561 lines
16 KiB
C
561 lines
16 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 <stdio.h>
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#include <mntent.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#include "log.h"
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#include "util.h"
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#include "unit-name.h"
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#include "path-util.h"
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#include "mount-setup.h"
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#include "special.h"
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#include "mkdir.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_enabled = true;
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static int device_name(const char *path, char **unit) {
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char *p;
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assert(path);
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if (!is_device_path(path))
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return 0;
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p = unit_name_from_path(path, ".device");
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if (!p)
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return log_oom();
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*unit = p;
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return 1;
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}
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static int mount_find_pri(struct mntent *me, int *ret) {
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char *end, *pri;
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unsigned long r;
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assert(me);
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assert(ret);
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pri = hasmntopt(me, "pri");
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if (!pri)
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return 0;
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pri += 4;
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errno = 0;
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r = strtoul(pri, &end, 10);
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if (errno != 0)
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return -errno;
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if (end == pri || (*end != ',' && *end != 0))
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return -EINVAL;
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*ret = (int) r;
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return 1;
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}
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static int add_swap(const char *what, struct mntent *me) {
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char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL;
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FILE *f = NULL;
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bool noauto, nofail;
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int r, pri = -1;
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assert(what);
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assert(me);
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r = mount_find_pri(me, &pri);
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if (r < 0) {
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log_error("Failed to parse priority");
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return pri;
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}
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noauto = !!hasmntopt(me, "noauto");
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nofail = !!hasmntopt(me, "nofail");
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name = unit_name_from_path(what, ".swap");
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if (!name) {
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r = log_oom();
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goto finish;
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}
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unit = strjoin(arg_dest, "/", name, NULL);
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if (!unit) {
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r = log_oom();
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goto finish;
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}
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f = fopen(unit, "wxe");
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if (!f) {
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r = -errno;
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log_error("Failed to create unit file: %m");
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goto finish;
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}
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fputs("# 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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"DefaultDependencies=no\n"
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"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
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"Before=" SPECIAL_UMOUNT_TARGET "\n", f);
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if (!noauto && !nofail)
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fputs("Before=" SPECIAL_SWAP_TARGET "\n", f);
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fprintf(f,
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"\n"
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"[Swap]\n"
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"What=%s\n",
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what);
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if (pri >= 0)
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fprintf(f,
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"Priority=%i\n",
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pri);
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fflush(f);
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if (ferror(f)) {
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log_error("Failed to write unit file: %m");
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r = -errno;
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goto finish;
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}
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if (!noauto) {
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lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL);
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if (!lnk) {
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r = log_oom();
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goto finish;
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}
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mkdir_parents_label(lnk, 0755);
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if (symlink(unit, lnk) < 0) {
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log_error("Failed to create symlink: %m");
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r = -errno;
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goto finish;
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}
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r = device_name(what, &device);
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if (r < 0)
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goto finish;
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if (r > 0) {
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free(lnk);
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lnk = strjoin(arg_dest, "/", device, ".wants/", name, NULL);
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if (!lnk) {
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r = log_oom();
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goto finish;
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}
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mkdir_parents_label(lnk, 0755);
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if (symlink(unit, lnk) < 0) {
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log_error("Failed to create symlink: %m");
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r = -errno;
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goto finish;
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}
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}
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}
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r = 0;
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finish:
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if (f)
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fclose(f);
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free(unit);
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free(lnk);
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free(name);
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free(device);
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return r;
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}
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static bool mount_is_bind(struct mntent *me) {
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assert(me);
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return
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hasmntopt(me, "bind") ||
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streq(me->mnt_opts, "bind");
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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
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hasmntopt(me, "_netdev") ||
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fstype_is_network(me->mnt_type);
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}
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static int add_mount(const char *what, const char *where, struct mntent *me) {
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char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL, *automount_name = NULL, *automount_unit = NULL;
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FILE *f = NULL;
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bool noauto, nofail, automount, isbind, isnetwork;
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int r;
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const char *post, *pre;
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assert(what);
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assert(where);
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assert(me);
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if (streq(me->mnt_type, "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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isnetwork = mount_is_network(me);
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isbind = mount_is_bind(me);
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noauto = !!hasmntopt(me, "noauto");
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nofail = !!hasmntopt(me, "nofail");
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automount =
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hasmntopt(me, "comment=systemd.automount") ||
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hasmntopt(me, "x-systemd.automount");
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if (isnetwork) {
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post = SPECIAL_REMOTE_FS_TARGET;
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pre = SPECIAL_REMOTE_FS_PRE_TARGET;
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} else {
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post = SPECIAL_LOCAL_FS_TARGET;
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pre = SPECIAL_LOCAL_FS_PRE_TARGET;
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}
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name = unit_name_from_path(where, ".mount");
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if (!name) {
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r = log_oom();
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goto finish;
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}
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unit = strjoin(arg_dest, "/", name, NULL);
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if (!unit) {
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r = log_oom();
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goto finish;
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}
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f = fopen(unit, "wxe");
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if (!f) {
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r = -errno;
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log_error("Failed to create unit file: %m");
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goto finish;
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}
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fputs("# 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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"DefaultDependencies=no\n", f);
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if (!path_equal(where, "/"))
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fprintf(f,
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"After=%s\n"
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"Wants=%s\n"
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"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
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"Before=" SPECIAL_UMOUNT_TARGET "\n",
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pre,
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pre);
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if (!noauto && !nofail && !automount)
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fprintf(f,
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"Before=%s\n",
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post);
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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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"Type=%s\n"
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"FsckPassNo=%i\n",
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what,
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where,
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me->mnt_type,
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me->mnt_passno);
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if (!isempty(me->mnt_opts) &&
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!streq(me->mnt_opts, "defaults"))
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fprintf(f,
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"Options=%s\n",
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me->mnt_opts);
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fflush(f);
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if (ferror(f)) {
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log_error("Failed to write unit file: %m");
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r = -errno;
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goto finish;
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}
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if (!noauto) {
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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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r = log_oom();
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goto finish;
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}
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mkdir_parents_label(lnk, 0755);
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if (symlink(unit, lnk) < 0) {
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log_error("Failed to create symlink: %m");
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r = -errno;
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goto finish;
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}
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if (!isbind &&
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!path_equal(where, "/")) {
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r = device_name(what, &device);
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if (r < 0)
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goto finish;
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if (r > 0) {
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free(lnk);
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lnk = strjoin(arg_dest, "/", device, ".wants/", name, NULL);
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if (!lnk) {
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r = log_oom();
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goto finish;
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}
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mkdir_parents_label(lnk, 0755);
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if (symlink(unit, lnk) < 0) {
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log_error("Failed to create symlink: %m");
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r = -errno;
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goto finish;
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}
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}
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}
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}
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if (automount && !path_equal(where, "/")) {
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automount_name = unit_name_from_path(where, ".automount");
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if (!name) {
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r = log_oom();
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goto finish;
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}
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automount_unit = strjoin(arg_dest, "/", automount_name, NULL);
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if (!automount_unit) {
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r = log_oom();
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goto finish;
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}
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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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r = -errno;
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log_error("Failed to create unit file: %m");
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goto finish;
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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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"DefaultDependencies=no\n"
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"Conflicts=" SPECIAL_UMOUNT_TARGET "\n"
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"Before=" SPECIAL_UMOUNT_TARGET " %s\n"
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"\n"
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"[Automount]\n"
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"Where=%s\n",
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post,
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where);
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fflush(f);
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if (ferror(f)) {
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log_error("Failed to write unit file: %m");
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r = -errno;
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goto finish;
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}
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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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r = log_oom();
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goto finish;
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}
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mkdir_parents_label(lnk, 0755);
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if (symlink(automount_unit, lnk) < 0) {
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log_error("Failed to create symlink: %m");
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r = -errno;
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goto finish;
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}
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}
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r = 0;
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finish:
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if (f)
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fclose(f);
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free(unit);
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free(lnk);
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free(name);
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free(device);
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free(automount_name);
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free(automount_unit);
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return r;
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}
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static int parse_fstab(void) {
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FILE *f;
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int r = 0;
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struct mntent *me;
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errno = 0;
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f = setmntent("/etc/fstab", "r");
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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("Failed to open /etc/fstab: %m");
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return -errno;
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}
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while ((me = getmntent(f))) {
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char *where, *what;
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int k;
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what = fstab_node_to_udev_node(me->mnt_fsname);
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if (!what) {
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r = log_oom();
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goto finish;
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}
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where = strdup(me->mnt_dir);
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if (!where) {
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r = log_oom();
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free(what);
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goto finish;
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}
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if (is_path(where))
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path_kill_slashes(where);
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log_debug("Found entry what=%s where=%s type=%s", what, where, me->mnt_type);
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if (streq(me->mnt_type, "swap"))
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k = add_swap(what, me);
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else
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k = add_mount(what, where, me);
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free(what);
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free(where);
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if (k < 0)
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r = k;
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}
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finish:
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endmntent(f);
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return r;
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}
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static int parse_proc_cmdline(void) {
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char *line, *w, *state;
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int r;
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size_t l;
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if (detect_container(NULL) > 0)
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return 0;
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r = read_one_line_file("/proc/cmdline", &line);
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if (r < 0) {
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log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
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return 0;
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}
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FOREACH_WORD_QUOTED(w, l, line, state) {
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char *word;
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word = strndup(w, l);
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if (!word) {
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r = log_oom();
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goto finish;
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}
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if (startswith(word, "fstab=")) {
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r = parse_boolean(word + 6);
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if (r < 0)
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log_warning("Failed to parse fstab switch %s. Ignoring.", word + 6);
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else
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arg_enabled = r;
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} else if (startswith(word, "rd.fstab=")) {
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if (in_initrd()) {
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r = parse_boolean(word + 6);
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if (r < 0)
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log_warning("Failed to parse fstab switch %s. Ignoring.", word + 6);
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else
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arg_enabled = r;
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}
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} else if (startswith(word, "fstab.") ||
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(in_initrd() && startswith(word, "rd.fstab."))) {
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log_warning("Unknown kernel switch %s. Ignoring.", word);
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}
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free(word);
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}
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r = 0;
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finish:
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free(line);
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return r;
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}
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int main(int argc, char *argv[]) {
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int r;
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if (argc > 1 && argc != 4) {
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log_error("This program takes three or no arguments.");
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return EXIT_FAILURE;
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}
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if (argc > 1)
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arg_dest = argv[1];
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log_set_target(LOG_TARGET_SAFE);
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log_parse_environment();
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log_open();
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umask(0022);
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if (parse_proc_cmdline() < 0)
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return EXIT_FAILURE;
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if (!arg_enabled)
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return EXIT_SUCCESS;
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r = parse_fstab();
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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