98bad05e75
Let's always escape strings we receive from the user before writing them out to unit file settings that suppor specifier expansion, so that user strings are transported as-is.
280 lines
9.6 KiB
C
280 lines
9.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2014 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 <errno.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "dropin.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "fileio.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 "macro.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "special.h"
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#include "specifier.h"
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#include "string-util.h"
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#include "time-util.h"
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#include "unit-name.h"
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#include "util.h"
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int generator_add_symlink(const char *root, const char *dst, const char *dep_type, const char *src) {
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/* Adds a symlink from <dst>.<dep_type>.d/ to ../<src> */
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const char *from, *to;
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from = strjoina("../", src);
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to = strjoina(root, "/", dst, ".", dep_type, "/", src);
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mkdir_parents_label(to, 0755);
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if (symlink(from, to) < 0)
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if (errno != EEXIST)
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return log_error_errno(errno, "Failed to create symlink \"%s\": %m", to);
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return 0;
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}
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static int write_fsck_sysroot_service(const char *dir, const char *what) {
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_cleanup_free_ char *device = NULL, *escaped = NULL, *escaped2 = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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const char *unit;
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int r;
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escaped = specifier_escape(what);
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if (!escaped)
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return log_oom();
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escaped2 = cescape(escaped);
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if (!escaped2)
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return log_oom();
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unit = strjoina(dir, "/systemd-fsck-root.service");
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log_debug("Creating %s", unit);
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r = unit_name_from_path(what, ".device", &device);
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if (r < 0)
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return log_error_errno(r, "Failed to convert device \"%s\" to unit name: %m", what);
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f = fopen(unit, "wxe");
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if (!f)
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return log_error_errno(errno, "Failed to create unit file %s: %m", unit);
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fprintf(f,
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"# Automatically generated by %1$s\n\n"
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"[Unit]\n"
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"Documentation=man:systemd-fsck-root.service(8)\n"
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"Description=File System Check on %2$s\n"
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"DefaultDependencies=no\n"
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"BindsTo=%3$s\n"
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"After=initrd-root-device.target local-fs-pre.target %3$s\n"
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"Before=shutdown.target\n"
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"\n"
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"[Service]\n"
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"Type=oneshot\n"
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"RemainAfterExit=yes\n"
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"ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
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"TimeoutSec=0\n",
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program_invocation_short_name,
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escaped,
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device,
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escaped2);
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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", unit);
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return 0;
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}
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int generator_write_fsck_deps(
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FILE *f,
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const char *dir,
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const char *what,
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const char *where,
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const char *fstype) {
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int r;
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assert(f);
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assert(dir);
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assert(what);
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assert(where);
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if (!is_device_path(what)) {
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log_warning("Checking was requested for \"%s\", but it is not a device.", what);
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return 0;
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}
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if (!isempty(fstype) && !streq(fstype, "auto")) {
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r = fsck_exists(fstype);
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if (r < 0)
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log_warning_errno(r, "Checking was requested for %s, but couldn't detect if fsck.%s may be used, proceeding: %m", what, fstype);
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else if (r == 0) {
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/* treat missing check as essentially OK */
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log_debug("Checking was requested for %s, but fsck.%s does not exist.", what, fstype);
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return 0;
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}
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}
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if (path_equal(where, "/")) {
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const char *lnk;
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lnk = strjoina(dir, "/" SPECIAL_LOCAL_FS_TARGET ".wants/systemd-fsck-root.service");
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mkdir_parents(lnk, 0755);
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if (symlink(SYSTEM_DATA_UNIT_PATH "/systemd-fsck-root.service", lnk) < 0)
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return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
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} else {
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_cleanup_free_ char *_fsck = NULL;
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const char *fsck;
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if (in_initrd() && path_equal(where, "/sysroot")) {
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r = write_fsck_sysroot_service(dir, what);
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if (r < 0)
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return r;
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fsck = "systemd-fsck-root.service";
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} else {
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r = unit_name_from_path_instance("systemd-fsck", what, ".service", &_fsck);
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if (r < 0)
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return log_error_errno(r, "Failed to create fsck service name: %m");
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fsck = _fsck;
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}
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fprintf(f,
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"Requires=%1$s\n"
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"After=%1$s\n",
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fsck);
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}
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return 0;
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}
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int generator_write_timeouts(
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const char *dir,
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const char *what,
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const char *where,
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const char *opts,
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char **filtered) {
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/* Allow configuration how long we wait for a device that
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* backs a mount point to show up. This is useful to support
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* endless device timeouts for devices that show up only after
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* user input, like crypto devices. */
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_cleanup_free_ char *node = NULL, *unit = NULL, *timeout = NULL;
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usec_t u;
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int r;
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r = fstab_filter_options(opts, "comment=systemd.device-timeout\0"
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"x-systemd.device-timeout\0",
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NULL, &timeout, filtered);
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if (r <= 0)
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return r;
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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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node = fstab_node_to_udev_node(what);
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if (!node)
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return log_oom();
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if (!is_device_path(node)) {
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log_warning("x-systemd.device-timeout ignored for %s", what);
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return 0;
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}
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r = unit_name_from_path(node, ".device", &unit);
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if (r < 0)
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return log_error_errno(r, "Failed to make unit name from path: %m");
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return write_drop_in_format(dir, unit, 50, "device-timeout",
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"# Automatically generated by %s\n\n"
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"[Unit]\n"
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"JobRunningTimeoutSec=%s",
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program_invocation_short_name,
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timeout);
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}
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int generator_write_device_deps(
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const char *dir,
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const char *what,
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const char *where,
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const char *opts) {
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/* fstab records that specify _netdev option should apply the network
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* ordering on the actual device depending on network connection. If we
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* are not mounting real device (NFS, CIFS), we rely on _netdev effect
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* on the mount unit itself. */
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_cleanup_free_ char *node = NULL, *unit = NULL;
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int r;
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if (!fstab_test_option(opts, "_netdev\0"))
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return 0;
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node = fstab_node_to_udev_node(what);
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if (!node)
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return log_oom();
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/* Nothing to apply dependencies to. */
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if (!is_device_path(node))
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return 0;
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r = unit_name_from_path(node, ".device", &unit);
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if (r < 0)
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return log_error_errno(r, "Failed to make unit name from path: %m");
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/* See mount_add_default_dependencies for explanation why we create such
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* dependencies. */
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return write_drop_in_format(dir, unit, 50, "netdev-dependencies",
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"# Automatically generated by %s\n\n"
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"[Unit]\n"
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"After=" SPECIAL_NETWORK_ONLINE_TARGET " " SPECIAL_NETWORK_TARGET "\n"
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"Wants=" SPECIAL_NETWORK_ONLINE_TARGET "\n",
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program_invocation_short_name);
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}
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int generator_write_initrd_root_device_deps(const char *dir, const char *what) {
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_cleanup_free_ char *unit = NULL;
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int r;
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r = unit_name_from_path(what, ".device", &unit);
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if (r < 0)
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return log_error_errno(r, "Failed to make unit name from path: %m");
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return write_drop_in_format(dir, SPECIAL_INITRD_ROOT_DEVICE_TARGET, 50, "root-device",
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"# Automatically generated by %s\n\n"
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"[Unit]\n"
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"Requires=%s\n"
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"After=%s",
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program_invocation_short_name,
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unit,
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unit);
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}
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