1 files changed, 125 insertions, 69 deletions

diff --git a/run-command.c b/run-command.c
index 35a3ebf07b..13fa452e8c 100644
--- a/run-command.c
+++ b/run-command.c
@@ -4,9 +4,18 @@
 #include "sigchain.h"
 #include "argv-array.h"
 
-#ifndef SHELL_PATH
-# define SHELL_PATH "/bin/sh"
-#endif
+void child_process_init(struct child_process *child)
+{
+	memset(child, 0, sizeof(*child));
+	argv_array_init(&child->args);
+	argv_array_init(&child->env_array);
+}
+
+void child_process_clear(struct child_process *child)
+{
+	argv_array_clear(&child->args);
+	argv_array_clear(&child->env_array);
+}
 
 struct child_to_clean {
 	pid_t pid;
@@ -15,26 +24,27 @@ struct child_to_clean {
 static struct child_to_clean *children_to_clean;
 static int installed_child_cleanup_handler;
 
-static void cleanup_children(int sig)
+static void cleanup_children(int sig, int in_signal)
 {
 	while (children_to_clean) {
 		struct child_to_clean *p = children_to_clean;
 		children_to_clean = p->next;
 		kill(p->pid, sig);
-		free(p);
+		if (!in_signal)
+			free(p);
 	}
 }
 
 static void cleanup_children_on_signal(int sig)
 {
-	cleanup_children(sig);
+	cleanup_children(sig, 1);
 	sigchain_pop(sig);
 	raise(sig);
 }
 
 static void cleanup_children_on_exit(void)
 {
-	cleanup_children(SIGTERM);
+	cleanup_children(SIGTERM, 0);
 }
 
 static void mark_child_for_cleanup(pid_t pid)
@@ -197,7 +207,6 @@ static int execv_shell_cmd(const char **argv)
 #endif
 
 #ifndef GIT_WINDOWS_NATIVE
-static int child_err = 2;
 static int child_notifier = -1;
 
 static void notify_parent(void)
@@ -209,17 +218,6 @@ static void notify_parent(void)
 	 */
 	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)
@@ -229,7 +227,7 @@ static inline void set_cloexec(int fd)
 		fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
 }
 
-static int wait_or_whine(pid_t pid, const char *argv0)
+static int wait_or_whine(pid_t pid, const char *argv0, int in_signal)
 {
 	int status, code = -1;
 	pid_t waiting;
@@ -237,6 +235,8 @@ static int wait_or_whine(pid_t pid, const char *argv0)
 
 	while ((waiting = waitpid(pid, &status, 0)) < 0 && errno == EINTR)
 		;	/* nothing */
+	if (in_signal)
+		return 0;
 
 	if (waiting < 0) {
 		failed_errno = errno;
@@ -281,6 +281,8 @@ int start_command(struct child_process *cmd)
 
 	if (!cmd->argv)
 		cmd->argv = cmd->args.argv;
+	if (!cmd->env)
+		cmd->env = cmd->env_array.argv;
 
 	/*
 	 * In case of errors we must keep the promise to close FDs
@@ -331,7 +333,7 @@ int start_command(struct child_process *cmd)
 fail_pipe:
 			error("cannot create %s pipe for %s: %s",
 				str, cmd->argv[0], strerror(failed_errno));
-			argv_array_clear(&cmd->args);
+			child_process_clear(cmd);
 			errno = failed_errno;
 			return -1;
 		}
@@ -356,11 +358,10 @@ fail_pipe:
 		 * in subsequent call paths use the parent's stderr.
 		 */
 		if (cmd->no_stderr || need_err) {
-			child_err = dup(2);
+			int child_err = dup(2);
 			set_cloexec(child_err);
+			set_error_handle(fdopen(child_err, "w"));
 		}
-		set_die_routine(die_child);
-		set_error_routine(error_child);
 
 		close(notify_pipe[0]);
 		set_cloexec(notify_pipe[1]);
@@ -444,7 +445,7 @@ fail_pipe:
 		 * 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]);
+		wait_or_whine(cmd->pid, cmd->argv[0], 0);
 		failed_errno = errno;
 		cmd->pid = -1;
 	}
@@ -517,7 +518,7 @@ fail_pipe:
 			close_pair(fderr);
 		else if (cmd->err)
 			close(cmd->err);
-		argv_array_clear(&cmd->args);
+		child_process_clear(cmd);
 		errno = failed_errno;
 		return -1;
 	}
@@ -542,44 +543,45 @@ fail_pipe:
 
 int finish_command(struct child_process *cmd)
 {
-	int ret = wait_or_whine(cmd->pid, cmd->argv[0]);
-	argv_array_clear(&cmd->args);
+	int ret = wait_or_whine(cmd->pid, cmd->argv[0], 0);
+	child_process_clear(cmd);
 	return ret;
 }
 
+int finish_command_in_signal(struct child_process *cmd)
+{
+	return wait_or_whine(cmd->pid, cmd->argv[0], 1);
+}
+
+
 int run_command(struct child_process *cmd)
 {
-	int code = start_command(cmd);
+	int code;
+
+	if (cmd->out < 0 || cmd->err < 0)
+		die("BUG: run_command with a pipe can cause deadlock");
+
+	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;
-	cmd->clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 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);
+	return run_command_v_opt_cd_env(argv, opt, NULL, NULL);
 }
 
 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);
+	struct child_process cmd = CHILD_PROCESS_INIT;
+	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;
+	cmd.clean_on_exit = opt & RUN_CLEAN_ON_EXIT ? 1 : 0;
 	cmd.dir = dir;
 	cmd.env = env;
 	return run_command(&cmd);
@@ -605,7 +607,7 @@ static NORETURN void die_async(const char *err, va_list params)
 {
 	vreportf("fatal: ", err, params);
 
-	if (!pthread_equal(main_thread, pthread_self())) {
+	if (in_async()) {
 		struct async *async = pthread_getspecific(async_key);
 		if (async->proc_in >= 0)
 			close(async->proc_in);
@@ -624,6 +626,58 @@ static int async_die_is_recursing(void)
 	return ret != NULL;
 }
 
+int in_async(void)
+{
+	if (!main_thread_set)
+		return 0; /* no asyncs started yet */
+	return !pthread_equal(main_thread, pthread_self());
+}
+
+#else
+
+static struct {
+	void (**handlers)(void);
+	size_t nr;
+	size_t alloc;
+} git_atexit_hdlrs;
+
+static int git_atexit_installed;
+
+static void git_atexit_dispatch(void)
+{
+	size_t i;
+
+	for (i=git_atexit_hdlrs.nr ; i ; i--)
+		git_atexit_hdlrs.handlers[i-1]();
+}
+
+static void git_atexit_clear(void)
+{
+	free(git_atexit_hdlrs.handlers);
+	memset(&git_atexit_hdlrs, 0, sizeof(git_atexit_hdlrs));
+	git_atexit_installed = 0;
+}
+
+#undef atexit
+int git_atexit(void (*handler)(void))
+{
+	ALLOC_GROW(git_atexit_hdlrs.handlers, git_atexit_hdlrs.nr + 1, git_atexit_hdlrs.alloc);
+	git_atexit_hdlrs.handlers[git_atexit_hdlrs.nr++] = handler;
+	if (!git_atexit_installed) {
+		if (atexit(&git_atexit_dispatch))
+			return -1;
+		git_atexit_installed = 1;
+	}
+	return 0;
+}
+#define atexit git_atexit
+
+static int process_is_async;
+int in_async(void)
+{
+	return process_is_async;
+}
+
 #endif
 
 int start_async(struct async *async)
@@ -682,6 +736,8 @@ int start_async(struct async *async)
 			close(fdin[1]);
 		if (need_out)
 			close(fdout[0]);
+		git_atexit_clear();
+		process_is_async = 1;
 		exit(!!async->proc(proc_in, proc_out, async->data));
 	}
 
@@ -742,7 +798,7 @@ error:
 int finish_async(struct async *async)
 {
 #ifdef NO_PTHREADS
-	return wait_or_whine(async->pid, "child process");
+	return wait_or_whine(async->pid, "child process", 0);
 #else
 	void *ret = (void *)(intptr_t)(-1);
 
@@ -752,25 +808,26 @@ int finish_async(struct async *async)
 #endif
 }
 
-char *find_hook(const char *name)
+const char *find_hook(const char *name)
 {
-	char *path = git_path("hooks/%s", name);
-	if (access(path, X_OK) < 0)
-		path = NULL;
+	static struct strbuf path = STRBUF_INIT;
 
-	return path;
+	strbuf_reset(&path);
+	strbuf_git_path(&path, "hooks/%s", name);
+	if (access(path.buf, X_OK) < 0)
+		return NULL;
+	return path.buf;
 }
 
 int run_hook_ve(const char *const *env, const char *name, va_list args)
 {
-	struct child_process hook;
+	struct child_process hook = CHILD_PROCESS_INIT;
 	const char *p;
 
 	p = find_hook(name);
 	if (!p)
 		return 0;
 
-	memset(&hook, 0, sizeof(hook));
 	argv_array_push(&hook.args, p);
 	while ((p = va_arg(args, const char *)))
 		argv_array_push(&hook.args, p);
@@ -793,19 +850,18 @@ int run_hook_le(const char *const *env, const char *name, ...)
 	return ret;
 }
 
-int run_hook_with_custom_index(const char *index_file, const char *name, ...)
+int capture_command(struct child_process *cmd, struct strbuf *buf, size_t hint)
 {
-	const char *hook_env[3] =  { NULL };
-	char index[PATH_MAX];
-	va_list args;
-	int ret;
-
-	snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", index_file);
-	hook_env[0] = index;
+	cmd->out = -1;
+	if (start_command(cmd) < 0)
+		return -1;
 
-	va_start(args, name);
-	ret = run_hook_ve(hook_env, name, args);
-	va_end(args);
+	if (strbuf_read(buf, cmd->out, hint) < 0) {
+		close(cmd->out);
+		finish_command(cmd); /* throw away exit code */
+		return -1;
+	}
 
-	return ret;
+	close(cmd->out);
+	return finish_command(cmd);
 }