1 files changed, 78 insertions, 37 deletions

diff --git a/run-command.c b/run-command.c
index 35a3ebf07b..aad03ab705 100644
--- a/run-command.c
+++ b/run-command.c
@@ -4,9 +4,12 @@
 #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);
+}
 
 struct child_to_clean {
 	pid_t pid;
@@ -281,6 +284,8 @@ 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
@@ -332,6 +337,7 @@ 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);
 			errno = failed_errno;
 			return -1;
 		}
@@ -518,6 +524,7 @@ fail_pipe:
 		else if (cmd->err)
 			close(cmd->err);
 		argv_array_clear(&cmd->args);
+		argv_array_clear(&cmd->env_array);
 		errno = failed_errno;
 		return -1;
 	}
@@ -544,42 +551,38 @@ 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);
 	return ret;
 }
 
 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);
@@ -624,6 +627,45 @@ static int async_die_is_recursing(void)
 	return ret != NULL;
 }
 
+#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
+
 #endif
 
 int start_async(struct async *async)
@@ -682,6 +724,7 @@ int start_async(struct async *async)
 			close(fdin[1]);
 		if (need_out)
 			close(fdout[0]);
+		git_atexit_clear();
 		exit(!!async->proc(proc_in, proc_out, async->data));
 	}
 
@@ -763,14 +806,13 @@ char *find_hook(const char *name)
 
 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 +835,18 @@ 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);
 }