510 lines
15 KiB
C
510 lines
15 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/statfs.h>
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#include <blkid/blkid.h>
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#ifdef HAVE_LINUX_BTRFS_H
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#include <linux/btrfs.h>
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#endif
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#include "path-util.h"
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#include "util.h"
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#include "mkdir.h"
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#include "missing.h"
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#include "sd-id128.h"
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#include "libudev.h"
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#include "udev-util.h"
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#include "special.h"
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#include "unit-name.h"
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#include "virt.h"
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#include "generator.h"
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#include "gpt.h"
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static const char *arg_dest = "/tmp";
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DEFINE_TRIVIAL_CLEANUP_FUNC(blkid_probe, blkid_free_probe);
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#define _cleanup_blkid_freep_probe_ _cleanup_(blkid_free_probep)
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static int verify_gpt_partition(const char *node, sd_id128_t *type, unsigned *nr, char **fstype) {
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_cleanup_blkid_freep_probe_ blkid_probe b = NULL;
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const char *v;
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int r;
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errno = 0;
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b = blkid_new_probe_from_filename(node);
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if (!b)
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return errno != 0 ? -errno : -ENOMEM;
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blkid_probe_enable_superblocks(b, 1);
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blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
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blkid_probe_enable_partitions(b, 1);
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blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
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errno = 0;
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r = blkid_do_safeprobe(b);
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if (r == -2 || r == 1) /* no result or uncertain */
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return -EBADSLT;
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else if (r != 0)
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return errno ? -errno : -EIO;
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errno = 0;
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r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL);
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if (r != 0)
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/* return 0 if we're not on GPT */
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return errno ? -errno : 0;
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if (strcmp(v, "gpt") != 0)
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return 0;
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if (type) {
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errno = 0;
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r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL);
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if (r != 0)
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return errno ? -errno : -EIO;
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r = sd_id128_from_string(v, type);
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if (r < 0)
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return r;
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}
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if (nr) {
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errno = 0;
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r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL);
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if (r != 0)
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return errno ? -errno : -EIO;
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r = safe_atou(v, nr);
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if (r < 0)
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return r;
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}
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if (fstype) {
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errno = 0;
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r = blkid_probe_lookup_value(b, "TYPE", &v, NULL);
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if (r != 0)
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*fstype = NULL;
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else {
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char *fst;
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fst = strdup(v);
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if (!fst)
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return -ENOMEM;
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*fstype = fst;
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}
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}
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return 1;
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}
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static int add_swap(const char *path, const char *fstype) {
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_cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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log_debug("Adding swap: %s %s", path, fstype);
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name = unit_name_from_path(path, ".swap");
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if (!name)
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return log_oom();
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unit = strjoin(arg_dest, "/", name, NULL);
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if (!unit)
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return log_oom();
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f = fopen(unit, "wxe");
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if (!f) {
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log_error("Failed to create unit file %s: %m", unit);
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return -errno;
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}
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fprintf(f,
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"# Automatically generated by systemd-gpt-auto-generator\n\n"
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"[Swap]\n"
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"What=%s\n",
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path);
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fflush(f);
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if (ferror(f)) {
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log_error("Failed to write unit file %s: %m", unit);
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return -errno;
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}
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lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
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if (!lnk)
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return log_oom();
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mkdir_parents_label(lnk, 0755);
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if (symlink(unit, lnk) < 0) {
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log_error("Failed to create symlink %s: %m", lnk);
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return -errno;
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}
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return 0;
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}
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static int add_mount(const char *what, const char *where, const char *fstype, const char *description) {
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_cleanup_free_ char *unit = NULL, *lnk = NULL, *p = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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if (dir_is_empty(where) <= 0) {
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log_debug("%s already populated, ignoring.", where);
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return 0;
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}
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log_debug("Adding %s: %s %s", where, what, fstype);
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unit = unit_name_from_path(where, ".mount");
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if (!unit)
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return log_oom();
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p = strjoin(arg_dest, "/", unit, NULL);
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if (!p)
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return log_oom();
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f = fopen(p, "wxe");
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if (!f) {
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log_error("Failed to create unit file %s: %m", unit);
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return -errno;
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}
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fprintf(f,
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"# Automatically generated by systemd-gpt-auto-generator\n\n"
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"[Unit]\n"
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"Description=%s\n",
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description);
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r = generator_write_fsck_deps(f, arg_dest, what, where, fstype);
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if (r < 0)
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return r;
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fprintf(f,
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"\n"
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"[Mount]\n"
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"What=%s\n"
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"Where=%s\n"
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"Type=%s\n",
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what, where, fstype);
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fflush(f);
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if (ferror(f)) {
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log_error("Failed to write unit file %s: %m", unit);
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return -errno;
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}
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lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".requires/", unit, NULL);
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if (!lnk)
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return log_oom();
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mkdir_parents_label(lnk, 0755);
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if (symlink(unit, lnk) < 0) {
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log_error("Failed to create symlink %s: %m", lnk);
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return -errno;
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}
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return 0;
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}
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static int enumerate_partitions(struct udev *udev, dev_t dev) {
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_cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
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_cleanup_udev_device_unref_ struct udev_device *d = NULL;
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_cleanup_free_ char *home = NULL, *home_fstype = NULL, *srv = NULL, *srv_fstype = NULL;
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unsigned home_nr = (unsigned) -1, srv_nr = (unsigned )-1;
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struct udev_list_entry *first, *item;
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struct udev_device *parent = NULL;
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int r;
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e = udev_enumerate_new(udev);
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if (!e)
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return log_oom();
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d = udev_device_new_from_devnum(udev, 'b', dev);
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if (!d)
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return log_oom();
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parent = udev_device_get_parent(d);
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if (!parent)
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return log_oom();
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r = udev_enumerate_add_match_parent(e, parent);
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if (r < 0)
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return log_oom();
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r = udev_enumerate_add_match_subsystem(e, "block");
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if (r < 0)
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return log_oom();
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r = udev_enumerate_scan_devices(e);
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if (r < 0) {
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log_error("Failed to enumerate partitions on /dev/block/%u:%u: %s", major(dev), minor(dev), strerror(-r));
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return r;
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}
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first = udev_enumerate_get_list_entry(e);
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udev_list_entry_foreach(item, first) {
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_cleanup_udev_device_unref_ struct udev_device *q;
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_cleanup_free_ char *fstype = NULL;
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const char *node = NULL;
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sd_id128_t type_id;
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unsigned nr;
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q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
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if (!q)
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return log_oom();
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if (udev_device_get_devnum(q) == udev_device_get_devnum(d))
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continue;
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if (udev_device_get_devnum(q) == udev_device_get_devnum(parent))
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continue;
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node = udev_device_get_devnode(q);
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if (!node)
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return log_oom();
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r = verify_gpt_partition(node, &type_id, &nr, &fstype);
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if (r < 0) {
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/* skip child devices which are not detected properly */
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if (r == -EBADSLT)
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continue;
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log_error("Failed to verify GPT partition %s: %s", node, strerror(-r));
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return r;
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}
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if (r == 0)
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continue;
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if (sd_id128_equal(type_id, GPT_SWAP))
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add_swap(node, fstype);
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else if (sd_id128_equal(type_id, GPT_HOME)) {
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/* We only care for the first /home partition */
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if (home && nr >= home_nr)
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continue;
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home_nr = nr;
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free(home);
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home = strdup(node);
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if (!home)
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return log_oom();
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free(home_fstype);
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home_fstype = fstype;
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fstype = NULL;
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} else if (sd_id128_equal(type_id, GPT_SRV)) {
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/* We only care for the first /srv partition */
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if (srv && nr >= srv_nr)
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continue;
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srv_nr = nr;
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free(srv);
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srv = strdup(node);
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if (!srv)
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return log_oom();
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free(srv_fstype);
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srv_fstype = fstype;
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fstype = NULL;
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}
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}
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if (home && home_fstype)
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add_mount(home, "/home", home_fstype, "Home Partition");
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if (srv && srv_fstype)
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add_mount(srv, "/srv", srv_fstype, "Server Data Partition");
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return r;
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}
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static int get_btrfs_block_device(const char *path, dev_t *dev) {
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struct btrfs_ioctl_fs_info_args fsi = {};
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_cleanup_close_ int fd = -1;
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uint64_t id;
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assert(path);
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assert(dev);
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fd = open(path, O_DIRECTORY|O_CLOEXEC);
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if (fd < 0)
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return -errno;
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if (ioctl(fd, BTRFS_IOC_FS_INFO, &fsi) < 0)
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return -errno;
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/* We won't do this for btrfs RAID */
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if (fsi.num_devices != 1)
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return 0;
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for (id = 1; id <= fsi.max_id; id++) {
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struct btrfs_ioctl_dev_info_args di = {
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.devid = id,
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};
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struct stat st;
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if (ioctl(fd, BTRFS_IOC_DEV_INFO, &di) < 0) {
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if (errno == ENODEV)
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continue;
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return -errno;
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}
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if (stat((char*) di.path, &st) < 0)
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return -errno;
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if (!S_ISBLK(st.st_mode))
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return -ENODEV;
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if (major(st.st_rdev) == 0)
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return -ENODEV;
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*dev = st.st_rdev;
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return 1;
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}
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return -ENODEV;
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}
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static int get_block_device(const char *path, dev_t *dev) {
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struct stat st;
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struct statfs sfs;
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assert(path);
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assert(dev);
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if (lstat(path, &st))
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return -errno;
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if (major(st.st_dev) != 0) {
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*dev = st.st_dev;
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return 1;
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}
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if (statfs(path, &sfs) < 0)
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return -errno;
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if (F_TYPE_EQUAL(sfs.f_type, BTRFS_SUPER_MAGIC))
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return get_btrfs_block_device(path, dev);
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return 0;
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}
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static int devno_to_devnode(struct udev *udev, dev_t devno, char **ret) {
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_cleanup_udev_device_unref_ struct udev_device *d;
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const char *t;
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char *n;
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d = udev_device_new_from_devnum(udev, 'b', devno);
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if (!d)
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return log_oom();
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t = udev_device_get_devnode(d);
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if (!t)
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return -ENODEV;
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n = strdup(t);
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if (!n)
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return -ENOMEM;
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*ret = n;
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return 0;
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}
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int main(int argc, char *argv[]) {
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_cleanup_udev_unref_ struct udev *udev = NULL;
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_cleanup_free_ char *node = NULL;
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dev_t devno;
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int r = 0;
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if (argc > 1 && argc != 4) {
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log_error("This program takes three or no arguments.");
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return EXIT_FAILURE;
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}
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if (argc > 1)
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arg_dest = argv[3];
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log_set_target(LOG_TARGET_SAFE);
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log_parse_environment();
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log_open();
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umask(0022);
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if (in_initrd()) {
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log_debug("In initrd, exiting.");
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return EXIT_SUCCESS;
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}
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if (detect_container(NULL) > 0) {
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log_debug("In a container, exiting.");
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return EXIT_SUCCESS;
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}
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r = get_block_device("/", &devno);
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if (r < 0) {
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log_error("Failed to determine block device of root file system: %s", strerror(-r));
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return EXIT_FAILURE;
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} else if (r == 0) {
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log_debug("Root file system not on a (single) block device.");
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return EXIT_SUCCESS;
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}
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udev = udev_new();
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if (!udev) {
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log_oom();
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return EXIT_FAILURE;
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}
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r = devno_to_devnode(udev, devno, &node);
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if (r < 0) {
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log_error("Failed to determine block device node from major/minor: %s", strerror(-r));
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return EXIT_FAILURE;
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}
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log_debug("Root device %s.", node);
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r = verify_gpt_partition(node, NULL, NULL, NULL);
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if (r < 0) {
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log_error("Failed to verify GPT partition %s: %s", node, strerror(-r));
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return EXIT_FAILURE;
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}
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if (r == 0) {
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log_debug("Not a GPT disk, exiting.");
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return EXIT_SUCCESS;
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}
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r = enumerate_partitions(udev, devno);
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if (r < 0)
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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