#include "cache.h"
#include "run-command.h"
-#include <sys/wait.h>
#include "exec_cmd.h"
-int run_command_v_opt(int argc, char **argv, int flags)
+static inline void close_pair(int fd[2])
{
- pid_t pid = fork();
-
- if (pid < 0)
- return -ERR_RUN_COMMAND_FORK;
- if (!pid) {
- if (flags & RUN_COMMAND_NO_STDIO) {
- int fd = open("/dev/null", O_RDWR);
- dup2(fd, 0);
- dup2(fd, 1);
- close(fd);
+ close(fd[0]);
+ close(fd[1]);
+}
+
+static inline void dup_devnull(int to)
+{
+ int fd = open("/dev/null", O_RDWR);
+ dup2(fd, to);
+ close(fd);
+}
+
+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;
}
- if (flags & RUN_GIT_CMD) {
- execv_git_cmd(argv);
- } else {
- execvp(argv[0], (char *const*) argv);
+ 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;
}
- die("exec %s failed.", argv[0]);
+ cmd->out = fdout[0];
}
- for (;;) {
- int status, code;
- int retval = waitpid(pid, &status, 0);
-
- if (retval < 0) {
- if (errno == EINTR)
- continue;
- error("waitpid failed (%s)", strerror(retval));
- return -ERR_RUN_COMMAND_WAITPID;
+
+ 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:");
+
+#ifndef WIN32
+ fflush(NULL);
+ cmd->pid = fork();
+ if (!cmd->pid) {
+ 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);
+ }
+
+ 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)
+ cmd->preexec_cb();
+ if (cmd->git_cmd) {
+ execv_git_cmd(cmd->argv);
+ } else {
+ execvp(cmd->argv[0], (char *const*) cmd->argv);
}
- if (retval != pid)
- return -ERR_RUN_COMMAND_WAITPID_WRONG_PID;
- if (WIFSIGNALED(status))
- return -ERR_RUN_COMMAND_WAITPID_SIGNAL;
+ trace_printf("trace: exec '%s' failed: %s\n", cmd->argv[0],
+ strerror(errno));
+ exit(127);
+ }
+ if (cmd->pid < 0)
+ error("cannot fork() for %s: %s", cmd->argv[0],
+ strerror(failed_errno = errno));
+#else
+{
+ int s0 = -1, s1 = -1, s2 = -1; /* backups of stdin, stdout, stderr */
+ const char **sargv = cmd->argv;
+ char **env = environ;
+
+ if (cmd->no_stdin) {
+ s0 = dup(0);
+ dup_devnull(0);
+ } else if (need_in) {
+ s0 = dup(0);
+ dup2(fdin[0], 0);
+ } else if (cmd->in) {
+ s0 = dup(0);
+ dup2(cmd->in, 0);
+ }
+
+ if (cmd->no_stderr) {
+ s2 = dup(2);
+ dup_devnull(2);
+ } else if (need_err) {
+ s2 = dup(2);
+ dup2(fderr[1], 2);
+ }
+
+ if (cmd->no_stdout) {
+ s1 = dup(1);
+ dup_devnull(1);
+ } else if (cmd->stdout_to_stderr) {
+ s1 = dup(1);
+ dup2(2, 1);
+ } else if (need_out) {
+ s1 = dup(1);
+ dup2(fdout[1], 1);
+ } else if (cmd->out > 1) {
+ s1 = dup(1);
+ dup2(cmd->out, 1);
+ }
+
+ if (cmd->dir)
+ die("chdir in start_command() not implemented");
+ if (cmd->env)
+ env = make_augmented_environ(cmd->env);
+
+ if (cmd->git_cmd) {
+ cmd->argv = prepare_git_cmd(cmd->argv);
+ }
+
+ cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, env);
+ 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 (s0 >= 0)
+ dup2(s0, 0), close(s0);
+ if (s1 >= 0)
+ dup2(s1, 1), close(s1);
+ if (s2 >= 0)
+ dup2(s2, 2), close(s2);
+}
+#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);
+ errno = failed_errno;
+ return -1;
+ }
+
+ if (need_in)
+ close(fdin[0]);
+ else if (cmd->in)
+ close(cmd->in);
- if (!WIFEXITED(status))
- return -ERR_RUN_COMMAND_WAITPID_NOEXIT;
+ if (need_out)
+ close(fdout[1]);
+ else if (cmd->out)
+ close(cmd->out);
+
+ if (need_err)
+ close(fderr[1]);
+
+ return 0;
+}
+
+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);
- if (code)
- return -code;
- return 0;
+ /*
+ * Convert special exit code when execvp failed.
+ */
+ if (code == 127) {
+ code = -1;
+ failed_errno = ENOENT;
+ if (!silent_exec_failure)
+ error("cannot run %s: %s", argv0,
+ strerror(ENOENT));
+ }
+ } else {
+ error("waitpid is confused (%s)", argv0);
+ }
+ errno = failed_errno;
+ return code;
+}
+
+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;
+}
+
+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);
+}
+
+#ifdef WIN32
+static unsigned __stdcall run_thread(void *data)
+{
+ struct async *async = data;
+ return async->proc(async->fd_for_proc, async->data);
+}
+#endif
+
+int start_async(struct async *async)
+{
+ int pipe_out[2];
+
+ if (pipe(pipe_out) < 0)
+ return error("cannot create pipe: %s", strerror(errno));
+ async->out = pipe_out[0];
+
+#ifndef WIN32
+ /* Flush stdio before fork() to avoid cloning buffers */
+ fflush(NULL);
+
+ async->pid = fork();
+ if (async->pid < 0) {
+ error("fork (async) failed: %s", strerror(errno));
+ close_pair(pipe_out);
+ return -1;
+ }
+ if (!async->pid) {
+ close(pipe_out[0]);
+ exit(!!async->proc(pipe_out[1], async->data));
}
+ close(pipe_out[1]);
+#else
+ async->fd_for_proc = pipe_out[1];
+ async->tid = (HANDLE) _beginthreadex(NULL, 0, run_thread, async, 0, NULL);
+ if (!async->tid) {
+ error("cannot create thread: %s", strerror(errno));
+ close_pair(pipe_out);
+ return -1;
+ }
+#endif
+ return 0;
}
-int run_command_v(int argc, char **argv)
+int finish_async(struct async *async)
{
- return run_command_v_opt(argc, argv, 0);
+#ifndef WIN32
+ int ret = wait_or_whine(async->pid, "child process", 0);
+#else
+ DWORD ret = 0;
+ if (WaitForSingleObject(async->tid, INFINITE) != WAIT_OBJECT_0)
+ ret = error("waiting for thread failed: %lu", GetLastError());
+ else if (!GetExitCodeThread(async->tid, &ret))
+ ret = error("cannot get thread exit code: %lu", GetLastError());
+ CloseHandle(async->tid);
+#endif
+ return ret;
}
-int run_command(const char *cmd, ...)
+int run_hook(const char *index_file, const char *name, ...)
{
- int argc;
- char *argv[MAX_RUN_COMMAND_ARGS];
- const char *arg;
- va_list param;
-
- va_start(param, cmd);
- argv[0] = (char*) cmd;
- argc = 1;
- while (argc < MAX_RUN_COMMAND_ARGS) {
- arg = argv[argc++] = va_arg(param, char *);
- if (!arg)
- break;
+ 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(param);
- if (MAX_RUN_COMMAND_ARGS <= argc)
- return error("too many args to run %s", cmd);
- return run_command_v_opt(argc, argv, 0);
+ 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;
}