594 lines
16 KiB
C
594 lines
16 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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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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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]\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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"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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};
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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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{ 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 '?':
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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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log_error("Missing verb.");
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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 (strchr(name, '/'))
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return false;
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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 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)
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return 0;
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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 1;
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}
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return 0;
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}
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assert_not_reached("Unknown action.");
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}
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static int install_info_symlink_alias(InstallInfo *i, const char *config_path) {
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char **s;
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char *alias_path = NULL;
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int r;
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assert(i);
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STRV_FOREACH(s, i->aliases) {
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if (!unit_name_valid(*s)) {
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log_error("Invalid name %s.", *s);
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r = -EINVAL;
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goto finish;
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}
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free(alias_path);
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if (!(alias_path = path_make_absolute(*s, config_path))) {
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log_error("Out of memory");
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r = -ENOMEM;
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goto finish;
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}
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if ((r = create_symlink(i->path, alias_path)) != 0)
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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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free(alias_path);
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return r;
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}
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static int install_info_symlink_wants(InstallInfo *i, const char *config_path) {
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char **s;
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char *alias_path = NULL;
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int r;
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assert(i);
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STRV_FOREACH(s, i->wanted_by) {
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if (!unit_name_valid(*s)) {
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log_error("Invalid name %s.", *s);
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r = -EINVAL;
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goto finish;
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}
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free(alias_path);
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alias_path = NULL;
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if (asprintf(&alias_path, "%s/%s.wants/%s", config_path, *s, i->name) < 0) {
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log_error("Out of memory");
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r = -ENOMEM;
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goto finish;
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}
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if ((r = create_symlink(i->path, alias_path)) != 0)
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goto finish;
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if (arg_action == ACTION_DISABLE) {
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char *t;
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/* Try to remove .wants dir if we don't need it anymore */
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if (asprintf(&t, "%s/%s.wants", config_path, *s) >= 0) {
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rmdir(t);
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free(t);
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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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free(alias_path);
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return r;
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}
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static int install_info_apply(LookupPaths *paths, InstallInfo *i, const char *config_path) {
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const ConfigItem items[] = {
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{ "Alias", config_parse_strv, &i->aliases, "Install" },
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{ "WantedBy", config_parse_strv, &i->wanted_by, "Install" },
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{ "Also", config_parse_also, NULL, "Install" },
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{ NULL, NULL, NULL, NULL }
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};
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char **p;
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char *filename = NULL;
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FILE *f = NULL;
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int r;
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assert(paths);
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assert(i);
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STRV_FOREACH(p, paths->unit_path) {
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if (!(filename = path_make_absolute(i->name, *p))) {
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log_error("Out of memory");
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return -ENOMEM;
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}
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if ((f = fopen(filename, "re")))
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break;
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free(filename);
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filename = NULL;
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if (errno != ENOENT) {
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log_error("Failed to open %s: %m", filename);
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return -errno;
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}
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}
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if (!f) {
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log_error("Couldn't find %s.", i->name);
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return -ENOENT;
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}
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i->path = filename;
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if ((r = config_parse(filename, f, NULL, items, true, i)) < 0) {
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fclose(f);
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return r;
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}
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fclose(f);
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if ((r = install_info_symlink_alias(i, config_path)) != 0)
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return r;
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if ((r = install_info_symlink_wants(i, config_path)) != 0)
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return r;
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return 0;
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}
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static char *get_config_path(void) {
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switch (arg_where) {
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case WHERE_SYSTEM:
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return strdup(SYSTEM_CONFIG_UNIT_PATH);
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case WHERE_GLOBAL:
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return strdup(SESSION_CONFIG_UNIT_PATH);
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case WHERE_SESSION: {
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char *p;
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if (session_config_home(&p) < 0)
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return NULL;
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return p;
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}
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default:
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assert_not_reached("Unknown config path.");
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}
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}
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int main(int argc, char *argv[]) {
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int r, retval = 1, j;
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LookupPaths paths;
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InstallInfo *i;
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char *config_path = NULL;
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zero(paths);
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log_set_target(LOG_TARGET_CONSOLE);
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log_set_max_level(LOG_INFO);
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log_parse_environment();
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if ((r = parse_argv(argc, argv)) < 0)
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goto finish;
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else if (r == 0) {
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retval = 0;
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goto finish;
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}
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if ((r = lookup_paths_init(&paths, arg_where == WHERE_SYSTEM ? MANAGER_INIT : MANAGER_SESSION)) < 0) {
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log_error("Failed to determine lookup paths: %s", strerror(-r));
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goto finish;
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}
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if (!(config_path = get_config_path())) {
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log_error("Failed to determine config path");
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goto finish;
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}
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will_install = hashmap_new(string_hash_func, string_compare_func);
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have_installed = hashmap_new(string_hash_func, string_compare_func);
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if (!will_install || !have_installed) {
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log_error("Failed to allocate unit sets.");
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goto finish;
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}
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for (j = optind; j < argc; j++)
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if ((r = install_info_add(argv[j])) < 0)
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goto finish;
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while ((i = hashmap_first(will_install))) {
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assert_se(hashmap_move_one(have_installed, will_install, i->name) == 0);
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if ((r = install_info_apply(&paths, i, config_path)) != 0) {
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if (r < 0)
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goto finish;
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/* In test mode and found something */
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retval = 0;
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goto finish;
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}
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}
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retval = arg_action == ACTION_TEST ? 1 : 0;
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finish:
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install_info_hashmap_free(will_install);
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install_info_hashmap_free(have_installed);
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lookup_paths_free(&paths);
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free(config_path);
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return retval;
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}
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