1 files changed, 342 insertions, 28 deletions

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 5295b727d4..3bd6883eff 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -118,6 +118,55 @@ static int module_name(int argc, const char **argv, const char *prefix)
 
 	return 0;
 }
+
+/*
+ * Rules to sanitize configuration variables that are Ok to be passed into
+ * submodule operations from the parent project using "-c". Should only
+ * include keys which are both (a) safe and (b) necessary for proper
+ * operation.
+ */
+static int submodule_config_ok(const char *var)
+{
+	if (starts_with(var, "credential."))
+		return 1;
+	return 0;
+}
+
+static int sanitize_submodule_config(const char *var, const char *value, void *data)
+{
+	struct strbuf *out = data;
+
+	if (submodule_config_ok(var)) {
+		if (out->len)
+			strbuf_addch(out, ' ');
+
+		if (value)
+			sq_quotef(out, "%s=%s", var, value);
+		else
+			sq_quote_buf(out, var);
+	}
+
+	return 0;
+}
+
+static void prepare_submodule_repo_env(struct argv_array *out)
+{
+	const char * const *var;
+
+	for (var = local_repo_env; *var; var++) {
+		if (!strcmp(*var, CONFIG_DATA_ENVIRONMENT)) {
+			struct strbuf sanitized_config = STRBUF_INIT;
+			git_config_from_parameters(sanitize_submodule_config,
+						   &sanitized_config);
+			argv_array_pushf(out, "%s=%s", *var, sanitized_config.buf);
+			strbuf_release(&sanitized_config);
+		} else {
+			argv_array_push(out, *var);
+		}
+	}
+
+}
+
 static int clone_submodule(const char *path, const char *gitdir, const char *url,
 			   const char *depth, const char *reference, int quiet)
 {
@@ -139,7 +188,7 @@ static int clone_submodule(const char *path, const char *gitdir, const char *url
 	argv_array_push(&cp.args, path);
 
 	cp.git_cmd = 1;
-	cp.env = local_repo_env;
+	prepare_submodule_repo_env(&cp.env_array);
 	cp.no_stdin = 1;
 
 	return run_command(&cp);
@@ -147,11 +196,11 @@ static int clone_submodule(const char *path, const char *gitdir, const char *url
 
 static int module_clone(int argc, const char **argv, const char *prefix)
 {
-	const char *path = NULL, *name = NULL, *url = NULL;
+	const char *name = NULL, *url = NULL;
 	const char *reference = NULL, *depth = NULL;
 	int quiet = 0;
 	FILE *submodule_dot_git;
-	char *sm_gitdir, *cwd, *p;
+	char *p, *path = NULL, *sm_gitdir;
 	struct strbuf rel_path = STRBUF_INIT;
 	struct strbuf sb = STRBUF_INIT;
 
@@ -180,16 +229,27 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 
 	const char *const git_submodule_helper_usage[] = {
 		N_("git submodule--helper clone [--prefix=<path>] [--quiet] "
-		   "[--reference <repository>] [--name <name>] [--url <url>]"
-		   "[--depth <depth>] [--] [<path>...]"),
+		   "[--reference <repository>] [--name <name>] [--depth <depth>] "
+		   "--url <url> --path <path>"),
 		NULL
 	};
 
 	argc = parse_options(argc, argv, prefix, module_clone_options,
 			     git_submodule_helper_usage, 0);
 
+	if (argc || !url || !path || !*path)
+		usage_with_options(git_submodule_helper_usage,
+				   module_clone_options);
+
 	strbuf_addf(&sb, "%s/modules/%s", get_git_dir(), name);
-	sm_gitdir = strbuf_detach(&sb, NULL);
+	sm_gitdir = xstrdup(absolute_path(sb.buf));
+	strbuf_reset(&sb);
+
+	if (!is_absolute_path(path)) {
+		strbuf_addf(&sb, "%s/%s", get_git_work_tree(), path);
+		path = strbuf_detach(&sb, NULL);
+	} else
+		path = xstrdup(path);
 
 	if (!file_exists(sm_gitdir)) {
 		if (safe_create_leading_directories_const(sm_gitdir) < 0)
@@ -206,49 +266,301 @@ static int module_clone(int argc, const char **argv, const char *prefix)
 	}
 
 	/* Write a .git file in the submodule to redirect to the superproject. */
-	if (safe_create_leading_directories_const(path) < 0)
-		die(_("could not create directory '%s'"), path);
-
-	if (path && *path)
-		strbuf_addf(&sb, "%s/.git", path);
-	else
-		strbuf_addstr(&sb, ".git");
-
+	strbuf_addf(&sb, "%s/.git", path);
 	if (safe_create_leading_directories_const(sb.buf) < 0)
 		die(_("could not create leading directories of '%s'"), sb.buf);
 	submodule_dot_git = fopen(sb.buf, "w");
 	if (!submodule_dot_git)
 		die_errno(_("cannot open file '%s'"), sb.buf);
 
-	fprintf(submodule_dot_git, "gitdir: %s\n",
-		relative_path(sm_gitdir, path, &rel_path));
+	fprintf_or_die(submodule_dot_git, "gitdir: %s\n",
+		       relative_path(sm_gitdir, path, &rel_path));
 	if (fclose(submodule_dot_git))
 		die(_("could not close file %s"), sb.buf);
 	strbuf_reset(&sb);
 	strbuf_reset(&rel_path);
 
-	cwd = xgetcwd();
 	/* Redirect the worktree of the submodule in the superproject's config */
-	if (!is_absolute_path(sm_gitdir)) {
-		strbuf_addf(&sb, "%s/%s", cwd, sm_gitdir);
-		free(sm_gitdir);
-		sm_gitdir = strbuf_detach(&sb, NULL);
-	}
-
-	strbuf_addf(&sb, "%s/%s", cwd, path);
 	p = git_pathdup_submodule(path, "config");
 	if (!p)
 		die(_("could not get submodule directory for '%s'"), path);
 	git_config_set_in_file(p, "core.worktree",
-			       relative_path(sb.buf, sm_gitdir, &rel_path));
+			       relative_path(path, sm_gitdir, &rel_path));
 	strbuf_release(&sb);
 	strbuf_release(&rel_path);
 	free(sm_gitdir);
-	free(cwd);
+	free(path);
 	free(p);
 	return 0;
 }
 
+static int module_sanitize_config(int argc, const char **argv, const char *prefix)
+{
+	struct strbuf sanitized_config = STRBUF_INIT;
+
+	if (argc > 1)
+		usage(_("git submodule--helper sanitize-config"));
+
+	git_config_from_parameters(sanitize_submodule_config, &sanitized_config);
+	if (sanitized_config.len)
+		printf("%s\n", sanitized_config.buf);
+
+	strbuf_release(&sanitized_config);
+
+	return 0;
+}
+
+struct submodule_update_clone {
+	/* index into 'list', the list of submodules to look into for cloning */
+	int current;
+	struct module_list list;
+	unsigned warn_if_uninitialized : 1;
+
+	/* update parameter passed via commandline */
+	struct submodule_update_strategy update;
+
+	/* configuration parameters which are passed on to the children */
+	int quiet;
+	const char *reference;
+	const char *depth;
+	const char *recursive_prefix;
+	const char *prefix;
+
+	/* Machine-readable status lines to be consumed by git-submodule.sh */
+	struct string_list projectlines;
+
+	/* If we want to stop as fast as possible and return an error */
+	unsigned quickstop : 1;
+};
+#define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
+	SUBMODULE_UPDATE_STRATEGY_INIT, 0, NULL, NULL, NULL, NULL, \
+	STRING_LIST_INIT_DUP, 0}
+
+/**
+ * Determine whether 'ce' needs to be cloned. If so, prepare the 'child' to
+ * run the clone. Returns 1 if 'ce' needs to be cloned, 0 otherwise.
+ */
+static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
+					   struct child_process *child,
+					   struct submodule_update_clone *suc,
+					   struct strbuf *out)
+{
+	const struct submodule *sub = NULL;
+	struct strbuf displaypath_sb = STRBUF_INIT;
+	struct strbuf sb = STRBUF_INIT;
+	const char *displaypath = NULL;
+	char *url = NULL;
+	int needs_cloning = 0;
+
+	if (ce_stage(ce)) {
+		if (suc->recursive_prefix)
+			strbuf_addf(&sb, "%s/%s", suc->recursive_prefix, ce->name);
+		else
+			strbuf_addf(&sb, "%s", ce->name);
+		strbuf_addf(out, _("Skipping unmerged submodule %s"), sb.buf);
+		strbuf_addch(out, '\n');
+		goto cleanup;
+	}
+
+	sub = submodule_from_path(null_sha1, ce->name);
+
+	if (suc->recursive_prefix)
+		displaypath = relative_path(suc->recursive_prefix,
+					    ce->name, &displaypath_sb);
+	else
+		displaypath = ce->name;
+
+	if (suc->update.type == SM_UPDATE_NONE
+	    || (suc->update.type == SM_UPDATE_UNSPECIFIED
+		&& sub->update_strategy.type == SM_UPDATE_NONE)) {
+		strbuf_addf(out, _("Skipping submodule '%s'"), displaypath);
+		strbuf_addch(out, '\n');
+		goto cleanup;
+	}
+
+	/*
+	 * Looking up the url in .git/config.
+	 * We must not fall back to .gitmodules as we only want
+	 * to process configured submodules.
+	 */
+	strbuf_reset(&sb);
+	strbuf_addf(&sb, "submodule.%s.url", sub->name);
+	git_config_get_string(sb.buf, &url);
+	if (!url) {
+		/*
+		 * Only mention uninitialized submodules when their
+		 * path have been specified
+		 */
+		if (suc->warn_if_uninitialized) {
+			strbuf_addf(out,
+				_("Submodule path '%s' not initialized"),
+				displaypath);
+			strbuf_addch(out, '\n');
+			strbuf_addstr(out,
+				_("Maybe you want to use 'update --init'?"));
+			strbuf_addch(out, '\n');
+		}
+		goto cleanup;
+	}
+
+	strbuf_reset(&sb);
+	strbuf_addf(&sb, "%s/.git", ce->name);
+	needs_cloning = !file_exists(sb.buf);
+
+	strbuf_reset(&sb);
+	strbuf_addf(&sb, "%06o %s %d %d\t%s\n", ce->ce_mode,
+			sha1_to_hex(ce->sha1), ce_stage(ce),
+			needs_cloning, ce->name);
+	string_list_append(&suc->projectlines, sb.buf);
+
+	if (!needs_cloning)
+		goto cleanup;
+
+	child->git_cmd = 1;
+	child->no_stdin = 1;
+	child->stdout_to_stderr = 1;
+	child->err = -1;
+	argv_array_push(&child->args, "submodule--helper");
+	argv_array_push(&child->args, "clone");
+	if (suc->quiet)
+		argv_array_push(&child->args, "--quiet");
+	if (suc->prefix)
+		argv_array_pushl(&child->args, "--prefix", suc->prefix, NULL);
+	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);
+	if (suc->reference)
+		argv_array_push(&child->args, suc->reference);
+	if (suc->depth)
+		argv_array_push(&child->args, suc->depth);
+
+cleanup:
+	free(url);
+	strbuf_reset(&displaypath_sb);
+	strbuf_reset(&sb);
+
+	return needs_cloning;
+}
+
+static int update_clone_get_next_task(struct child_process *child,
+				      struct strbuf *err,
+				      void *suc_cb,
+				      void **void_task_cb)
+{
+	struct submodule_update_clone *suc = suc_cb;
+
+	for (; suc->current < suc->list.nr; suc->current++) {
+		const struct cache_entry *ce = suc->list.entries[suc->current];
+		if (prepare_to_clone_next_submodule(ce, child, suc, err)) {
+			suc->current++;
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static int update_clone_start_failure(struct strbuf *err,
+				      void *suc_cb,
+				      void *void_task_cb)
+{
+	struct submodule_update_clone *suc = suc_cb;
+	suc->quickstop = 1;
+	return 1;
+}
+
+static int update_clone_task_finished(int result,
+				      struct strbuf *err,
+				      void *suc_cb,
+				      void *void_task_cb)
+{
+	struct submodule_update_clone *suc = suc_cb;
+
+	if (!result)
+		return 0;
+
+	suc->quickstop = 1;
+	return 1;
+}
+
+static int update_clone(int argc, const char **argv, const char *prefix)
+{
+	const char *update = NULL;
+	int max_jobs = -1;
+	struct string_list_item *item;
+	struct pathspec pathspec;
+	struct submodule_update_clone suc = SUBMODULE_UPDATE_CLONE_INIT;
+
+	struct option module_update_clone_options[] = {
+		OPT_STRING(0, "prefix", &prefix,
+			   N_("path"),
+			   N_("path into the working tree")),
+		OPT_STRING(0, "recursive-prefix", &suc.recursive_prefix,
+			   N_("path"),
+			   N_("path into the working tree, across nested "
+			      "submodule boundaries")),
+		OPT_STRING(0, "update", &update,
+			   N_("string"),
+			   N_("rebase, merge, checkout or none")),
+		OPT_STRING(0, "reference", &suc.reference, N_("repo"),
+			   N_("reference repository")),
+		OPT_STRING(0, "depth", &suc.depth, "<depth>",
+			   N_("Create a shallow clone truncated to the "
+			      "specified number of revisions")),
+		OPT_INTEGER('j', "jobs", &max_jobs,
+			    N_("parallel jobs")),
+		OPT__QUIET(&suc.quiet, N_("don't print cloning progress")),
+		OPT_END()
+	};
+
+	const char *const git_submodule_helper_usage[] = {
+		N_("git submodule--helper update_clone [--prefix=<path>] [<path>...]"),
+		NULL
+	};
+	suc.prefix = prefix;
+
+	argc = parse_options(argc, argv, prefix, module_update_clone_options,
+			     git_submodule_helper_usage, 0);
+
+	if (update)
+		if (parse_submodule_update_strategy(update, &suc.update) < 0)
+			die(_("bad value for update parameter"));
+
+	if (module_list_compute(argc, argv, prefix, &pathspec, &suc.list) < 0)
+		return 1;
+
+	if (pathspec.nr)
+		suc.warn_if_uninitialized = 1;
+
+	/* Overlay the parsed .gitmodules file with .git/config */
+	gitmodules_config();
+	git_config(submodule_config, NULL);
+
+	if (max_jobs < 0)
+		max_jobs = parallel_submodules();
+
+	run_processes_parallel(max_jobs,
+			       update_clone_get_next_task,
+			       update_clone_start_failure,
+			       update_clone_task_finished,
+			       &suc);
+
+	/*
+	 * We saved the output and put it out all at once now.
+	 * That means:
+	 * - the listener does not have to interleave their (checkout)
+	 *   work with our fetching.  The writes involved in a
+	 *   checkout involve more straightforward sequential I/O.
+	 * - the listener can avoid doing any work if fetching failed.
+	 */
+	if (suc.quickstop)
+		return 1;
+
+	for_each_string_list_item(item, &suc.projectlines)
+		utf8_fprintf(stdout, "%s", item->string);
+
+	return 0;
+}
+
 struct cmd_struct {
 	const char *cmd;
 	int (*fn)(int, const char **, const char *);
@@ -258,19 +570,21 @@ static struct cmd_struct commands[] = {
 	{"list", module_list},
 	{"name", module_name},
 	{"clone", module_clone},
+	{"sanitize-config", module_sanitize_config},
+	{"update-clone", update_clone}
 };
 
 int cmd_submodule__helper(int argc, const char **argv, const char *prefix)
 {
 	int i;
 	if (argc < 2)
-		die(_("fatal: submodule--helper subcommand must be "
+		die(_("submodule--helper subcommand must be "
 		      "called with a subcommand"));
 
 	for (i = 0; i < ARRAY_SIZE(commands); i++)
 		if (!strcmp(argv[1], commands[i].cmd))
 			return commands[i].fn(argc - 1, argv + 1, prefix);
 
-	die(_("fatal: '%s' is not a valid submodule--helper "
+	die(_("'%s' is not a valid submodule--helper "
 	      "subcommand"), argv[1]);
 }