ls-files: optionally recurse into submodules

Allow ls-files to recognize submodules in order to retrieve a list of
files from a repository's submodules.  This is done by forking off a
process to recursively call ls-files on all submodules. Use top-level
--super-prefix option to pass a path to the submodule which it can
use to prepend to output or pathspec matching logic.

Signed-off-by: Brandon Williams <bmwill@google.com>
Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-ls-files.txt

@@ -18,7 +18,8 @@ SYNOPSIS
 		[--exclude-per-directory=<file>]
 		[--exclude-standard]
 		[--error-unmatch] [--with-tree=<tree-ish>]
-		[--full-name] [--abbrev] [--] [<file>...]
+		[--full-name] [--recurse-submodules]
+		[--abbrev] [--] [<file>...]
 
 DESCRIPTION
 -----------
@@ -137,6 +138,11 @@ a space) at the start of each line:
 	option forces paths to be output relative to the project
 	top directory.
 
+--recurse-submodules::
+	Recursively calls ls-files on each submodule in the repository.
+	Currently there is only support for the --cached mode without a
+	pathspec.
+
 --abbrev[=<n>]::
 	Instead of showing the full 40-byte hexadecimal object
 	lines, show only a partial prefix.

builtin/ls-files.c

@@ -14,6 +14,7 @@
 #include "resolve-undo.h"
 #include "string-list.h"
 #include "pathspec.h"
+#include "run-command.h"
 
 static int abbrev;
 static int show_deleted;
@@ -28,8 +29,10 @@ static int show_valid_bit;
 static int line_terminator = '\n';
 static int debug_mode;
 static int show_eol;
+static int recurse_submodules;
 
 static const char *prefix;
+static const char *super_prefix;
 static int max_prefix_len;
 static int prefix_len;
 static struct pathspec pathspec;
@@ -67,12 +70,25 @@ static void write_eolinfo(const struct cache_entry *ce, const char *path)
 
 static void write_name(const char *name)
 {
+	/*
+	 * Prepend the super_prefix to name to construct the full_name to be
+	 * written.
+	 */
+	struct strbuf full_name = STRBUF_INIT;
+	if (super_prefix) {
+		strbuf_addstr(&full_name, super_prefix);
+		strbuf_addstr(&full_name, name);
+		name = full_name.buf;
+	}
+
 	/*
 	 * With "--full-name", prefix_len=0; this caller needs to pass
 	 * an empty string in that case (a NULL is good for "").
 	 */
 	write_name_quoted_relative(name, prefix_len ? prefix : NULL,
 				   stdout, line_terminator);
+
+	strbuf_release(&full_name);
 }
 
 static void show_dir_entry(const char *tag, struct dir_entry *ent)
@@ -152,18 +168,44 @@ static void show_killed_files(struct dir_struct *dir)
 	}
 }
 
+/**
+ * Recursively call ls-files on a submodule
+ */
+static void show_gitlink(const struct cache_entry *ce)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	int status;
+
+	argv_array_pushf(&cp.args, "--super-prefix=%s%s/",
+			 super_prefix ? super_prefix : "",
+			 ce->name);
+	argv_array_push(&cp.args, "ls-files");
+	argv_array_push(&cp.args, "--recurse-submodules");
+
+	cp.git_cmd = 1;
+	cp.dir = ce->name;
+	status = run_command(&cp);
+	if (status)
+		exit(status);
+}
+
 static void show_ce_entry(const char *tag, const struct cache_entry *ce)
 {
+	struct strbuf name = STRBUF_INIT;
 	int len = max_prefix_len;
+	if (super_prefix)
+		strbuf_addstr(&name, super_prefix);
+	strbuf_addstr(&name, ce->name);
 
 	if (len >= ce_namelen(ce))
 		die("git ls-files: internal error - cache entry not superset of prefix");
 
-	if (!match_pathspec(&pathspec, ce->name, ce_namelen(ce),
+	if (recurse_submodules && S_ISGITLINK(ce->ce_mode)) {
+		show_gitlink(ce);
+	} else if (match_pathspec(&pathspec, name.buf, name.len,
 				  len, ps_matched,
-			    S_ISDIR(ce->ce_mode) || S_ISGITLINK(ce->ce_mode)))
-		return;
-
+				  S_ISDIR(ce->ce_mode) ||
+				  S_ISGITLINK(ce->ce_mode))) {
 		if (tag && *tag && show_valid_bit &&
 		    (ce->ce_flags & CE_VALID)) {
 			static char alttag[4];
@@ -203,6 +245,9 @@ static void show_ce_entry(const char *tag, const struct cache_entry *ce)
 		}
 	}
 
+	strbuf_release(&name);
+}
+
 static void show_ru_info(void)
 {
 	struct string_list_item *item;
@@ -468,6 +513,8 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix)
 		{ OPTION_SET_INT, 0, "full-name", &prefix_len, NULL,
 			N_("make the output relative to the project top directory"),
 			PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL },
+		OPT_BOOL(0, "recurse-submodules", &recurse_submodules,
+			N_("recurse through submodules")),
 		OPT_BOOL(0, "error-unmatch", &error_unmatch,
 			N_("if any <file> is not in the index, treat this as an error")),
 		OPT_STRING(0, "with-tree", &with_tree, N_("tree-ish"),
@@ -484,6 +531,7 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix)
 	prefix = cmd_prefix;
 	if (prefix)
 		prefix_len = strlen(prefix);
+	super_prefix = get_super_prefix();
 	git_config(git_default_config, NULL);
 
 	if (read_cache() < 0)
@@ -519,6 +567,20 @@ int cmd_ls_files(int argc, const char **argv, const char *cmd_prefix)
 	if (require_work_tree && !is_inside_work_tree())
 		setup_work_tree();
 
+	if (recurse_submodules &&
+	    (show_stage || show_deleted || show_others || show_unmerged ||
+	     show_killed || show_modified || show_resolve_undo ||
+	     show_valid_bit || show_tag || show_eol || with_tree ||
+	     (line_terminator == '\0')))
+		die("ls-files --recurse-submodules unsupported mode");
+
+	if (recurse_submodules && error_unmatch)
+		die("ls-files --recurse-submodules does not support "
+		    "--error-unmatch");
+
+	if (recurse_submodules && argc)
+		die("ls-files --recurse-submodules does not support pathspec");
+
 	parse_pathspec(&pathspec, 0,
 		       PATHSPEC_PREFER_CWD |
 		       PATHSPEC_STRIP_SUBMODULE_SLASH_CHEAP,

git.c

@@ -443,7 +443,7 @@ 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 },

t/t3007-ls-files-recurse-submodules.sh

@@ -0,0 +1,100 @@
+#!/bin/sh
+
+test_description='Test ls-files recurse-submodules feature
+
+This test verifies the recurse-submodules feature correctly lists files from
+submodules.
+'
+
+. ./test-lib.sh
+
+test_expect_success 'setup directory structure and submodules' '
+	echo a >a &&
+	mkdir b &&
+	echo b >b/b &&
+	git add a b &&
+	git commit -m "add a and b" &&
+	git init submodule &&
+	echo c >submodule/c &&
+	git -C submodule add c &&
+	git -C submodule commit -m "add c" &&
+	git submodule add ./submodule &&
+	git commit -m "added submodule"
+'
+
+test_expect_success 'ls-files correctly outputs files in submodule' '
+	cat >expect <<-\EOF &&
+	.gitmodules
+	a
+	b/b
+	submodule/c
+	EOF
+
+	git ls-files --recurse-submodules >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'ls-files does not output files not added to a repo' '
+	cat >expect <<-\EOF &&
+	.gitmodules
+	a
+	b/b
+	submodule/c
+	EOF
+
+	echo a >not_added &&
+	echo b >b/not_added &&
+	echo c >submodule/not_added &&
+	git ls-files --recurse-submodules >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'ls-files recurses more than 1 level' '
+	cat >expect <<-\EOF &&
+	.gitmodules
+	a
+	b/b
+	submodule/.gitmodules
+	submodule/c
+	submodule/subsub/d
+	EOF
+
+	git init submodule/subsub &&
+	echo d >submodule/subsub/d &&
+	git -C submodule/subsub add d &&
+	git -C submodule/subsub commit -m "add d" &&
+	git -C submodule submodule add ./subsub &&
+	git -C submodule commit -m "added subsub" &&
+	git ls-files --recurse-submodules >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--recurse-submodules does not support using path arguments' '
+	test_must_fail git ls-files --recurse-submodules b 2>actual &&
+	test_i18ngrep "does not support pathspec" actual
+'
+
+test_expect_success '--recurse-submodules does not support --error-unmatch' '
+	test_must_fail git ls-files --recurse-submodules --error-unmatch 2>actual &&
+	test_i18ngrep "does not support --error-unmatch" actual
+'
+
+test_incompatible_with_recurse_submodules () {
+	test_expect_success "--recurse-submodules and $1 are incompatible" "
+		test_must_fail git ls-files --recurse-submodules $1 2>actual &&
+		test_i18ngrep 'unsupported mode' actual
+	"
+}
+
+test_incompatible_with_recurse_submodules -z
+test_incompatible_with_recurse_submodules -v
+test_incompatible_with_recurse_submodules -t
+test_incompatible_with_recurse_submodules --deleted
+test_incompatible_with_recurse_submodules --modified
+test_incompatible_with_recurse_submodules --others
+test_incompatible_with_recurse_submodules --stage
+test_incompatible_with_recurse_submodules --killed
+test_incompatible_with_recurse_submodules --unmerged
+test_incompatible_with_recurse_submodules --eol
+
+test_done