1 files changed, 57 insertions, 17 deletions

diff --git a/run-command.c b/run-command.c
index 46be513c48..aad03ab705 100644
--- a/run-command.c
+++ b/run-command.c
@@ -4,10 +4,6 @@
 #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));
@@ -561,7 +557,12 @@ int finish_command(struct child_process *cmd)
 
 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);
@@ -626,6 +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)
@@ -684,6 +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));
 	}
 
@@ -794,19 +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);
 }