revert(3p/git): Revert merge of git upstream at v2.26.2

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232, reversing
changes made to f2b211131f.

third_party/git/builtin/submodule--helper.c

@@ -19,8 +19,6 @@
 #include "diffcore.h"
 #include "diff.h"
 #include "object-store.h"
-#include "dir.h"
-#include "advice.h"
 
 #define OPT_QUIET (1 << 0)
 #define OPT_CACHED (1 << 1)
@@ -426,7 +424,7 @@ static int module_list(int argc, const char **argv, const char *prefix)
 		const struct cache_entry *ce = list.entries[i];
 
 		if (ce_stage(ce))
-			printf("%06o %s U\t", ce->ce_mode, oid_to_hex(&null_oid));
+			printf("%06o %s U\t", ce->ce_mode, sha1_to_hex(null_sha1));
 		else
 			printf("%06o %s %d\t", ce->ce_mode,
 			       oid_to_hex(&ce->oid), ce_stage(ce));
@@ -782,8 +780,6 @@ static void status_submodule(const char *path, const struct object_id *ce_oid,
 	struct argv_array diff_files_args = ARGV_ARRAY_INIT;
 	struct rev_info rev;
 	int diff_files_result;
-	struct strbuf buf = STRBUF_INIT;
-	const char *git_dir;
 
 	if (!submodule_from_path(the_repository, &null_oid, path))
 		die(_("no submodule mapping found in .gitmodules for path '%s'"),
@@ -796,26 +792,17 @@ static void status_submodule(const char *path, const struct object_id *ce_oid,
 		goto cleanup;
 	}
 
-	strbuf_addf(&buf, "%s/.git", path);
-	git_dir = read_gitfile(buf.buf);
-	if (!git_dir)
-		git_dir = buf.buf;
-
-	if (!is_submodule_active(the_repository, path) ||
-	    !is_git_directory(git_dir)) {
+	if (!is_submodule_active(the_repository, path)) {
 		print_status(flags, '-', path, ce_oid, displaypath);
-		strbuf_release(&buf);
 		goto cleanup;
 	}
-	strbuf_release(&buf);
 
 	argv_array_pushl(&diff_files_args, "diff-files",
 			 "--ignore-submodules=dirty", "--quiet", "--",
 			 path, NULL);
 
 	git_config(git_diff_basic_config, NULL);
-
-	repo_init_revisions(the_repository, &rev, NULL);
+	repo_init_revisions(the_repository, &rev, prefix);
 	rev.abbrev = 0;
 	diff_files_args.argc = setup_revisions(diff_files_args.argc,
 					       diff_files_args.argv,
@@ -1235,7 +1222,7 @@ static int module_deinit(int argc, const char **argv, const char *prefix)
 
 static int clone_submodule(const char *path, const char *gitdir, const char *url,
 			   const char *depth, struct string_list *reference, int dissociate,
-			   int quiet, int progress, int single_branch)
+			   int quiet, int progress)
 {
 	struct child_process cp = CHILD_PROCESS_INIT;
 
@@ -1257,10 +1244,6 @@ static int clone_submodule(const char *path, const char *gitdir, const char *url
 		argv_array_push(&cp.args, "--dissociate");
 	if (gitdir && *gitdir)
 		argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
-	if (single_branch >= 0)
-		argv_array_push(&cp.args, single_branch ?
-					  "--single-branch" :
-					  "--no-single-branch");
 
 	argv_array_push(&cp.args, "--");
 	argv_array_push(&cp.args, url);
@@ -1285,13 +1268,6 @@ struct submodule_alternate_setup {
 #define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
 	SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
 
-static const char alternate_error_advice[] = N_(
-"An alternate computed from a superproject's alternate is invalid.\n"
-"To allow Git to clone without an alternate in such a case, set\n"
-"submodule.alternateErrorStrategy to 'info' or, equivalently, clone with\n"
-"'--reference-if-able' instead of '--reference'."
-);
-
 static int add_possible_reference_from_superproject(
 		struct object_directory *odb, void *sas_cb)
 {
@@ -1323,8 +1299,6 @@ static int add_possible_reference_from_superproject(
 		} else {
 			switch (sas->error_mode) {
 			case SUBMODULE_ALTERNATE_ERROR_DIE:
-				if (advice_submodule_alternate_error_strategy_die)
-					advise(_(alternate_error_advice));
 				die(_("submodule '%s' cannot add alternate: %s"),
 				    sas->submodule_name, err.buf);
 			case SUBMODULE_ALTERNATE_ERROR_INFO:
@@ -1385,9 +1359,8 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 	char *p, *path = NULL, *sm_gitdir;
 	struct strbuf sb = STRBUF_INIT;
 	struct string_list reference = STRING_LIST_INIT_NODUP;
-	int dissociate = 0, require_init = 0;
+	int dissociate = 0;
 	char *sm_alternate = NULL, *error_strategy = NULL;
-	int single_branch = -1;
 
 	struct option module_clone_options[] = {
 		OPT_STRING(0, "prefix", &prefix,
@@ -1413,17 +1386,12 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 		OPT__QUIET(&quiet, "Suppress output for cloning a submodule"),
 		OPT_BOOL(0, "progress", &progress,
 			   N_("force cloning progress")),
-		OPT_BOOL(0, "require-init", &require_init,
-			   N_("disallow cloning into non-empty directory")),
-		OPT_BOOL(0, "single-branch", &single_branch,
-			 N_("clone only one branch, HEAD or --branch")),
 		OPT_END()
 	};
 
 	const char *const git_submodule_helper_usage[] = {
 		N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
 		   "[--reference <repository>] [--name <name>] [--depth <depth>] "
-		   "[--single-branch] "
 		   "--url <url> --path <path>"),
 		NULL
 	};
@@ -1445,10 +1413,6 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 	} else
 		path = xstrdup(path);
 
-	if (validate_submodule_git_dir(sm_gitdir, name) < 0)
-		die(_("refusing to create/use '%s' in another submodule's "
-			"git dir"), sm_gitdir);
-
 	if (!file_exists(sm_gitdir)) {
 		if (safe_create_leading_directories_const(sm_gitdir) < 0)
 			die(_("could not create directory '%s'"), sm_gitdir);
@@ -1456,12 +1420,10 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 		prepare_possible_alternates(name, &reference);
 
 		if (clone_submodule(path, sm_gitdir, url, depth, &reference, dissociate,
-				    quiet, progress, single_branch))
+				    quiet, progress))
 			die(_("clone of '%s' into submodule path '%s' failed"),
 			    url, path);
 	} else {
-		if (require_init && !access(path, X_OK) && !is_empty_dir(path))
-			die(_("directory not empty: '%s'"), path);
 		if (safe_create_leading_directories_const(path) < 0)
 			die(_("could not create directory '%s'"), path);
 		strbuf_addf(&sb, "%s/index", sm_gitdir);
@@ -1516,8 +1478,6 @@ static void determine_submodule_update_strategy(struct repository *r,
 			die(_("Invalid update mode '%s' configured for submodule path '%s'"),
 				val, path);
 	} else if (sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
-		if (sub->update_strategy.type == SM_UPDATE_COMMAND)
-			BUG("how did we read update = !command from .gitmodules?");
 		out->type = sub->update_strategy.type;
 		out->command = sub->update_strategy.command;
 	} else
@@ -1576,11 +1536,9 @@ struct submodule_update_clone {
 	int recommend_shallow;
 	struct string_list references;
 	int dissociate;
-	unsigned require_init;
 	const char *depth;
 	const char *recursive_prefix;
 	const char *prefix;
-	int single_branch;
 
 	/* to be consumed by git-submodule.sh */
 	struct update_clone_data *update_clone;
@@ -1595,14 +1553,10 @@ struct submodule_update_clone {
 
 	int max_jobs;
 };
-#define SUBMODULE_UPDATE_CLONE_INIT { \
-	.list = MODULE_LIST_INIT, \
-	.update = SUBMODULE_UPDATE_STRATEGY_INIT, \
-	.recommend_shallow = -1, \
-	.references = STRING_LIST_INIT_DUP, \
-	.single_branch = -1, \
-	.max_jobs = 1, \
-}
+#define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
+	SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, \
+	NULL, NULL, NULL, \
+	NULL, 0, 0, 0, NULL, 0, 0, 1}
 
 
 static void next_submodule_warn_missing(struct submodule_update_clone *suc,
@@ -1727,8 +1681,6 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 		argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
 	if (suc->recommend_shallow && sub->recommend_shallow == 1)
 		argv_array_push(&child->args, "--depth=1");
-	if (suc->require_init)
-		argv_array_push(&child->args, "--require-init");
 	argv_array_pushl(&child->args, "--path", sub->path, NULL);
 	argv_array_pushl(&child->args, "--name", sub->name, NULL);
 	argv_array_pushl(&child->args, "--url", url, NULL);
@@ -1741,10 +1693,6 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
 		argv_array_push(&child->args, "--dissociate");
 	if (suc->depth)
 		argv_array_push(&child->args, suc->depth);
-	if (suc->single_branch >= 0)
-		argv_array_push(&child->args, suc->single_branch ?
-					      "--single-branch" :
-					      "--no-single-branch");
 
 cleanup:
 	strbuf_reset(&displaypath_sb);
@@ -1922,15 +1870,11 @@ static int update_clone(int argc, const char **argv, const char *prefix)
 		OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
 		OPT_BOOL(0, "progress", &suc.progress,
 			    N_("force cloning progress")),
-		OPT_BOOL(0, "require-init", &suc.require_init,
-			   N_("disallow cloning into non-empty directory")),
-		OPT_BOOL(0, "single-branch", &suc.single_branch,
-			 N_("clone only one branch, HEAD or --branch")),
 		OPT_END()
 	};
 
 	const char *const git_submodule_helper_usage[] = {
-		N_("git submodule--helper update-clone [--prefix=<path>] [<path>...]"),
+		N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
 		NULL
 	};
 	suc.prefix = prefix;