./tools/notsd-move

1 files changed, 1042 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..325b85b58e
--- /dev/null
+++ b/src/systemd-gpt-auto-generator/gpt-auto-generator.c
@@ -0,0 +1,1042 @@
+/***
+  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 "systemd-basic/alloc-util.h"
+#include "systemd-basic/btrfs-util.h"
+#include "systemd-basic/dirent-util.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/fileio.h"
+#include "systemd-basic/missing.h"
+#include "systemd-basic/mkdir.h"
+#include "systemd-basic/mount-util.h"
+#include "systemd-basic/parse-util.h"
+#include "systemd-basic/path-util.h"
+#include "systemd-basic/proc-cmdline.h"
+#include "systemd-basic/special.h"
+#include "systemd-basic/stat-util.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/unit-name.h"
+#include "systemd-basic/util.h"
+#include "systemd-basic/virt.h"
+#include "systemd-blkid/blkid-util.h"
+#include "systemd-shared/efivars.h"
+#include "systemd-shared/fstab-util.h"
+#include "systemd-shared/generator.h"
+#include "systemd-shared/gpt.h"
+#include "systemd-shared/udev-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_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) {
+        const char *esp;
+        int r;
+
+        assert(what);
+
+        if (in_initrd()) {
+                log_debug("In initrd, ignoring the ESP.");
+                return 0;
+        }
+
+        if (detect_container() > 0) {
+                log_debug("In a container, ignoring the ESP.");
+                return 0;
+        }
+
+        /* If /efi exists we'll use that. Otherwise we'll use /boot, as that's usually the better choice */
+        esp = access("/efi/", F_OK) >= 0 ? "/efi" : "/boot";
+
+        /* We create an .automount which is not overridden by the .mount from the fstab generator. */
+        if (fstab_is_mount_point(esp)) {
+                log_debug("%s specified in fstab, ignoring.", esp);
+                return 0;
+        }
+
+        if (path_is_busy(esp)) {
+                log_debug("%s already populated, ignoring.", esp);
+                return 0;
+        }
+
+        if (is_efi_boot()) {
+                _cleanup_blkid_free_probe_ blkid_probe b = NULL;
+                const char *fstype = NULL, *uuid_string = NULL;
+                sd_id128_t loader_uuid, part_uuid;
+
+                /* If this is an EFI boot, be extra careful, and only mount the ESP if it was the ESP used for booting. */
+
+                r = efi_loader_get_device_part_uuid(&loader_uuid);
+                if (r == -ENOENT) {
+                        log_debug("EFI loader partition unknown.");
+                        return 0;
+                }
+                if (r < 0)
+                        return log_error_errno(r, "Failed to read ESP partition UUID: %m");
+
+                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 %s is not a FAT filesystem, ignoring.", esp);
+                        return 0;
+                }
+
+                errno = 0;
+                r = blkid_probe_lookup_value(b, "PART_ENTRY_UUID", &uuid_string, NULL);
+                if (r != 0) {
+                        log_debug_errno(errno, "Partition for %s does not have a UUID, ignoring.", esp);
+                        return 0;
+                }
+
+                if (sd_id128_from_string(uuid_string, &part_uuid) < 0) {
+                        log_debug("Partition for %s does not have a valid UUID, ignoring.", esp);
+                        return 0;
+                }
+
+                if (!sd_id128_equal(part_uuid, loader_uuid)) {
+                        log_debug("Partition for %s does not appear to be the partition we are booted from.", esp);
+                        return 0;
+                }
+        } else
+                log_debug("Not an EFI boot, skipping ESP check.");
+
+        return add_automount("boot",
+                          what,
+                          esp,
+                          "vfat",
+                          true,
+                          "umask=0077",
+                          "EFI System Partition Automount",
+                          120 * USEC_PER_SEC);
+}
+#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, void *data) {
+        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. */
+
+        if (in_initrd()) {
+                r = generator_write_initrd_root_device_deps(arg_dest, "/dev/gpt-auto-root");
+                if (r < 0)
+                        return 0;
+        }
+
+        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, NULL, false);
+        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;
+}