705 lines
23 KiB
C
705 lines
23 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 2012 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 <errno.h>
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#include <mntent.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "fd-util.h"
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#include "fstab-util.h"
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#include "generator.h"
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#include "log.h"
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#include "mkdir.h"
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#include "mount-setup.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 "strv.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_fstab_enabled = true;
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static char *arg_root_what = NULL;
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static char *arg_root_fstype = NULL;
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static char *arg_root_options = NULL;
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static int arg_root_rw = -1;
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static char *arg_usr_what = NULL;
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static char *arg_usr_fstype = NULL;
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static char *arg_usr_options = NULL;
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static int add_swap(
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const char *what,
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struct mntent *me,
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bool noauto,
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bool nofail) {
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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(what);
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assert(me);
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if (access("/proc/swaps", F_OK) < 0) {
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log_info("Swap not supported, ignoring fstab swap entry for %s.", what);
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return 0;
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}
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if (detect_container() > 0) {
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log_info("Running in a container, ignoring fstab swap entry for %s.", what);
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return 0;
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}
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r = unit_name_from_path(what, ".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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if (errno == EEXIST)
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log_error("Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
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else
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log_error_errno(errno, "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-fstab-generator\n\n"
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"[Unit]\n"
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"SourcePath=/etc/fstab\n"
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"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n"
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"[Swap]\n"
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"What=%s\n",
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what);
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if (!isempty(me->mnt_opts) && !streq(me->mnt_opts, "defaults"))
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fprintf(f, "Options=%s\n", me->mnt_opts);
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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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/* use what as where, to have a nicer error message */
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r = generator_write_timeouts(arg_dest, what, what, me->mnt_opts, NULL);
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if (r < 0)
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return r;
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if (!noauto) {
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lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET,
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nofail ? ".wants/" : ".requires/", 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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}
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return 0;
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}
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static bool mount_is_network(struct mntent *me) {
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assert(me);
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return fstab_test_option(me->mnt_opts, "_netdev\0") ||
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fstype_is_network(me->mnt_type);
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}
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static bool mount_in_initrd(struct mntent *me) {
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assert(me);
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return fstab_test_option(me->mnt_opts, "x-initrd.mount\0") ||
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streq(me->mnt_dir, "/usr");
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}
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static int write_idle_timeout(FILE *f, const char *where, const char *opts) {
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_cleanup_free_ char *timeout = NULL;
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char timespan[FORMAT_TIMESPAN_MAX];
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usec_t u;
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int r;
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r = fstab_filter_options(opts, "x-systemd.idle-timeout\0", NULL, &timeout, NULL);
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if (r < 0)
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return log_warning_errno(r, "Failed to parse options: %m");
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if (r == 0)
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return 0;
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r = parse_sec(timeout, &u);
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if (r < 0) {
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log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
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return 0;
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}
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fprintf(f, "TimeoutIdleSec=%s\n", format_timespan(timespan, sizeof(timespan), u, 0));
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return 0;
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}
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static int write_requires_after(FILE *f, const char *opts) {
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_cleanup_strv_free_ char **names = NULL, **units = NULL;
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_cleanup_free_ char *res = NULL;
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char **s;
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int r;
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assert(f);
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assert(opts);
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r = fstab_extract_values(opts, "x-systemd.requires", &names);
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if (r < 0)
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return log_warning_errno(r, "Failed to parse options: %m");
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if (r == 0)
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return 0;
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STRV_FOREACH(s, names) {
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char *x;
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r = unit_name_mangle_with_suffix(*s, UNIT_NAME_NOGLOB, ".mount", &x);
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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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r = strv_consume(&units, x);
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if (r < 0)
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return log_oom();
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}
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if (units) {
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res = strv_join(units, " ");
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if (!res)
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return log_oom();
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fprintf(f, "After=%1$s\nRequires=%1$s\n", res);
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}
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return 0;
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}
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static int write_requires_mounts_for(FILE *f, const char *opts) {
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_cleanup_strv_free_ char **paths = NULL;
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_cleanup_free_ char *res = NULL;
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int r;
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assert(f);
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assert(opts);
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r = fstab_extract_values(opts, "x-systemd.requires-mounts-for", &paths);
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if (r < 0)
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return log_warning_errno(r, "Failed to parse options: %m");
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if (r == 0)
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return 0;
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res = strv_join(paths, " ");
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if (!res)
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return log_oom();
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fprintf(f, "RequiresMountsFor=%s\n", res);
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return 0;
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}
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static int add_mount(
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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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const char *opts,
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int passno,
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bool noauto,
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bool nofail,
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bool automount,
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const char *post,
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const char *source) {
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_cleanup_free_ char
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*name = NULL, *unit = NULL, *lnk = NULL,
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*automount_name = NULL, *automount_unit = NULL,
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*filtered = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(what);
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assert(where);
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assert(opts);
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assert(source);
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if (streq_ptr(fstype, "autofs"))
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return 0;
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if (!is_path(where)) {
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log_warning("Mount point %s is not a valid path, ignoring.", where);
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return 0;
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}
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if (mount_point_is_api(where) ||
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mount_point_ignore(where))
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return 0;
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if (path_equal(where, "/")) {
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if (noauto)
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log_warning("Ignoring \"noauto\" for root device");
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if (nofail)
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log_warning("Ignoring \"nofail\" for root device");
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if (automount)
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log_warning("Ignoring automount option for root device");
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noauto = nofail = automount = false;
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}
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r = unit_name_from_path(where, ".mount", &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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if (errno == EEXIST)
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log_error("Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit);
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else
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log_error_errno(errno, "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-fstab-generator\n\n"
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"[Unit]\n"
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"SourcePath=%s\n"
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"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n",
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source);
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if (post && !noauto && !nofail && !automount)
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fprintf(f, "Before=%s\n", post);
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if (!automount && opts) {
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r = write_requires_after(f, opts);
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if (r < 0)
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return r;
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r = write_requires_mounts_for(f, opts);
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if (r < 0)
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return r;
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}
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if (passno != 0) {
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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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}
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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,
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where);
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if (!isempty(fstype) && !streq(fstype, "auto"))
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fprintf(f, "Type=%s\n", fstype);
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r = generator_write_timeouts(arg_dest, what, where, opts, &filtered);
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if (r < 0)
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return r;
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if (!isempty(filtered) && !streq(filtered, "defaults"))
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fprintf(f, "Options=%s\n", filtered);
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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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if (!noauto && post) {
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lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", 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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}
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if (automount) {
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r = unit_name_from_path(where, ".automount", &automount_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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automount_unit = strjoin(arg_dest, "/", automount_name, NULL);
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if (!automount_unit)
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return log_oom();
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fclose(f);
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f = fopen(automount_unit, "wxe");
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if (!f)
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return log_error_errno(errno, "Failed to create unit file %s: %m", automount_unit);
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fprintf(f,
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"# Automatically generated by systemd-fstab-generator\n\n"
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"[Unit]\n"
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"SourcePath=%s\n"
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"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n",
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source);
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if (post)
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fprintf(f,
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"Before=%s\n",
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post);
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if (opts) {
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r = write_requires_after(f, opts);
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if (r < 0)
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return r;
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r = write_requires_mounts_for(f, opts);
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if (r < 0)
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return r;
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}
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fprintf(f,
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"[Automount]\n"
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"Where=%s\n",
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where);
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r = write_idle_timeout(f, where, opts);
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if (r < 0)
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return r;
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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", automount_unit);
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free(lnk);
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lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_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(automount_unit, 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 int parse_fstab(bool initrd) {
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_cleanup_endmntent_ FILE *f = NULL;
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const char *fstab_path;
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struct mntent *me;
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int r = 0;
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fstab_path = initrd ? "/sysroot/etc/fstab" : "/etc/fstab";
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f = setmntent(fstab_path, "re");
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if (!f) {
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if (errno == ENOENT)
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return 0;
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log_error_errno(errno, "Failed to open %s: %m", fstab_path);
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return -errno;
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}
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while ((me = getmntent(f))) {
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_cleanup_free_ char *where = NULL, *what = NULL;
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bool noauto, nofail;
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int k;
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if (initrd && !mount_in_initrd(me))
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continue;
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what = fstab_node_to_udev_node(me->mnt_fsname);
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if (!what)
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return log_oom();
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if (is_device_path(what) && path_is_read_only_fs("sys") > 0) {
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log_info("Running in a container, ignoring fstab device entry for %s.", what);
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continue;
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}
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where = initrd ? strappend("/sysroot/", me->mnt_dir) : strdup(me->mnt_dir);
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if (!where)
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return log_oom();
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if (is_path(where))
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path_kill_slashes(where);
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noauto = fstab_test_yes_no_option(me->mnt_opts, "noauto\0" "auto\0");
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nofail = fstab_test_yes_no_option(me->mnt_opts, "nofail\0" "fail\0");
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log_debug("Found entry what=%s where=%s type=%s nofail=%s noauto=%s",
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what, where, me->mnt_type,
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yes_no(noauto), yes_no(nofail));
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if (streq(me->mnt_type, "swap"))
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k = add_swap(what, me, noauto, nofail);
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else {
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bool automount;
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const char *post;
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automount = fstab_test_option(me->mnt_opts,
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"comment=systemd.automount\0"
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"x-systemd.automount\0");
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if (initrd)
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post = SPECIAL_INITRD_FS_TARGET;
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else if (mount_in_initrd(me))
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post = SPECIAL_INITRD_ROOT_FS_TARGET;
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else if (mount_is_network(me))
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post = SPECIAL_REMOTE_FS_TARGET;
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else
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post = SPECIAL_LOCAL_FS_TARGET;
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k = add_mount(what,
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where,
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me->mnt_type,
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me->mnt_opts,
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me->mnt_passno,
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noauto,
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nofail,
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automount,
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post,
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fstab_path);
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}
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if (k < 0)
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r = k;
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}
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return r;
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}
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static int add_sysroot_mount(void) {
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_cleanup_free_ char *what = NULL;
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const char *opts;
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if (isempty(arg_root_what)) {
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log_debug("Could not find a root= entry on the kernel command line.");
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return 0;
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}
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what = fstab_node_to_udev_node(arg_root_what);
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if (!what)
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return log_oom();
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if (!arg_root_options)
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opts = arg_root_rw > 0 ? "rw" : "ro";
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else if (arg_root_rw >= 0 ||
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!fstab_test_option(arg_root_options, "ro\0" "rw\0"))
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opts = strjoina(arg_root_options, ",", arg_root_rw > 0 ? "rw" : "ro");
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else
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opts = arg_root_options;
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log_debug("Found entry what=%s where=/sysroot type=%s", what, strna(arg_root_fstype));
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return add_mount(what,
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"/sysroot",
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arg_root_fstype,
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opts,
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is_device_path(what) ? 1 : 0,
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false,
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false,
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false,
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SPECIAL_INITRD_ROOT_FS_TARGET,
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"/proc/cmdline");
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}
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static int add_sysroot_usr_mount(void) {
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_cleanup_free_ char *what = NULL;
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const char *opts;
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if (!arg_usr_what && !arg_usr_fstype && !arg_usr_options)
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return 0;
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if (arg_root_what && !arg_usr_what) {
|
|
arg_usr_what = strdup(arg_root_what);
|
|
|
|
if (!arg_usr_what)
|
|
return log_oom();
|
|
}
|
|
|
|
if (arg_root_fstype && !arg_usr_fstype) {
|
|
arg_usr_fstype = strdup(arg_root_fstype);
|
|
|
|
if (!arg_usr_fstype)
|
|
return log_oom();
|
|
}
|
|
|
|
if (arg_root_options && !arg_usr_options) {
|
|
arg_usr_options = strdup(arg_root_options);
|
|
|
|
if (!arg_usr_options)
|
|
return log_oom();
|
|
}
|
|
|
|
if (!arg_usr_what)
|
|
return 0;
|
|
|
|
what = fstab_node_to_udev_node(arg_usr_what);
|
|
if (!path_is_absolute(what)) {
|
|
log_debug("Skipping entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype));
|
|
return -1;
|
|
}
|
|
|
|
if (!arg_usr_options)
|
|
opts = arg_root_rw > 0 ? "rw" : "ro";
|
|
else if (!fstab_test_option(arg_usr_options, "ro\0" "rw\0"))
|
|
opts = strjoina(arg_usr_options, ",", arg_root_rw > 0 ? "rw" : "ro");
|
|
else
|
|
opts = arg_usr_options;
|
|
|
|
log_debug("Found entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype));
|
|
return add_mount(what,
|
|
"/sysroot/usr",
|
|
arg_usr_fstype,
|
|
opts,
|
|
1,
|
|
false,
|
|
false,
|
|
false,
|
|
SPECIAL_INITRD_ROOT_FS_TARGET,
|
|
"/proc/cmdline");
|
|
}
|
|
|
|
static int parse_proc_cmdline_item(const char *key, const char *value) {
|
|
int r;
|
|
|
|
/* root=, usr=, usrfstype= and roofstype= may occur more than once, the last
|
|
* instance should take precedence. In the case of multiple rootflags=
|
|
* or usrflags= the arguments should be concatenated */
|
|
|
|
if (STR_IN_SET(key, "fstab", "rd.fstab") && value) {
|
|
|
|
r = parse_boolean(value);
|
|
if (r < 0)
|
|
log_warning("Failed to parse fstab switch %s. Ignoring.", value);
|
|
else
|
|
arg_fstab_enabled = r;
|
|
|
|
} else if (streq(key, "root") && value) {
|
|
|
|
if (free_and_strdup(&arg_root_what, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "rootfstype") && value) {
|
|
|
|
if (free_and_strdup(&arg_root_fstype, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "rootflags") && value) {
|
|
char *o;
|
|
|
|
o = arg_root_options ?
|
|
strjoin(arg_root_options, ",", value, NULL) :
|
|
strdup(value);
|
|
if (!o)
|
|
return log_oom();
|
|
|
|
free(arg_root_options);
|
|
arg_root_options = o;
|
|
|
|
} else if (streq(key, "mount.usr") && value) {
|
|
|
|
if (free_and_strdup(&arg_usr_what, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "mount.usrfstype") && value) {
|
|
|
|
if (free_and_strdup(&arg_usr_fstype, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "mount.usrflags") && value) {
|
|
char *o;
|
|
|
|
o = arg_usr_options ?
|
|
strjoin(arg_usr_options, ",", value, NULL) :
|
|
strdup(value);
|
|
if (!o)
|
|
return log_oom();
|
|
|
|
free(arg_usr_options);
|
|
arg_usr_options = o;
|
|
|
|
} else if (streq(key, "rw") && !value)
|
|
arg_root_rw = true;
|
|
else if (streq(key, "ro") && !value)
|
|
arg_root_rw = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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[1];
|
|
|
|
log_set_target(LOG_TARGET_SAFE);
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
umask(0022);
|
|
|
|
r = parse_proc_cmdline(parse_proc_cmdline_item);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
|
|
|
|
/* Always honour root= and usr= in the kernel command line if we are in an initrd */
|
|
if (in_initrd()) {
|
|
r = add_sysroot_mount();
|
|
if (r == 0)
|
|
r = add_sysroot_usr_mount();
|
|
}
|
|
|
|
/* Honour /etc/fstab only when that's enabled */
|
|
if (arg_fstab_enabled) {
|
|
int k;
|
|
|
|
log_debug("Parsing /etc/fstab");
|
|
|
|
/* Parse the local /etc/fstab, possibly from the initrd */
|
|
k = parse_fstab(false);
|
|
if (k < 0)
|
|
r = k;
|
|
|
|
/* If running in the initrd also parse the /etc/fstab from the host */
|
|
if (in_initrd()) {
|
|
log_debug("Parsing /sysroot/etc/fstab");
|
|
|
|
k = parse_fstab(true);
|
|
if (k < 0)
|
|
r = k;
|
|
}
|
|
}
|
|
|
|
free(arg_root_what);
|
|
free(arg_root_fstype);
|
|
free(arg_root_options);
|
|
|
|
free(arg_usr_what);
|
|
free(arg_usr_fstype);
|
|
free(arg_usr_options);
|
|
|
|
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|