fstab-generator.c revision a6903061530cac5fbaa99a080a93221c02c349f9
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2012 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <mntent.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "log.h"
#include "util.h"
#include "unit-name.h"
#include "path-util.h"
#include "mount-setup.h"
#include "special.h"
#include "mkdir.h"
static const char *arg_dest = "/tmp";
static int device_name(const char *path, char **unit) {
char *p;
assert(path);
if (!is_device_path(path))
return 0;
p = unit_name_from_path(path, ".device");
if (!p)
return -ENOMEM;
*unit = p;
return 1;
}
static int mount_find_pri(struct mntent *me, int *ret) {
char *end, *pri;
unsigned long r;
assert(me);
assert(ret);
pri = hasmntopt(me, "pri");
if (!pri)
return 0;
pri += 4;
errno = 0;
r = strtoul(pri, &end, 10);
if (errno != 0)
return -errno;
if (end == pri || (*end != ',' && *end != 0))
return -EINVAL;
*ret = (int) r;
return 1;
}
static int add_swap(const char *what, struct mntent *me) {
char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL;
FILE *f = NULL;
bool noauto, nofail;
int r, pri = -1;
assert(what);
assert(me);
r = mount_find_pri(me, &pri);
if (r < 0) {
log_error("Failed to parse priority");
return pri;
}
noauto = !!hasmntopt(me, "noauto");
nofail = !!hasmntopt(me, "nofail");
name = unit_name_from_path(what, ".swap");
if (!name) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
unit = join(arg_dest, "/", name, NULL);
if (!unit) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
f = fopen(unit, "wxe");
if (!f) {
r = -errno;
log_error("Failed to create unit file: %m");
goto finish;
}
fputs("# Automatically generated by systemd-fstab-generator\n\n"
"[Unit]\n"
"DefaultDependencies=no\n"
"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
"Before=" SPECIAL_UMOUNT_TARGET "\n", f);
if (!noauto && !nofail)
fputs("Before=" SPECIAL_SWAP_TARGET "\n", f);
fprintf(f,
"\n"
"[Swap]\n"
"What=%s\n",
what);
if (pri >= 0)
fprintf(f,
"Priority=%i\n",
pri);
fflush(f);
if (ferror(f)) {
log_error("Failed to write unit file: %m");
r = -errno;
goto finish;
}
if (!noauto) {
lnk = join(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
if (!lnk) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
mkdir_parents(lnk, 0755);
if (symlink(unit, lnk) < 0) {
log_error("Failed to create symlink: %m");
r = -errno;
goto finish;
}
r = device_name(what, &device);
if (r < 0) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
if (r > 0) {
free(lnk);
lnk = join(arg_dest, "/", device, ".wants/", name, NULL);
if (!lnk) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
mkdir_parents(lnk, 0755);
if (symlink(unit, lnk) < 0) {
log_error("Failed to create symlink: %m");
r = -errno;
goto finish;
}
}
}
r = 0;
finish:
if (f)
fclose(f);
free(unit);
free(lnk);
free(name);
free(device);
return r;
}
static bool mount_is_bind(struct mntent *me) {
assert(me);
return
hasmntopt(me, "bind") ||
streq(me->mnt_opts, "bind");
}
static bool mount_is_network(struct mntent *me) {
assert(me);
return
hasmntopt(me, "_netdev") ||
fstype_is_network(me->mnt_type);
}
static int add_mount(const char *what, const char *where, struct mntent *me) {
char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL, *automount_name = NULL, *automount_unit = NULL;
FILE *f = NULL;
bool noauto, nofail, automount, isbind, isnetwork;
int r;
const char *post, *pre;
assert(what);
assert(where);
assert(me);
if (streq(me->mnt_type, "autofs"))
return 0;
if (!is_path(where)) {
log_warning("Mount point %s is not a valid path, ignoring.", where);
return 0;
}
if (mount_point_is_api(where) ||
mount_point_ignore(where))
return 0;
isnetwork = mount_is_network(me);
isbind = mount_is_bind(me);
noauto = !!hasmntopt(me, "noauto");
nofail = !!hasmntopt(me, "nofail");
automount =
hasmntopt(me, "comment=systemd.automount") ||
hasmntopt(me, "x-systemd.automount");
if (isnetwork) {
post = SPECIAL_REMOTE_FS_TARGET;
pre = SPECIAL_REMOTE_FS_PRE_TARGET;
} else {
post = SPECIAL_LOCAL_FS_TARGET;
pre = SPECIAL_LOCAL_FS_PRE_TARGET;
}
name = unit_name_from_path(where, ".mount");
if (!name) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
unit = join(arg_dest, "/", name, NULL);
if (!unit) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
f = fopen(unit, "wxe");
if (!f) {
r = -errno;
log_error("Failed to create unit file: %m");
goto finish;
}
fputs("# Automatically generated by systemd-fstab-generator\n\n"
"[Unit]\n"
"DefaultDependencies=no\n", f);
if (!path_equal(where, "/"))
fprintf(f,
"After=%s\n"
"Wants=%s\n"
"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
"Before=" SPECIAL_UMOUNT_TARGET "\n",
pre,
pre);
if (!noauto && !nofail && !automount)
fprintf(f,
"Before=%s\n",
post);
fprintf(f,
"\n"
"[Mount]\n"
"What=%s\n"
"Where=%s\n"
"Type=%s\n"
"FsckPassNo=%i\n",
what,
where,
me->mnt_type,
me->mnt_passno);
if (!isempty(me->mnt_opts) &&
!streq(me->mnt_opts, "defaults"))
fprintf(f,
"Options=%s\n",
me->mnt_opts);
fflush(f);
if (ferror(f)) {
log_error("Failed to write unit file: %m");
r = -errno;
goto finish;
}
if (!noauto) {
lnk = join(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL);
if (!lnk) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
mkdir_parents(lnk, 0755);
if (symlink(unit, lnk) < 0) {
log_error("Failed to create symlink: %m");
r = -errno;
goto finish;
}
if (!isbind &&
!path_equal(where, "/")) {
r = device_name(what, &device);
if (r < 0) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
if (r > 0) {
free(lnk);
lnk = join(arg_dest, "/", device, ".wants/", name, NULL);
if (!lnk) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
mkdir_parents(lnk, 0755);
if (symlink(unit, lnk) < 0) {
log_error("Failed to creat symlink: %m");
r = -errno;
goto finish;
}
}
}
}
if (automount && !path_equal(where, "/")) {
automount_name = unit_name_from_path(where, ".automount");
if (!name) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
automount_unit = join(arg_dest, "/", automount_name, NULL);
if (!automount_unit) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
fclose(f);
f = fopen(automount_unit, "wxe");
if (!f) {
r = -errno;
log_error("Failed to create unit file: %m");
goto finish;
}
fprintf(f,
"# Automatically generated by systemd-fstab-generator\n\n"
"[Unit]\n"
"DefaultDependencies=no\n"
"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
"Before=" SPECIAL_UMOUNT_TARGET " %s\n"
"\n"
"[Automount]\n"
"Where=%s\n",
post,
where);
fflush(f);
if (ferror(f)) {
log_error("Failed to write unit file: %m");
r = -errno;
goto finish;
}
free(lnk);
lnk = join(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL);
if (!lnk) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
mkdir_parents(lnk, 0755);
if (symlink(automount_unit, lnk) < 0) {
log_error("Failed to create symlink: %m");
r = -errno;
goto finish;
}
}
r = 0;
finish:
if (f)
fclose(f);
free(unit);
free(lnk);
free(name);
free(device);
free(automount_name);
free(automount_unit);
return r;
}
static int parse_fstab(void) {
FILE *f;
int r = 0;
struct mntent *me;
errno = 0;
f = setmntent("/etc/fstab", "r");
if (!f) {
if (errno == ENOENT)
return 0;
log_error("Failed to open /etc/fstab: %m");
return -errno;
}
while ((me = getmntent(f))) {
char *where, *what;
int k;
what = fstab_node_to_udev_node(me->mnt_fsname);
if (!what) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
where = strdup(me->mnt_dir);
if (!where) {
log_error("Out of memory");
free(what);
r = -ENOMEM;
goto finish;
}
if (is_path(what))
path_kill_slashes(what);
if (is_path(where))
path_kill_slashes(where);
log_debug("Found entry what=%s where=%s type=%s", what, where, me->mnt_type);
if (streq(me->mnt_type, "swap"))
k = add_swap(what, me);
else
k = add_mount(what, where, me);
free(what);
free(where);
if (k < 0)
r = k;
}
finish:
endmntent(f);
return r;
}
int main(int argc, char *argv[]) {
int r;
if (argc > 2) {
log_error("This program takes one or no arguments.");
return EXIT_FAILURE;
}
if (argc > 1)
arg_dest = argv[1];
log_set_target(LOG_TARGET_SAFE);
log_parse_environment();
log_open();
log_set_max_level(LOG_DEBUG);
umask(0022);
r = parse_fstab();
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}