Merge branch 'lt/run'

* lt/run:
  Check for IO errors after running a command
  Clean up internal command handling

git.c

@@ -216,14 +216,53 @@ const char git_version_string[] = GIT_VERSION;
  */
 #define NOT_BARE 	(1<<2)
 
-static void handle_internal_command(int argc, const char **argv, char **envp)
+struct cmd_struct {
+	const char *cmd;
+	int (*fn)(int, const char **, const char *);
+	int option;
+};
+
+static int run_command(struct cmd_struct *p, int argc, const char **argv)
+{
+	int status;
+	struct stat st;
+	const char *prefix;
+
+	prefix = NULL;
+	if (p->option & RUN_SETUP)
+		prefix = setup_git_directory();
+	if (p->option & USE_PAGER)
+		setup_pager();
+	if (p->option & NOT_BARE) {
+		if (is_bare_repository() || is_inside_git_dir())
+			die("%s must be run in a work tree", p->cmd);
+	}
+	trace_argv_printf(argv, argc, "trace: built-in: git");
+
+	status = p->fn(argc, argv, prefix);
+	if (status)
+		return status;
+
+	/* Somebody closed stdout? */
+	if (fstat(fileno(stdout), &st))
+		return 0;
+	/* Ignore write errors for pipes and sockets.. */
+	if (S_ISFIFO(st.st_mode) || S_ISSOCK(st.st_mode))
+		return 0;
+
+	/* Check for ENOSPC and EIO errors.. */
+	if (ferror(stdout))
+		die("write failure on standard output");
+	if (fflush(stdout) || fclose(stdout))
+		die("write failure on standard output: %s", strerror(errno));
+
+	return 0;
+}
+
+static void handle_internal_command(int argc, const char **argv)
 {
 	const char *cmd = argv[0];
-	static struct cmd_struct {
-		const char *cmd;
-		int (*fn)(int, const char **, const char *);
-		int option;
-	} commands[] = {
+	static struct cmd_struct commands[] = {
 		{ "add", cmd_add, RUN_SETUP | NOT_BARE },
 		{ "annotate", cmd_annotate, RUN_SETUP | USE_PAGER },
 		{ "apply", cmd_apply },
@@ -307,25 +346,13 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
 
 	for (i = 0; i < ARRAY_SIZE(commands); i++) {
 		struct cmd_struct *p = commands+i;
-		const char *prefix;
 		if (strcmp(p->cmd, cmd))
 			continue;
-
-		prefix = NULL;
-		if (p->option & RUN_SETUP)
-			prefix = setup_git_directory();
-		if (p->option & USE_PAGER)
-			setup_pager();
-		if ((p->option & NOT_BARE) &&
-				(is_bare_repository() || is_inside_git_dir()))
-			die("%s must be run in a work tree", cmd);
-		trace_argv_printf(argv, argc, "trace: built-in: git");
-
-		exit(p->fn(argc, argv, prefix));
+		exit(run_command(p, argc, argv));
 	}
 }
 
-int main(int argc, const char **argv, char **envp)
+int main(int argc, const char **argv)
 {
 	const char *cmd = argv[0] ? argv[0] : "git-help";
 	char *slash = strrchr(cmd, '/');
@@ -358,7 +385,7 @@ int main(int argc, const char **argv, char **envp)
 	if (!prefixcmp(cmd, "git-")) {
 		cmd += 4;
 		argv[0] = cmd;
-		handle_internal_command(argc, argv, envp);
+		handle_internal_command(argc, argv);
 		die("cannot handle %s internally", cmd);
 	}
 
@@ -390,7 +417,7 @@ int main(int argc, const char **argv, char **envp)
 
 	while (1) {
 		/* See if it's an internal command */
-		handle_internal_command(argc, argv, envp);
+		handle_internal_command(argc, argv);
 
 		/* .. then try the external ones */
 		execv_git_cmd(argv);