965 lines
32 KiB
C
965 lines
32 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-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 "main-func.h"
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#include "mkdir.h"
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#include "mount-setup.h"
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#include "mount-util.h"
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#include "mountpoint-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "proc-cmdline.h"
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#include "special.h"
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#include "specifier.h"
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#include "stat-util.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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#include "volatile-util.h"
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typedef enum MountpointFlags {
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NOAUTO = 1 << 0,
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NOFAIL = 1 << 1,
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AUTOMOUNT = 1 << 2,
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MAKEFS = 1 << 3,
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GROWFS = 1 << 4,
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RWONLY = 1 << 5,
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} MountpointFlags;
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static const char *arg_dest = NULL;
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static const char *arg_dest_late = NULL;
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static bool arg_fstab_enabled = true;
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static bool arg_swap_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 char *arg_root_hash = 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 VolatileMode arg_volatile_mode = _VOLATILE_MODE_INVALID;
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STATIC_DESTRUCTOR_REGISTER(arg_root_what, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_root_fstype, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_root_options, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_root_hash, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_usr_what, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_usr_fstype, freep);
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STATIC_DESTRUCTOR_REGISTER(arg_usr_options, freep);
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static int write_options(FILE *f, const char *options) {
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_cleanup_free_ char *o = NULL;
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if (isempty(options))
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return 0;
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if (streq(options, "defaults"))
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return 0;
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o = specifier_escape(options);
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if (!o)
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return log_oom();
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fprintf(f, "Options=%s\n", o);
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return 1;
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}
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static int write_what(FILE *f, const char *what) {
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_cleanup_free_ char *w = NULL;
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w = specifier_escape(what);
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if (!w)
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return log_oom();
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fprintf(f, "What=%s\n", w);
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return 1;
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}
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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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MountpointFlags flags) {
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_cleanup_free_ char *name = 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 (!arg_swap_enabled) {
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log_info("Swap unit generation disabled on kernel command line, ignoring fstab swap entry for %s.", what);
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return 0;
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}
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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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r = generator_open_unit_file(arg_dest, fstab_path(), name, &f);
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if (r < 0)
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return r;
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fprintf(f,
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"[Unit]\n"
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"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n"
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"SourcePath=%s\n",
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fstab_path());
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r = generator_write_blockdev_dependency(f, what);
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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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"[Swap]\n");
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r = write_what(f, what);
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if (r < 0)
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return r;
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r = write_options(f, me->mnt_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", name);
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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 (flags & MAKEFS) {
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r = generator_hook_up_mkswap(arg_dest, what);
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if (r < 0)
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return r;
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}
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if (flags & GROWFS)
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/* TODO: swap devices must be wiped and recreated */
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log_warning("%s: growing swap devices is currently unsupported.", what);
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if (!(flags & NOAUTO)) {
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r = generator_add_symlink(arg_dest, SPECIAL_SWAP_TARGET,
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(flags & NOFAIL) ? "wants" : "requires", name);
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if (r < 0)
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return r;
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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_timeout(
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FILE *f,
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const char *where,
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const char *opts,
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const char *filter,
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const char *variable) {
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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, filter, 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_fix_0(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, "%s=%s\n", variable, format_timespan(timespan, sizeof(timespan), u, 0));
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return 0;
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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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return write_timeout(f, where, opts,
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"x-systemd.idle-timeout\0", "TimeoutIdleSec");
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}
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static int write_mount_timeout(FILE *f, const char *where, const char *opts) {
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return write_timeout(f, where, opts,
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"x-systemd.mount-timeout\0", "TimeoutSec");
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}
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static int write_dependency(
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FILE *f,
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const char *opts,
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const char *filter,
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const char *format) {
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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, filter, &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, "as dependency", 0, ".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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DISABLE_WARNING_FORMAT_NONLITERAL;
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fprintf(f, format, res);
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REENABLE_WARNING;
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}
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return 0;
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}
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static int write_after(FILE *f, const char *opts) {
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return write_dependency(f, opts,
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"x-systemd.after", "After=%1$s\n");
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}
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static int write_requires_after(FILE *f, const char *opts) {
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return write_dependency(f, opts,
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"x-systemd.requires", "After=%1$s\nRequires=%1$s\n");
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}
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static int write_before(FILE *f, const char *opts) {
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return write_dependency(f, opts,
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"x-systemd.before", "Before=%1$s\n");
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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, **paths_escaped = 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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r = specifier_escape_strv(paths, &paths_escaped);
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if (r < 0)
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return log_error_errno(r, "Failed to escape paths: %m");
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res = strv_join(paths_escaped, " ");
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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 write_extra_dependencies(FILE *f, const char *opts) {
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int r;
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assert(f);
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if (opts) {
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r = write_after(f, opts);
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if (r < 0)
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return r;
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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_before(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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return 0;
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}
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static int add_mount(
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const char *dest,
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const char *what,
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const char *where,
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const char *original_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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MountpointFlags flags,
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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,
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*automount_name = NULL,
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*filtered = NULL,
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*where_escaped = NULL;
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_cleanup_strv_free_ char **wanted_by = NULL, **required_by = 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(post);
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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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r = fstab_extract_values(opts, "x-systemd.wanted-by", &wanted_by);
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if (r < 0)
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return r;
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r = fstab_extract_values(opts, "x-systemd.required-by", &required_by);
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if (r < 0)
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return r;
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if (path_equal(where, "/")) {
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if (flags & NOAUTO)
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log_warning("Ignoring \"noauto\" for root device");
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if (flags & NOFAIL)
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log_warning("Ignoring \"nofail\" for root device");
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if (flags & AUTOMOUNT)
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log_warning("Ignoring automount option for root device");
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if (!strv_isempty(wanted_by))
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log_warning("Ignoring \"x-systemd.wanted-by=\" for root device");
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if (!strv_isempty(required_by))
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log_warning("Ignoring \"x-systemd.required-by=\" for root device");
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required_by = strv_free(required_by);
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wanted_by = strv_free(wanted_by);
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SET_FLAG(flags, 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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r = generator_open_unit_file(dest, fstab_path(), name, &f);
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if (r < 0)
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return r;
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fprintf(f,
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"[Unit]\n"
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"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n"
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"SourcePath=%s\n",
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source);
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if (STRPTR_IN_SET(fstype, "nfs", "nfs4") && !(flags & AUTOMOUNT) &&
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fstab_test_yes_no_option(opts, "bg\0" "fg\0")) {
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/* The default retry timeout that mount.nfs uses for 'bg' mounts
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* is 10000 minutes, where as it uses 2 minutes for 'fg' mounts.
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* As we are making 'bg' mounts look like an 'fg' mount to
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* mount.nfs (so systemd can manage the job-control aspects of 'bg'),
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* we need to explicitly preserve that default, and also ensure
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* the systemd mount-timeout doesn't interfere.
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* By placing these options first, they can be over-ridden by
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* settings in /etc/fstab. */
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opts = strjoina("x-systemd.mount-timeout=infinity,retry=10000,nofail,", opts, ",fg");
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SET_FLAG(flags, NOFAIL, true);
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}
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r = write_extra_dependencies(f, opts);
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if (r < 0)
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return r;
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if (passno != 0) {
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r = generator_write_fsck_deps(f, 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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r = generator_write_blockdev_dependency(f, what);
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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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if (original_where)
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fprintf(f, "# Canonicalized from %s\n", original_where);
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where_escaped = specifier_escape(where);
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if (!where_escaped)
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return log_oom();
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fprintf(f, "Where=%s\n", where_escaped);
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r = write_what(f, what);
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if (r < 0)
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return r;
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if (!isempty(fstype) && !streq(fstype, "auto")) {
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_cleanup_free_ char *t;
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t = specifier_escape(fstype);
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if (!t)
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return -ENOMEM;
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fprintf(f, "Type=%s\n", t);
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}
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r = generator_write_timeouts(dest, what, where, opts, &filtered);
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if (r < 0)
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return r;
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r = generator_write_device_deps(dest, what, where, opts);
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if (r < 0)
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return r;
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r = write_mount_timeout(f, where, opts);
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if (r < 0)
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return r;
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r = write_options(f, filtered);
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if (r < 0)
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return r;
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if (flags & RWONLY)
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fprintf(f, "ReadWriteOnly=yes\n");
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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", name);
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if (flags & MAKEFS) {
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r = generator_hook_up_mkfs(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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if (flags & GROWFS) {
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r = generator_hook_up_growfs(dest, where, post);
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if (r < 0)
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return r;
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}
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if (!FLAGS_SET(flags, AUTOMOUNT)) {
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if (!FLAGS_SET(flags, NOAUTO) && strv_isempty(wanted_by) && strv_isempty(required_by)) {
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r = generator_add_symlink(dest, post,
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(flags & NOFAIL) ? "wants" : "requires", name);
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if (r < 0)
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return r;
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} else {
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char **s;
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STRV_FOREACH(s, wanted_by) {
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r = generator_add_symlink(dest, *s, "wants", name);
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if (r < 0)
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return r;
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}
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STRV_FOREACH(s, required_by) {
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r = generator_add_symlink(dest, *s, "requires", name);
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if (r < 0)
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return r;
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}
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}
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} else {
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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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f = safe_fclose(f);
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r = generator_open_unit_file(dest, fstab_path(), automount_name, &f);
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if (r < 0)
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return r;
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|
|
fprintf(f,
|
|
"[Unit]\n"
|
|
"SourcePath=%s\n"
|
|
"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n",
|
|
source);
|
|
|
|
fprintf(f,
|
|
"\n"
|
|
"[Automount]\n"
|
|
"Where=%s\n",
|
|
where_escaped);
|
|
|
|
r = write_idle_timeout(f, where, opts);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = fflush_and_check(f);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to write unit file %s: %m", automount_name);
|
|
|
|
r = generator_add_symlink(dest, post,
|
|
(flags & NOFAIL) ? "wants" : "requires", automount_name);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_fstab(bool initrd) {
|
|
_cleanup_endmntent_ FILE *f = NULL;
|
|
const char *fstab;
|
|
struct mntent *me;
|
|
int r = 0;
|
|
|
|
fstab = initrd ? "/sysroot/etc/fstab" : fstab_path();
|
|
log_debug("Parsing %s...", fstab);
|
|
|
|
f = setmntent(fstab, "re");
|
|
if (!f) {
|
|
if (errno == ENOENT)
|
|
return 0;
|
|
|
|
return log_error_errno(errno, "Failed to open %s: %m", fstab);
|
|
}
|
|
|
|
while ((me = getmntent(f))) {
|
|
_cleanup_free_ char *where = NULL, *what = NULL, *canonical_where = NULL;
|
|
bool makefs, growfs, noauto, nofail, rwonly;
|
|
int k;
|
|
|
|
if (initrd && !mount_in_initrd(me))
|
|
continue;
|
|
|
|
what = fstab_node_to_udev_node(me->mnt_fsname);
|
|
if (!what)
|
|
return log_oom();
|
|
|
|
if (is_device_path(what) && path_is_read_only_fs("/sys") > 0) {
|
|
log_info("Running in a container, ignoring fstab device entry for %s.", what);
|
|
continue;
|
|
}
|
|
|
|
where = strdup(me->mnt_dir);
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
if (is_path(where)) {
|
|
path_simplify(where, false);
|
|
|
|
/* Follow symlinks here; see 5261ba901845c084de5a8fd06500ed09bfb0bd80 which makes sense for
|
|
* mount units, but causes problems since it historically worked to have symlinks in e.g.
|
|
* /etc/fstab. So we canonicalize here. Note that we use CHASE_NONEXISTENT to handle the case
|
|
* where a symlink refers to another mount target; this works assuming the sub-mountpoint
|
|
* target is the final directory. */
|
|
r = chase_symlinks(where, initrd ? "/sysroot" : NULL,
|
|
CHASE_PREFIX_ROOT | CHASE_NONEXISTENT,
|
|
&canonical_where, NULL);
|
|
if (r < 0) /* If we can't canonicalize we continue on as if it wasn't a symlink */
|
|
log_debug_errno(r, "Failed to read symlink target for %s, ignoring: %m", where);
|
|
else if (streq(canonical_where, where)) /* If it was fully canonicalized, suppress the change */
|
|
canonical_where = mfree(canonical_where);
|
|
else
|
|
log_debug("Canonicalized what=%s where=%s to %s", what, where, canonical_where);
|
|
}
|
|
|
|
makefs = fstab_test_option(me->mnt_opts, "x-systemd.makefs\0");
|
|
growfs = fstab_test_option(me->mnt_opts, "x-systemd.growfs\0");
|
|
rwonly = fstab_test_option(me->mnt_opts, "x-systemd.rw-only\0");
|
|
noauto = fstab_test_yes_no_option(me->mnt_opts, "noauto\0" "auto\0");
|
|
nofail = fstab_test_yes_no_option(me->mnt_opts, "nofail\0" "fail\0");
|
|
|
|
log_debug("Found entry what=%s where=%s type=%s makefs=%s growfs=%s noauto=%s nofail=%s",
|
|
what, where, me->mnt_type,
|
|
yes_no(makefs), yes_no(growfs),
|
|
yes_no(noauto), yes_no(nofail));
|
|
|
|
if (streq(me->mnt_type, "swap"))
|
|
k = add_swap(what, me,
|
|
makefs*MAKEFS | growfs*GROWFS | noauto*NOAUTO | nofail*NOFAIL);
|
|
else {
|
|
bool automount;
|
|
const char *post;
|
|
|
|
automount = fstab_test_option(me->mnt_opts,
|
|
"comment=systemd.automount\0"
|
|
"x-systemd.automount\0");
|
|
if (initrd)
|
|
post = SPECIAL_INITRD_FS_TARGET;
|
|
else if (mount_is_network(me))
|
|
post = SPECIAL_REMOTE_FS_TARGET;
|
|
else
|
|
post = SPECIAL_LOCAL_FS_TARGET;
|
|
|
|
k = add_mount(arg_dest,
|
|
what,
|
|
canonical_where ?: where,
|
|
canonical_where ? where: NULL,
|
|
me->mnt_type,
|
|
me->mnt_opts,
|
|
me->mnt_passno,
|
|
makefs*MAKEFS | growfs*GROWFS | noauto*NOAUTO | nofail*NOFAIL | automount*AUTOMOUNT | rwonly*RWONLY,
|
|
post,
|
|
fstab);
|
|
}
|
|
|
|
if (r >= 0 && k < 0)
|
|
r = k;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int add_sysroot_mount(void) {
|
|
_cleanup_free_ char *what = NULL;
|
|
const char *opts;
|
|
int r;
|
|
|
|
if (isempty(arg_root_what)) {
|
|
log_debug("Could not find a root= entry on the kernel command line.");
|
|
return 0;
|
|
}
|
|
|
|
if (streq(arg_root_what, "gpt-auto")) {
|
|
/* This is handled by the gpt-auto generator */
|
|
log_debug("Skipping root directory handling, as gpt-auto was requested.");
|
|
return 0;
|
|
}
|
|
|
|
if (path_equal(arg_root_what, "/dev/nfs")) {
|
|
/* This is handled by the kernel or the initrd */
|
|
log_debug("Skipping root directory handling, as /dev/nfs was requested.");
|
|
return 0;
|
|
}
|
|
|
|
what = fstab_node_to_udev_node(arg_root_what);
|
|
if (!what)
|
|
return log_oom();
|
|
|
|
if (!arg_root_options)
|
|
opts = arg_root_rw > 0 ? "rw" : "ro";
|
|
else if (arg_root_rw >= 0 ||
|
|
!fstab_test_option(arg_root_options, "ro\0" "rw\0"))
|
|
opts = strjoina(arg_root_options, ",", arg_root_rw > 0 ? "rw" : "ro");
|
|
else
|
|
opts = arg_root_options;
|
|
|
|
log_debug("Found entry what=%s where=/sysroot type=%s", what, strna(arg_root_fstype));
|
|
|
|
if (is_device_path(what)) {
|
|
r = generator_write_initrd_root_device_deps(arg_dest, what);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return add_mount(arg_dest,
|
|
what,
|
|
"/sysroot",
|
|
NULL,
|
|
arg_root_fstype,
|
|
opts,
|
|
is_device_path(what) ? 1 : 0, /* passno */
|
|
0, /* makefs off, growfs off, noauto off, nofail off, automount off */
|
|
SPECIAL_INITRD_ROOT_FS_TARGET,
|
|
"/proc/cmdline");
|
|
}
|
|
|
|
static int add_sysroot_usr_mount(void) {
|
|
_cleanup_free_ char *what = NULL;
|
|
const char *opts;
|
|
|
|
if (!arg_usr_what && !arg_usr_fstype && !arg_usr_options)
|
|
return 0;
|
|
|
|
if (arg_root_what && !arg_usr_what) {
|
|
/* Copy over the root device, in case the /usr mount just differs in a mount option (consider btrfs subvolumes) */
|
|
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 (!what)
|
|
return log_oom();
|
|
|
|
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(arg_dest,
|
|
what,
|
|
"/sysroot/usr",
|
|
NULL,
|
|
arg_usr_fstype,
|
|
opts,
|
|
is_device_path(what) ? 1 : 0, /* passno */
|
|
0,
|
|
SPECIAL_INITRD_FS_TARGET,
|
|
"/proc/cmdline");
|
|
}
|
|
|
|
static int add_volatile_root(void) {
|
|
|
|
/* Let's add in systemd-remount-volatile.service which will remount the root device to tmpfs if this is
|
|
* requested (or as an overlayfs), leaving only /usr from the root mount inside. */
|
|
|
|
if (!IN_SET(arg_volatile_mode, VOLATILE_YES, VOLATILE_OVERLAY))
|
|
return 0;
|
|
|
|
return generator_add_symlink(arg_dest, SPECIAL_INITRD_ROOT_FS_TARGET, "requires",
|
|
SYSTEM_DATA_UNIT_PATH "/" SPECIAL_VOLATILE_ROOT_SERVICE);
|
|
}
|
|
|
|
static int add_volatile_var(void) {
|
|
|
|
if (arg_volatile_mode != VOLATILE_STATE)
|
|
return 0;
|
|
|
|
/* If requested, mount /var as tmpfs, but do so only if there's nothing else defined for this. */
|
|
|
|
return add_mount(arg_dest_late,
|
|
"tmpfs",
|
|
"/var",
|
|
NULL,
|
|
"tmpfs",
|
|
"mode=0755" TMPFS_LIMITS_VAR,
|
|
0,
|
|
0,
|
|
SPECIAL_LOCAL_FS_TARGET,
|
|
"/proc/cmdline");
|
|
}
|
|
|
|
static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
|
|
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")) {
|
|
|
|
r = value ? parse_boolean(value) : 1;
|
|
if (r < 0)
|
|
log_warning("Failed to parse fstab switch %s. Ignoring.", value);
|
|
else
|
|
arg_fstab_enabled = r;
|
|
|
|
} else if (streq(key, "root")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
if (free_and_strdup(&arg_root_what, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "rootfstype")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
if (free_and_strdup(&arg_root_fstype, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "rootflags")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
if (!strextend_with_separator(&arg_root_options, ",", value))
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "roothash")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
if (free_and_strdup(&arg_root_hash, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "mount.usr")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
if (free_and_strdup(&arg_usr_what, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "mount.usrfstype")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
if (free_and_strdup(&arg_usr_fstype, value) < 0)
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "mount.usrflags")) {
|
|
|
|
if (proc_cmdline_value_missing(key, value))
|
|
return 0;
|
|
|
|
if (!strextend_with_separator(&arg_usr_options, ",", value))
|
|
return log_oom();
|
|
|
|
} else if (streq(key, "rw") && !value)
|
|
arg_root_rw = true;
|
|
else if (streq(key, "ro") && !value)
|
|
arg_root_rw = false;
|
|
else if (streq(key, "systemd.volatile")) {
|
|
VolatileMode m;
|
|
|
|
if (value) {
|
|
m = volatile_mode_from_string(value);
|
|
if (m < 0)
|
|
log_warning("Failed to parse systemd.volatile= argument: %s", value);
|
|
else
|
|
arg_volatile_mode = m;
|
|
} else
|
|
arg_volatile_mode = VOLATILE_YES;
|
|
|
|
} else if (streq(key, "systemd.swap")) {
|
|
|
|
r = value ? parse_boolean(value) : 1;
|
|
if (r < 0)
|
|
log_warning("Failed to parse systemd.swap switch %s. Ignoring.", value);
|
|
else
|
|
arg_swap_enabled = r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int determine_root(void) {
|
|
/* If we have a root hash but no root device then Verity is used, and we use the "root" DM device as root. */
|
|
|
|
if (arg_root_what)
|
|
return 0;
|
|
|
|
if (!arg_root_hash)
|
|
return 0;
|
|
|
|
arg_root_what = strdup("/dev/mapper/root");
|
|
if (!arg_root_what)
|
|
return log_oom();
|
|
|
|
log_info("Using verity root device %s.", arg_root_what);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int run(const char *dest, const char *dest_early, const char *dest_late) {
|
|
int r, r2 = 0, r3 = 0;
|
|
|
|
assert_se(arg_dest = dest);
|
|
assert_se(arg_dest_late = dest_late);
|
|
|
|
r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, 0);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
|
|
|
|
(void) determine_root();
|
|
|
|
/* Always honour root= and usr= in the kernel command line if we are in an initrd */
|
|
if (in_initrd()) {
|
|
r = add_sysroot_mount();
|
|
|
|
r2 = add_sysroot_usr_mount();
|
|
|
|
r3 = add_volatile_root();
|
|
} else
|
|
r = add_volatile_var();
|
|
|
|
/* Honour /etc/fstab only when that's enabled */
|
|
if (arg_fstab_enabled) {
|
|
/* Parse the local /etc/fstab, possibly from the initrd */
|
|
r2 = parse_fstab(false);
|
|
|
|
/* If running in the initrd also parse the /etc/fstab from the host */
|
|
if (in_initrd())
|
|
r3 = parse_fstab(true);
|
|
else
|
|
r3 = generator_enable_remount_fs_service(arg_dest);
|
|
}
|
|
|
|
return r < 0 ? r : r2 < 0 ? r2 : r3;
|
|
}
|
|
|
|
DEFINE_MAIN_GENERATOR_FUNCTION(run);
|