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:[email protected](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);
}
static int add_swap(
const char *what,
struct mntent *me,
bool noauto,
bool nofail) {
_cleanup_free_ char *name = NULL, *unit = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(what);
assert(me);
if (access("/proc/swaps", F_OK) < 0) {
log_info("Swap not supported, ignoring fstab swap entry for %s.", what);
return 0;
}
if (detect_container() > 0) {
log_info("Running in a container, ignoring fstab swap entry for %s.", what);
return 0;
}
r = unit_name_from_path(what, ".swap", &name);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
unit = strjoin(arg_dest, "/", name);
if (!unit)
return log_oom();
f = fopen(unit, "wxe");
if (!f)
return log_error_errno(errno,
errno == EEXIST ?
"Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?" :
"Failed to create unit file %s: %m",
unit);
fputs_unlocked("# Automatically generated by systemd-fstab-generator\n\n"
"[Unit]\n"
"SourcePath=/etc/fstab\n"
"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n"
"[Swap]\n", f);
r = write_what(f, what);
if (r < 0)
return r;
r = write_options(f, me->mnt_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", unit);
/* use what as where, to have a nicer error message */
r = generator_write_timeouts(arg_dest, what, what, me->mnt_opts, NULL);
if (r < 0)
return r;
if (!noauto) {
r = generator_add_symlink(arg_dest, SPECIAL_SWAP_TARGET,
nofail ? "wants" : "requires", name);
if (r < 0)
return r;
}
return 0;
}
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:[email protected](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 [email protected] 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_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:[email protected](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);
}
static int add_swap(
const char *what,
struct mntent *me,
MountpointFlags flags) {
_cleanup_free_ char *name = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
assert(what);
assert(me);
if (access("/proc/swaps", F_OK) < 0) {
log_info("Swap not supported, ignoring fstab swap entry for %s.", what);
return 0;
}
if (detect_container() > 0) {
log_info("Running in a container, ignoring fstab swap entry for %s.", what);
return 0;
}
r = unit_name_from_path(what, ".swap", &name);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
r = generator_open_unit_file(arg_dest, "/etc/fstab", name, &f);
if (r < 0)
return r;
fputs("# Automatically generated by systemd-fstab-generator\n\n"
"[Unit]\n"
"SourcePath=/etc/fstab\n"
"Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n"
"[Swap]\n", f);
r = write_what(f, what);
if (r < 0)
return r;
r = write_options(f, me->mnt_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", name);
/* use what as where, to have a nicer error message */
r = generator_write_timeouts(arg_dest, what, what, me->mnt_opts, NULL);
if (r < 0)
return r;
if (flags & MAKEFS) {
r = generator_hook_up_mkswap(arg_dest, what);
if (r < 0)
return r;
}
if (flags & GROWFS)
/* TODO: swap devices must be wiped and recreated */
log_warning("%s: growing swap devices is currently unsupported.", what);
if (!(flags & NOAUTO)) {
r = generator_add_symlink(arg_dest, SPECIAL_SWAP_TARGET,
(flags & NOFAIL) ? "wants" : "requires", name);
if (r < 0)
return r;
}
return 0;
}
static int create_disk(
const char *name,
const char *device,
const char *password,
const char *options) {
_cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *e = NULL,
*filtered = NULL, *u_escaped = NULL, *password_escaped = NULL, *filtered_escaped = NULL, *name_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *dmname;
bool noauto, nofail, tmp, swap, netdev;
int r;
assert(name);
assert(device);
noauto = fstab_test_yes_no_option(options, "noauto\0" "auto\0");
nofail = fstab_test_yes_no_option(options, "nofail\0" "fail\0");
tmp = fstab_test_option(options, "tmp\0");
swap = fstab_test_option(options, "swap\0");
netdev = fstab_test_option(options, "_netdev\0");
if (tmp && swap) {
log_error("Device '%s' cannot be both 'tmp' and 'swap'. Ignoring.", name);
return -EINVAL;
}
name_escaped = specifier_escape(name);
if (!name_escaped)
return log_oom();
e = unit_name_escape(name);
if (!e)
return log_oom();
r = unit_name_build("systemd-cryptsetup", e, ".service", &n);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
p = strjoin(arg_dest, "/", n);
if (!p)
return log_oom();
u = fstab_node_to_udev_node(device);
if (!u)
return log_oom();
u_escaped = specifier_escape(u);
if (!u_escaped)
return log_oom();
r = unit_name_from_path(u, ".device", &d);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
password_escaped = specifier_escape(password);
if (!password_escaped)
return log_oom();
f = fopen(p, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m", p);
fprintf(f,
"# Automatically generated by systemd-cryptsetup-generator\n\n"
"[Unit]\n"
"Description=Cryptography Setup for %%I\n"
"Documentation=man:crypttab(5) man:systemd-cryptsetup-generator(8) man:[email protected](8)\n"
"SourcePath=/etc/crypttab\n"
"DefaultDependencies=no\n"
"Conflicts=umount.target\n"
"IgnoreOnIsolate=true\n"
"After=%s\n",
netdev ? "remote-fs-pre.target" : "cryptsetup-pre.target");
if (!nofail)
fprintf(f,
"Before=%s\n",
netdev ? "remote-cryptsetup.target" : "cryptsetup.target");
if (password) {
if (STR_IN_SET(password, "/dev/urandom", "/dev/random", "/dev/hw_random"))
fputs_unlocked("After=systemd-random-seed.service\n", f);
else if (!STR_IN_SET(password, "-", "none")) {
_cleanup_free_ char *uu;
uu = fstab_node_to_udev_node(password);
if (!uu)
return log_oom();
if (!path_equal(uu, "/dev/null")) {
if (path_startswith(uu, "/dev/")) {
_cleanup_free_ char *dd = NULL;
r = unit_name_from_path(uu, ".device", &dd);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
fprintf(f, "After=%1$s\nRequires=%1$s\n", dd);
} else
fprintf(f, "RequiresMountsFor=%s\n", password_escaped);
}
}
}
if (path_startswith(u, "/dev/")) {
fprintf(f,
"BindsTo=%s\n"
"After=%s\n"
"Before=umount.target\n",
d, d);
if (swap)
fputs_unlocked("Before=dev-mapper-%i.swap\n",
f);
} else
fprintf(f,
"RequiresMountsFor=%s\n",
u_escaped);
r = generator_write_timeouts(arg_dest, device, name, options, &filtered);
if (r < 0)
return r;
filtered_escaped = specifier_escape(filtered);
if (!filtered_escaped)
return log_oom();
fprintf(f,
"\n[Service]\n"
"Type=oneshot\n"
"RemainAfterExit=yes\n"
"TimeoutSec=0\n" /* the binary handles timeouts anyway */
"KeyringMode=shared\n" /* make sure we can share cached keys among instances */
"ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
"ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
name_escaped, u_escaped, strempty(password_escaped), strempty(filtered_escaped),
name_escaped);
if (tmp)
fprintf(f,
"ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
name_escaped);
if (swap)
fprintf(f,
"ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
name_escaped);
r = fflush_and_check(f);
if (r < 0)
return log_error_errno(r, "Failed to write file %s: %m", p);
if (!noauto) {
r = generator_add_symlink(arg_dest, d, "wants", n);
if (r < 0)
return r;
r = generator_add_symlink(arg_dest,
netdev ? "remote-cryptsetup.target" : "cryptsetup.target",
nofail ? "wants" : "requires", n);
if (r < 0)
return r;
}
dmname = strjoina("dev-mapper-", e, ".device");
r = generator_add_symlink(arg_dest, dmname, "requires", n);
if (r < 0)
return r;
if (!noauto && !nofail) {
r = write_drop_in(arg_dest, dmname, 90, "device-timeout",
"# Automatically generated by systemd-cryptsetup-generator \n\n"
"[Unit]\nJobTimeoutSec=0");
if (r < 0)
return log_error_errno(r, "Failed to write device drop-in: %m");
}
return 0;
}
