1031 lines
31 KiB
C
1031 lines
31 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 <sys/statfs.h>
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#include <blkid/blkid.h>
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#include "libudev.h"
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#include "sd-id128.h"
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#include "blkid-util.h"
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#include "btrfs-util.h"
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#include "efivars.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fstab-util.h"
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#include "generator.h"
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#include "gpt.h"
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#include "missing.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "special.h"
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#include "string-util.h"
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#include "udev-util.h"
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#include "unit-name.h"
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#include "util.h"
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#include "virt.h"
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static const char *arg_dest = "/tmp";
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static bool arg_enabled = true;
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static bool arg_root_enabled = true;
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static bool arg_root_rw = false;
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static int add_cryptsetup(const char *id, const char *what, bool rw, char **device) {
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_cleanup_free_ char *e = NULL, *n = NULL, *p = NULL, *d = NULL, *to = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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char *from, *ret;
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int r;
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assert(id);
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assert(what);
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assert(device);
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r = unit_name_from_path(what, ".device", &d);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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e = unit_name_escape(id);
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if (!e)
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return log_oom();
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r = unit_name_build("systemd-cryptsetup", e, ".service", &n);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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p = strjoin(arg_dest, "/", n, 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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return log_error_errno(errno, "Failed to create unit file %s: %m", p);
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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=Cryptography Setup for %%I\n"
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"Documentation=man:systemd-gpt-auto-generator(8) man:systemd-cryptsetup@.service(8)\n"
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"DefaultDependencies=no\n"
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"Conflicts=umount.target\n"
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"BindsTo=dev-mapper-%%i.device %s\n"
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"Before=umount.target cryptsetup.target\n"
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"After=%s\n"
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"IgnoreOnIsolate=true\n"
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"[Service]\n"
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"Type=oneshot\n"
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"RemainAfterExit=yes\n"
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"TimeoutSec=0\n" /* the binary handles timeouts anyway */
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"ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '' '%s'\n"
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"ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
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d, d,
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id, what, rw ? "" : "read-only",
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id);
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r = fflush_and_check(f);
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if (r < 0)
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return log_error_errno(r, "Failed to write file %s: %m", p);
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from = strjoina("../", n);
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to = strjoin(arg_dest, "/", d, ".wants/", n, NULL);
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if (!to)
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return log_oom();
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mkdir_parents_label(to, 0755);
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if (symlink(from, to) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", to);
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free(to);
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to = strjoin(arg_dest, "/cryptsetup.target.requires/", n, NULL);
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if (!to)
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return log_oom();
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mkdir_parents_label(to, 0755);
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if (symlink(from, to) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", to);
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free(to);
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to = strjoin(arg_dest, "/dev-mapper-", e, ".device.requires/", n, NULL);
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if (!to)
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return log_oom();
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mkdir_parents_label(to, 0755);
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if (symlink(from, to) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", to);
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free(p);
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p = strjoin(arg_dest, "/dev-mapper-", e, ".device.d/50-job-timeout-sec-0.conf", NULL);
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if (!p)
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return log_oom();
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mkdir_parents_label(p, 0755);
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r = write_string_file(p,
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"# Automatically generated by systemd-gpt-auto-generator\n\n"
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"[Unit]\n"
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"JobTimeoutSec=0\n",
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WRITE_STRING_FILE_CREATE); /* the binary handles timeouts anyway */
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if (r < 0)
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return log_error_errno(r, "Failed to write device drop-in: %m");
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ret = strappend("/dev/mapper/", id);
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if (!ret)
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return log_oom();
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*device = ret;
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return 0;
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}
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static int add_mount(
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const char *id,
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const char *what,
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const char *where,
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const char *fstype,
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bool rw,
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const char *options,
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const char *description,
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const char *post) {
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_cleanup_free_ char *unit = NULL, *lnk = NULL, *crypto_what = NULL, *p = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(id);
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assert(what);
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assert(where);
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assert(description);
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log_debug("Adding %s: %s %s", where, what, strna(fstype));
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if (streq_ptr(fstype, "crypto_LUKS")) {
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r = add_cryptsetup(id, what, rw, &crypto_what);
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if (r < 0)
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return r;
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what = crypto_what;
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fstype = NULL;
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}
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r = unit_name_from_path(where, ".mount", &unit);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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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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return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
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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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"Documentation=man:systemd-gpt-auto-generator(8)\n",
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description);
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if (post)
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fprintf(f, "Before=%s\n", post);
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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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what, where);
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if (fstype)
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fprintf(f, "Type=%s\n", fstype);
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if (options)
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fprintf(f, "Options=%s,%s\n", options, rw ? "rw" : "ro");
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else
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fprintf(f, "Options=%s\n", rw ? "rw" : "ro");
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r = fflush_and_check(f);
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if (r < 0)
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return log_error_errno(r, "Failed to write unit file %s: %m", p);
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if (post) {
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lnk = strjoin(arg_dest, "/", post, ".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(p, lnk) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
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}
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return 0;
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}
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static bool path_is_busy(const char *where) {
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int r;
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/* already a mountpoint; generators run during reload */
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r = path_is_mount_point(where, AT_SYMLINK_FOLLOW);
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if (r > 0)
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return false;
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/* the directory might not exist on a stateless system */
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if (r == -ENOENT)
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return false;
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if (r < 0)
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return true;
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/* not a mountpoint but it contains files */
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if (dir_is_empty(where) <= 0)
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return true;
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return false;
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}
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static int probe_and_add_mount(
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const char *id,
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const char *what,
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const char *where,
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bool rw,
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const char *description,
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const char *post) {
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_cleanup_blkid_free_probe_ blkid_probe b = NULL;
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const char *fstype = NULL;
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int r;
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assert(id);
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assert(what);
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assert(where);
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assert(description);
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if (path_is_busy(where)) {
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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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/* Let's check the partition type here, so that we know
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* whether to do LUKS magic. */
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errno = 0;
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b = blkid_new_probe_from_filename(what);
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if (!b) {
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if (errno == 0)
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return log_oom();
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log_error_errno(errno, "Failed to allocate prober: %m");
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return -errno;
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}
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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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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 0;
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else if (r != 0)
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return log_error_errno(errno ?: EIO, "Failed to probe %s: %m", what);
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/* add_mount is OK with fstype being NULL. */
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(void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
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return add_mount(
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id,
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what,
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where,
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fstype,
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rw,
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NULL,
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description,
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post);
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}
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static int add_swap(const char *path) {
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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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int r;
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assert(path);
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log_debug("Adding swap: %s", path);
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r = unit_name_from_path(path, ".swap", &name);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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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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return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
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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=Swap Partition\n"
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"Documentation=man:systemd-gpt-auto-generator(8)\n\n"
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"[Swap]\n"
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"What=%s\n",
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path);
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r = fflush_and_check(f);
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if (r < 0)
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return log_error_errno(r, "Failed to write unit file %s: %m", unit);
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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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return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
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return 0;
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}
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#ifdef ENABLE_EFI
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static int add_automount(
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const char *id,
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const char *what,
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const char *where,
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const char *fstype,
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bool rw,
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const char *options,
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const char *description,
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usec_t timeout) {
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_cleanup_free_ char *unit = NULL, *lnk = NULL;
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_cleanup_free_ char *opt, *p = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(id);
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assert(where);
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assert(description);
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if (options)
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opt = strjoin(options, ",noauto", NULL);
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else
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opt = strdup("noauto");
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if (!opt)
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return log_oom();
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r = add_mount(id,
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what,
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where,
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fstype,
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rw,
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opt,
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description,
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NULL);
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if (r < 0)
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return r;
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r = unit_name_from_path(where, ".automount", &unit);
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if (r < 0)
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return log_error_errno(r, "Failed to generate unit name: %m");
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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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return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
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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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"Documentation=man:systemd-gpt-auto-generator(8)\n"
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"[Automount]\n"
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"Where=%s\n"
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"TimeoutIdleSec=%lld\n",
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description,
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where,
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(unsigned long long)timeout / USEC_PER_SEC);
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r = fflush_and_check(f);
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if (r < 0)
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return log_error_errno(r, "Failed to write unit file %s: %m", p);
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lnk = strjoin(arg_dest, "/" SPECIAL_LOCAL_FS_TARGET ".wants/", 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(p, lnk) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
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return 0;
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}
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static int add_boot(const char *what) {
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_cleanup_blkid_free_probe_ blkid_probe b = NULL;
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const char *fstype = NULL, *uuid = NULL;
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sd_id128_t id, type_id;
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int r;
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assert(what);
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if (!is_efi_boot()) {
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log_debug("Not an EFI boot, ignoring /boot.");
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return 0;
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}
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if (in_initrd()) {
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log_debug("In initrd, ignoring /boot.");
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return 0;
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}
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if (detect_container() > 0) {
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log_debug("In a container, ignoring /boot.");
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return 0;
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}
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/* We create an .automount which is not overridden by the .mount from the fstab generator. */
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if (fstab_is_mount_point("/boot")) {
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log_debug("/boot specified in fstab, ignoring.");
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return 0;
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}
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if (path_is_busy("/boot")) {
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log_debug("/boot already populated, ignoring.");
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return 0;
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}
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r = efi_loader_get_device_part_uuid(&id);
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if (r == -ENOENT) {
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log_debug("EFI loader partition unknown.");
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return 0;
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}
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if (r < 0) {
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log_error_errno(r, "Failed to read ESP partition UUID: %m");
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return r;
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}
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errno = 0;
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b = blkid_new_probe_from_filename(what);
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if (!b) {
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if (errno == 0)
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return log_oom();
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log_error_errno(errno, "Failed to allocate prober: %m");
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return -errno;
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}
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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 0;
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else if (r != 0)
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return log_error_errno(errno ?: EIO, "Failed to probe %s: %m", what);
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(void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
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if (!streq(fstype, "vfat")) {
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log_debug("Partition for /boot is not a FAT filesystem, ignoring.");
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return 0;
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}
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r = blkid_probe_lookup_value(b, "PART_ENTRY_UUID", &uuid, NULL);
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if (r != 0) {
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log_debug_errno(r, "Partition for /boot does not have a UUID, ignoring. %m");
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return 0;
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}
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if (sd_id128_from_string(uuid, &type_id) < 0) {
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log_debug("Partition for /boot does not have a valid UUID, ignoring.");
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return 0;
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}
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if (!sd_id128_equal(type_id, id)) {
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log_debug("Partition for /boot does not appear to be the partition we are booted from.");
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return 0;
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}
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|
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)
|
|
return log_error_errno(errno ?: EIO,
|
|
"%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;
|
|
}
|