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 negate
) {
33 c
= new0(Condition
, 1);
38 if (!(c
->parameter
= strdup(parameter
))) {
46 void condition_free(Condition
*c
) {
53 void condition_free_list(Condition
*first
) {
56 LIST_FOREACH_SAFE(conditions
, c
, n
, first
)
60 static bool test_kernel_command_line(const char *parameter
) {
61 char *line
, *w
, *state
, *word
= NULL
;
67 if ((r
= read_one_line_file("/proc/cmdline", &line
)) < 0) {
68 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r
));
72 equal
= !!strchr(parameter
, '=');
73 pl
= strlen(parameter
);
75 FOREACH_WORD_QUOTED(w
, l
, line
, state
) {
78 if (!(word
= strndup(w
, l
)))
82 if (streq(word
, parameter
)) {
87 if (startswith(word
, parameter
) && (word
[pl
] == '=' || word
[pl
] == 0)) {
101 bool condition_test(Condition
*c
) {
106 case CONDITION_PATH_EXISTS
:
107 return (access(c
->parameter
, F_OK
) >= 0) == !c
->negate
;
109 case CONDITION_DIRECTORY_NOT_EMPTY
: {
112 k
= dir_is_empty(c
->parameter
);
113 return !(k
== -ENOENT
|| k
> 0) == !c
->negate
;
116 case CONDITION_KERNEL_COMMAND_LINE
:
117 return !!test_kernel_command_line(c
->parameter
) == !c
->negate
;
123 assert_not_reached("Invalid condition type.");
127 bool condition_test_list(Condition
*first
) {
130 /* If the condition list is empty, then it is true */
134 /* Otherwise, if any of the conditions apply we return true */
135 LIST_FOREACH(conditions
, c
, first
)
136 if (condition_test(c
))
142 void condition_dump(Condition
*c
, FILE *f
, const char *prefix
) {
152 condition_type_to_string(c
->type
),
153 c
->negate
? "!" : "",
157 void condition_dump_list(Condition
*first
, FILE *f
, const char *prefix
) {
160 LIST_FOREACH(conditions
, c
, first
)
161 condition_dump(c
, f
, prefix
);
164 static const char* const condition_type_table
[_CONDITION_TYPE_MAX
] = {
165 [CONDITION_KERNEL_COMMAND_LINE
] = "ConditionKernelCommandLine",
166 [CONDITION_PATH_EXISTS
] = "ConditionPathExists",
167 [CONDITION_NULL
] = "ConditionNull"
170 DEFINE_STRING_TABLE_LOOKUP(condition_type
, ConditionType
);