2 #include "run-command.h"
5 static inline void close_pair(int fd[2])
12 static inline void dup_devnull(int to)
14 int fd = open("/dev/null", O_RDWR);
20 int start_command(struct child_process *cmd)
22 int need_in, need_out, need_err;
23 int fdin[2], fdout[2], fderr[2];
24 int failed_errno = failed_errno;
27 * In case of errors we must keep the promise to close FDs
28 * that have been passed in via ->in and ->out.
31 need_in = !cmd->no_stdin && cmd->in < 0;
42 need_out = !cmd->no_stdout
43 && !cmd->stdout_to_stderr
46 if (pipe(fdout) < 0) {
57 need_err = !cmd->no_stderr && cmd->err < 0;
59 if (pipe(fderr) < 0) {
70 error("cannot create pipe for %s: %s",
71 cmd->argv[0], strerror(failed_errno));
78 trace_argv_printf(cmd->argv, "trace: run_command:");
103 else if (cmd->stdout_to_stderr)
108 } else if (cmd->out > 1) {
113 if (cmd->dir && chdir(cmd->dir))
114 die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
117 for (; *cmd->env; cmd->env++) {
118 if (strchr(*cmd->env, '='))
119 putenv((char *)*cmd->env);
127 execv_git_cmd(cmd->argv);
129 execvp(cmd->argv[0], (char *const*) cmd->argv);
131 trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
136 error("cannot fork() for %s: %s", cmd->argv[0],
137 strerror(failed_errno = errno));
140 int fhin = 0, fhout = 1, fherr = 2;
141 const char **sargv = cmd->argv;
142 char **env = environ;
145 fhin = open("/dev/null", O_RDWR);
152 fherr = open("/dev/null", O_RDWR);
154 fherr = dup(fderr[1]);
157 fhout = open("/dev/null", O_RDWR);
158 else if (cmd->stdout_to_stderr)
161 fhout = dup(fdout[1]);
162 else if (cmd->out > 1)
163 fhout = dup(cmd->out);
166 die("chdir in start_command() not implemented");
168 env = make_augmented_environ(cmd->env);
171 cmd->argv = prepare_git_cmd(cmd->argv);
174 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env,
176 failed_errno = errno;
177 if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
178 error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
206 errno = failed_errno;
226 static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
228 int status, code = -1;
230 int failed_errno = 0;
232 while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
236 failed_errno = errno;
237 error("waitpid for %s failed: %s", argv0, strerror(errno));
238 } else if (waiting != pid) {
239 error("waitpid is confused (%s)", argv0);
240 } else if (WIFSIGNALED(status)) {
241 code = WTERMSIG(status);
242 error("%s died of signal %d", argv0, code);
244 * This return value is chosen so that code & 0xff
245 * mimics the exit code that a POSIX shell would report for
246 * a program that died from this signal.
249 } else if (WIFEXITED(status)) {
250 code = WEXITSTATUS(status);
252 * Convert special exit code when execvp failed.
256 failed_errno = ENOENT;
257 if (!silent_exec_failure)
258 error("cannot run %s: %s", argv0,
262 error("waitpid is confused (%s)", argv0);
264 errno = failed_errno;
268 int finish_command(struct child_process *cmd)
270 return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure);
273 int run_command(struct child_process *cmd)
275 int code = start_command(cmd);
278 return finish_command(cmd);
281 static void prepare_run_command_v_opt(struct child_process *cmd,
285 memset(cmd, 0, sizeof(*cmd));
287 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
288 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
289 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
290 cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
293 int run_command_v_opt(const char **argv, int opt)
295 struct child_process cmd;
296 prepare_run_command_v_opt(&cmd, argv, opt);
297 return run_command(&cmd);
300 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
302 struct child_process cmd;
303 prepare_run_command_v_opt(&cmd, argv, opt);
306 return run_command(&cmd);
310 static unsigned __stdcall run_thread(void *data)
312 struct async *async = data;
313 return async->proc(async->fd_for_proc, async->data);
317 int start_async(struct async *async)
321 if (pipe(pipe_out) < 0)
322 return error("cannot create pipe: %s", strerror(errno));
323 async->out = pipe_out[0];
326 /* Flush stdio before fork() to avoid cloning buffers */
330 if (async->pid < 0) {
331 error("fork (async) failed: %s", strerror(errno));
332 close_pair(pipe_out);
337 exit(!!async->proc(pipe_out[1], async->data));
341 async->fd_for_proc = pipe_out[1];
342 async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
344 error("cannot create thread: %s", strerror(errno));
345 close_pair(pipe_out);
352 int finish_async(struct async *async)
355 int ret = wait_or_whine(async->pid, "child process", 0);
358 if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
359 ret = error("waiting for thread failed: %lu", GetLastError());
360 else if (!GetExitCodeThread(async->tid, &ret))
361 ret = error("cannot get thread exit code: %lu", GetLastError());
362 CloseHandle(async->tid);
367 int run_hook(const char *index_file, const char *name, ...)
369 struct child_process hook;
370 const char **argv = NULL, *env[2];
371 char index[PATH_MAX];
374 size_t i = 0, alloc = 0;
376 if (access(git_path("hooks/%s", name), X_OK) < 0)
379 va_start(args, name);
380 ALLOC_GROW(argv, i + 1, alloc);
381 argv[i++] = git_path("hooks/%s", name);
383 ALLOC_GROW(argv, i + 1, alloc);
384 argv[i++] = va_arg(args, const char *);
388 memset(&hook, 0, sizeof(hook));
391 hook.stdout_to_stderr = 1;
393 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
399 ret = run_command(&hook);