1 files changed, 49 insertions, 7 deletions

diff --git a/git.c b/git.c
index 0f1937fd0..dce529fcb 100644
--- a/git.c
+++ b/git.c
@@ -35,8 +35,7 @@ static void save_env_before_alias(void)
 	orig_cwd = xgetcwd();
 	for (i = 0; i < ARRAY_SIZE(env_names); i++) {
 		orig_env[i] = getenv(env_names[i]);
-		if (orig_env[i])
-			orig_env[i] = xstrdup(orig_env[i]);
+		orig_env[i] = xstrdup_or_null(orig_env[i]);
 	}
 }
 
@@ -164,6 +163,20 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
 			setenv(GIT_WORK_TREE_ENVIRONMENT, cmd, 1);
 			if (envchanged)
 				*envchanged = 1;
+		} else if (!strcmp(cmd, "--super-prefix")) {
+			if (*argc < 2) {
+				fprintf(stderr, "No prefix given for --super-prefix.\n" );
+				usage(git_usage_string);
+			}
+			setenv(GIT_SUPER_PREFIX_ENVIRONMENT, (*argv)[1], 1);
+			if (envchanged)
+				*envchanged = 1;
+			(*argv)++;
+			(*argc)--;
+		} else if (skip_prefix(cmd, "--super-prefix=", &cmd)) {
+			setenv(GIT_SUPER_PREFIX_ENVIRONMENT, cmd, 1);
+			if (envchanged)
+				*envchanged = 1;
 		} else if (!strcmp(cmd, "--bare")) {
 			char *cwd = xgetcwd();
 			is_bare_repository_cfg = 1;
@@ -310,6 +323,7 @@ static int handle_alias(int *argcp, const char ***argv)
  * RUN_SETUP for reading from the configuration file.
  */
 #define NEED_WORK_TREE		(1<<3)
+#define SUPPORT_SUPER_PREFIX	(1<<4)
 
 struct cmd_struct {
 	const char *cmd;
@@ -344,6 +358,13 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 	}
 	commit_pager_choice();
 
+	if (!help && get_super_prefix()) {
+		if (!(p->option & SUPPORT_SUPER_PREFIX))
+			die("%s doesn't support --super-prefix", p->cmd);
+		if (prefix)
+			die("can't use --super-prefix from a subdirectory");
+	}
+
 	if (!help && p->option & NEED_WORK_TREE)
 		setup_work_tree();
 
@@ -375,7 +396,7 @@ static struct cmd_struct commands[] = {
 	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 	{ "annotate", cmd_annotate, RUN_SETUP },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
-	{ "archive", cmd_archive },
+	{ "archive", cmd_archive, RUN_SETUP_GENTLY },
 	{ "bisect--helper", cmd_bisect__helper, RUN_SETUP },
 	{ "blame", cmd_blame, RUN_SETUP },
 	{ "branch", cmd_branch, RUN_SETUP },
@@ -421,10 +442,10 @@ static struct cmd_struct commands[] = {
 	{ "init-db", cmd_init_db },
 	{ "interpret-trailers", cmd_interpret_trailers, RUN_SETUP_GENTLY },
 	{ "log", cmd_log, RUN_SETUP },
-	{ "ls-files", cmd_ls_files, RUN_SETUP },
+	{ "ls-files", cmd_ls_files, RUN_SETUP | SUPPORT_SUPER_PREFIX },
 	{ "ls-remote", cmd_ls_remote, RUN_SETUP_GENTLY },
 	{ "ls-tree", cmd_ls_tree, RUN_SETUP },
-	{ "mailinfo", cmd_mailinfo },
+	{ "mailinfo", cmd_mailinfo, RUN_SETUP_GENTLY },
 	{ "mailsplit", cmd_mailsplit },
 	{ "merge", cmd_merge, RUN_SETUP | NEED_WORK_TREE },
 	{ "merge-base", cmd_merge_base, RUN_SETUP },
@@ -444,7 +465,7 @@ static struct cmd_struct commands[] = {
 	{ "pack-objects", cmd_pack_objects, RUN_SETUP },
 	{ "pack-redundant", cmd_pack_redundant, RUN_SETUP },
 	{ "pack-refs", cmd_pack_refs, RUN_SETUP },
-	{ "patch-id", cmd_patch_id },
+	{ "patch-id", cmd_patch_id, RUN_SETUP_GENTLY },
 	{ "pickaxe", cmd_blame, RUN_SETUP },
 	{ "prune", cmd_prune, RUN_SETUP },
 	{ "prune-packed", cmd_prune_packed, RUN_SETUP },
@@ -522,21 +543,34 @@ static void strip_extension(const char **argv)
 
 static void handle_builtin(int argc, const char **argv)
 {
+	struct argv_array args = ARGV_ARRAY_INIT;
 	const char *cmd;
 	struct cmd_struct *builtin;
 
 	strip_extension(argv);
 	cmd = argv[0];
 
-	/* Turn "git cmd --help" into "git help cmd" */
+	/* Turn "git cmd --help" into "git help --exclude-guides cmd" */
 	if (argc > 1 && !strcmp(argv[1], "--help")) {
+		int i;
+
 		argv[1] = argv[0];
 		argv[0] = cmd = "help";
+
+		for (i = 0; i < argc; i++) {
+			argv_array_push(&args, argv[i]);
+			if (!i)
+				argv_array_push(&args, "--exclude-guides");
+		}
+
+		argc++;
+		argv = args.argv;
 	}
 
 	builtin = get_builtin(cmd);
 	if (builtin)
 		exit(run_builtin(builtin, argc, argv));
+	argv_array_clear(&args);
 }
 
 static void execv_dashed_external(const char **argv)
@@ -545,6 +579,9 @@ static void execv_dashed_external(const char **argv)
 	const char *tmp;
 	int status;
 
+	if (get_super_prefix())
+		die("%s doesn't support --super-prefix", argv[0]);
+
 	if (use_pager == -1)
 		use_pager = check_pager_config(argv[0]);
 	commit_pager_choice();
@@ -617,6 +654,11 @@ int cmd_main(int argc, const char **argv)
 	cmd = argv[0];
 	if (!cmd)
 		cmd = "git-help";
+	else {
+		const char *slash = find_last_dir_sep(cmd);
+		if (slash)
+			cmd = slash + 1;
+	}
 
 	trace_command_performance(argv);