| #include "cache.h" |
| #include "run-command.h" |
| #include "exec_cmd.h" |
| |
| static inline void close_pair(int fd[2]) |
| { |
| close(fd[0]); |
| close(fd[1]); |
| } |
| |
| #ifndef WIN32 |
| static inline void dup_devnull(int to) |
| { |
| int fd = open("/dev/null", O_RDWR); |
| dup2(fd, to); |
| close(fd); |
| } |
| #endif |
| |
| static const char **prepare_shell_cmd(const char **argv) |
| { |
| int argc, nargc = 0; |
| const char **nargv; |
| |
| for (argc = 0; argv[argc]; argc++) |
| ; /* just counting */ |
| /* +1 for NULL, +3 for "sh -c" plus extra $0 */ |
| nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3)); |
| |
| if (argc < 1) |
| die("BUG: shell command is empty"); |
| |
| if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) { |
| nargv[nargc++] = "sh"; |
| nargv[nargc++] = "-c"; |
| |
| if (argc < 2) |
| nargv[nargc++] = argv[0]; |
| else { |
| struct strbuf arg0 = STRBUF_INIT; |
| strbuf_addf(&arg0, "%s \"$@\"", argv[0]); |
| nargv[nargc++] = strbuf_detach(&arg0, NULL); |
| } |
| } |
| |
| for (argc = 0; argv[argc]; argc++) |
| nargv[nargc++] = argv[argc]; |
| nargv[nargc] = NULL; |
| |
| return nargv; |
| } |
| |
| #ifndef WIN32 |
| static int execv_shell_cmd(const char **argv) |
| { |
| const char **nargv = prepare_shell_cmd(argv); |
| trace_argv_printf(nargv, "trace: exec:"); |
| execvp(nargv[0], (char **)nargv); |
| free(nargv); |
| return -1; |
| } |
| #endif |
| |
| #ifndef WIN32 |
| static int child_err = 2; |
| static int child_notifier = -1; |
| |
| static void notify_parent(void) |
| { |
| /* |
| * execvp failed. If possible, we'd like to let start_command |
| * know, so failures like ENOENT can be handled right away; but |
| * otherwise, finish_command will still report the error. |
| */ |
| xwrite(child_notifier, "", 1); |
| } |
| |
| static NORETURN void die_child(const char *err, va_list params) |
| { |
| vwritef(child_err, "fatal: ", err, params); |
| exit(128); |
| } |
| |
| static void error_child(const char *err, va_list params) |
| { |
| vwritef(child_err, "error: ", err, params); |
| } |
| #endif |
| |
| static inline void set_cloexec(int fd) |
| { |
| int flags = fcntl(fd, F_GETFD); |
| if (flags >= 0) |
| fcntl(fd, F_SETFD, flags | FD_CLOEXEC); |
| } |
| |
| static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure) |
| { |
| int status, code = -1; |
| pid_t waiting; |
| int failed_errno = 0; |
| |
| while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR) |
| ; /* nothing */ |
| |
| if (waiting < 0) { |
| failed_errno = errno; |
| error("waitpid for %s failed: %s", argv0, strerror(errno)); |
| } else if (waiting != pid) { |
| error("waitpid is confused (%s)", argv0); |
| } else if (WIFSIGNALED(status)) { |
| code = WTERMSIG(status); |
| error("%s died of signal %d", argv0, code); |
| /* |
| * This return value is chosen so that code & 0xff |
| * mimics the exit code that a POSIX shell would report for |
| * a program that died from this signal. |
| */ |
| code -= 128; |
| } else if (WIFEXITED(status)) { |
| code = WEXITSTATUS(status); |
| /* |
| * Convert special exit code when execvp failed. |
| */ |
| if (code == 127) { |
| code = -1; |
| failed_errno = ENOENT; |
| } |
| } else { |
| error("waitpid is confused (%s)", argv0); |
| } |
| errno = failed_errno; |
| return code; |
| } |
| |
| int start_command(struct child_process *cmd) |
| { |
| int need_in, need_out, need_err; |
| int fdin[2], fdout[2], fderr[2]; |
| int failed_errno = failed_errno; |
| |
| /* |
| * In case of errors we must keep the promise to close FDs |
| * that have been passed in via ->in and ->out. |
| */ |
| |
| need_in = !cmd->no_stdin && cmd->in < 0; |
| if (need_in) { |
| if (pipe(fdin) < 0) { |
| failed_errno = errno; |
| if (cmd->out > 0) |
| close(cmd->out); |
| goto fail_pipe; |
| } |
| cmd->in = fdin[1]; |
| } |
| |
| need_out = !cmd->no_stdout |
| && !cmd->stdout_to_stderr |
| && cmd->out < 0; |
| if (need_out) { |
| if (pipe(fdout) < 0) { |
| failed_errno = errno; |
| if (need_in) |
| close_pair(fdin); |
| else if (cmd->in) |
| close(cmd->in); |
| goto fail_pipe; |
| } |
| cmd->out = fdout[0]; |
| } |
| |
| need_err = !cmd->no_stderr && cmd->err < 0; |
| if (need_err) { |
| if (pipe(fderr) < 0) { |
| failed_errno = errno; |
| if (need_in) |
| close_pair(fdin); |
| else if (cmd->in) |
| close(cmd->in); |
| if (need_out) |
| close_pair(fdout); |
| else if (cmd->out) |
| close(cmd->out); |
| fail_pipe: |
| error("cannot create pipe for %s: %s", |
| cmd->argv[0], strerror(failed_errno)); |
| errno = failed_errno; |
| return -1; |
| } |
| cmd->err = fderr[0]; |
| } |
| |
| trace_argv_printf(cmd->argv, "trace: run_command:"); |
| fflush(NULL); |
| |
| #ifndef WIN32 |
| { |
| int notify_pipe[2]; |
| if (pipe(notify_pipe)) |
| notify_pipe[0] = notify_pipe[1] = -1; |
| |
| cmd->pid = fork(); |
| if (!cmd->pid) { |
| /* |
| * Redirect the channel to write syscall error messages to |
| * before redirecting the process's stderr so that all die() |
| * in subsequent call paths use the parent's stderr. |
| */ |
| if (cmd->no_stderr || need_err) { |
| child_err = dup(2); |
| set_cloexec(child_err); |
| } |
| set_die_routine(die_child); |
| set_error_routine(error_child); |
| |
| close(notify_pipe[0]); |
| set_cloexec(notify_pipe[1]); |
| child_notifier = notify_pipe[1]; |
| atexit(notify_parent); |
| |
| if (cmd->no_stdin) |
| dup_devnull(0); |
| else if (need_in) { |
| dup2(fdin[0], 0); |
| close_pair(fdin); |
| } else if (cmd->in) { |
| dup2(cmd->in, 0); |
| close(cmd->in); |
| } |
| |
| if (cmd->no_stderr) |
| dup_devnull(2); |
| else if (need_err) { |
| dup2(fderr[1], 2); |
| close_pair(fderr); |
| } else if (cmd->err > 1) { |
| dup2(cmd->err, 2); |
| close(cmd->err); |
| } |
| |
| if (cmd->no_stdout) |
| dup_devnull(1); |
| else if (cmd->stdout_to_stderr) |
| dup2(2, 1); |
| else if (need_out) { |
| dup2(fdout[1], 1); |
| close_pair(fdout); |
| } else if (cmd->out > 1) { |
| dup2(cmd->out, 1); |
| close(cmd->out); |
| } |
| |
| if (cmd->dir && chdir(cmd->dir)) |
| die_errno("exec '%s': cd to '%s' failed", cmd->argv[0], |
| cmd->dir); |
| if (cmd->env) { |
| for (; *cmd->env; cmd->env++) { |
| if (strchr(*cmd->env, '=')) |
| putenv((char *)*cmd->env); |
| else |
| unsetenv(*cmd->env); |
| } |
| } |
| if (cmd->preexec_cb) { |
| /* |
| * We cannot predict what the pre-exec callback does. |
| * Forgo parent notification. |
| */ |
| close(child_notifier); |
| child_notifier = -1; |
| |
| cmd->preexec_cb(); |
| } |
| if (cmd->git_cmd) { |
| execv_git_cmd(cmd->argv); |
| } else if (cmd->use_shell) { |
| execv_shell_cmd(cmd->argv); |
| } else { |
| execvp(cmd->argv[0], (char *const*) cmd->argv); |
| } |
| if (errno == ENOENT) { |
| if (!cmd->silent_exec_failure) |
| error("cannot run %s: %s", cmd->argv[0], |
| strerror(ENOENT)); |
| exit(127); |
| } else { |
| die_errno("cannot exec '%s'", cmd->argv[0]); |
| } |
| } |
| if (cmd->pid < 0) |
| error("cannot fork() for %s: %s", cmd->argv[0], |
| strerror(failed_errno = errno)); |
| |
| /* |
| * Wait for child's execvp. If the execvp succeeds (or if fork() |
| * failed), EOF is seen immediately by the parent. Otherwise, the |
| * child process sends a single byte. |
| * Note that use of this infrastructure is completely advisory, |
| * therefore, we keep error checks minimal. |
| */ |
| close(notify_pipe[1]); |
| if (read(notify_pipe[0], ¬ify_pipe[1], 1) == 1) { |
| /* |
| * At this point we know that fork() succeeded, but execvp() |
| * failed. Errors have been reported to our stderr. |
| */ |
| wait_or_whine(cmd->pid, cmd->argv[0], |
| cmd->silent_exec_failure); |
| failed_errno = errno; |
| cmd->pid = -1; |
| } |
| close(notify_pipe[0]); |
| } |
| #else |
| { |
| int fhin = 0, fhout = 1, fherr = 2; |
| const char **sargv = cmd->argv; |
| char **env = environ; |
| |
| if (cmd->no_stdin) |
| fhin = open("/dev/null", O_RDWR); |
| else if (need_in) |
| fhin = dup(fdin[0]); |
| else if (cmd->in) |
| fhin = dup(cmd->in); |
| |
| if (cmd->no_stderr) |
| fherr = open("/dev/null", O_RDWR); |
| else if (need_err) |
| fherr = dup(fderr[1]); |
| else if (cmd->err > 2) |
| fherr = dup(cmd->err); |
| |
| if (cmd->no_stdout) |
| fhout = open("/dev/null", O_RDWR); |
| else if (cmd->stdout_to_stderr) |
| fhout = dup(fherr); |
| else if (need_out) |
| fhout = dup(fdout[1]); |
| else if (cmd->out > 1) |
| fhout = dup(cmd->out); |
| |
| if (cmd->env) |
| env = make_augmented_environ(cmd->env); |
| |
| if (cmd->git_cmd) { |
| cmd->argv = prepare_git_cmd(cmd->argv); |
| } else if (cmd->use_shell) { |
| cmd->argv = prepare_shell_cmd(cmd->argv); |
| } |
| |
| cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env, cmd->dir, |
| fhin, fhout, fherr); |
| failed_errno = errno; |
| if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT)) |
| error("cannot spawn %s: %s", cmd->argv[0], strerror(errno)); |
| |
| if (cmd->env) |
| free_environ(env); |
| if (cmd->git_cmd) |
| free(cmd->argv); |
| |
| cmd->argv = sargv; |
| if (fhin != 0) |
| close(fhin); |
| if (fhout != 1) |
| close(fhout); |
| if (fherr != 2) |
| close(fherr); |
| } |
| #endif |
| |
| if (cmd->pid < 0) { |
| if (need_in) |
| close_pair(fdin); |
| else if (cmd->in) |
| close(cmd->in); |
| if (need_out) |
| close_pair(fdout); |
| else if (cmd->out) |
| close(cmd->out); |
| if (need_err) |
| close_pair(fderr); |
| else if (cmd->err) |
| close(cmd->err); |
| errno = failed_errno; |
| return -1; |
| } |
| |
| if (need_in) |
| close(fdin[0]); |
| else if (cmd->in) |
| close(cmd->in); |
| |
| if (need_out) |
| close(fdout[1]); |
| else if (cmd->out) |
| close(cmd->out); |
| |
| if (need_err) |
| close(fderr[1]); |
| else if (cmd->err) |
| close(cmd->err); |
| |
| return 0; |
| } |
| |
| int finish_command(struct child_process *cmd) |
| { |
| return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure); |
| } |
| |
| int run_command(struct child_process *cmd) |
| { |
| int code = start_command(cmd); |
| if (code) |
| return code; |
| return finish_command(cmd); |
| } |
| |
| static void prepare_run_command_v_opt(struct child_process *cmd, |
| const char **argv, |
| int opt) |
| { |
| memset(cmd, 0, sizeof(*cmd)); |
| cmd->argv = argv; |
| cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0; |
| cmd->git_cmd = opt & RUN_GIT_CMD ? 1 : 0; |
| cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0; |
| cmd->silent_exec_failure = opt & RUN_SILENT_EXEC_FAILURE ? 1 : 0; |
| cmd->use_shell = opt & RUN_USING_SHELL ? 1 : 0; |
| } |
| |
| int run_command_v_opt(const char **argv, int opt) |
| { |
| struct child_process cmd; |
| prepare_run_command_v_opt(&cmd, argv, opt); |
| return run_command(&cmd); |
| } |
| |
| int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env) |
| { |
| struct child_process cmd; |
| prepare_run_command_v_opt(&cmd, argv, opt); |
| cmd.dir = dir; |
| cmd.env = env; |
| return run_command(&cmd); |
| } |
| |
| #ifndef NO_PTHREADS |
| static pthread_t main_thread; |
| static int main_thread_set; |
| static pthread_key_t async_key; |
| |
| static void *run_thread(void *data) |
| { |
| struct async *async = data; |
| intptr_t ret; |
| |
| pthread_setspecific(async_key, async); |
| ret = async->proc(async->proc_in, async->proc_out, async->data); |
| return (void *)ret; |
| } |
| |
| static NORETURN void die_async(const char *err, va_list params) |
| { |
| vreportf("fatal: ", err, params); |
| |
| if (!pthread_equal(main_thread, pthread_self())) { |
| struct async *async = pthread_getspecific(async_key); |
| if (async->proc_in >= 0) |
| close(async->proc_in); |
| if (async->proc_out >= 0) |
| close(async->proc_out); |
| pthread_exit((void *)128); |
| } |
| |
| exit(128); |
| } |
| #endif |
| |
| int start_async(struct async *async) |
| { |
| int need_in, need_out; |
| int fdin[2], fdout[2]; |
| int proc_in, proc_out; |
| |
| need_in = async->in < 0; |
| if (need_in) { |
| if (pipe(fdin) < 0) { |
| if (async->out > 0) |
| close(async->out); |
| return error("cannot create pipe: %s", strerror(errno)); |
| } |
| async->in = fdin[1]; |
| } |
| |
| need_out = async->out < 0; |
| if (need_out) { |
| if (pipe(fdout) < 0) { |
| if (need_in) |
| close_pair(fdin); |
| else if (async->in) |
| close(async->in); |
| return error("cannot create pipe: %s", strerror(errno)); |
| } |
| async->out = fdout[0]; |
| } |
| |
| if (need_in) |
| proc_in = fdin[0]; |
| else if (async->in) |
| proc_in = async->in; |
| else |
| proc_in = -1; |
| |
| if (need_out) |
| proc_out = fdout[1]; |
| else if (async->out) |
| proc_out = async->out; |
| else |
| proc_out = -1; |
| |
| #ifdef NO_PTHREADS |
| /* Flush stdio before fork() to avoid cloning buffers */ |
| fflush(NULL); |
| |
| async->pid = fork(); |
| if (async->pid < 0) { |
| error("fork (async) failed: %s", strerror(errno)); |
| goto error; |
| } |
| if (!async->pid) { |
| if (need_in) |
| close(fdin[1]); |
| if (need_out) |
| close(fdout[0]); |
| exit(!!async->proc(proc_in, proc_out, async->data)); |
| } |
| |
| if (need_in) |
| close(fdin[0]); |
| else if (async->in) |
| close(async->in); |
| |
| if (need_out) |
| close(fdout[1]); |
| else if (async->out) |
| close(async->out); |
| #else |
| if (!main_thread_set) { |
| /* |
| * We assume that the first time that start_async is called |
| * it is from the main thread. |
| */ |
| main_thread_set = 1; |
| main_thread = pthread_self(); |
| pthread_key_create(&async_key, NULL); |
| set_die_routine(die_async); |
| } |
| |
| if (proc_in >= 0) |
| set_cloexec(proc_in); |
| if (proc_out >= 0) |
| set_cloexec(proc_out); |
| async->proc_in = proc_in; |
| async->proc_out = proc_out; |
| { |
| int err = pthread_create(&async->tid, NULL, run_thread, async); |
| if (err) { |
| error("cannot create thread: %s", strerror(err)); |
| goto error; |
| } |
| } |
| #endif |
| return 0; |
| |
| error: |
| if (need_in) |
| close_pair(fdin); |
| else if (async->in) |
| close(async->in); |
| |
| if (need_out) |
| close_pair(fdout); |
| else if (async->out) |
| close(async->out); |
| return -1; |
| } |
| |
| int finish_async(struct async *async) |
| { |
| #ifdef NO_PTHREADS |
| return wait_or_whine(async->pid, "child process", 0); |
| #else |
| void *ret = (void *)(intptr_t)(-1); |
| |
| if (pthread_join(async->tid, &ret)) |
| error("pthread_join failed"); |
| return (int)(intptr_t)ret; |
| #endif |
| } |
| |
| int run_hook(const char *index_file, const char *name, ...) |
| { |
| struct child_process hook; |
| const char **argv = NULL, *env[2]; |
| char index[PATH_MAX]; |
| va_list args; |
| int ret; |
| size_t i = 0, alloc = 0; |
| |
| if (access(git_path("hooks/%s", name), X_OK) < 0) |
| return 0; |
| |
| va_start(args, name); |
| ALLOC_GROW(argv, i + 1, alloc); |
| argv[i++] = git_path("hooks/%s", name); |
| while (argv[i-1]) { |
| ALLOC_GROW(argv, i + 1, alloc); |
| argv[i++] = va_arg(args, const char *); |
| } |
| va_end(args); |
| |
| memset(&hook, 0, sizeof(hook)); |
| hook.argv = argv; |
| hook.no_stdin = 1; |
| hook.stdout_to_stderr = 1; |
| if (index_file) { |
| snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file); |
| env[0] = index; |
| env[1] = NULL; |
| hook.env = env; |
| } |
| |
| ret = run_command(&hook); |
| free(argv); |
| return ret; |
| } |