1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
28 #include "condition.h"
30 Condition* condition_new(ConditionType type, const char *parameter, bool trigger, bool negate) {
33 if (!(c = new0(Condition, 1)))
41 if (!(c->parameter = strdup(parameter))) {
49 void condition_free(Condition *c) {
56 void condition_free_list(Condition *first) {
59 LIST_FOREACH_SAFE(conditions, c, n, first)
63 static bool test_kernel_command_line(const char *parameter) {
64 char *line, *w, *state, *word = NULL;
72 if (detect_virtualization(NULL) > 0)
75 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
76 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
80 equal = !!strchr(parameter, '=');
81 pl = strlen(parameter);
83 FOREACH_WORD_QUOTED(w, l, line, state) {
86 if (!(word = strndup(w, l)))
90 if (streq(word, parameter)) {
95 if (startswith(word, parameter) && (word[pl] == '=' || word[pl] == 0)) {
109 static bool test_virtualization(const char *parameter) {
115 if ((r = detect_virtualization(&id)) < 0) {
116 log_warning("Failed to detect virtualization, ignoring: %s", strerror(-r));
120 b = parse_boolean(parameter);
125 if (r == 0 && b == 0)
128 return streq(parameter, id);
131 bool condition_test(Condition *c) {
136 case CONDITION_PATH_EXISTS:
137 return (access(c->parameter, F_OK) >= 0) == !c->negate;
139 case CONDITION_PATH_IS_DIRECTORY: {
142 if (lstat(c->parameter, &st) < 0)
144 return S_ISDIR(st.st_mode) == !c->negate;
147 case CONDITION_DIRECTORY_NOT_EMPTY: {
150 k = dir_is_empty(c->parameter);
151 return !(k == -ENOENT || k > 0) == !c->negate;
154 case CONDITION_KERNEL_COMMAND_LINE:
155 return test_kernel_command_line(c->parameter) == !c->negate;
157 case CONDITION_VIRTUALIZATION:
158 return test_virtualization(c->parameter) == !c->negate;
164 assert_not_reached("Invalid condition type.");
168 bool condition_test_list(Condition *first) {
172 /* If the condition list is empty, then it is true */
176 /* Otherwise, if all of the non-trigger conditions apply and
177 * if any of the trigger conditions apply (unless there are
178 * none) we return true */
179 LIST_FOREACH(conditions, c, first) {
182 b = condition_test(c);
184 if (!c->trigger && !b)
187 if (c->trigger && triggered <= 0)
191 return triggered != 0;
194 void condition_dump(Condition *c, FILE *f, const char *prefix) {
204 condition_type_to_string(c->type),
205 c->trigger ? "|" : "",
206 c->negate ? "!" : "",
210 void condition_dump_list(Condition *first, FILE *f, const char *prefix) {
213 LIST_FOREACH(conditions, c, first)
214 condition_dump(c, f, prefix);
217 static const char* const condition_type_table[_CONDITION_TYPE_MAX] = {
218 [CONDITION_KERNEL_COMMAND_LINE] = "ConditionKernelCommandLine",
219 [CONDITION_PATH_EXISTS] = "ConditionPathExists",
220 [CONDITION_NULL] = "ConditionNull"
223 DEFINE_STRING_TABLE_LOOKUP(condition_type, ConditionType);