/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include "alloc-util.h" #include "chase-symlinks.h" #include "fd-util.h" #include "fileio.h" #include "fstab-util.h" #include "generator.h" #include "in-addr-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 "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 { 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, } MountPointFlags; 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_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 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 (!arg_swap_enabled) { log_info("Swap unit generation disabled on kernel command line, ignoring fstab swap entry for %s.", what); return 0; } 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, fstab_path(), name, &f); if (r < 0) return r; fprintf(f, "[Unit]\n" "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n" "SourcePath=%s\n", fstab_path()); 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, 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 & 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_NOAUTO)) { r = generator_add_symlink(arg_dest, SPECIAL_SWAP_TARGET, (flags & MOUNT_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; 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 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_strv_free_ char **wanted_by = NULL, **required_by = 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; 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, "/")) { if (flags & MOUNT_NOAUTO) log_warning("Ignoring \"noauto\" option for root device"); if (flags & MOUNT_NOFAIL) log_warning("Ignoring \"nofail\" option for root device"); if (flags & MOUNT_AUTOMOUNT) log_warning("Ignoring \"automount\" option for root device"); if (!strv_isempty(wanted_by)) log_warning("Ignoring \"x-systemd.wanted-by=\" option for root device"); if (!strv_isempty(required_by)) log_warning("Ignoring \"x-systemd.required-by=\" option for root device"); required_by = strv_free(required_by); wanted_by = strv_free(wanted_by); SET_FLAG(flags, MOUNT_NOAUTO | MOUNT_NOFAIL | MOUNT_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, fstab_path(), 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 the post unit, so that DefaultDependencies= on the * target unit won't affect us. */ if (post && !FLAGS_SET(flags, MOUNT_NOFAIL)) fprintf(f, "Before=%s\n", post); 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; 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, post); 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, post, (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, fstab_path(), 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, post, (flags & MOUNT_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; struct mntent *me; int r = 0; fstab = initrd ? "/sysroot/etc/fstab" : fstab_path(); 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))) { _cleanup_free_ char *where = NULL, *what = NULL, *canonical_where = NULL; bool makefs, growfs, noauto, nofail; MountPointFlags flags; int k; if (initrd && !mount_in_initrd(me)) continue; what = fstab_node_to_udev_node(me->mnt_fsname); if (!what) return log_oom(); if (path_is_read_only_fs("/sys") > 0) { if (streq(what, "sysfs")) { log_info("Running in a container, ignoring fstab entry for %s.", what); continue; } if (is_device_path(what)) { 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); /* 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. */ k = chase_symlinks(where, initrd ? "/sysroot" : NULL, CHASE_PREFIX_ROOT | CHASE_NONEXISTENT, &canonical_where, NULL); if (k < 0) /* If we can't canonicalize we continue on as if it wasn't a symlink */ log_debug_errno(k, "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)); flags = makefs * MOUNT_MAKEFS | growfs * MOUNT_GROWFS | noauto * MOUNT_NOAUTO | nofail * MOUNT_NOFAIL; if (streq(me->mnt_type, "swap")) k = add_swap(what, me, flags); else { bool rw_only, automount; const char *post; rw_only = fstab_test_option(me->mnt_opts, "x-systemd.rw-only\0"); automount = fstab_test_option(me->mnt_opts, "comment=systemd.automount\0" "x-systemd.automount\0"); flags |= rw_only * MOUNT_RW_ONLY | automount * MOUNT_AUTOMOUNT; 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, flags, post, fstab); } if (r >= 0 && k < 0) r = k; } return r; } 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=[:][:] * root=nfs:[:][:], * root=nfs4:[:][:], * root={dhcp|dhcp6} * * mount nfs share from :/, 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; 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; } 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)); 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, 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; 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 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. */ } 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)); r = add_mount(arg_dest, what, "/sysusr/usr", NULL, arg_usr_fstype, opts, is_device_path(what) ? 1 : 0, /* passno */ 0, SPECIAL_INITRD_USR_FS_TARGET, "/proc/cmdline"); if (r < 0) return r; log_debug("Synthesizing entry what=/sysusr/usr where=/sysrootr/usr opts=bind"); r = add_mount(arg_dest, "/sysusr/usr", "/sysroot/usr", NULL, NULL, "bind", 0, 0, SPECIAL_INITRD_FS_TARGET, "/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 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(arg_dest_late, "tmpfs", "/var", NULL, "tmpfs", "mode=0755" TMPFS_LIMITS_VAR, 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; return free_and_strdup_warn(&arg_root_what, value); } else if (streq(key, "rootfstype")) { if (proc_cmdline_value_missing(key, value)) return 0; return free_and_strdup_warn(&arg_root_fstype, 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, value); } else if (streq(key, "mount.usr")) { if (proc_cmdline_value_missing(key, value)) return 0; return free_and_strdup_warn(&arg_usr_what, value); } else if (streq(key, "mount.usrfstype")) { if (proc_cmdline_value_missing(key, value)) return 0; return free_and_strdup_warn(&arg_usr_fstype, 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, 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; } return 0; } static int determine_device(char **what, 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; *what = path_join("/dev/mapper/", name); if (!*what) 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_hash, "root"); } static int determine_usr(void) { return determine_device(&arg_usr_what, arg_usr_hash, "usr"); } 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(); (void) determine_usr(); /* 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_or_fallback(); 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);