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-rw-r--r--src/systemd-gpt-auto-generator/gpt-auto-generator.c1036
1 files changed, 1036 insertions, 0 deletions
diff --git a/src/systemd-gpt-auto-generator/gpt-auto-generator.c b/src/systemd-gpt-auto-generator/gpt-auto-generator.c
new file mode 100644
index 0000000000..a8149b8756
--- /dev/null
+++ b/src/systemd-gpt-auto-generator/gpt-auto-generator.c
@@ -0,0 +1,1036 @@
+/***
+ 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 <blkid/blkid.h>
+#include <stdlib.h>
+#include <sys/statfs.h>
+#include <unistd.h>
+
+#include "libudev.h"
+#include <systemd/sd-id128.h>
+
+#include "alloc-util.h"
+#include "blkid-util.h"
+#include "btrfs-util.h"
+#include "dirent-util.h"
+#include "efivars.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fstab-util.h"
+#include "generator.h"
+#include "gpt.h"
+#include "missing.h"
+#include "mkdir.h"
+#include "mount-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "proc-cmdline.h"
+#include "special.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "udev-util.h"
+#include "unit-name.h"
+#include "util.h"
+#include "virt.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_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);
+
+ r = unit_name_from_path(what, ".device", &d);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ e = unit_name_escape(id);
+ if (!e)
+ return log_oom();
+
+ r = unit_name_build("systemd-cryptsetup", e, ".service", &n);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ p = strjoin(arg_dest, "/", n, NULL);
+ if (!p)
+ return log_oom();
+
+ f = fopen(p, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m", p);
+
+ 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"
+ "[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);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write file %s: %m", p);
+
+ from = strjoina("../", n);
+
+ to = strjoin(arg_dest, "/", d, ".wants/", n, NULL);
+ if (!to)
+ return log_oom();
+
+ mkdir_parents_label(to, 0755);
+ if (symlink(from, to) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", to);
+
+ 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)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", to);
+
+ 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)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", to);
+
+ 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",
+ WRITE_STRING_FILE_CREATE); /* the binary handles timeouts anyway */
+ if (r < 0)
+ return log_error_errno(r, "Failed to write device drop-in: %m");
+
+ 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 *options,
+ 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;
+ }
+
+ r = unit_name_from_path(where, ".mount", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ p = strjoin(arg_dest, "/", unit, NULL);
+ if (!p)
+ return log_oom();
+
+ f = fopen(p, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
+
+ 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);
+
+ if (options)
+ fprintf(f, "Options=%s,%s\n", options, rw ? "rw" : "ro");
+ else
+ fprintf(f, "Options=%s\n", rw ? "rw" : "ro");
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", p);
+
+ 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)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+ }
+
+ return 0;
+}
+
+static bool path_is_busy(const char *where) {
+ int r;
+
+ /* already a mountpoint; generators run during reload */
+ r = path_is_mount_point(where, AT_SYMLINK_FOLLOW);
+ if (r > 0)
+ return false;
+
+ /* the directory might not exist on a stateless system */
+ if (r == -ENOENT)
+ return false;
+
+ if (r < 0)
+ return true;
+
+ /* not a mountpoint but it contains files */
+ if (dir_is_empty(where) <= 0)
+ return true;
+
+ return false;
+}
+
+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 = NULL;
+ int r;
+
+ assert(id);
+ assert(what);
+ assert(where);
+ assert(description);
+
+ if (path_is_busy(where)) {
+ 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();
+ return log_error_errno(errno, "Failed to allocate prober: %m");
+ }
+
+ 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)
+ return log_error_errno(errno ?: EIO, "Failed to probe %s: %m", what);
+
+ /* add_mount is OK with fstype being NULL. */
+ (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
+
+ return add_mount(
+ id,
+ what,
+ where,
+ fstype,
+ rw,
+ NULL,
+ description,
+ post);
+}
+
+static int add_swap(const char *path) {
+ _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ assert(path);
+
+ log_debug("Adding swap: %s", path);
+
+ r = unit_name_from_path(path, ".swap", &name);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ unit = strjoin(arg_dest, "/", name, NULL);
+ if (!unit)
+ return log_oom();
+
+ f = fopen(unit, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
+
+ 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);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", unit);
+
+ 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)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+
+ return 0;
+}
+
+#ifdef ENABLE_EFI
+static int add_automount(
+ const char *id,
+ const char *what,
+ const char *where,
+ const char *fstype,
+ bool rw,
+ const char *options,
+ const char *description,
+ usec_t timeout) {
+
+ _cleanup_free_ char *unit = NULL, *lnk = NULL;
+ _cleanup_free_ char *opt, *p = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ assert(id);
+ assert(where);
+ assert(description);
+
+ if (options)
+ opt = strjoin(options, ",noauto", NULL);
+ else
+ opt = strdup("noauto");
+ if (!opt)
+ return log_oom();
+
+ r = add_mount(id,
+ what,
+ where,
+ fstype,
+ rw,
+ opt,
+ description,
+ NULL);
+ if (r < 0)
+ return r;
+
+ r = unit_name_from_path(where, ".automount", &unit);
+ if (r < 0)
+ return log_error_errno(r, "Failed to generate unit name: %m");
+
+ p = strjoin(arg_dest, "/", unit, NULL);
+ if (!p)
+ return log_oom();
+
+ f = fopen(p, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
+
+ fprintf(f,
+ "# Automatically generated by systemd-gpt-auto-generator\n\n"
+ "[Unit]\n"
+ "Description=%s\n"
+ "Documentation=man:systemd-gpt-auto-generator(8)\n"
+ "[Automount]\n"
+ "Where=%s\n"
+ "TimeoutIdleSec=%lld\n",
+ description,
+ where,
+ (unsigned long long)timeout / USEC_PER_SEC);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write unit file %s: %m", p);
+
+ lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".wants/", unit, NULL);
+ if (!lnk)
+ return log_oom();
+ mkdir_parents_label(lnk, 0755);
+
+ if (symlink(p, lnk) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+
+ return 0;
+}
+
+static int add_boot(const char *what) {
+ _cleanup_blkid_free_probe_ blkid_probe b = NULL;
+ const char *fstype = NULL, *uuid = NULL;
+ sd_id128_t id, type_id;
+ int r;
+
+ assert(what);
+
+ if (!is_efi_boot()) {
+ log_debug("Not an EFI boot, ignoring /boot.");
+ return 0;
+ }
+
+ if (in_initrd()) {
+ log_debug("In initrd, ignoring /boot.");
+ return 0;
+ }
+
+ if (detect_container() > 0) {
+ log_debug("In a container, ignoring /boot.");
+ return 0;
+ }
+
+ /* We create an .automount which is not overridden by the .mount from the fstab generator. */
+ if (fstab_is_mount_point("/boot")) {
+ log_debug("/boot specified in fstab, ignoring.");
+ return 0;
+ }
+
+ if (path_is_busy("/boot")) {
+ log_debug("/boot already populated, ignoring.");
+ return 0;
+ }
+
+ r = efi_loader_get_device_part_uuid(&id);
+ if (r == -ENOENT) {
+ log_debug("EFI loader partition unknown.");
+ return 0;
+ }
+
+ if (r < 0) {
+ log_error_errno(r, "Failed to read ESP partition UUID: %m");
+ return r;
+ }
+
+ errno = 0;
+ b = blkid_new_probe_from_filename(what);
+ if (!b) {
+ if (errno == 0)
+ return log_oom();
+ return log_error_errno(errno, "Failed to allocate prober: %m");
+ }
+
+ 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)
+ return log_error_errno(errno ?: EIO, "Failed to probe %s: %m", what);
+
+ (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
+ if (!streq_ptr(fstype, "vfat")) {
+ log_debug("Partition for /boot is not a FAT filesystem, ignoring.");
+ return 0;
+ }
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "PART_ENTRY_UUID", &uuid, NULL);
+ if (r != 0) {
+ log_debug_errno(errno, "Partition for /boot does not have a UUID, ignoring.");
+ return 0;
+ }
+
+ if (sd_id128_from_string(uuid, &type_id) < 0) {
+ log_debug("Partition for /boot does not have a valid UUID, ignoring.");
+ return 0;
+ }
+
+ if (!sd_id128_equal(type_id, id)) {
+ log_debug("Partition for /boot does not appear to be the partition we are booted from.");
+ return 0;
+ }
+
+ r = add_automount("boot",
+ what,
+ "/boot",
+ "vfat",
+ true,
+ "umask=0077",
+ "EFI System Partition Automount",
+ 120 * USEC_PER_SEC);
+
+ return r;
+}
+#else
+static int add_boot(const char *what) {
+ return 0;
+}
+#endif
+
+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 *boot = NULL, *home = NULL, *srv = NULL;
+ struct udev_list_entry *first, *item;
+ struct udev_device *parent = NULL;
+ const char *name, *node, *pttype, *devtype;
+ int boot_nr = -1, 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();
+
+ name = udev_device_get_devnode(d);
+ if (!name)
+ name = udev_device_get_syspath(d);
+ if (!name) {
+ log_debug("Device %u:%u does not have a name, ignoring.",
+ major(devnum), minor(devnum));
+ return 0;
+ }
+
+ parent = udev_device_get_parent(d);
+ if (!parent) {
+ log_debug("%s: not a partitioned device, ignoring.", name);
+ return 0;
+ }
+
+ /* Does it have a devtype? */
+ devtype = udev_device_get_devtype(parent);
+ if (!devtype) {
+ log_debug("%s: parent doesn't have a device type, ignoring.", name);
+ return 0;
+ }
+
+ /* Is this a disk or a partition? We only care for disks... */
+ if (!streq(devtype, "disk")) {
+ log_debug("%s: parent isn't a raw disk, ignoring.", name);
+ return 0;
+ }
+
+ /* Does it have a device node? */
+ node = udev_device_get_devnode(parent);
+ if (!node) {
+ log_debug("%s: parent device does not have device node, ignoring.", name);
+ return 0;
+ }
+
+ log_debug("%s: root device %s.", name, 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();
+
+ return log_error_errno(errno, "%s: failed to allocate prober: %m", node);
+ }
+
+ 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 == 1)
+ return 0; /* no results */
+ else if (r == -2) {
+ log_warning("%s: probe gave ambiguous results, ignoring.", node);
+ return 0;
+ } else if (r != 0)
+ return log_error_errno(errno ?: EIO, "%s: failed to probe: %m", node);
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
+ if (r != 0) {
+ if (errno == 0)
+ return 0; /* No partition table found. */
+
+ return log_error_errno(errno, "%s: failed to determine partition table type: %m", node);
+ }
+
+ /* We only do this all for GPT... */
+ if (!streq_ptr(pttype, "gpt")) {
+ log_debug("%s: not a GPT partition table, ignoring.", node);
+ return 0;
+ }
+
+ errno = 0;
+ pl = blkid_probe_get_partitions(b);
+ if (!pl) {
+ if (errno == 0)
+ return log_oom();
+
+ return log_error_errno(errno, "%s: failed to list partitions: %m", node);
+ }
+
+ 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)
+ return log_error_errno(r, "%s: failed to enumerate partitions: %m", node);
+
+ first = udev_enumerate_get_list_entry(e);
+ udev_list_entry_foreach(item, first) {
+ _cleanup_udev_device_unref_ struct udev_device *q;
+ unsigned long long flags;
+ const char *stype, *subnode;
+ sd_id128_t type_id;
+ blkid_partition pp;
+ dev_t qn;
+ int nr;
+
+ 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;
+
+ 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;
+
+ flags = blkid_partition_get_flags(pp);
+
+ if (sd_id128_equal(type_id, GPT_SWAP)) {
+
+ if (flags & GPT_FLAG_NO_AUTO)
+ continue;
+
+ 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_ESP)) {
+
+ /* We only care for the first /boot partition */
+ if (boot && nr >= boot_nr)
+ continue;
+
+ /* Note that we do not honour the "no-auto"
+ * flag for the ESP, as it is often unset, to
+ * hide it from Windows. */
+
+ boot_nr = nr;
+
+ r = free_and_strdup(&boot, subnode);
+ if (r < 0)
+ return log_oom();
+
+ } else if (sd_id128_equal(type_id, GPT_HOME)) {
+
+ if (flags & GPT_FLAG_NO_AUTO)
+ continue;
+
+ /* We only care for the first /home partition */
+ if (home && nr >= home_nr)
+ continue;
+
+ home_nr = nr;
+ home_rw = !(flags & GPT_FLAG_READ_ONLY),
+
+ r = free_and_strdup(&home, subnode);
+ if (r < 0)
+ return log_oom();
+
+ } else if (sd_id128_equal(type_id, GPT_SRV)) {
+
+ if (flags & GPT_FLAG_NO_AUTO)
+ continue;
+
+ /* We only care for the first /srv partition */
+ if (srv && nr >= srv_nr)
+ continue;
+
+ srv_nr = nr;
+ srv_rw = !(flags & GPT_FLAG_READ_ONLY),
+
+ r = free_and_strdup(&srv, subnode);
+ if (r < 0)
+ return log_oom();
+ }
+ }
+
+ if (boot) {
+ k = add_boot(boot);
+ if (k < 0)
+ r = k;
+ }
+
+ 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_block_device(const char *path, dev_t *dev) {
+ struct stat st;
+ struct statfs sfs;
+
+ assert(path);
+ assert(dev);
+
+ /* Get's the block device directly backing a file system. If
+ * the block device is encrypted, returns the device mapper
+ * block device. */
+
+ 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 btrfs_get_block_device(path, dev);
+
+ return 0;
+}
+
+static int get_block_device_harder(const char *path, dev_t *dev) {
+ _cleanup_closedir_ DIR *d = NULL;
+ _cleanup_free_ char *p = NULL, *t = NULL;
+ struct dirent *de, *found = NULL;
+ const char *q;
+ unsigned maj, min;
+ dev_t dt;
+ int r;
+
+ assert(path);
+ assert(dev);
+
+ /* Gets the backing block device for a file system, and
+ * handles LUKS encrypted file systems, looking for its
+ * immediate parent, if there is one. */
+
+ r = get_block_device(path, &dt);
+ if (r <= 0)
+ return r;
+
+ if (asprintf(&p, "/sys/dev/block/%u:%u/slaves", major(dt), minor(dt)) < 0)
+ return -ENOMEM;
+
+ d = opendir(p);
+ if (!d) {
+ if (errno == ENOENT)
+ goto fallback;
+
+ return -errno;
+ }
+
+ FOREACH_DIRENT_ALL(de, d, return -errno) {
+
+ if (STR_IN_SET(de->d_name, ".", ".."))
+ continue;
+
+ if (!IN_SET(de->d_type, DT_LNK, DT_UNKNOWN))
+ continue;
+
+ if (found) /* Don't try to support multiple backing block devices */
+ goto fallback;
+
+ found = de;
+ }
+
+ if (!found)
+ goto fallback;
+
+ q = strjoina(p, "/", found->d_name, "/dev");
+
+ r = read_one_line_file(q, &t);
+ if (r == -ENOENT)
+ goto fallback;
+ if (r < 0)
+ return r;
+
+ if (sscanf(t, "%u:%u", &maj, &min) != 2)
+ return -EINVAL;
+
+ if (maj == 0)
+ goto fallback;
+
+ *dev = makedev(maj, min);
+ return 1;
+
+fallback:
+ *dev = dt;
+ return 1;
+}
+
+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);
+ else
+ 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;
+
+ 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)
+ return log_error_errno(r, "Failed to read ESP partition UUID: %m");
+
+ /* 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,
+ NULL,
+ "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_harder("/", &devno);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine block device of root file system: %m");
+ else if (r == 0) {
+ r = get_block_device_harder("/usr", &devno);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine block device of /usr file system: %m");
+ else if (r == 0) {
+ log_debug("Neither root nor /usr file system are 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() > 0) {
+ log_debug("In a container, exiting.");
+ return EXIT_SUCCESS;
+ }
+
+ r = parse_proc_cmdline(parse_proc_cmdline_item);
+ if (r < 0)
+ log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
+
+ 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;
+}