2 #include "run-command.h"
5 static inline void close_pair(int fd[2])
11 static inline void dup_devnull(int to)
13 int fd = open("/dev/null", O_RDWR);
18 int start_command(struct child_process *cmd)
20 int need_in, need_out, need_err;
21 int fdin[2], fdout[2], fderr[2];
24 * In case of errors we must keep the promise to close FDs
25 * that have been passed in via ->in and ->out.
28 need_in = !cmd->no_stdin && cmd->in < 0;
33 return -ERR_RUN_COMMAND_PIPE;
38 need_out = !cmd->no_stdout
39 && !cmd->stdout_to_stderr
42 if (pipe(fdout) < 0) {
47 return -ERR_RUN_COMMAND_PIPE;
52 need_err = !cmd->no_stderr && cmd->err < 0;
54 if (pipe(fderr) < 0) {
63 return -ERR_RUN_COMMAND_PIPE;
68 trace_argv_printf(cmd->argv, "trace: run_command:");
93 else if (cmd->stdout_to_stderr)
98 } else if (cmd->out > 1) {
103 if (cmd->dir && chdir(cmd->dir))
104 die("exec %s: cd to %s failed (%s)", cmd->argv[0],
105 cmd->dir, strerror(errno));
107 for (; *cmd->env; cmd->env++) {
108 if (strchr(*cmd->env, '='))
109 putenv((char *)*cmd->env);
117 execv_git_cmd(cmd->argv);
119 execvp(cmd->argv[0], (char *const*) cmd->argv);
121 trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
126 int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
127 const char **sargv = cmd->argv;
128 char **env = environ;
133 } else if (need_in) {
136 } else if (cmd->in) {
141 if (cmd->no_stderr) {
144 } else if (need_err) {
149 if (cmd->no_stdout) {
152 } else if (cmd->stdout_to_stderr) {
155 } else if (need_out) {
158 } else if (cmd->out > 1) {
164 die("chdir in start_command() not implemented");
166 env = copy_environ();
167 for (; *cmd->env; cmd->env++)
168 env = env_setenv(env, *cmd->env);
172 cmd->argv = prepare_git_cmd(cmd->argv);
175 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
184 dup2(s0, 0), close(s0);
186 dup2(s1, 1), close(s1);
188 dup2(s2, 2), close(s2);
203 return err == ENOENT ?
204 -ERR_RUN_COMMAND_EXEC :
205 -ERR_RUN_COMMAND_FORK;
224 static int wait_or_whine(pid_t pid)
228 pid_t waiting = waitpid(pid, &status, 0);
233 error("waitpid failed (%s)", strerror(errno));
234 return -ERR_RUN_COMMAND_WAITPID;
237 return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
238 if (WIFSIGNALED(status))
239 return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
241 if (!WIFEXITED(status))
242 return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
243 code = WEXITSTATUS(status);
246 return -ERR_RUN_COMMAND_EXEC;
255 int finish_command(struct child_process *cmd)
257 return wait_or_whine(cmd->pid);
260 int run_command(struct child_process *cmd)
262 int code = start_command(cmd);
265 return finish_command(cmd);
268 static void prepare_run_command_v_opt(struct child_process *cmd,
272 memset(cmd, 0, sizeof(*cmd));
274 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
275 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
276 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
279 int run_command_v_opt(const char **argv, int opt)
281 struct child_process cmd;
282 prepare_run_command_v_opt(&cmd, argv, opt);
283 return run_command(&cmd);
286 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
288 struct child_process cmd;
289 prepare_run_command_v_opt(&cmd, argv, opt);
292 return run_command(&cmd);
296 static __stdcall unsigned run_thread(void *data)
298 struct async *async = data;
299 return async->proc(async->fd_for_proc, async->data);
303 int start_async(struct async *async)
307 if (pipe(pipe_out) < 0)
308 return error("cannot create pipe: %s", strerror(errno));
309 async->out = pipe_out[0];
312 /* Flush stdio before fork() to avoid cloning buffers */
316 if (async->pid < 0) {
317 error("fork (async) failed: %s", strerror(errno));
318 close_pair(pipe_out);
323 exit(!!async->proc(pipe_out[1], async->data));
327 async->fd_for_proc = pipe_out[1];
328 async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
330 error("cannot create thread: %s", strerror(errno));
331 close_pair(pipe_out);
338 int finish_async(struct async *async)
343 if (wait_or_whine(async->pid))
344 ret = error("waitpid (async) failed");
347 if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
348 ret = error("waiting for thread failed: %lu", GetLastError());
349 else if (!GetExitCodeThread(async->tid, &ret))
350 ret = error("cannot get thread exit code: %lu", GetLastError());
351 CloseHandle(async->tid);
356 int run_hook(const char *index_file, const char *name, ...)
358 struct child_process hook;
359 const char **argv = NULL, *env[2];
360 char index[PATH_MAX];
363 size_t i = 0, alloc = 0;
365 if (access(git_path("hooks/%s", name), X_OK) < 0)
368 va_start(args, name);
369 ALLOC_GROW(argv, i + 1, alloc);
370 argv[i++] = git_path("hooks/%s", name);
372 ALLOC_GROW(argv, i + 1, alloc);
373 argv[i++] = va_arg(args, const char *);
377 memset(&hook, 0, sizeof(hook));
380 hook.stdout_to_stderr = 1;
382 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
388 ret = start_command(&hook);
391 warning("Could not spawn %s", argv[0]);
394 ret = finish_command(&hook);
395 if (ret == -ERR_RUN_COMMAND_WAITPID_SIGNAL)
396 warning("%s exited due to uncaught signal", argv[0]);