func.h" +#include "mkdir.h" +#include "mount-setup.h" +#include "mount-util.h" +#include "mountpoint-util.h" +#include "nulstr-util.h" +#include "parse-util.h" +#include "path-util.h" +#include "proc-cmdline.h" +#include "process-util.h" +#include "special.h" +#include "specifier.h" +#include "stat-util.h" +#include "string-util.h" +#include "strv.h" +#include "unit-name.h" +#include "virt.h" +#include "volatile-util.h" + +typedef enum MountPointFlags { + MOUNT_NOAUTO = 1 << 0, + MOUNT_NOFAIL = 1 << 1, + MOUNT_AUTOMOUNT = 1 << 2, + MOUNT_MAKEFS = 1 << 3, + MOUNT_GROWFS = 1 << 4, + MOUNT_RW_ONLY = 1 << 5, + MOUNT_PCRFS = 1 << 6, +} MountPointFlags; + +typedef struct Mount { + bool for_initrd; + char *what; + char *where; + char *fstype; + char *options; +} Mount; + +static void mount_array_free(Mount *mounts, size_t n); + +static bool arg_sysroot_check = false; +static const char *arg_dest = NULL; +static const char *arg_dest_late = NULL; +static bool arg_fstab_enabled = true; +static bool arg_swap_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 char *arg_usr_hash = NULL; +static VolatileMode arg_volatile_mode = _VOLATILE_MODE_INVALID; +static bool arg_verity = true; +static Mount *arg_mounts = NULL; +static size_t arg_n_mounts = 0; + +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_DESTRUCTOR_REGISTER(arg_usr_hash, freep); +STATIC_ARRAY_DESTRUCTOR_REGISTER(arg_mounts, arg_n_mounts, mount_array_free); + +static void mount_done(Mount *m) { + assert(m); + + free(m->what); + free(m->where); + free(m->fstype); + free(m->options); +} + +static void mount_array_free(Mount *mounts, size_t n) { + FOREACH_ARRAY(m, mounts, n) + mount_done(m); + + free(mounts); +} + +static int mount_array_add_internal( + bool for_initrd, + char *in_what, + char *in_where, + const char *in_fstype, + const char *in_options) { + + _cleanup_free_ char *what = NULL, *where = NULL, *fstype = NULL, *options = NULL; + int r; + + /* This takes what and where. */ + + what = ASSERT_PTR(in_what); + where = in_where; + + fstype = strdup(isempty(in_fstype) ? "auto" : in_fstype); + if (!fstype) + return -ENOMEM; + + if (streq(fstype, "swap")) + where = mfree(where); + + if (!isempty(in_options)) { + _cleanup_strv_free_ char **options_strv = NULL; + + r = strv_split_full(&options_strv, in_options, ",", 0); + if (r < 0) + return r; + + r = strv_make_nulstr(options_strv, &options, NULL); + } else + r = strv_make_nulstr(STRV_MAKE("defaults"), &options, NULL); + if (r < 0) + return r; + + if (!GREEDY_REALLOC(arg_mounts, arg_n_mounts + 1)) + return -ENOMEM; + + arg_mounts[arg_n_mounts++] = (Mount) { + .for_initrd = for_initrd, + .what = TAKE_PTR(what), + .where = TAKE_PTR(where), + .fstype = TAKE_PTR(fstype), + .options = TAKE_PTR(options), + }; + + return 0; +} + +static int mount_array_add(bool for_initrd, const char *str) { + _cleanup_free_ char *what = NULL, *where = NULL, *fstype = NULL, *options = NULL; + int r; + + assert(str); + + r = extract_many_words(&str, ":", EXTRACT_CUNESCAPE | EXTRACT_DONT_COALESCE_SEPARATORS, + &what, &where, &fstype, &options, NULL); + if (r < 0) + return r; + if (r < 2) + return -EINVAL; + if (!isempty(str)) + return -EINVAL; + + return mount_array_add_internal(for_initrd, TAKE_PTR(what), TAKE_PTR(where), fstype, options); +} + +static int mount_array_add_swap(bool for_initrd, const char *str) { + _cleanup_free_ char *what = NULL, *options = NULL; + int r; + + assert(str); + + r = extract_many_words(&str, ":", EXTRACT_CUNESCAPE | EXTRACT_DONT_COALESCE_SEPARATORS, + &what, &options, NULL); + if (r < 0) + return r; + if (r < 1) + return -EINVAL; + if (!isempty(str)) + return -EINVAL; + + return mount_array_add_internal(for_initrd, TAKE_PTR(what), NULL, "swap", options); +} + +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 *source, + const char *what, + const char *options, + MountPointFlags flags) { + + _cleanup_free_ char *name = NULL; + _cleanup_fclose_ FILE *f = NULL; + int r; + + assert(what); + + if (access("/proc/swaps", F_OK) < 0) { + log_info("Swap not supported, ignoring swap entry for %s.", what); + return 0; + } + + if (detect_container() > 0) { + log_info("Running in a container, ignoring swap entry for %s.", what); + return 0; + } + + if (arg_sysroot_check) { + log_info("%s should be enabled in the initrd, will request daemon-reload.", what); + return true; + } + + log_debug("Found swap entry what=%s makefs=%s growfs=%s pcrfs=%s noauto=%s nofail=%s", + what, + yes_no(flags & MOUNT_MAKEFS), yes_no(flags & MOUNT_GROWFS), yes_no(flags & MOUNT_PCRFS), + yes_no(flags & MOUNT_NOAUTO), yes_no(flags & MOUNT_NOFAIL)); + + 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, source, name, &f); + if (r < 0) + return r; + + fprintf(f, + "[Unit]\n" + "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n" + "SourcePath=%s\n", + source); + + r = generator_write_blockdev_dependency(f, what); + if (r < 0) + return r; + + fprintf(f, + "\n" + "[Swap]\n"); + + r = write_what(f, what); + if (r < 0) + return r; + + r = write_options(f, options); + 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, options, NULL); + if (r < 0) + return r; + + if (flags & MOUNT_MAKEFS) { + r = generator_hook_up_mkswap(arg_dest, what); + if (r < 0) + return r; + } + + if (flags & MOUNT_GROWFS) + /* TODO: swap devices must be wiped and recreated */ + log_warning("%s: growing swap devices is currently unsupported.", what); + if (flags & MOUNT_PCRFS) + log_warning("%s: measuring swap devices is currently unsupported.", what); + + if (!(flags & MOUNT_NOAUTO)) { + r = generator_add_symlink(arg_dest, SPECIAL_SWAP_TARGET, + (flags & MOUNT_NOFAIL) ? "wants" : "requires", name); + if (r < 0) + return r; + } + + return true; +} + +static bool mount_is_network(const char *fstype, const char *options) { + return fstab_test_option(options, "_netdev\0") || + (fstype && fstype_is_network(fstype)); +} + +static bool mount_in_initrd(const char *where, const char *options, bool accept_root) { + return fstab_test_option(options, "x-initrd.mount\0") || + (where && PATH_IN_SET(where, "/usr", accept_root ? "/" : NULL)); +} + +static int write_timeout( + FILE *f, + const char *where, + const char *opts, + const char *filter, + const char *variable) { + + _cleanup_free_ char *timeout = NULL; + usec_t u; + int r; + + r = fstab_filter_options(opts, filter, NULL, &timeout, NULL, 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(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; + int r; + + assert(f); + assert(opts); + + r = fstab_filter_options(opts, filter, NULL, NULL, &names, NULL); + 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, "as dependency", 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(); + + DISABLE_WARNING_FORMAT_NONLITERAL; + fprintf(f, format, res); + REENABLE_WARNING; + } + + return 0; +} + +static int write_after(FILE *f, const char *opts) { + return write_dependency(f, opts, + "x-systemd.after\0", "After=%1$s\n"); +} + +static int write_requires_after(FILE *f, const char *opts) { + return write_dependency(f, opts, + "x-systemd.requires\0", "After=%1$s\nRequires=%1$s\n"); +} + +static int write_before(FILE *f, const char *opts) { + return write_dependency(f, opts, + "x-systemd.before\0", "Before=%1$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_filter_options(opts, "x-systemd.requires-mounts-for\0", NULL, NULL, &paths, NULL); + 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 write_extra_dependencies(FILE *f, const char *opts) { + int r; + + assert(f); + + 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; + } + + return 0; +} + +static int mandatory_mount_drop_unapplicable_options( + MountPointFlags *flags, + const char *where, + const char *options, + char **ret_options) { + + int r; + + assert(flags); + assert(where); + assert(options); + assert(ret_options); + + if (!(*flags & (MOUNT_NOAUTO|MOUNT_NOFAIL|MOUNT_AUTOMOUNT))) { + _cleanup_free_ char *opts = NULL; + + opts = strdup(options); + if (!opts) + return -ENOMEM; + + *ret_options = TAKE_PTR(opts); + return 0; + } + + log_debug("Mount '%s' is mandatory, ignoring 'noauto', 'nofail', and 'x-systemd.automount' options.", + where); + + *flags &= ~(MOUNT_NOAUTO|MOUNT_NOFAIL|MOUNT_AUTOMOUNT); + + r = fstab_filter_options(options, "noauto\0nofail\0x-systemd.automount\0", NULL, NULL, NULL, ret_options); + if (r < 0) + return r; + + return 1; +} + +static int add_mount( + const char *source, + 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 *target_unit) { + + _cleanup_free_ char *name = NULL, *automount_name = NULL, *filtered = NULL, *where_escaped = NULL, + *opts_root_filtered = NULL; + _cleanup_strv_free_ char **wanted_by = NULL, **required_by = NULL; + _cleanup_fclose_ FILE *f = NULL; + int r; + + assert(what); + assert(where); + assert(opts); + assert(target_unit); + 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 (arg_sysroot_check) { + log_info("%s should be mounted in the initrd, will request daemon-reload.", where); + return true; + } + + r = fstab_filter_options(opts, "x-systemd.wanted-by\0", NULL, NULL, &wanted_by, NULL); + if (r < 0) + return r; + + r = fstab_filter_options(opts, "x-systemd.required-by\0", NULL, NULL, &required_by, NULL); + if (r < 0) + return r; + + if (path_equal(where, "/")) { + r = mandatory_mount_drop_unapplicable_options(&flags, where, opts, &opts_root_filtered); + if (r < 0) + return r; + opts = opts_root_filtered; + + if (!strv_isempty(wanted_by)) + log_debug("Ignoring 'x-systemd.wanted-by=' option for root device."); + if (!strv_isempty(required_by)) + log_debug("Ignoring 'x-systemd.required-by=' option for root device."); + + required_by = strv_free(required_by); + wanted_by = strv_free(wanted_by); + } + + 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, source, name, &f); + if (r < 0) + return r; + + fprintf(f, + "[Unit]\n" + "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n" + "SourcePath=%s\n", + source); + + if (STRPTR_IN_SET(fstype, "nfs", "nfs4") && !(flags & MOUNT_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 overridden by + * settings in /etc/fstab. */ + opts = strjoina("x-systemd.mount-timeout=infinity,retry=10000,nofail,", opts, ",fg"); + SET_FLAG(flags, MOUNT_NOFAIL, true); + } + + r = write_extra_dependencies(f, opts); + if (r < 0) + return r; + + /* Order the mount unit we generate relative to target_unit, so that DefaultDependencies= on the + * target unit won't affect us. */ + if (!FLAGS_SET(flags, MOUNT_NOFAIL)) + fprintf(f, "Before=%s\n", target_unit); + + if (passno != 0) { + r = generator_write_fsck_deps(f, dest, what, where, fstype); + if (r < 0) + return r; + } + + r = generator_write_blockdev_dependency(f, what); + if (r < 0) + return r; + + fprintf(f, + "\n" + "[Mount]\n"); + + r = write_what(f, what); + if (r < 0) + return r; + + 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); + + if (!isempty(fstype) && !streq(fstype, "auto")) { + _cleanup_free_ char *t = NULL; + + 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; + + if (in_initrd() && path_equal(where, "/sysroot") && is_device_path(what)) { + r = generator_write_initrd_root_device_deps(dest, what); + 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; + + if (flags & MOUNT_RW_ONLY) + fprintf(f, "ReadWriteOnly=yes\n"); + + r = fflush_and_check(f); + if (r < 0) + return log_error_errno(r, "Failed to write unit file %s: %m", name); + + if (flags & MOUNT_MAKEFS) { + r = generator_hook_up_mkfs(dest, what, where, fstype); + if (r < 0) + return r; + } + + if (flags & MOUNT_GROWFS) { + r = generator_hook_up_growfs(dest, where, target_unit); + if (r < 0) + return r; + } + + if (flags & MOUNT_PCRFS) { + r = efi_measured_uki(LOG_WARNING); + if (r == 0) + log_debug("Kernel stub did not measure kernel image into PCR, skipping userspace measurement, too."); + else if (r > 0) { + r = generator_hook_up_pcrfs(dest, where, target_unit); + if (r < 0) + return r; + } + } + + if (!FLAGS_SET(flags, MOUNT_AUTOMOUNT)) { + if (!FLAGS_SET(flags, MOUNT_NOAUTO) && strv_isempty(wanted_by) && strv_isempty(required_by)) { + r = generator_add_symlink(dest, target_unit, + (flags & MOUNT_NOFAIL) ? "wants" : "requires", name); + if (r < 0) + return r; + } else { + STRV_FOREACH(s, wanted_by) { + r = generator_add_symlink(dest, *s, "wants", name); + if (r < 0) + return r; + } + + STRV_FOREACH(s, required_by) { + r = generator_add_symlink(dest, *s, "requires", name); + if (r < 0) + return r; + } + } + } else { + r = unit_name_from_path(where, ".automount", &automount_name); + if (r < 0) + return log_error_errno(r, "Failed to generate unit name: %m"); + + f = safe_fclose(f); + + r = generator_open_unit_file(dest, source, 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, + "\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, target_unit, + (flags & MOUNT_NOFAIL) ? "wants" : "requires", automount_name); + if (r < 0) + return r; + } + + return true; +} + +static int do_daemon_reload(void) { + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + int r, k; + + log_debug("Calling org.freedesktop.systemd1.Manager.Reload()..."); + + r = bus_connect_system_systemd(&bus); + if (r < 0) + return log_error_errno(r, "Failed to get D-Bus connection: %m"); + + r = bus_service_manager_reload(bus); + if (r < 0) + return r; + + /* We need to requeue the two targets so that any new units which previously were not part of the + * targets, and which we now added, will be started. */ + + r = 0; + FOREACH_STRING(unit, SPECIAL_INITRD_FS_TARGET, SPECIAL_SWAP_TARGET) { + log_info("Requesting %s/start/replace...", unit); + + k = bus_call_method(bus, bus_systemd_mgr, "StartUnit", &error, NULL, "ss", unit, "replace"); + if (k < 0) { + log_error_errno(k, "Failed to (re)start %s: %s", unit, bus_error_message(&error, r)); + RET_GATHER(r, k); + } + } + + return r; +} + +static const char* sysroot_fstab_path(void) { + return getenv("SYSTEMD_SYSROOT_FSTAB") ?: "/sysroot/etc/fstab"; +} + +static bool sysfs_check(void) { + static int cached = -1; + int r; + + if (cached < 0) { + r = getenv_bool_secure("SYSTEMD_SYSFS_CHECK"); + if (r < 0 && r != -ENXIO) + log_debug_errno(r, "Failed to parse $SYSTEMD_SYSFS_CHECK, ignoring: %m"); + cached = r != 0; + } + + return cached; +} + +static int add_sysusr_sysroot_usr_bind_mount(const char *source) { + return add_mount(source, + arg_dest, + "/sysusr/usr", + "/sysroot/usr", + NULL, + NULL, + "bind", + 0, + 0, + SPECIAL_INITRD_FS_TARGET); +} + +static MountPointFlags fstab_options_to_flags(const char *options, bool is_swap) { + MountPointFlags flags = 0; + + if (fstab_test_option(options, "x-systemd.makefs\0")) + flags |= MOUNT_MAKEFS; + if (fstab_test_option(options, "x-systemd.growfs\0")) + flags |= MOUNT_GROWFS; + if (fstab_test_option(options, "x-systemd.pcrfs\0")) + flags |= MOUNT_PCRFS; + if (fstab_test_yes_no_option(options, "noauto\0" "auto\0")) + flags |= MOUNT_NOAUTO; + if (fstab_test_yes_no_option(options, "nofail\0" "fail\0")) + flags |= MOUNT_NOFAIL; + + if (!is_swap) { + if (fstab_test_option(options, "x-systemd.rw-only\0")) + flags |= MOUNT_RW_ONLY; + if (fstab_test_option(options, + "comment=systemd.automount\0" + "x-systemd.automount\0")) + flags |= MOUNT_AUTOMOUNT; + } + + return flags; +} + +static int canonicalize_mount_path(const char *path, const char *type, bool prefix_sysroot, char **ret) { + _cleanup_free_ char *p = NULL; + bool changed; + int r; + + assert(path); + assert(type); + assert(STR_IN_SET(type, "where", "what")); + assert(ret); + + // FIXME: when chase() learns to chase non-existent paths, use this here and drop the prefixing with + // /sysroot on error below. + r = chase(path, prefix_sysroot ? "/sysroot" : NULL, CHASE_PREFIX_ROOT | CHASE_NONEXISTENT, &p, NULL); + if (r < 0) { + log_debug_errno(r, "Failed to chase '%s', using as-is: %m", path); + + if (prefix_sysroot) + p = path_join("/sysroot", path); + else + p = strdup(path); + if (!p) + return log_oom(); + + path_simplify(p); + } + + changed = !streq(path, p); + if (changed) + log_debug("Canonicalized %s=%s to %s", type, path, p); + + *ret = TAKE_PTR(p); + return changed; +} + +static int parse_fstab_one( + const char *source, + const char *what_original, + const char *where_original, + const char *fstype, + const char *options, + int passno, + bool prefix_sysroot, + bool accept_root, /* This takes an effect only when prefix_sysroot is true. */ + bool use_swap_enabled) { + + _cleanup_free_ char *what = NULL, *where = NULL, *opts = NULL; + MountPointFlags flags; + bool is_swap, where_changed; + int r; + + assert(what_original); + assert(fstype); + assert(options); + + if (prefix_sysroot && !mount_in_initrd(where_original, options, accept_root)) + return 0; + + is_swap = streq_ptr(fstype, "swap"); + if (is_swap && use_swap_enabled && !arg_swap_enabled) { + log_info("Swap unit generation disabled on kernel command line, ignoring swap entry for %s.", what_original); + return 0; + } + + what = fstab_node_to_udev_node(what_original); + if (!what) + return log_oom(); + + if (path_is_read_only_fs("/sys") > 0 && + (streq(what, "sysfs") || + (sysfs_check() && is_device_path(what)))) { + log_info("/sys/ is read-only (running in a container?), ignoring mount for %s.", what); + return 0; + } + + flags = fstab_options_to_flags(options, is_swap); + + if (is_swap) + return add_swap(source, what, options, flags); + + if (passno < 0) + passno = is_device_path(what); + + assert(where_original); /* 'where' is not necessary for swap entry. */ + + if (!is_path(where_original)) { + log_warning("Mount point %s is not a valid path, ignoring.", where_original); + return 0; + } + + /* 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 = canonicalize_mount_path(where_original, "where", prefix_sysroot, &where); + if (r < 0) + return r; + where_changed = r > 0; + + if (prefix_sysroot && fstab_is_bind(options, fstype)) { + /* When in initrd, the source of bind mount needs to be prepended with /sysroot as well. */ + _cleanup_free_ char *p = NULL; + + r = canonicalize_mount_path(what, "what", prefix_sysroot, &p); + if (r < 0) + return r; + + free_and_replace(what, p); + } + + log_debug("Found entry what=%s where=%s type=%s makefs=%s growfs=%s pcrfs=%s noauto=%s nofail=%s", + what, where, strna(fstype), + yes_no(flags & MOUNT_MAKEFS), yes_no(flags & MOUNT_GROWFS), yes_no(flags & MOUNT_PCRFS), + yes_no(flags & MOUNT_NOAUTO), yes_no(flags & MOUNT_NOFAIL)); + + bool is_sysroot = in_initrd() && path_equal(where, "/sysroot"); + /* See comment from add_sysroot_usr_mount() about the need for extra indirection in case /usr needs + * to be mounted in order for the root fs to be synthesized based on configuration included in /usr/, + * e.g. systemd-repart. */ + bool is_sysroot_usr = in_initrd() && path_equal(where, "/sysroot/usr"); + + const char *target_unit = + is_sysroot ? SPECIAL_INITRD_ROOT_FS_TARGET : + is_sysroot_usr ? SPECIAL_INITRD_USR_FS_TARGET : + prefix_sysroot ? SPECIAL_INITRD_FS_TARGET : + mount_is_network(fstype, options) ? SPECIAL_REMOTE_FS_TARGET : + SPECIAL_LOCAL_FS_TARGET; + + /* nofail, noauto and x-systemd.automount don't make sense for critical filesystems we must mount in initrd. */ + if (is_sysroot || is_sysroot_usr) { + r = mandatory_mount_drop_unapplicable_options(&flags, where, options, &opts); + if (r < 0) + return r; + options = opts; + } + + r = add_mount(source, + arg_dest, + what, + is_sysroot_usr ? "/sysusr/usr" : where, + !is_sysroot_usr && where_changed ? where_original : NULL, + fstype, + options, + passno, + flags, + target_unit); + if (r <= 0) + return r; + + if (is_sysroot_usr) { + log_debug("Synthesizing fstab entry what=/sysusr/usr where=/sysroot/usr opts=bind"); + r = add_sysusr_sysroot_usr_bind_mount(source); + if (r < 0) + return r; + } + + return true; +} + +static int parse_fstab(bool prefix_sysroot) { + _cleanup_endmntent_ FILE *f = NULL; + const char *fstab; + struct mntent *me; + int r, ret = 0; + + if (prefix_sysroot) + fstab = sysroot_fstab_path(); + else { + fstab = fstab_path(); + assert(!arg_sysroot_check); + } + + log_debug("Parsing %s...", fstab); + + f = setmntent(fstab, "re"); + if (!f) { + if (errno == ENOENT) + return 0; + + return log_error_errno(errno, "Failed to open %s: %m", fstab); + } + + while ((me = getmntent(f))) { + r = parse_fstab_one(fstab, + me->mnt_fsname, me->mnt_dir, me->mnt_type, me->mnt_opts, me->mnt_passno, + prefix_sysroot, + /* accept_root = */ false, + /* use_swap_enabled = */ true); + if (r < 0 && ret >= 0) + ret = r; + if (arg_sysroot_check && r > 0) + return true; /* We found a mount or swap that would be started… */ + } + + return ret; +} + +static int sysroot_is_nfsroot(void) { + union in_addr_union u; + const char *sep, *a; + int r; + + assert(arg_root_what); + + /* From dracut.cmdline(7). + * + * root=[<server-ip>:]<root-dir>[:<nfs-options>] + * root=nfs:[<server-ip>:]<root-dir>[:<nfs-options>], + * root=nfs4:[<server-ip>:]<root-dir>[:<nfs-options>], + * root={dhcp|dhcp6} + * + * mount nfs share from <server-ip>:/<root-dir>, if no server-ip is given, use dhcp next_server. + * If server-ip is an IPv6 address it has to be put in brackets, e.g. [2001:DB8::1]. NFS options + * can be appended with the prefix ":" or "," and are separated by ",". */ + + if (path_equal(arg_root_what, "/dev/nfs") || + STR_IN_SET(arg_root_what, "dhcp", "dhcp6") || + STARTSWITH_SET(arg_root_what, "nfs:", "nfs4:")) + return true; + + /* IPv6 address */ + if (arg_root_what[0] == '[') { + sep = strchr(arg_root_what + 1, ']'); + if (!sep) + return -EINVAL; + + a = strndupa_safe(arg_root_what + 1, sep - arg_root_what - 1); + + r = in_addr_from_string(AF_INET6, a, &u); + if (r < 0) + return r; + + return true; + } + + /* IPv4 address */ + sep = strchr(arg_root_what, ':'); + if (sep) { + a = strndupa_safe(arg_root_what, sep - arg_root_what); + + if (in_addr_from_string(AF_INET, a, &u) >= 0) + return true; + } + + /* root directory without address */ + return path_is_absolute(arg_root_what) && !path_startswith(arg_root_what, "/dev"); +} + +static int add_sysroot_mount(void) { + _cleanup_free_ char *what = NULL; + const char *opts, *fstype; + bool default_rw, makefs; + MountPointFlags flags; + 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 gpt-auto-generator */ + log_debug("Skipping root directory handling, as gpt-auto was requested."); + return 0; + } else if (streq(arg_root_what, "fstab")) { + /* This is handled by parse_fstab */ + log_debug("Using initrd's fstab for /sysroot/ configuration."); + return 0; + } + + r = sysroot_is_nfsroot(); + if (r < 0) + log_debug_errno(r, "Failed to determine if the root directory is on NFS, assuming not: %m"); + else if (r > 0) { + /* This is handled by the kernel or the initrd */ + log_debug("Skipping root directory handling, as root on NFS was requested."); + return 0; + } + + if (startswith(arg_root_what, "cifs://")) { + log_debug("Skipping root directory handling, as root on CIFS was requested."); + return 0; + } + + if (startswith(arg_root_what, "iscsi:")) { + log_debug("Skipping root directory handling, as root on iSCSI was requested."); + return 0; + } + + if (startswith(arg_root_what, "live:")) { + log_debug("Skipping root directory handling, as root on live image was requested."); + return 0; + } + + if (streq(arg_root_what, "tmpfs")) { + /* If root=tmpfs is specified, then take this as shortcut for a writable tmpfs mount as root */ + + what = strdup("rootfs"); /* just a pretty name, to show up in /proc/self/mountinfo */ + if (!what) + return log_oom(); + + fstype = arg_root_fstype ?: "tmpfs"; /* tmpfs, unless overridden */ + + default_rw = true; /* writable, unless overridden */; + } else { + + what = fstab_node_to_udev_node(arg_root_what); + if (!what) + return log_oom(); + + fstype = arg_root_fstype; /* if not specified explicitly, don't default to anything here */ + + default_rw = false; /* read-only, unless overridden */ + } + + if (!arg_root_options) + opts = arg_root_rw > 0 || (arg_root_rw < 0 && default_rw) ? "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 opts=%s", what, strna(arg_root_fstype), strempty(opts)); + + makefs = fstab_test_option(opts, "x-systemd.makefs\0"); + flags = makefs * MOUNT_MAKEFS; + + return add_mount("/proc/cmdline", + arg_dest, + what, + "/sysroot", + NULL, + fstype, + opts, + is_device_path(what) ? 1 : 0, /* passno */ + flags, /* makefs off, pcrfs off, noauto off, nofail off, automount off */ + SPECIAL_INITRD_ROOT_FS_TARGET); +} + +static int add_sysroot_usr_mount(void) { + _cleanup_free_ char *what = NULL; + const char *opts; + bool makefs; + MountPointFlags flags; + int r; + + /* Returns 0 if we didn't do anything, > 0 if we either generated a unit for the /usr/ mount, or we + * know for sure something else did */ + + 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 (isempty(arg_usr_what)) { + log_debug("Could not find a mount.usr= entry on the kernel command line."); + return 0; + } + + if (streq(arg_usr_what, "gpt-auto")) { + /* This is handled by the gpt-auto generator */ + log_debug("Skipping /usr/ directory handling, as gpt-auto was requested."); + return 1; /* systemd-gpt-auto-generator will generate a unit for this, hence report that a + * unit file is being created for the host /usr/ mount. */ + } else if (streq(arg_usr_what, "fstab")) { + /* This is handled by parse_fstab */ + log_debug("Using initrd's fstab for /sysroot/usr/ configuration."); + return 1; /* parse_fstab will generate a unit for this, hence report that a + * unit file is being created for the host /usr/ mount. */ + } + + if (path_equal(arg_usr_what, "/dev/nfs")) { + /* This is handled by the initrd (if at all supported, that is) */ + log_debug("Skipping /usr/ directory handling, as /dev/nfs was requested."); + return 1; /* As above, report that NFS code will create the unit */ + } + + 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; + + /* When mounting /usr from the initrd, we add an extra level of indirection: we first mount the /usr/ + * partition to /sysusr/usr/, and then afterwards bind mount that to /sysroot/usr/. We do this so + * that we can cover for systems that initially only have a /usr/ around and where the root fs needs + * to be synthesized, based on configuration included in /usr/, e.g. systemd-repart. Software like + * this should order itself after initrd-usr-fs.target and before initrd-fs.target; and it should + * look into both /sysusr/ and /sysroot/ for the configuration data to apply. */ + + log_debug("Found entry what=%s where=/sysusr/usr type=%s opts=%s", what, strna(arg_usr_fstype), strempty(opts)); + + makefs = fstab_test_option(opts, "x-systemd.makefs\0"); + flags = makefs * MOUNT_MAKEFS; + + r = add_mount("/proc/cmdline", + arg_dest, + what, + "/sysusr/usr", + NULL, + arg_usr_fstype, + opts, + is_device_path(what) ? 1 : 0, /* passno */ + flags, + SPECIAL_INITRD_USR_FS_TARGET); + if (r < 0) + return r; + + log_debug("Synthesizing entry what=/sysusr/usr where=/sysroot/usr opts=bind"); + + r = add_sysusr_sysroot_usr_bind_mount("/proc/cmdline"); + if (r < 0) + return r; + + return 1; +} + +static int add_sysroot_usr_mount_or_fallback(void) { + int r; + + r = add_sysroot_usr_mount(); + if (r != 0) + return r; + + /* OK, so we didn't write anything out for /sysusr/usr/ nor /sysroot/usr/. In this case, let's make + * sure that initrd-usr-fs.target is at least ordered after sysroot.mount so that services that order + * themselves after it get the guarantee that /usr/ is definitely mounted somewhere. */ + + return generator_add_symlink( + arg_dest, + SPECIAL_INITRD_USR_FS_TARGET, + "requires", + "sysroot.mount"); +} + +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_DIR "/" 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("/proc/cmdline", + arg_dest_late, + "tmpfs", + "/var", + NULL, + "tmpfs", + "mode=0755" TMPFS_LIMITS_VAR, + 0, + 0, + SPECIAL_LOCAL_FS_TARGET); +} + +static int add_mounts_from_cmdline(void) { + int r = 0; + + /* Handle each entries found in cmdline as a fstab entry. */ + + FOREACH_ARRAY(m, arg_mounts, arg_n_mounts) { + if (m->for_initrd && !in_initrd()) + continue; + + RET_GATHER(r, parse_fstab_one("/proc/cmdline", + m->what, + m->where, + m->fstype, + m->options, + /* passno = */ -1, + /* prefix_sysroot = */ !m->for_initrd && in_initrd(), + /* accept_root = */ true, + /* use_swap_enabled = */ false)); + } + + return r; +} + +static int add_mounts_from_creds(bool prefix_sysroot) { + _cleanup_free_ void *b = NULL; + struct mntent *me; + size_t bs; + int r; + + assert(in_initrd() || !prefix_sysroot); + + r = read_credential_with_decryption( + in_initrd() && !prefix_sysroot ? "fstab.extra.initrd" : "fstab.extra", + &b, &bs); + if (r <= 0) + return r; + + _cleanup_fclose_ FILE *f = NULL; + f = fmemopen_unlocked(b, bs, "r"); + if (!f) + return log_oom(); + + r = 0; + + while ((me = getmntent(f))) + RET_GATHER(r, parse_fstab_one("/run/credentials", + me->mnt_fsname, + me->mnt_dir, + me->mnt_type, + me->mnt_opts, + me->mnt_passno, + /* prefix_sysroot = */ prefix_sysroot, + /* accept_root = */ true, + /* use_swap_enabled = */ true)); + + return r; +} + +static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { + int r; + + assert(key); + + /* 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 = fstab_set_enabled(r); + + } else if (streq(key, "root")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + return free_and_strdup_warn(&arg_root_what, empty_to_null(value)); + + } else if (streq(key, "rootfstype")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + return free_and_strdup_warn(&arg_root_fstype, empty_to_null(value)); + + } else if (streq(key, "rootflags")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + if (!strextend_with_separator(&arg_root_options, ",", value)) + return log_oom(); + + } else if (streq(key, "roothash")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + return free_and_strdup_warn(&arg_root_hash, empty_to_null(value)); + + } else if (streq(key, "mount.usr")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + return free_and_strdup_warn(&arg_usr_what, empty_to_null(value)); + + } else if (streq(key, "mount.usrfstype")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + return free_and_strdup_warn(&arg_usr_fstype, empty_to_null(value)); + + } else if (streq(key, "mount.usrflags")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + if (!strextend_with_separator(&arg_usr_options, ",", value)) + return log_oom(); + + } else if (streq(key, "usrhash")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + return free_and_strdup_warn(&arg_usr_hash, empty_to_null(value)); + + } 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_errno(m, "Failed to parse systemd.volatile= argument: %s", value); + else + arg_volatile_mode = m; + } else + arg_volatile_mode = VOLATILE_YES; + + } else if (streq(key, "systemd.swap")) { + + r = value ? parse_boolean(value) : 1; + if (r < 0) + log_warning("Failed to parse systemd.swap switch %s. Ignoring.", value); + else + arg_swap_enabled = r; + + } else if (streq(key, "systemd.verity")) { + + r = value ? parse_boolean(value) : 1; + if (r < 0) + log_warning("Failed to parse systemd.verity= kernel command line switch %s. Ignoring.", value); + else + arg_verity = r; + + } else if (STR_IN_SET(key, "systemd.mount-extra", "rd.systemd.mount-extra")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + r = mount_array_add(startswith(key, "rd."), value); + if (r < 0) + log_warning("Failed to parse systemd.mount-extra= option, ignoring: %s", value); + + } else if (STR_IN_SET(key, "systemd.swap-extra", "rd.systemd.swap-extra")) { + + if (proc_cmdline_value_missing(key, value)) + return 0; + + r = mount_array_add_swap(startswith(key, "rd."), value); + if (r < 0) + log_warning("Failed to parse systemd.swap-extra= option, ignoring: %s", value); + } + + return 0; +} + +static int determine_device( + char **what, + int *rw, + char **options, + const char *hash, + const char *name) { + + assert(what); + assert(name); + + /* If we have a hash but no device then Verity is used, and we use the DM device. */ + if (*what) + return 0; + + if (!hash) + return 0; + + if (!arg_verity) + return 0; + + *what = path_join("/dev/mapper/", name); + if (!*what) + return log_oom(); + + /* Verity is always read-only */ + if (rw) + *rw = false; + if (options && !strextend_with_separator(options, ",", "ro")) + return log_oom(); + + log_info("Using verity %s device %s.", name, *what); + return 1; +} + +static int determine_root(void) { + return determine_device(&arg_root_what, &arg_root_rw, NULL, arg_root_hash, "root"); +} + +static int determine_usr(void) { + return determine_device(&arg_usr_what, NULL, &arg_usr_options, arg_usr_hash, "usr"); +} + +/* If arg_sysroot_check is false, run as generator in the usual fashion. + * If it is true, check /sysroot/etc/fstab for any units that we'd want to mount + * in the initrd, and call daemon-reload. We will get reinvoked as a generator, + * with /sysroot/etc/fstab available, and then we can write additional units based + * on that file. */ +static int run_generator(void) { + int r = 0; + + 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(); + (void) determine_usr(); + + if (arg_sysroot_check) { + r = parse_fstab(/* prefix_sysroot = */ true); + if (r == 0) + log_debug("Nothing interesting found, not doing daemon-reload."); + if (r > 0) + r = do_daemon_reload(); + return r; + } + + r = 0; + + /* Always honour root= and usr= in the kernel command line if we are in an initrd */ + if (in_initrd()) { + RET_GATHER(r, add_sysroot_mount()); + + RET_GATHER(r, add_sysroot_usr_mount_or_fallback()); + + RET_GATHER(r, add_volatile_root()); + } else + RET_GATHER(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 */ + RET_GATHER(r, parse_fstab(/* prefix_sysroot = */ false)); + + /* If running in the initrd also parse the /etc/fstab from the host */ + if (in_initrd()) + RET_GATHER(r, parse_fstab(/* prefix_sysroot = */ true)); + else + RET_GATHER(r, generator_enable_remount_fs_service(arg_dest)); + } + + RET_GATHER(r, add_mounts_from_cmdline()); + + RET_GATHER(r, add_mounts_from_creds(/* prefix_sysroot = */ false)); + + if (in_initrd()) + RET_GATHER(r, add_mounts_from_creds(/* prefix_sysroot = */ true)); + + return r; +} + +static int run(int argc, char **argv) { + arg_sysroot_check = invoked_as(argv, "systemd-sysroot-fstab-check"); + + if (arg_sysroot_check) { + /* Run as in systemd-sysroot-fstab-check mode */ + log_setup(); + + if (strv_length(argv) > 1) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "This program takes no arguments."); + if (!in_initrd()) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "This program is only useful in the initrd."); + } else { + /* Run in generator mode */ + log_setup_generator(); + + if (!IN_SET(strv_length(argv), 2, 4)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "This program takes one or three arguments."); + + arg_dest = ASSERT_PTR(argv[1]); + arg_dest_late = ASSERT_PTR(argv[argc > 3 ? 3 : 1]); + } + + return run_generator(); +} + +DEFINE_MAIN_FUNCTION(run); |