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 static const char **prepare_shell_cmd(const char **argv)
25 for (argc = 0; argv[argc]; argc++)
27 /* +1 for NULL, +3 for "sh -c" plus extra $0 */
28 nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
31 die("BUG: shell command is empty");
33 if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
34 nargv[nargc++] = "sh";
35 nargv[nargc++] = "-c";
38 nargv[nargc++] = argv[0];
40 struct strbuf arg0 = STRBUF_INIT;
41 strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
42 nargv[nargc++] = strbuf_detach(&arg0, NULL);
46 for (argc = 0; argv[argc]; argc++)
47 nargv[nargc++] = argv[argc];
54 static int execv_shell_cmd(const char **argv)
56 const char **nargv = prepare_shell_cmd(argv);
57 trace_argv_printf(nargv, "trace: exec:");
58 execvp(nargv[0], (char **)nargv);
64 int start_command(struct child_process *cmd)
66 int need_in, need_out, need_err;
67 int fdin[2], fdout[2], fderr[2];
68 int failed_errno = failed_errno;
71 * In case of errors we must keep the promise to close FDs
72 * that have been passed in via ->in and ->out.
75 need_in = !cmd->no_stdin && cmd->in < 0;
86 need_out = !cmd->no_stdout
87 && !cmd->stdout_to_stderr
90 if (pipe(fdout) < 0) {
101 need_err = !cmd->no_stderr && cmd->err < 0;
103 if (pipe(fderr) < 0) {
104 failed_errno = errno;
114 error("cannot create pipe for %s: %s",
115 cmd->argv[0], strerror(failed_errno));
116 errno = failed_errno;
122 trace_argv_printf(cmd->argv, "trace: run_command:");
133 } else if (cmd->in) {
147 else if (cmd->stdout_to_stderr)
152 } else if (cmd->out > 1) {
157 if (cmd->dir && chdir(cmd->dir))
158 die_errno("exec '%s': cd to '%s' failed", cmd->argv[0],
161 for (; *cmd->env; cmd->env++) {
162 if (strchr(*cmd->env, '='))
163 putenv((char *)*cmd->env);
171 execv_git_cmd(cmd->argv);
172 } else if (cmd->use_shell) {
173 execv_shell_cmd(cmd->argv);
175 execvp(cmd->argv[0], (char *const*) cmd->argv);
177 trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
182 error("cannot fork() for %s: %s", cmd->argv[0],
183 strerror(failed_errno = errno));
186 int fhin = 0, fhout = 1, fherr = 2;
187 const char **sargv = cmd->argv;
188 char **env = environ;
191 fhin = open("/dev/null", O_RDWR);
198 fherr = open("/dev/null", O_RDWR);
200 fherr = dup(fderr[1]);
203 fhout = open("/dev/null", O_RDWR);
204 else if (cmd->stdout_to_stderr)
207 fhout = dup(fdout[1]);
208 else if (cmd->out > 1)
209 fhout = dup(cmd->out);
212 die("chdir in start_command() not implemented");
214 env = make_augmented_environ(cmd->env);
217 cmd->argv = prepare_git_cmd(cmd->argv);
218 } else if (cmd->use_shell) {
219 cmd->argv = prepare_shell_cmd(cmd->argv);
222 cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env,
224 failed_errno = errno;
225 if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
226 error("cannot spawn %s: %s", cmd->argv[0], strerror(errno));
254 errno = failed_errno;
274 static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
276 int status, code = -1;
278 int failed_errno = 0;
280 while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
284 failed_errno = errno;
285 error("waitpid for %s failed: %s", argv0, strerror(errno));
286 } else if (waiting != pid) {
287 error("waitpid is confused (%s)", argv0);
288 } else if (WIFSIGNALED(status)) {
289 code = WTERMSIG(status);
290 error("%s died of signal %d", argv0, code);
292 * This return value is chosen so that code & 0xff
293 * mimics the exit code that a POSIX shell would report for
294 * a program that died from this signal.
297 } else if (WIFEXITED(status)) {
298 code = WEXITSTATUS(status);
300 * Convert special exit code when execvp failed.
304 failed_errno = ENOENT;
305 if (!silent_exec_failure)
306 error("cannot run %s: %s", argv0,
310 error("waitpid is confused (%s)", argv0);
312 errno = failed_errno;
316 int finish_command(struct child_process *cmd)
318 return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure);
321 int run_command(struct child_process *cmd)
323 int code = start_command(cmd);
326 return finish_command(cmd);
329 static void prepare_run_command_v_opt(struct child_process *cmd,
333 memset(cmd, 0, sizeof(*cmd));
335 cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;
336 cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0;
337 cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;
338 cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0;
339 cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0;
342 int run_command_v_opt(const char **argv, int opt)
344 struct child_process cmd;
345 prepare_run_command_v_opt(&cmd, argv, opt);
346 return run_command(&cmd);
349 int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env)
351 struct child_process cmd;
352 prepare_run_command_v_opt(&cmd, argv, opt);
355 return run_command(&cmd);
359 static unsigned __stdcall run_thread(void *data)
361 struct async *async = data;
362 return async->proc(async->fd_for_proc, async->data);
366 int start_async(struct async *async)
370 if (pipe(pipe_out) < 0)
371 return error("cannot create pipe: %s", strerror(errno));
372 async->out = pipe_out[0];
375 /* Flush stdio before fork() to avoid cloning buffers */
379 if (async->pid < 0) {
380 error("fork (async) failed: %s", strerror(errno));
381 close_pair(pipe_out);
386 exit(!!async->proc(pipe_out[1], async->data));
390 async->fd_for_proc = pipe_out[1];
391 async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
393 error("cannot create thread: %s", strerror(errno));
394 close_pair(pipe_out);
401 int finish_async(struct async *async)
404 int ret = wait_or_whine(async->pid, "child process", 0);
407 if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
408 ret = error("waiting for thread failed: %lu", GetLastError());
409 else if (!GetExitCodeThread(async->tid, &ret))
410 ret = error("cannot get thread exit code: %lu", GetLastError());
411 CloseHandle(async->tid);
416 int run_hook(const char *index_file, const char *name, ...)
418 struct child_process hook;
419 const char **argv = NULL, *env[2];
420 char index[PATH_MAX];
423 size_t i = 0, alloc = 0;
425 if (access(git_path("hooks/%s", name), X_OK) < 0)
428 va_start(args, name);
429 ALLOC_GROW(argv, i + 1, alloc);
430 argv[i++] = git_path("hooks/%s", name);
432 ALLOC_GROW(argv, i + 1, alloc);
433 argv[i++] = va_arg(args, const char *);
437 memset(&hook, 0, sizeof(hook));
440 hook.stdout_to_stderr = 1;
442 snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
448 ret = run_command(&hook);