mirror of
https://git.notmuchmail.org/git/notmuch
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d399b6b909
Add mechanism for running user defined hooks. Hooks are executables or symlinks to executables stored under the new notmuch hooks directory, <database-path>/.notmuch/hooks. No hooks are introduced here, but adding support for a hook is now a simple matter of calling the new notmuch_run_hook() function at an appropriate location with the hook name. Signed-off-by: Jani Nikula <jani@nikula.org>
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* notmuch - Not much of an email program, (just index and search)
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*
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* This file is part of notmuch.
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*
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* Copyright © 2011 Jani Nikula
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see http://www.gnu.org/licenses/ .
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*
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* Author: Jani Nikula <jani@nikula.org>
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*/
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#include "notmuch-client.h"
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#include <sys/wait.h>
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int
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notmuch_run_hook (const char *db_path, const char *hook)
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{
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char *hook_path;
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int status = 0;
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pid_t pid;
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hook_path = talloc_asprintf (NULL, "%s/%s/%s/%s", db_path, ".notmuch",
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"hooks", hook);
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if (hook_path == NULL) {
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fprintf (stderr, "Out of memory\n");
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return 1;
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}
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/* Check access before fork() for speed and simplicity of error handling. */
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if (access (hook_path, X_OK) == -1) {
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/* Ignore ENOENT. It's okay not to have a hook, hook dir, or even
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* notmuch dir. Dangling symbolic links also result in ENOENT, but
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* we'll ignore that too for simplicity. */
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if (errno != ENOENT) {
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fprintf (stderr, "Error: %s hook access failed: %s\n", hook,
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strerror (errno));
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status = 1;
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}
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goto DONE;
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}
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pid = fork();
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if (pid == -1) {
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fprintf (stderr, "Error: %s hook fork failed: %s\n", hook,
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strerror (errno));
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status = 1;
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goto DONE;
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} else if (pid == 0) {
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execl (hook_path, hook_path, NULL);
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/* Same as above for ENOENT, but unlikely now. Indicate all other errors
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* to parent through non-zero exit status. */
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if (errno != ENOENT) {
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fprintf (stderr, "Error: %s hook execution failed: %s\n", hook,
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strerror (errno));
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status = 1;
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}
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exit (status);
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}
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if (waitpid (pid, &status, 0) == -1) {
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fprintf (stderr, "Error: %s hook wait failed: %s\n", hook,
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strerror (errno));
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status = 1;
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goto DONE;
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}
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if (!WIFEXITED (status) || WEXITSTATUS (status)) {
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if (WIFEXITED (status)) {
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fprintf (stderr, "Error: %s hook failed with status %d\n",
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hook, WEXITSTATUS (status));
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} else if (WIFSIGNALED (status)) {
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fprintf (stderr, "Error: %s hook terminated with signal %d\n",
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hook, WTERMSIG (status));
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}
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status = 1;
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}
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DONE:
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talloc_free (hook_path);
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return status;
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}
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