diff options
author | Jani Nikula <jani@nikula.org> | 2011-12-09 00:48:29 +0200 |
---|---|---|
committer | David Bremner <bremner@debian.org> | 2011-12-11 13:57:31 -0400 |
commit | d399b6b909fe6e2c6073464006061382c8bb31d5 (patch) | |
tree | 3cfadc14d05d5ef57e3c32d3568c4b0eaf91a433 /hooks.c | |
parent | ae13d612c14f654d4bc12c93481227e4d24fda82 (diff) |
cli: introduce the concept of user defined hooks
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>
Diffstat (limited to 'hooks.c')
-rw-r--r-- | hooks.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/hooks.c b/hooks.c new file mode 100644 index 00000000..44ee4198 --- /dev/null +++ b/hooks.c @@ -0,0 +1,93 @@ +/* notmuch - Not much of an email program, (just index and search) + * + * This file is part of notmuch. + * + * Copyright © 2011 Jani Nikula + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see http://www.gnu.org/licenses/ . + * + * Author: Jani Nikula <jani@nikula.org> + */ + +#include "notmuch-client.h" +#include <sys/wait.h> + +int +notmuch_run_hook (const char *db_path, const char *hook) +{ + char *hook_path; + int status = 0; + pid_t pid; + + hook_path = talloc_asprintf (NULL, "%s/%s/%s/%s", db_path, ".notmuch", + "hooks", hook); + if (hook_path == NULL) { + fprintf (stderr, "Out of memory\n"); + return 1; + } + + /* Check access before fork() for speed and simplicity of error handling. */ + if (access (hook_path, X_OK) == -1) { + /* Ignore ENOENT. It's okay not to have a hook, hook dir, or even + * notmuch dir. Dangling symbolic links also result in ENOENT, but + * we'll ignore that too for simplicity. */ + if (errno != ENOENT) { + fprintf (stderr, "Error: %s hook access failed: %s\n", hook, + strerror (errno)); + status = 1; + } + goto DONE; + } + + pid = fork(); + if (pid == -1) { + fprintf (stderr, "Error: %s hook fork failed: %s\n", hook, + strerror (errno)); + status = 1; + goto DONE; + } else if (pid == 0) { + execl (hook_path, hook_path, NULL); + /* Same as above for ENOENT, but unlikely now. Indicate all other errors + * to parent through non-zero exit status. */ + if (errno != ENOENT) { + fprintf (stderr, "Error: %s hook execution failed: %s\n", hook, + strerror (errno)); + status = 1; + } + exit (status); + } + + if (waitpid (pid, &status, 0) == -1) { + fprintf (stderr, "Error: %s hook wait failed: %s\n", hook, + strerror (errno)); + status = 1; + goto DONE; + } + + if (!WIFEXITED (status) || WEXITSTATUS (status)) { + if (WIFEXITED (status)) { + fprintf (stderr, "Error: %s hook failed with status %d\n", + hook, WEXITSTATUS (status)); + } else if (WIFSIGNALED (status)) { + fprintf (stderr, "Error: %s hook terminated with signal %d\n", + hook, WTERMSIG (status)); + } + status = 1; + } + + DONE: + talloc_free (hook_path); + + return status; +} |