| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <fcntl.h> |
| #include <sys/ioctl.h> |
| #include <sys/statfs.h> |
| #include <blkid/blkid.h> |
| |
| #ifdef HAVE_LINUX_BTRFS_H |
| #include <linux/btrfs.h> |
| #endif |
| |
| #include "sd-id128.h" |
| #include "libudev.h" |
| #include "path-util.h" |
| #include "util.h" |
| #include "mkdir.h" |
| #include "missing.h" |
| #include "udev-util.h" |
| #include "special.h" |
| #include "unit-name.h" |
| #include "virt.h" |
| #include "generator.h" |
| #include "gpt.h" |
| #include "fileio.h" |
| #include "efivars.h" |
| #include "blkid-util.h" |
| |
| static const char *arg_dest = "/tmp"; |
| static bool arg_enabled = true; |
| static bool arg_root_enabled = true; |
| static bool arg_root_rw = false; |
| |
| static int add_swap(const char *path) { |
| _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| |
| assert(path); |
| |
| log_debug("Adding swap: %s", path); |
| |
| name = unit_name_from_path(path, ".swap"); |
| if (!name) |
| return log_oom(); |
| |
| unit = strjoin(arg_dest, "/", name, NULL); |
| if (!unit) |
| return log_oom(); |
| |
| f = fopen(unit, "wxe"); |
| if (!f) { |
| log_error("Failed to create unit file %s: %m", unit); |
| return -errno; |
| } |
| |
| fprintf(f, |
| "# Automatically generated by systemd-gpt-auto-generator\n\n" |
| "[Unit]\n" |
| "Description=Swap Partition\n" |
| "Documentation=man:systemd-gpt-auto-generator(8)\n\n" |
| "[Swap]\n" |
| "What=%s\n", |
| path); |
| |
| fflush(f); |
| if (ferror(f)) { |
| log_error("Failed to write unit file %s: %m", unit); |
| return -errno; |
| } |
| |
| lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL); |
| if (!lnk) |
| return log_oom(); |
| |
| mkdir_parents_label(lnk, 0755); |
| if (symlink(unit, lnk) < 0) { |
| log_error("Failed to create symlink %s: %m", lnk); |
| return -errno; |
| } |
| |
| return 0; |
| } |
| |
| static int add_cryptsetup(const char *id, const char *what, bool rw, char **device) { |
| _cleanup_free_ char *e = NULL, *n = NULL, *p = NULL, *d = NULL, *to = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| char *from, *ret; |
| int r; |
| |
| assert(id); |
| assert(what); |
| assert(device); |
| |
| d = unit_name_from_path(what, ".device"); |
| if (!d) |
| return log_oom(); |
| |
| e = unit_name_escape(id); |
| if (!e) |
| return log_oom(); |
| |
| n = unit_name_build("systemd-cryptsetup", e, ".service"); |
| if (!n) |
| return log_oom(); |
| |
| p = strjoin(arg_dest, "/", n, NULL); |
| if (!n) |
| return log_oom(); |
| |
| f = fopen(p, "wxe"); |
| if (!f) { |
| log_error("Failed to create unit file %s: %m", p); |
| return -errno; |
| } |
| |
| fprintf(f, |
| "# Automatically generated by systemd-gpt-auto-generator\n\n" |
| "[Unit]\n" |
| "Description=Cryptography Setup for %%I\n" |
| "Documentation=man:systemd-gpt-auto-generator(8) man:systemd-cryptsetup@.service(8)\n" |
| "DefaultDependencies=no\n" |
| "Conflicts=umount.target\n" |
| "BindsTo=dev-mapper-%%i.device %s\n" |
| "Before=umount.target cryptsetup.target\n" |
| "After=%s\n" |
| "IgnoreOnIsolate=true\n" |
| "After=systemd-readahead-collect.service systemd-readahead-replay.service\n\n" |
| "[Service]\n" |
| "Type=oneshot\n" |
| "RemainAfterExit=yes\n" |
| "TimeoutSec=0\n" /* the binary handles timeouts anyway */ |
| "ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '' '%s'\n" |
| "ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n", |
| d, d, |
| id, what, rw ? "" : "read-only", |
| id); |
| |
| fflush(f); |
| if (ferror(f)) { |
| log_error("Failed to write file %s: %m", p); |
| return -errno; |
| } |
| |
| from = strappenda("../", n); |
| |
| to = strjoin(arg_dest, "/", d, ".wants/", n, NULL); |
| if (!to) |
| return log_oom(); |
| |
| mkdir_parents_label(to, 0755); |
| if (symlink(from, to) < 0) { |
| log_error("Failed to create symlink %s: %m", to); |
| return -errno; |
| } |
| |
| free(to); |
| to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL); |
| if (!to) |
| return log_oom(); |
| |
| mkdir_parents_label(to, 0755); |
| if (symlink(from, to) < 0) { |
| log_error("Failed to create symlink %s: %m", to); |
| return -errno; |
| } |
| |
| free(to); |
| to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL); |
| if (!to) |
| return log_oom(); |
| |
| mkdir_parents_label(to, 0755); |
| if (symlink(from, to) < 0) { |
| log_error("Failed to create symlink %s: %m", to); |
| return -errno; |
| } |
| |
| free(p); |
| p = strjoin(arg_dest, "/dev-mapper-", e, ".device.d/50-job-timeout-sec-0.conf", NULL); |
| if (!p) |
| return log_oom(); |
| |
| mkdir_parents_label(p, 0755); |
| r = write_string_file(p, |
| "# Automatically generated by systemd-gpt-auto-generator\n\n" |
| "[Unit]\n" |
| "JobTimeoutSec=0\n"); /* the binary handles timeouts anyway */ |
| if (r < 0) { |
| log_error("Failed to write device drop-in: %s", strerror(-r)); |
| return r; |
| } |
| |
| ret = strappend("/dev/mapper/", id); |
| if (!ret) |
| return log_oom(); |
| |
| *device = ret; |
| return 0; |
| } |
| |
| static int add_mount( |
| const char *id, |
| const char *what, |
| const char *where, |
| const char *fstype, |
| bool rw, |
| const char *description, |
| const char *post) { |
| |
| _cleanup_free_ char *unit = NULL, *lnk = NULL, *crypto_what = NULL, *p = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| int r; |
| |
| assert(id); |
| assert(what); |
| assert(where); |
| assert(description); |
| |
| log_debug("Adding %s: %s %s", where, what, strna(fstype)); |
| |
| if (streq_ptr(fstype, "crypto_LUKS")) { |
| |
| r = add_cryptsetup(id, what, rw, &crypto_what); |
| if (r < 0) |
| return r; |
| |
| what = crypto_what; |
| fstype = NULL; |
| } |
| |
| unit = unit_name_from_path(where, ".mount"); |
| if (!unit) |
| return log_oom(); |
| |
| p = strjoin(arg_dest, "/", unit, NULL); |
| if (!p) |
| return log_oom(); |
| |
| f = fopen(p, "wxe"); |
| if (!f) { |
| log_error("Failed to create unit file %s: %m", unit); |
| return -errno; |
| } |
| |
| fprintf(f, |
| "# Automatically generated by systemd-gpt-auto-generator\n\n" |
| "[Unit]\n" |
| "Description=%s\n" |
| "Documentation=man:systemd-gpt-auto-generator(8)\n", |
| description); |
| |
| if (post) |
| fprintf(f, "Before=%s\n", post); |
| |
| r = generator_write_fsck_deps(f, arg_dest, what, where, fstype); |
| if (r < 0) |
| return r; |
| |
| fprintf(f, |
| "\n" |
| "[Mount]\n" |
| "What=%s\n" |
| "Where=%s\n", |
| what, where); |
| |
| if (fstype) |
| fprintf(f, "Type=%s\n", fstype); |
| |
| fprintf(f, "Options=%s\n", rw ? "rw" : "ro"); |
| |
| fflush(f); |
| if (ferror(f)) { |
| log_error("Failed to write unit file %s: %m", p); |
| return -errno; |
| } |
| |
| if (post) { |
| lnk = strjoin(arg_dest, "/", post, ".requires/", unit, NULL); |
| if (!lnk) |
| return log_oom(); |
| |
| mkdir_parents_label(lnk, 0755); |
| if (symlink(p, lnk) < 0) { |
| log_error("Failed to create symlink %s: %m", lnk); |
| return -errno; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int probe_and_add_mount( |
| const char *id, |
| const char *what, |
| const char *where, |
| bool rw, |
| const char *description, |
| const char *post) { |
| |
| _cleanup_blkid_free_probe_ blkid_probe b = NULL; |
| const char *fstype; |
| int r; |
| |
| assert(id); |
| assert(what); |
| assert(where); |
| assert(description); |
| |
| if (path_is_mount_point(where, true) <= 0 && |
| dir_is_empty(where) <= 0) { |
| log_debug("%s already populated, ignoring.", where); |
| return 0; |
| } |
| |
| /* Let's check the partition type here, so that we know |
| * whether to do LUKS magic. */ |
| |
| errno = 0; |
| b = blkid_new_probe_from_filename(what); |
| if (!b) { |
| if (errno == 0) |
| return log_oom(); |
| log_error("Failed to allocate prober: %m"); |
| return -errno; |
| } |
| |
| blkid_probe_enable_superblocks(b, 1); |
| blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); |
| |
| errno = 0; |
| r = blkid_do_safeprobe(b); |
| if (r == -2 || r == 1) /* no result or uncertain */ |
| return 0; |
| else if (r != 0) { |
| if (errno == 0) |
| errno = EIO; |
| log_error("Failed to probe %s: %m", what); |
| return -errno; |
| } |
| |
| blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); |
| |
| return add_mount( |
| id, |
| what, |
| where, |
| fstype, |
| rw, |
| description, |
| post); |
| } |
| |
| static int enumerate_partitions(dev_t devnum) { |
| |
| _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; |
| _cleanup_udev_device_unref_ struct udev_device *d = NULL; |
| _cleanup_blkid_free_probe_ blkid_probe b = NULL; |
| _cleanup_udev_unref_ struct udev *udev = NULL; |
| _cleanup_free_ char *home = NULL, *srv = NULL; |
| struct udev_list_entry *first, *item; |
| struct udev_device *parent = NULL; |
| const char *node, *pttype, *devtype; |
| int home_nr = -1, srv_nr = -1; |
| bool home_rw = true, srv_rw = true; |
| blkid_partlist pl; |
| int r, k; |
| dev_t pn; |
| |
| udev = udev_new(); |
| if (!udev) |
| return log_oom(); |
| |
| d = udev_device_new_from_devnum(udev, 'b', devnum); |
| if (!d) |
| return log_oom(); |
| |
| parent = udev_device_get_parent(d); |
| if (!parent) { |
| log_debug("Not a partitioned device, ignoring."); |
| return 0; |
| } |
| |
| /* Does it have a devtype? */ |
| devtype = udev_device_get_devtype(parent); |
| if (!devtype) { |
| log_debug("Parent doesn't have a device type, ignoring."); |
| return 0; |
| } |
| |
| /* Is this a disk or a partition? We only care for disks... */ |
| if (!streq(devtype, "disk")) { |
| log_debug("Parent isn't a raw disk, ignoring."); |
| return 0; |
| } |
| |
| /* Does it have a device node? */ |
| node = udev_device_get_devnode(parent); |
| if (!node) { |
| log_debug("Parent device does not have device node, ignoring."); |
| return 0; |
| } |
| |
| log_debug("Root device %s.", node); |
| |
| pn = udev_device_get_devnum(parent); |
| if (major(pn) == 0) |
| return 0; |
| |
| errno = 0; |
| b = blkid_new_probe_from_filename(node); |
| if (!b) { |
| if (errno == 0) |
| return log_oom(); |
| |
| log_error("Failed allocate prober: %m"); |
| return -errno; |
| } |
| |
| blkid_probe_enable_partitions(b, 1); |
| blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); |
| |
| errno = 0; |
| r = blkid_do_safeprobe(b); |
| if (r == -2 || r == 1) /* no result or uncertain */ |
| return 0; |
| else if (r != 0) { |
| if (errno == 0) |
| errno = EIO; |
| log_error("Failed to probe %s: %m", node); |
| return -errno; |
| } |
| |
| errno = 0; |
| r = blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); |
| if (r != 0) { |
| if (errno == 0) |
| errno = EIO; |
| log_error("Failed to determine partition table type of %s: %m", node); |
| return -errno; |
| } |
| |
| /* We only do this all for GPT... */ |
| if (!streq_ptr(pttype, "gpt")) { |
| log_debug("Not a GPT partition table, ignoring."); |
| return 0; |
| } |
| |
| errno = 0; |
| pl = blkid_probe_get_partitions(b); |
| if (!pl) { |
| if (errno == 0) |
| return log_oom(); |
| |
| log_error("Failed to list partitions of %s: %m", node); |
| return -errno; |
| } |
| |
| e = udev_enumerate_new(udev); |
| if (!e) |
| return log_oom(); |
| |
| r = udev_enumerate_add_match_parent(e, parent); |
| if (r < 0) |
| return log_oom(); |
| |
| r = udev_enumerate_add_match_subsystem(e, "block"); |
| if (r < 0) |
| return log_oom(); |
| |
| r = udev_enumerate_scan_devices(e); |
| if (r < 0) { |
| log_error("Failed to enumerate partitions on %s: %s", node, strerror(-r)); |
| return r; |
| } |
| |
| first = udev_enumerate_get_list_entry(e); |
| udev_list_entry_foreach(item, first) { |
| _cleanup_udev_device_unref_ struct udev_device *q; |
| const char *stype, *subnode; |
| sd_id128_t type_id; |
| blkid_partition pp; |
| dev_t qn; |
| int nr; |
| unsigned long long flags; |
| |
| q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); |
| if (!q) |
| continue; |
| |
| qn = udev_device_get_devnum(q); |
| if (major(qn) == 0) |
| continue; |
| |
| if (qn == devnum) |
| continue; |
| |
| if (qn == pn) |
| continue; |
| |
| subnode = udev_device_get_devnode(q); |
| if (!subnode) |
| continue; |
| |
| pp = blkid_partlist_devno_to_partition(pl, qn); |
| if (!pp) |
| continue; |
| |
| flags = blkid_partition_get_flags(pp); |
| |
| /* Ignore partitions that are not marked for automatic |
| * mounting on discovery */ |
| if (flags & GPT_FLAG_NO_AUTO) |
| continue; |
| |
| nr = blkid_partition_get_partno(pp); |
| if (nr < 0) |
| continue; |
| |
| stype = blkid_partition_get_type_string(pp); |
| if (!stype) |
| continue; |
| |
| if (sd_id128_from_string(stype, &type_id) < 0) |
| continue; |
| |
| if (sd_id128_equal(type_id, GPT_SWAP)) { |
| |
| if (flags & GPT_FLAG_READ_ONLY) { |
| log_debug("%s marked as read-only swap partition, which is bogus, ignoring.", subnode); |
| continue; |
| } |
| |
| k = add_swap(subnode); |
| if (k < 0) |
| r = k; |
| |
| } else if (sd_id128_equal(type_id, GPT_HOME)) { |
| |
| /* We only care for the first /home partition */ |
| if (home && nr >= home_nr) |
| continue; |
| |
| home_nr = nr; |
| home_rw = !(flags & GPT_FLAG_READ_ONLY), |
| |
| free(home); |
| home = strdup(subnode); |
| if (!home) |
| return log_oom(); |
| |
| } else if (sd_id128_equal(type_id, GPT_SRV)) { |
| |
| /* We only care for the first /srv partition */ |
| if (srv && nr >= srv_nr) |
| continue; |
| |
| srv_nr = nr; |
| srv_rw = !(flags & GPT_FLAG_READ_ONLY), |
| |
| free(srv); |
| srv = strdup(node); |
| if (!srv) |
| return log_oom(); |
| } |
| } |
| |
| if (home) { |
| k = probe_and_add_mount("home", home, "/home", home_rw, "Home Partition", SPECIAL_LOCAL_FS_TARGET); |
| if (k < 0) |
| r = k; |
| } |
| |
| if (srv) { |
| k = probe_and_add_mount("srv", srv, "/srv", srv_rw, "Server Data Partition", SPECIAL_LOCAL_FS_TARGET); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r; |
| } |
| |
| static int get_btrfs_block_device(const char *path, dev_t *dev) { |
| struct btrfs_ioctl_fs_info_args fsi = {}; |
| _cleanup_close_ int fd = -1; |
| uint64_t id; |
| |
| assert(path); |
| assert(dev); |
| |
| fd = open(path, O_DIRECTORY|O_CLOEXEC); |
| if (fd < 0) |
| return -errno; |
| |
| if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0) |
| return -errno; |
| |
| /* We won't do this for btrfs RAID */ |
| if (fsi.num_devices != 1) |
| return 0; |
| |
| for (id = 1; id <= fsi.max_id; id++) { |
| struct btrfs_ioctl_dev_info_args di = { |
| .devid = id, |
| }; |
| struct stat st; |
| |
| if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) { |
| if (errno == ENODEV) |
| continue; |
| |
| return -errno; |
| } |
| |
| if (stat((char*) di.path, &st) < 0) |
| return -errno; |
| |
| if (!S_ISBLK(st.st_mode)) |
| return -ENODEV; |
| |
| if (major(st.st_rdev) == 0) |
| return -ENODEV; |
| |
| *dev = st.st_rdev; |
| return 1; |
| } |
| |
| return -ENODEV; |
| } |
| |
| static int get_block_device(const char *path, dev_t *dev) { |
| struct stat st; |
| struct statfs sfs; |
| |
| assert(path); |
| assert(dev); |
| |
| if (lstat(path, &st)) |
| return -errno; |
| |
| if (major(st.st_dev) != 0) { |
| *dev = st.st_dev; |
| return 1; |
| } |
| |
| if (statfs(path, &sfs) < 0) |
| return -errno; |
| |
| if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC)) |
| return get_btrfs_block_device(path, dev); |
| |
| return 0; |
| } |
| |
| static int parse_proc_cmdline_item(const char *key, const char *value) { |
| int r; |
| |
| assert(key); |
| |
| if (STR_IN_SET(key, "systemd.gpt_auto", "rd.systemd.gpt_auto") && value) { |
| |
| r = parse_boolean(value); |
| if (r < 0) |
| log_warning("Failed to parse gpt-auto switch %s. Ignoring.", value); |
| |
| arg_enabled = r; |
| |
| } else if (streq(key, "root") && value) { |
| |
| /* Disable root disk logic if there's a root= value |
| * specified (unless it happens to be "gpt-auto") */ |
| |
| arg_root_enabled = streq(value, "gpt-auto"); |
| |
| } else if (streq(key, "rw") && !value) |
| arg_root_rw = true; |
| else if (streq(key, "ro") && !value) |
| arg_root_rw = false; |
| else if (startswith(key, "systemd.gpt-auto.") || startswith(key, "rd.systemd.gpt-auto.")) |
| log_warning("Unknown kernel switch %s. Ignoring.", key); |
| |
| return 0; |
| } |
| |
| static int add_root_mount(void) { |
| |
| #ifdef ENABLE_EFI |
| int r; |
| |
| if (!is_efi_boot()) { |
| log_debug("Not a EFI boot, not creating root mount."); |
| return 0; |
| } |
| |
| r = efi_loader_get_device_part_uuid(NULL); |
| if (r == -ENOENT) { |
| log_debug("EFI loader partition unknown, exiting."); |
| return 0; |
| } else if (r < 0) { |
| log_error("Failed to read ESP partition UUID: %s", strerror(-r)); |
| return r; |
| } |
| |
| /* OK, we have an ESP partition, this is fantastic, so let's |
| * wait for a root device to show up. A udev rule will create |
| * the link for us under the right name. */ |
| |
| return add_mount( |
| "root", |
| "/dev/gpt-auto-root", |
| in_initrd() ? "/sysroot" : "/", |
| NULL, |
| arg_root_rw, |
| "Root Partition", |
| in_initrd() ? SPECIAL_INITRD_ROOT_FS_TARGET : SPECIAL_LOCAL_FS_TARGET); |
| #else |
| return 0; |
| #endif |
| } |
| |
| static int add_mounts(void) { |
| dev_t devno; |
| int r; |
| |
| r = get_block_device("/", &devno); |
| if (r < 0) { |
| log_error("Failed to determine block device of root file system: %s", strerror(-r)); |
| return r; |
| } else if (r == 0) { |
| log_debug("Root file system not on a (single) block device."); |
| return 0; |
| } |
| |
| return enumerate_partitions(devno); |
| } |
| |
| int main(int argc, char *argv[]) { |
| int r = 0; |
| |
| if (argc > 1 && argc != 4) { |
| log_error("This program takes three or no arguments."); |
| return EXIT_FAILURE; |
| } |
| |
| if (argc > 1) |
| arg_dest = argv[3]; |
| |
| log_set_target(LOG_TARGET_SAFE); |
| log_parse_environment(); |
| log_open(); |
| |
| umask(0022); |
| |
| if (detect_container(NULL) > 0) { |
| log_debug("In a container, exiting."); |
| return EXIT_SUCCESS; |
| } |
| |
| if (parse_proc_cmdline(parse_proc_cmdline_item) < 0) |
| return EXIT_FAILURE; |
| |
| if (!arg_enabled) { |
| log_debug("Disabled, exiting."); |
| return EXIT_SUCCESS; |
| } |
| |
| if (arg_root_enabled) |
| r = add_root_mount(); |
| |
| if (!in_initrd()) { |
| int k; |
| |
| k = add_mounts(); |
| if (k < 0) |
| r = k; |
| } |
| |
| return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
| } |