builtin/checkout-index: stop using the_repository

Remove the_repository global variable in favor of the repository
argument that gets passed in "builtin/checkout-index.c".

When `-h` is passed to the command outside a Git repository, the
`run_builtin()` will call the `cmd_checkout_index()` function with `repo`
set to NULL and then early in the function, `show_usage_with_options_if_asked()`
call will give the options help and exit.

Pass an instance of "struct index_state" available in the calling
context to both `checkout_all()` and `checkout_file()` to remove their
dependency on the global `the_repository` variable.

Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Usman Akinyemi <usmanakinyemi202@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/checkout-index.c

@@ -5,7 +5,6 @@
  *
  */
 
-#define USE_THE_REPOSITORY_VARIABLE
 #define DISABLE_SIGN_COMPARE_WARNINGS
 
 #include "builtin.h"
@@ -68,10 +67,10 @@ static void write_tempfile_record(const char *name, const char *prefix)
 	}
 }
 
-static int checkout_file(const char *name, const char *prefix)
+static int checkout_file(struct index_state *index, const char *name, const char *prefix)
 {
 	int namelen = strlen(name);
-	int pos = index_name_pos(the_repository->index, name, namelen);
+	int pos = index_name_pos(index, name, namelen);
 	int has_same_name = 0;
 	int is_file = 0;
 	int is_skipped = 1;
@@ -81,8 +80,8 @@ static int checkout_file(const char *name, const char *prefix)
 	if (pos < 0)
 		pos = -pos - 1;
 
-	while (pos <the_repository->index->cache_nr) {
+	while (pos < index->cache_nr) {
-		struct cache_entry *ce =the_repository->index->cache[pos];
+		struct cache_entry *ce = index->cache[pos];
 		if (ce_namelen(ce) != namelen ||
 		    memcmp(ce->name, name, namelen))
 			break;
@@ -137,13 +136,13 @@ static int checkout_file(const char *name, const char *prefix)
 	return -1;
 }
 
-static int checkout_all(const char *prefix, int prefix_length)
+static int checkout_all(struct index_state *index, const char *prefix, int prefix_length)
 {
 	int i, errs = 0;
 	struct cache_entry *last_ce = NULL;
 
-	for (i = 0; i < the_repository->index->cache_nr ; i++) {
+	for (i = 0; i < index->cache_nr ; i++) {
-		struct cache_entry *ce = the_repository->index->cache[i];
+		struct cache_entry *ce = index->cache[i];
 
 		if (S_ISSPARSEDIR(ce->ce_mode)) {
 			if (!ce_skip_worktree(ce))
@@ -156,8 +155,8 @@ static int checkout_all(const char *prefix, int prefix_length)
 			 * first entry inside the expanded sparse directory).
 			 */
 			if (ignore_skip_worktree) {
-				ensure_full_index(the_repository->index);
+				ensure_full_index(index);
-				ce = the_repository->index->cache[i];
+				ce = index->cache[i];
 			}
 		}
 
@@ -213,7 +212,7 @@ static int option_parse_stage(const struct option *opt,
 int cmd_checkout_index(int argc,
 		       const char **argv,
 		       const char *prefix,
-		       struct repository *repo UNUSED)
+		       struct repository *repo)
 {
 	int i;
 	struct lock_file lock_file = LOCK_INIT;
@@ -253,19 +252,19 @@ int cmd_checkout_index(int argc,
 	show_usage_with_options_if_asked(argc, argv,
 					 builtin_checkout_index_usage,
 					 builtin_checkout_index_options);
-	git_config(git_default_config, NULL);
+	repo_config(repo, git_default_config, NULL);
 	prefix_length = prefix ? strlen(prefix) : 0;
 
-	prepare_repo_settings(the_repository);
+	prepare_repo_settings(repo);
-	the_repository->settings.command_requires_full_index = 0;
+	repo->settings.command_requires_full_index = 0;
 
-	if (repo_read_index(the_repository) < 0) {
+	if (repo_read_index(repo) < 0) {
 		die("invalid cache");
 	}
 
 	argc = parse_options(argc, argv, prefix, builtin_checkout_index_options,
 			builtin_checkout_index_usage, 0);
-	state.istate = the_repository->index;
+	state.istate = repo->index;
 	state.force = force;
 	state.quiet = quiet;
 	state.not_new = not_new;
@@ -285,8 +284,8 @@ int cmd_checkout_index(int argc,
 	 */
 	if (index_opt && !state.base_dir_len && !to_tempfile) {
 		state.refresh_cache = 1;
-		state.istate = the_repository->index;
+		state.istate = repo->index;
-		repo_hold_locked_index(the_repository, &lock_file,
+		repo_hold_locked_index(repo, &lock_file,
 				       LOCK_DIE_ON_ERROR);
 	}
 
@@ -304,7 +303,7 @@ int cmd_checkout_index(int argc,
 		if (read_from_stdin)
 			die("git checkout-index: don't mix '--stdin' and explicit filenames");
 		p = prefix_path(prefix, prefix_length, arg);
-		err |= checkout_file(p, prefix);
+		err |= checkout_file(repo->index, p, prefix);
 		free(p);
 	}
 
@@ -326,7 +325,7 @@ int cmd_checkout_index(int argc,
 				strbuf_swap(&buf, &unquoted);
 			}
 			p = prefix_path(prefix, prefix_length, buf.buf);
-			err |= checkout_file(p, prefix);
+			err |= checkout_file(repo->index, p, prefix);
 			free(p);
 		}
 		strbuf_release(&unquoted);
@@ -334,7 +333,7 @@ int cmd_checkout_index(int argc,
 	}
 
 	if (all)
-		err |= checkout_all(prefix, prefix_length);
+		err |= checkout_all(repo->index, prefix, prefix_length);
 
 	if (pc_workers > 1)
 		err |= run_parallel_checkout(&state, pc_workers, pc_threshold,
@@ -344,7 +343,7 @@ int cmd_checkout_index(int argc,
 		return 1;
 
 	if (is_lock_file_locked(&lock_file) &&
-	    write_locked_index(the_repository->index, &lock_file, COMMIT_LOCK))
+	    write_locked_index(repo->index, &lock_file, COMMIT_LOCK))
 		die("Unable to write new index file");
 	return 0;
 }

t/t2006-checkout-index-basic.sh

@@ -21,6 +21,13 @@ test_expect_success 'checkout-index -h in broken repository' '
 	test_grep "[Uu]sage" broken/usage
 '
 
+test_expect_success 'checkout-index does not crash with -h' '
+	test_expect_code 129 git checkout-index -h >usage &&
+	test_grep "[Uu]sage: git checkout-index " usage &&
+	test_expect_code 129 nongit git checkout-index -h >usage &&
+	test_grep "[Uu]sage: git checkout-index " usage
+'
+
 test_expect_success 'checkout-index reports errors (cmdline)' '
 	test_must_fail git checkout-index -- does-not-exist 2>stderr &&
 	test_grep not.in.the.cache stderr