/* SPDX-License-Identifier: LGPL-2.1+ */
#include <errno.h>
#include <stdio_ext.h>
#include <unistd.h>
#include "alloc-util.h"
#include "dropin.h"
#include "escape.h"
#include "fd-util.h"
#include "fileio.h"
#include "fstab-util.h"
#include "generator.h"
#include "log.h"
#include "macro.h"
#include "mkdir.h"
#include "path-util.h"
#include "special.h"
#include "specifier.h"
#include "string-util.h"
#include "time-util.h"
#include "unit-name.h"
#include "util.h"
int generator_open_unit_file(
const char *dest,
const char *source,
const char *name,
FILE **file) {
const char *unit;
FILE *f;
unit = strjoina(dest, "/", name);
f = fopen(unit, "wxe");
if (!f) {
if (source && errno == EEXIST)
return log_error_errno(errno,
"Failed to create unit file %s, as it already exists. Duplicate entry in %s?",
unit, source);
else
return log_error_errno(errno,
"Failed to create unit file %s: %m",
unit);
}
(void) __fsetlocking(f, FSETLOCKING_BYCALLER);
fprintf(f,
"# Automatically generated by %s\n\n",
program_invocation_short_name);
*file = f;
return 0;
}
int generator_add_symlink(const char *root, const char *dst, const char *dep_type, const char *src) {
/* Adds a symlink from <dst>.<dep_type>.d/ to ../<src> */
const char *from, *to;
from = strjoina("../", src);
to = strjoina(root, "/", dst, ".", dep_type, "/", src);
mkdir_parents_label(to, 0755);
if (symlink(from, to) < 0)
if (errno != EEXIST)
return log_error_errno(errno, "Failed to create symlink \"%s\": %m", to);
return 0;
}
static int write_fsck_sysroot_service(const char *dir, const char *what) {
_cleanup_free_ char *device = NULL, *escaped = NULL, *escaped2 = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *unit;
int r;
escaped = specifier_escape(what);
if (!escaped)
return log_oom();
escaped2 = cescape(escaped);
if (!escaped2)
return log_oom();
unit = strjoina(dir, "/systemd-fsck-root.service");
log_debug("Creating %s", unit);
r = unit_name_from_path(what, ".device", &device);
if (r < 0)
return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
f = fopen(unit, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
fprintf(f,
"# Automatically generated by %1$s\n\n"
"[Unit]\n"
"Description=File System Check on %2$s\n"
"Documentation=man:systemd-fsck-root.service(8)\n"
"DefaultDependencies=no\n"
"BindsTo=%3$s\n"
"After=initrd-root-device.target local-fs-pre.target %3$s\n"
"Before=shutdown.target\n"
"\n"
"[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
"TimeoutSec=0\n",
program_invocation_short_name,
escaped,
device,
escaped2);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write unit file %s: %m", unit);
return 0;
}
int generator_write_fsck_deps(
FILE *f,
const char *dir,
const char *what,
const char *where,
const char *fstype) {
int r;
assert(f);
assert(dir);
assert(what);
assert(where);
if (!is_device_path(what)) {
log_warning("Checking was requested for \"%s\", but it is not a device.", what);
return 0;
}
if (!isempty(fstype) && !streq(fstype, "auto")) {
r = fsck_exists(fstype);
if (r < 0)
log_warning_errno(r, "Checking was requested for %s, but couldn't detect if fsck.%s may be used, proceeding: %m", what, fstype);
else if (r == 0) {
/* treat missing check as essentially OK */
log_debug("Checking was requested for %s, but fsck.%s does not exist.", what, fstype);
return 0;
}
}
if (path_equal(where, "/")) {
const char *lnk;
lnk = strjoina(dir, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
mkdir_parents(lnk, 0755);
if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0)
return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
} else {
_cleanup_free_ char *_fsck = NULL;
const char *fsck;
if (in_initrd() && path_equal(where, "/sysroot")) {
r = write_fsck_sysroot_service(dir, what);
if (r < 0)
return r;
fsck = "systemd-fsck-root.service";
} else {
r = unit_name_from_path_instance("systemd-fsck", what, ".service", &_fsck);
if (r < 0)
return log_error_errno(r, "Failed to create fsck service name: %m");
fsck = _fsck;
}
fprintf(f,
"Requires=%1$s\n"
"After=%1$s\n",
fsck);
}
return 0;
}
int generator_write_timeouts(
const char *dir,
const char *what,
const char *where,
const char *opts,
char **filtered) {
/* Allow configuration how long we wait for a device that
* backs a mount point to show up. This is useful to support
* endless device timeouts for devices that show up only after
* user input, like crypto devices. */
_cleanup_free_ char *node = NULL, *unit = NULL, *timeout = NULL;
usec_t u;
int r;
r = fstab_filter_options(opts, "comment=systemd.device-timeout\0"
"x-systemd.device-timeout\0",
NULL, &timeout, filtered);
if (r <= 0)
return r;
r = parse_sec_fix_0(timeout, &u);
if (r < 0) {
log_warning("Failed to parse timeout for %s, ignoring: %s", where, timeout);
return 0;
}
node = fstab_node_to_udev_node(what);
if (!node)
return log_oom();
if (!is_device_path(node)) {
log_warning("x-systemd.device-timeout ignored for %s", what);
return 0;
}
r = unit_name_from_path(node, ".device", &unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit name from path: %m");
return write_drop_in_format(dir, unit, 50, "device-timeout",
"# Automatically generated by %s\n\n"
"[Unit]\n"
"JobRunningTimeoutSec=%s",
program_invocation_short_name,
timeout);
}
int generator_write_device_deps(
const char *dir,
const char *what,
const char *where,
const char *opts) {
/* fstab records that specify _netdev option should apply the network
* ordering on the actual device depending on network connection. If we
* are not mounting real device (NFS, CIFS), we rely on _netdev effect
* on the mount unit itself. */
_cleanup_free_ char *node = NULL, *unit = NULL;
int r;
if (!fstab_test_option(opts, "_netdev\0"))
return 0;
node = fstab_node_to_udev_node(what);
if (!node)
return log_oom();
/* Nothing to apply dependencies to. */
if (!is_device_path(node))
return 0;
r = unit_name_from_path(node, ".device", &unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
node);
/* See mount_add_default_dependencies for explanation why we create such
* dependencies. */
return write_drop_in_format(dir, unit, 50, "netdev-dependencies",
"# Automatically generated by %s\n\n"
"[Unit]\n"
"After=" SPECIAL_NETWORK_ONLINE_TARGET " " SPECIAL_NETWORK_TARGET "\n"
"Wants=" SPECIAL_NETWORK_ONLINE_TARGET "\n",
program_invocation_short_name);
}
int generator_write_initrd_root_device_deps(const char *dir, const char *what) {
_cleanup_free_ char *unit = NULL;
int r;
r = unit_name_from_path(what, ".device", &unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
what);
return write_drop_in_format(dir, SPECIAL_INITRD_ROOT_DEVICE_TARGET, 50, "root-device",
"# Automatically generated by %s\n\n"
"[Unit]\n"
"Requires=%s\n"
"After=%s",
program_invocation_short_name,
unit,
unit);
}
int generator_hook_up_mkswap(
const char *dir,
const char *what) {
_cleanup_free_ char *node = NULL, *unit = NULL, *escaped = NULL, *where_unit = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *unit_file;
int r;
node = fstab_node_to_udev_node(what);
if (!node)
return log_oom();
/* Nothing to work on. */
if (!is_device_path(node)) {
log_error("Cannot format something that is not a device node: %s", node);
return -EINVAL;
}
r = unit_name_from_path_instance("systemd-mkswap", node, ".service", &unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
node);
unit_file = strjoina(dir, "/", unit);
log_debug("Creating %s", unit_file);
escaped = cescape(node);
if (!escaped)
return log_oom();
r = unit_name_from_path(what, ".swap", &where_unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
what);
f = fopen(unit_file, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m",
unit_file);
fprintf(f,
"# Automatically generated by %s\n\n"
"[Unit]\n"
"Description=Make Swap on %%f\n"
"Documentation=man:systemd-mkswap@.service(8)\n"
"DefaultDependencies=no\n"
"BindsTo=%%i.device\n"
"After=%%i.device\n"
"Before=%s\n"
"Before=shutdown.target\n"
"\n"
"[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"ExecStart="SYSTEMD_MAKEFS_PATH " swap %s\n"
"TimeoutSec=0\n",
program_invocation_short_name,
where_unit,
escaped);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write unit file %s: %m", unit_file);
return generator_add_symlink(dir, where_unit, "requires", unit);
}
int generator_hook_up_mkfs(
const char *dir,
const char *what,
const char *where,
const char *type) {
_cleanup_free_ char *node = NULL, *unit = NULL, *escaped = NULL, *where_unit = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *unit_file;
int r;
node = fstab_node_to_udev_node(what);
if (!node)
return log_oom();
/* Nothing to work on. */
if (!is_device_path(node)) {
log_error("Cannot format something that is not a device node: %s", node);
return -EINVAL;
}
if (!type || streq(type, "auto")) {
log_error("Cannot format partition %s, filesystem type is not specified", node);
return -EINVAL;
}
r = unit_name_from_path_instance("systemd-mkfs", node, ".service", &unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
node);
unit_file = strjoina(dir, "/", unit);
log_debug("Creating %s", unit_file);
escaped = cescape(node);
if (!escaped)
return log_oom();
r = unit_name_from_path(where, ".mount", &where_unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
where);
f = fopen(unit_file, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m",
unit_file);
fprintf(f,
"# Automatically generated by %s\n\n"
"[Unit]\n"
"Description=Make File System on %%f\n"
"Documentation=man:systemd-mkfs@.service(8)\n"
"DefaultDependencies=no\n"
"BindsTo=%%i.device\n"
"After=%%i.device\n"
/* fsck might or might not be used, so let's be safe and order
* ourselves before both systemd-fsck@.service and the mount unit. */
"Before=systemd-fsck@%%i.service\n"
"Before=%s\n"
"Before=shutdown.target\n"
"\n"
"[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"ExecStart="SYSTEMD_MAKEFS_PATH " %s %s\n"
"TimeoutSec=0\n",
program_invocation_short_name,
where_unit,
type,
escaped);
// XXX: what about local-fs-pre.target?
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write unit file %s: %m", unit_file);
return generator_add_symlink(dir, where_unit, "requires", unit);
}
int generator_hook_up_growfs(
const char *dir,
const char *where,
const char *target) {
_cleanup_free_ char *unit = NULL, *escaped = NULL, *where_unit = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *unit_file;
int r;
escaped = cescape(where);
if (!escaped)
return log_oom();
r = unit_name_from_path_instance("systemd-growfs", where, ".service", &unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit instance name from path \"%s\": %m",
where);
r = unit_name_from_path(where, ".mount", &where_unit);
if (r < 0)
return log_error_errno(r, "Failed to make unit name from path \"%s\": %m",
where);
unit_file = strjoina(dir, "/", unit);
log_debug("Creating %s", unit_file);
f = fopen(unit_file, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m",
unit_file);
fprintf(f,
"# Automatically generated by %s\n\n"
"[Unit]\n"
"Description=Grow File System on %%f\n"
"Documentation=man:systemd-growfs@.service(8)\n"
"DefaultDependencies=no\n"
"BindsTo=%%i.mount\n"
"After=%%i.mount\n"
"Before=shutdown.target\n"
"Before=%s\n"
"\n"
"[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"ExecStart="SYSTEMD_GROWFS_PATH " %s\n"
"TimeoutSec=0\n",
program_invocation_short_name,
target,
escaped);
return generator_add_symlink(dir, where_unit, "wants", unit);
}