1 files changed, 76 insertions, 50 deletions

diff --git a/run-command.c b/run-command.c
index 3277cf797e..2392b1efe8 100644
--- a/run-command.c
+++ b/run-command.c
@@ -11,6 +11,12 @@ void child_process_init(struct child_process *child)
 	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;
 	struct child_to_clean *next;
@@ -18,26 +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)
@@ -151,50 +158,41 @@ int sane_execvp(const char *file, char * const argv[])
 	return -1;
 }
 
-static const char **prepare_shell_cmd(const char **argv)
+static const char **prepare_shell_cmd(struct argv_array *out, 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)
+	if (!argv[0])
 		die("BUG: shell command is empty");
 
 	if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
 #ifndef GIT_WINDOWS_NATIVE
-		nargv[nargc++] = SHELL_PATH;
+		argv_array_push(out, SHELL_PATH);
 #else
-		nargv[nargc++] = "sh";
+		argv_array_push(out, "sh");
 #endif
-		nargv[nargc++] = "-c";
-
-		if (argc < 2)
-			nargv[nargc++] = argv[0];
-		else {
-			struct strbuf arg0 = STRBUF_INIT;
-			strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
-			nargv[nargc++] = strbuf_detach(&arg0, NULL);
-		}
-	}
+		argv_array_push(out, "-c");
 
-	for (argc = 0; argv[argc]; argc++)
-		nargv[nargc++] = argv[argc];
-	nargv[nargc] = NULL;
+		/*
+		 * If we have no extra arguments, we do not even need to
+		 * bother with the "$@" magic.
+		 */
+		if (!argv[1])
+			argv_array_push(out, argv[0]);
+		else
+			argv_array_pushf(out, "%s \"$@\"", argv[0]);
+	}
 
-	return nargv;
+	argv_array_pushv(out, argv);
+	return out->argv;
 }
 
 #ifndef GIT_WINDOWS_NATIVE
 static int execv_shell_cmd(const char **argv)
 {
-	const char **nargv = prepare_shell_cmd(argv);
-	trace_argv_printf(nargv, "trace: exec:");
-	sane_execvp(nargv[0], (char **)nargv);
-	free(nargv);
+	struct argv_array nargv = ARGV_ARRAY_INIT;
+	prepare_shell_cmd(&nargv, argv);
+	trace_argv_printf(nargv.argv, "trace: exec:");
+	sane_execvp(nargv.argv[0], (char **)nargv.argv);
+	argv_array_clear(&nargv);
 	return -1;
 }
 #endif
@@ -220,7 +218,7 @@ 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;
@@ -228,6 +226,8 @@ 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;
@@ -324,8 +324,7 @@ 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);
-			argv_array_clear(&cmd->env_array);
+			child_process_clear(cmd);
 			errno = failed_errno;
 			return -1;
 		}
@@ -437,7 +436,7 @@ 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;
 	}
@@ -447,6 +446,7 @@ fail_pipe:
 {
 	int fhin = 0, fhout = 1, fherr = 2;
 	const char **sargv = cmd->argv;
+	struct argv_array nargv = ARGV_ARRAY_INIT;
 
 	if (cmd->no_stdin)
 		fhin = open("/dev/null", O_RDWR);
@@ -472,9 +472,9 @@ fail_pipe:
 		fhout = dup(cmd->out);
 
 	if (cmd->git_cmd)
-		cmd->argv = prepare_git_cmd(cmd->argv);
+		cmd->argv = prepare_git_cmd(&nargv, cmd->argv);
 	else if (cmd->use_shell)
-		cmd->argv = prepare_shell_cmd(cmd->argv);
+		cmd->argv = prepare_shell_cmd(&nargv, cmd->argv);
 
 	cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env,
 			cmd->dir, fhin, fhout, fherr);
@@ -484,9 +484,7 @@ fail_pipe:
 	if (cmd->clean_on_exit && cmd->pid >= 0)
 		mark_child_for_cleanup(cmd->pid);
 
-	if (cmd->git_cmd)
-		free(cmd->argv);
-
+	argv_array_clear(&nargv);
 	cmd->argv = sargv;
 	if (fhin != 0)
 		close(fhin);
@@ -510,8 +508,7 @@ fail_pipe:
 			close_pair(fderr);
 		else if (cmd->err)
 			close(cmd->err);
-		argv_array_clear(&cmd->args);
-		argv_array_clear(&cmd->env_array);
+		child_process_clear(cmd);
 		errno = failed_errno;
 		return -1;
 	}
@@ -536,12 +533,17 @@ fail_pipe:
 
 int finish_command(struct child_process *cmd)
 {
-	int ret = wait_or_whine(cmd->pid, cmd->argv[0]);
-	argv_array_clear(&cmd->args);
-	argv_array_clear(&cmd->env_array);
+	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;
@@ -595,7 +597,7 @@ 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);
@@ -614,6 +616,18 @@ 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());
+}
+
+void NORETURN async_exit(int code)
+{
+	pthread_exit((void *)(intptr_t)code);
+}
+
 #else
 
 static struct {
@@ -653,6 +667,17 @@ int git_atexit(void (*handler)(void))
 }
 #define atexit git_atexit
 
+static int process_is_async;
+int in_async(void)
+{
+	return process_is_async;
+}
+
+void NORETURN async_exit(int code)
+{
+	exit(code);
+}
+
 #endif
 
 int start_async(struct async *async)
@@ -712,6 +737,7 @@ int start_async(struct async *async)
 		if (need_out)
 			close(fdout[0]);
 		git_atexit_clear();
+		process_is_async = 1;
 		exit(!!async->proc(proc_in, proc_out, async->data));
 	}
 
@@ -772,7 +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);