891 lines
27 KiB
C
891 lines
27 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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 <sys/stat.h>
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#include <stdio.h>
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#include <getopt.h>
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#include <errno.h>
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#include <unistd.h>
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#include "log.h"
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#include "path-lookup.h"
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#include "util.h"
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#include "macro.h"
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#include "strv.h"
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#include "conf-parser.h"
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#include "dbus-common.h"
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static bool arg_force = false;
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static enum {
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WHERE_SYSTEM,
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WHERE_SESSION,
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WHERE_GLOBAL,
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} arg_where = WHERE_SYSTEM;
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static enum {
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ACTION_INVALID,
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ACTION_ENABLE,
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ACTION_DISABLE,
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ACTION_TEST
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} arg_action = ACTION_INVALID;
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static enum {
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START_NO, /* Don't start/stop or anything */
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START_MINIMAL, /* Only shutdown/restart if running. */
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START_MAYBE, /* Start if WantedBy= suggests */
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START_YES /* Start unconditionally */
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} arg_start = START_NO;
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typedef struct {
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char *name;
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char *path;
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char **aliases;
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char **wanted_by;
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} InstallInfo;
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Hashmap *will_install = NULL, *have_installed = NULL;
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static int help(void) {
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printf("%s [OPTIONS...] {COMMAND} ...\n\n"
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"Install init system units.\n\n"
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" -h --help Show this help\n"
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" --force Override existing links\n"
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" --system Install into system\n"
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" --session Install into session\n"
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" --global Install into all sessions\n"
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" --start[=MODE] Start/stop/restart unit after installation\n"
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" Takes 'no', 'minimal', 'maybe' or 'yes'\n\n"
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"Commands:\n"
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" enable [NAME...] Enable one or more units\n"
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" disable [NAME...] Disable one or more units\n"
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" test [NAME...] Test whether any of the specified units are enabled\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_SESSION = 0x100,
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ARG_SYSTEM,
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ARG_GLOBAL,
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ARG_FORCE,
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ARG_START
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "session", no_argument, NULL, ARG_SESSION },
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{ "system", no_argument, NULL, ARG_SYSTEM },
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{ "global", no_argument, NULL, ARG_GLOBAL },
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{ "force", no_argument, NULL, ARG_FORCE },
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{ "start", optional_argument, NULL, ARG_START },
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{ NULL, 0, NULL, 0 }
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};
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int c;
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assert(argc >= 1);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_SESSION:
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arg_where = WHERE_SESSION;
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break;
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case ARG_SYSTEM:
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arg_where = WHERE_SYSTEM;
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break;
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case ARG_GLOBAL:
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arg_where = WHERE_GLOBAL;
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break;
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case ARG_FORCE:
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arg_force = true;
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break;
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case ARG_START:
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if (!optarg)
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arg_start = START_MAYBE;
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else if (streq(optarg, "no"))
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arg_start = START_NO;
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else if (streq(optarg, "minimal"))
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arg_start = START_MINIMAL;
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else if (streq(optarg, "maybe"))
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arg_start = START_MAYBE;
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else if (streq(optarg, "yes"))
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arg_start = START_YES;
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else {
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log_error("Invalid --start argument %s", optarg);
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return -EINVAL;
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}
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break;
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case '?':
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return -EINVAL;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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}
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if (optind >= argc) {
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help();
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return -EINVAL;
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}
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if (streq(argv[optind], "enable"))
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arg_action = ACTION_ENABLE;
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else if (streq(argv[optind], "disable"))
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arg_action = ACTION_DISABLE;
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else if (streq(argv[optind], "test"))
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arg_action = ACTION_TEST;
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else {
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log_error("Unknown verb %s.", argv[optind]);
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return -EINVAL;
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}
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optind++;
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if (optind >= argc) {
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log_error("Missing unit name.");
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return -EINVAL;
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}
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return 1;
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}
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static void install_info_free(InstallInfo *i) {
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assert(i);
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free(i->name);
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free(i->path);
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strv_free(i->aliases);
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strv_free(i->wanted_by);
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free(i);
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}
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static void install_info_hashmap_free(Hashmap *m) {
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InstallInfo *i;
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while ((i = hashmap_steal_first(m)))
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install_info_free(i);
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hashmap_free(m);
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}
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static bool unit_name_valid(const char *name) {
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/* This is a minimal version of unit_name_valid() from
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* unit-name.c */
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if (!*name)
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return false;
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if (ignore_file(name))
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return false;
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return true;
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}
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static int install_info_add(const char *name) {
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InstallInfo *i;
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int r;
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if (!unit_name_valid(name))
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return -EINVAL;
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if (hashmap_get(have_installed, name) ||
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hashmap_get(will_install, name))
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return 0;
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if (!(i = new0(InstallInfo, 1))) {
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r = -ENOMEM;
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goto fail;
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}
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if (!(i->name = strdup(name))) {
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r = -ENOMEM;
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goto fail;
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}
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if ((r = hashmap_put(will_install, i->name, i)) < 0)
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goto fail;
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return 0;
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fail:
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if (i)
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install_info_free(i);
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return r;
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}
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static int daemon_reload(DBusConnection *bus) {
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DBusMessage *m = NULL, *reply = NULL;
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DBusError error;
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int r;
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assert(bus);
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dbus_error_init(&error);
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"Reload"))) {
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log_error("Could not allocate message.");
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return -ENOMEM;
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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log_error("Failed to reload configuration: %s", error.message);
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r = -EIO;
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goto finish;
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}
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r = 0;
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return r;
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}
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static int install_info_run(DBusConnection *bus, InstallInfo *i) {
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DBusMessage *m = NULL, *reply = NULL;
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DBusError error;
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int r;
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const char *mode = "replace";
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assert(bus);
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assert(i);
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dbus_error_init(&error);
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if (arg_action == ACTION_ENABLE) {
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if (arg_start == START_MAYBE) {
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char **k;
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bool yes_please = false;
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STRV_FOREACH(k, i->wanted_by) {
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DBusMessageIter sub, iter;
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const char *path, *state;
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const char *interface = "org.freedesktop.systemd1.Unit";
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const char *property = "ActiveState";
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"GetUnit"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, k,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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/* Hmm, this unit doesn't exist, let's try the next one */
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dbus_message_unref(m);
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m = NULL;
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continue;
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}
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if (!dbus_message_get_args(reply, &error,
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DBUS_TYPE_OBJECT_PATH, &path,
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DBUS_TYPE_INVALID)) {
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log_error("Failed to parse reply: %s", error.message);
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r = -EIO;
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goto finish;
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}
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dbus_message_unref(m);
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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path,
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"org.freedesktop.DBus.Properties",
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"Get"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &interface,
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DBUS_TYPE_STRING, &property,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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dbus_message_unref(reply);
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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log_error("Failed to issue method call: %s", error.message);
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r = -EIO;
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goto finish;
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}
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if (!dbus_message_iter_init(reply, &iter) ||
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dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_recurse(&iter, &sub);
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if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) {
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log_error("Failed to parse reply.");
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r = -EIO;
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goto finish;
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}
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dbus_message_iter_get_basic(&sub, &state);
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dbus_message_unref(m);
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dbus_message_unref(reply);
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m = reply = NULL;
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if (streq(state, "active") ||
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startswith(state, "reloading") ||
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startswith(state, "activating")) {
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yes_please = true;
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break;
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}
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}
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if (!yes_please) {
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r = 0;
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goto finish;
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}
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}
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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arg_start == START_MINIMAL ? "TryRestartUnit" : "RestartUnit"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &i->name,
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DBUS_TYPE_STRING, &mode,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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} else if (arg_action == ACTION_DISABLE) {
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if (!(m = dbus_message_new_method_call(
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"StopUnit"))) {
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log_error("Could not allocate message.");
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r = -ENOMEM;
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goto finish;
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}
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if (!dbus_message_append_args(m,
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DBUS_TYPE_STRING, &i->name,
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DBUS_TYPE_STRING, &mode,
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DBUS_TYPE_INVALID)) {
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log_error("Could not append arguments to message.");
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r = -ENOMEM;
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goto finish;
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}
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}
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if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
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log_error("Failed to reload configuration: %s", error.message);
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r = -EIO;
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goto finish;
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}
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r = 0;
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finish:
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if (m)
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dbus_message_unref(m);
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if (reply)
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dbus_message_unref(reply);
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dbus_error_free(&error);
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return r;
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}
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static int config_parse_also(
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const char *filename,
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unsigned line,
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const char *section,
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const char *lvalue,
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const char *rvalue,
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void *data,
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void *userdata) {
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char *w;
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size_t l;
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char *state;
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assert(filename);
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assert(lvalue);
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assert(rvalue);
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FOREACH_WORD_QUOTED(w, l, rvalue, state) {
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char *n;
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int r;
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if (!(n = strndup(w, l)))
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return -ENOMEM;
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r = install_info_add(n);
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free(n);
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if (r < 0)
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return r;
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}
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return 0;
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}
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static int create_symlink(const char *old_path, const char *new_path) {
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int r;
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assert(old_path);
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assert(new_path);
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if (arg_action == ACTION_ENABLE) {
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char *dest;
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mkdir_parents(new_path, 0755);
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if (symlink(old_path, new_path) >= 0)
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return 0;
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if (errno != EEXIST) {
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log_error("Cannot link %s to %s: %m", old_path, new_path);
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return -errno;
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}
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if ((r = readlink_and_make_absolute(new_path, &dest)) < 0) {
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if (errno == EINVAL) {
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log_error("Cannot link %s to %s, file exists already and is not a symlink.", old_path, new_path);
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return -EEXIST;
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}
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log_error("readlink() failed: %s", strerror(-r));
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return r;
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}
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if (streq(dest, old_path)) {
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free(dest);
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return 0;
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}
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if (!arg_force) {
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log_error("Cannot link %s to %s, symlink exists already and points to %s.", old_path, new_path, dest);
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free(dest);
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return -EEXIST;
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}
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free(dest);
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unlink(new_path);
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if (symlink(old_path, new_path) >= 0)
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return 0;
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log_error("Cannot link %s to %s: %m", old_path, new_path);
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return -errno;
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} else if (arg_action == ACTION_DISABLE) {
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char *dest;
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if ((r = readlink_and_make_absolute(new_path, &dest)) < 0) {
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if (errno == ENOENT)
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return 0;
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if (errno == EINVAL) {
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log_warning("File %s not a symlink, ignoring.", old_path);
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return 0;
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}
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log_error("readlink() failed: %s", strerror(-r));
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return r;
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}
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if (!streq(dest, old_path)) {
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log_warning("File %s not a symlink to %s but points to %s, ignoring.", new_path, old_path, dest);
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free(dest);
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return 0;
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}
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free(dest);
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if (unlink(new_path) >= 0)
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return 0;
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log_error("Cannot unlink %s: %m", new_path);
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return -errno;
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} else if (arg_action == ACTION_TEST) {
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char *dest;
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if ((r = readlink_and_make_absolute(new_path, &dest)) < 0) {
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|
|
if (errno == ENOENT || errno == EINVAL)
|
|
return 0;
|
|
|
|
log_error("readlink() failed: %s", strerror(-r));
|
|
return r;
|
|
}
|
|
|
|
if (streq(dest, old_path)) {
|
|
free(dest);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
assert_not_reached("Unknown action.");
|
|
}
|
|
|
|
static int install_info_symlink_alias(InstallInfo *i, const char *config_path) {
|
|
char **s;
|
|
char *alias_path = NULL;
|
|
int r;
|
|
|
|
assert(i);
|
|
|
|
STRV_FOREACH(s, i->aliases) {
|
|
|
|
if (!unit_name_valid(*s)) {
|
|
log_error("Invalid name %s.", *s);
|
|
r = -EINVAL;
|
|
goto finish;
|
|
}
|
|
|
|
free(alias_path);
|
|
if (!(alias_path = path_make_absolute(*s, config_path))) {
|
|
log_error("Out of memory");
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
if ((r = create_symlink(i->path, alias_path)) != 0)
|
|
goto finish;
|
|
|
|
if (arg_action == ACTION_DISABLE)
|
|
rmdir_parents(alias_path, config_path);
|
|
}
|
|
|
|
r = 0;
|
|
|
|
finish:
|
|
free(alias_path);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int install_info_symlink_wants(InstallInfo *i, const char *config_path) {
|
|
char **s;
|
|
char *alias_path = NULL;
|
|
int r;
|
|
|
|
assert(i);
|
|
|
|
STRV_FOREACH(s, i->wanted_by) {
|
|
if (!unit_name_valid(*s)) {
|
|
log_error("Invalid name %s.", *s);
|
|
r = -EINVAL;
|
|
goto finish;
|
|
}
|
|
|
|
free(alias_path);
|
|
alias_path = NULL;
|
|
|
|
if (asprintf(&alias_path, "%s/%s.wants/%s", config_path, *s, i->name) < 0) {
|
|
log_error("Out of memory");
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
if ((r = create_symlink(i->path, alias_path)) != 0)
|
|
goto finish;
|
|
|
|
if (arg_action == ACTION_DISABLE)
|
|
rmdir_parents(alias_path, config_path);
|
|
}
|
|
|
|
r = 0;
|
|
|
|
finish:
|
|
free(alias_path);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int install_info_apply(LookupPaths *paths, InstallInfo *i, const char *config_path) {
|
|
|
|
const ConfigItem items[] = {
|
|
{ "Alias", config_parse_strv, &i->aliases, "Install" },
|
|
{ "WantedBy", config_parse_strv, &i->wanted_by, "Install" },
|
|
{ "Also", config_parse_also, NULL, "Install" },
|
|
|
|
{ NULL, NULL, NULL, NULL }
|
|
};
|
|
|
|
char **p;
|
|
char *filename = NULL;
|
|
FILE *f = NULL;
|
|
int r;
|
|
|
|
assert(paths);
|
|
assert(i);
|
|
|
|
STRV_FOREACH(p, paths->unit_path) {
|
|
|
|
if (!(filename = path_make_absolute(i->name, *p))) {
|
|
log_error("Out of memory");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if ((f = fopen(filename, "re")))
|
|
break;
|
|
|
|
free(filename);
|
|
filename = NULL;
|
|
|
|
if (errno != ENOENT) {
|
|
log_error("Failed to open %s: %m", filename);
|
|
return -errno;
|
|
}
|
|
}
|
|
|
|
if (!f) {
|
|
log_error("Couldn't find %s.", i->name);
|
|
return -ENOENT;
|
|
}
|
|
|
|
i->path = filename;
|
|
|
|
if ((r = config_parse(filename, f, NULL, items, true, i)) < 0) {
|
|
fclose(f);
|
|
return r;
|
|
}
|
|
|
|
fclose(f);
|
|
|
|
if ((r = install_info_symlink_alias(i, config_path)) != 0)
|
|
return r;
|
|
|
|
if ((r = install_info_symlink_wants(i, config_path)) != 0)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char *get_config_path(void) {
|
|
|
|
switch (arg_where) {
|
|
|
|
case WHERE_SYSTEM:
|
|
return strdup(SYSTEM_CONFIG_UNIT_PATH);
|
|
|
|
case WHERE_GLOBAL:
|
|
return strdup(SESSION_CONFIG_UNIT_PATH);
|
|
|
|
case WHERE_SESSION: {
|
|
char *p;
|
|
|
|
if (session_config_home(&p) < 0)
|
|
return NULL;
|
|
|
|
return p;
|
|
}
|
|
|
|
default:
|
|
assert_not_reached("Unknown config path.");
|
|
}
|
|
}
|
|
|
|
static int do_run(void) {
|
|
DBusConnection *bus = NULL;
|
|
DBusError error;
|
|
int r, q;
|
|
Iterator i;
|
|
InstallInfo *j;
|
|
|
|
dbus_error_init(&error);
|
|
|
|
if (arg_start == START_NO)
|
|
return 0;
|
|
|
|
if (arg_where == WHERE_GLOBAL) {
|
|
log_warning("Warning: --start has no effect with --global.");
|
|
return 0;
|
|
}
|
|
|
|
if (arg_action != ACTION_ENABLE && arg_action != ACTION_DISABLE) {
|
|
log_warning("Warning: --start has no effect with test.");
|
|
return 0;
|
|
}
|
|
|
|
if ((r = bus_connect(arg_where == WHERE_SESSION ? DBUS_BUS_SESSION : DBUS_BUS_SYSTEM, &bus, NULL, &error)) < 0) {
|
|
log_error("Failed to get D-Bus connection: %s", error.message);
|
|
goto finish;
|
|
}
|
|
|
|
r = 0;
|
|
|
|
if (arg_action == ACTION_ENABLE)
|
|
if ((r = daemon_reload(bus)) < 0)
|
|
goto finish;
|
|
|
|
HASHMAP_FOREACH(j, have_installed, i)
|
|
if ((q = install_info_run(bus, j)) < 0)
|
|
r = q;
|
|
|
|
if (arg_action == ACTION_DISABLE)
|
|
if ((q = daemon_reload(bus)) < 0)
|
|
r = q;
|
|
|
|
finish:
|
|
if (bus)
|
|
dbus_connection_unref(bus);
|
|
|
|
dbus_error_free(&error);
|
|
|
|
dbus_shutdown();
|
|
return r;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
int r, retval = 1, j;
|
|
LookupPaths paths;
|
|
InstallInfo *i;
|
|
char *config_path = NULL;
|
|
|
|
zero(paths);
|
|
|
|
log_parse_environment();
|
|
|
|
if ((r = parse_argv(argc, argv)) < 0)
|
|
goto finish;
|
|
else if (r == 0) {
|
|
retval = 0;
|
|
goto finish;
|
|
}
|
|
|
|
if ((r = lookup_paths_init(&paths, arg_where == WHERE_SYSTEM ? MANAGER_SYSTEM : MANAGER_SESSION)) < 0) {
|
|
log_error("Failed to determine lookup paths: %s", strerror(-r));
|
|
goto finish;
|
|
}
|
|
|
|
if (!(config_path = get_config_path())) {
|
|
log_error("Failed to determine config path");
|
|
goto finish;
|
|
}
|
|
|
|
will_install = hashmap_new(string_hash_func, string_compare_func);
|
|
have_installed = hashmap_new(string_hash_func, string_compare_func);
|
|
|
|
if (!will_install || !have_installed) {
|
|
log_error("Failed to allocate unit sets.");
|
|
goto finish;
|
|
}
|
|
|
|
for (j = optind; j < argc; j++)
|
|
if ((r = install_info_add(argv[j])) < 0)
|
|
goto finish;
|
|
|
|
while ((i = hashmap_first(will_install))) {
|
|
assert_se(hashmap_move_one(have_installed, will_install, i->name) == 0);
|
|
|
|
if ((r = install_info_apply(&paths, i, config_path)) != 0) {
|
|
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
/* In test mode and found something */
|
|
retval = 0;
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
if (do_run() < 0)
|
|
goto finish;
|
|
|
|
retval = arg_action == ACTION_TEST ? 1 : 0;
|
|
|
|
finish:
|
|
install_info_hashmap_free(will_install);
|
|
install_info_hashmap_free(have_installed);
|
|
|
|
lookup_paths_free(&paths);
|
|
|
|
free(config_path);
|
|
|
|
return retval;
|
|
}
|