[PATCH] When exec'ing sub-commands, fall back on execvp (the PATH)

@@ -34,15 +34,15 @@ int execv_git_cmd(const char **argv)
 {
 	char git_command[PATH_MAX + 1];
 	int i;
+	int rc;
 	const char *paths[] = { current_exec_path,
 				getenv(EXEC_PATH_ENVIRONMENT),
 				builtin_exec_path };
+	const char *tmp;
+	size_t len;
 
 	for (i = 0; i < ARRAY_SIZE(paths); ++i) {
-		size_t len;
-		int rc;
 		const char *exec_dir = paths[i];
-		const char *tmp;
 
 		if (!exec_dir || !*exec_dir) continue;
 

@@ -106,8 +106,26 @@ int execv_git_cmd(const char **argv)
 
 		argv[0] = tmp;
 	}
-	return -1;
 
+	rc = snprintf(git_command, sizeof(git_command), "git-%s", argv[0]);
+	if (rc < 0 || rc >= sizeof(git_command) - len) {
+		fprintf(stderr, "git: command name given is too long.\n");
+		return -1;
+	}
+
+	tmp = argv[0];
+	argv[0] = git_command;
+
+	trace_argv_printf(argv, -1, "trace: exec:");
+
+	/* execve() can only ever return if it fails */
+	execvp(git_command, (char **)argv);
+
+	trace_printf("trace: exec failed: %s\n", strerror(errno));
+
+	argv[0] = tmp;
+
+	return -1;
 }
 
 

@@ -36,7 +36,8 @@ int execv_git_cmd(const char **argv)
 	int i;
 	const char *paths[] = { current_exec_path,
 				getenv(EXEC_PATH_ENVIRONMENT),
-				builtin_exec_path };
+				builtin_exec_path,
+				"" };
 
 	for (i = 0; i < ARRAY_SIZE(paths); ++i) {
 		size_t len;

@@ -44,9 +45,12 @@ int execv_git_cmd(const char **argv)
 		const char *exec_dir = paths[i];
 		const char *tmp;
 
-		if (!exec_dir || !*exec_dir) continue;
+		if (!exec_dir) continue;
 
-		if (*exec_dir != '/') {
+		if (!*exec_dir)
+			/* try PATH */
+			*git_command = '\0';
+		else if (*exec_dir != '/') {
 			if (!getcwd(git_command, sizeof(git_command))) {
 				fprintf(stderr, "git: cannot determine "
 					"current directory: %s\n",

@@ -81,7 +85,7 @@ int execv_git_cmd(const char **argv)
 
 		len = strlen(git_command);
 		rc = snprintf(git_command + len, sizeof(git_command) - len,
-			      "/git-%s", argv[0]);
+			      "%sgit-%s", *exec_dir ? "/" : "", argv[0]);
 		if (rc < 0 || rc >= sizeof(git_command) - len) {
 			fprintf(stderr,
 				"git: command name given is too long.\n");