1 /* notmuch - Not much of an email program, (just index and search)
2 *
3 * This file is part of notmuch.
4 *
5 * Copyright © 2011 Jani Nikula
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see https://www.gnu.org/licenses/ .
19 *
20 * Author: Jani Nikula <jani@nikula.org>
21 */
22
23 #include "notmuch-client.h"
24 #include <sys/wait.h>
25
26 int
notmuch_run_hook(notmuch_database_t * notmuch,const char * hook)27 notmuch_run_hook (notmuch_database_t *notmuch, const char *hook)
28 {
29 char *hook_path;
30 int status = 0;
31 pid_t pid;
32
33 hook_path = talloc_asprintf (notmuch, "%s/%s",
34 notmuch_config_get (notmuch, NOTMUCH_CONFIG_HOOK_DIR),
35 hook);
36 if (hook_path == NULL) {
37 fprintf (stderr, "Out of memory\n");
38 return 1;
39 }
40
41 /* Check access before fork() for speed and simplicity of error handling. */
42 if (access (hook_path, X_OK) == -1) {
43 /* Ignore ENOENT. It's okay not to have a hook, hook dir, or even
44 * notmuch dir. Dangling symbolic links also result in ENOENT, but
45 * we'll ignore that too for simplicity. */
46 if (errno != ENOENT) {
47 fprintf (stderr, "Error: %s hook access failed: %s\n", hook,
48 strerror (errno));
49 status = 1;
50 }
51 goto DONE;
52 }
53
54 /* Flush any buffered output before forking. */
55 fflush (stdout);
56
57 pid = fork ();
58 if (pid == -1) {
59 fprintf (stderr, "Error: %s hook fork failed: %s\n", hook,
60 strerror (errno));
61 status = 1;
62 goto DONE;
63 } else if (pid == 0) {
64 execl (hook_path, hook_path, NULL);
65 /* Same as above for ENOENT, but unlikely now. Indicate all other errors
66 * to parent through non-zero exit status. */
67 if (errno != ENOENT) {
68 fprintf (stderr, "Error: %s hook execution failed: %s\n", hook,
69 strerror (errno));
70 status = 1;
71 }
72 exit (status);
73 }
74
75 if (waitpid (pid, &status, 0) == -1) {
76 fprintf (stderr, "Error: %s hook wait failed: %s\n", hook,
77 strerror (errno));
78 status = 1;
79 goto DONE;
80 }
81
82 if (! WIFEXITED (status) || WEXITSTATUS (status)) {
83 if (WIFEXITED (status)) {
84 fprintf (stderr, "Error: %s hook failed with status %d\n",
85 hook, WEXITSTATUS (status));
86 } else if (WIFSIGNALED (status)) {
87 fprintf (stderr, "Error: %s hook terminated with signal %d\n",
88 hook, WTERMSIG (status));
89 }
90 status = 1;
91 }
92
93 DONE:
94 talloc_free (hook_path);
95
96 return status;
97 }
98