Imported Upstream version 2.19.3
[platform/upstream/git.git] / builtin / submodule--helper.c
index 7794049..382e823 100644 (file)
 #include "run-command.h"
 #include "remote.h"
 #include "refs.h"
+#include "refspec.h"
 #include "connect.h"
+#include "revision.h"
+#include "diffcore.h"
+#include "diff.h"
+#include "object-store.h"
+#include "dir.h"
+
+#define OPT_QUIET (1 << 0)
+#define OPT_CACHED (1 << 1)
+#define OPT_RECURSIVE (1 << 2)
+#define OPT_FORCE (1 << 3)
+
+typedef void (*each_submodule_fn)(const struct cache_entry *list_item,
+                                 void *cb_data);
 
 static char *get_default_remote(void)
 {
@@ -40,6 +54,21 @@ static char *get_default_remote(void)
        return ret;
 }
 
+static int print_default_remote(int argc, const char **argv, const char *prefix)
+{
+       char *remote;
+
+       if (argc != 1)
+               die(_("submodule--helper print-default-remote takes no arguments"));
+
+       remote = get_default_remote();
+       if (remote)
+               printf("%s\n", remote);
+
+       free(remote);
+       return 0;
+}
+
 static int starts_with_dot_slash(const char *str)
 {
        return str[0] == '.' && is_dir_sep(str[1]);
@@ -219,6 +248,64 @@ static int resolve_relative_url_test(int argc, const char **argv, const char *pr
        return 0;
 }
 
+/* the result should be freed by the caller. */
+static char *get_submodule_displaypath(const char *path, const char *prefix)
+{
+       const char *super_prefix = get_super_prefix();
+
+       if (prefix && super_prefix) {
+               BUG("cannot have prefix '%s' and superprefix '%s'",
+                   prefix, super_prefix);
+       } else if (prefix) {
+               struct strbuf sb = STRBUF_INIT;
+               char *displaypath = xstrdup(relative_path(path, prefix, &sb));
+               strbuf_release(&sb);
+               return displaypath;
+       } else if (super_prefix) {
+               return xstrfmt("%s%s", super_prefix, path);
+       } else {
+               return xstrdup(path);
+       }
+}
+
+static char *compute_rev_name(const char *sub_path, const char* object_id)
+{
+       struct strbuf sb = STRBUF_INIT;
+       const char ***d;
+
+       static const char *describe_bare[] = { NULL };
+
+       static const char *describe_tags[] = { "--tags", NULL };
+
+       static const char *describe_contains[] = { "--contains", NULL };
+
+       static const char *describe_all_always[] = { "--all", "--always", NULL };
+
+       static const char **describe_argv[] = { describe_bare, describe_tags,
+                                               describe_contains,
+                                               describe_all_always, NULL };
+
+       for (d = describe_argv; *d; d++) {
+               struct child_process cp = CHILD_PROCESS_INIT;
+               prepare_submodule_repo_env(&cp.env_array);
+               cp.dir = sub_path;
+               cp.git_cmd = 1;
+               cp.no_stderr = 1;
+
+               argv_array_push(&cp.args, "describe");
+               argv_array_pushv(&cp.args, *d);
+               argv_array_push(&cp.args, object_id);
+
+               if (!capture_command(&cp, &sb, 0)) {
+                       strbuf_strip_suffix(&sb, "\n");
+                       return strbuf_detach(&sb, NULL);
+               }
+       }
+
+       strbuf_release(&sb);
+       return NULL;
+}
+
 struct module_list {
        const struct cache_entry **entries;
        int alloc, nr;
@@ -245,7 +332,7 @@ static int module_list_compute(int argc, const char **argv,
        for (i = 0; i < active_nr; i++) {
                const struct cache_entry *ce = active_cache[i];
 
-               if (!match_pathspec(pathspec, ce->name, ce_namelen(ce),
+               if (!match_pathspec(&the_index, pathspec, ce->name, ce_namelen(ce),
                                    0, ps_matched, 1) ||
                    !S_ISGITLINK(ce->ce_mode))
                        continue;
@@ -290,6 +377,25 @@ static void module_list_active(struct module_list *list)
        *list = active_modules;
 }
 
+static char *get_up_path(const char *path)
+{
+       int i;
+       struct strbuf sb = STRBUF_INIT;
+
+       for (i = count_slashes(path); i; i--)
+               strbuf_addstr(&sb, "../");
+
+       /*
+        * Check if 'path' ends with slash or not
+        * for having the same output for dir/sub_dir
+        * and dir/sub_dir/
+        */
+       if (!is_dir_sep(path[strlen(path) - 1]))
+               strbuf_addstr(&sb, "../");
+
+       return strbuf_detach(&sb, NULL);
+}
+
 static int module_list(int argc, const char **argv, const char *prefix)
 {
        int i;
@@ -328,23 +434,174 @@ static int module_list(int argc, const char **argv, const char *prefix)
        return 0;
 }
 
-static void init_submodule(const char *path, const char *prefix, int quiet)
+static void for_each_listed_submodule(const struct module_list *list,
+                                     each_submodule_fn fn, void *cb_data)
+{
+       int i;
+       for (i = 0; i < list->nr; i++)
+               fn(list->entries[i], cb_data);
+}
+
+struct cb_foreach {
+       int argc;
+       const char **argv;
+       const char *prefix;
+       int quiet;
+       int recursive;
+};
+#define CB_FOREACH_INIT { 0 }
+
+static void runcommand_in_submodule_cb(const struct cache_entry *list_item,
+                                      void *cb_data)
+{
+       struct cb_foreach *info = cb_data;
+       const char *path = list_item->name;
+       const struct object_id *ce_oid = &list_item->oid;
+
+       const struct submodule *sub;
+       struct child_process cp = CHILD_PROCESS_INIT;
+       char *displaypath;
+
+       displaypath = get_submodule_displaypath(path, info->prefix);
+
+       sub = submodule_from_path(the_repository, &null_oid, path);
+
+       if (!sub)
+               die(_("No url found for submodule path '%s' in .gitmodules"),
+                       displaypath);
+
+       if (!is_submodule_populated_gently(path, NULL))
+               goto cleanup;
+
+       prepare_submodule_repo_env(&cp.env_array);
+
+       /*
+        * For the purpose of executing <command> in the submodule,
+        * separate shell is used for the purpose of running the
+        * child process.
+        */
+       cp.use_shell = 1;
+       cp.dir = path;
+
+       /*
+        * NEEDSWORK: the command currently has access to the variables $name,
+        * $sm_path, $displaypath, $sha1 and $toplevel only when the command
+        * contains a single argument. This is done for maintaining a faithful
+        * translation from shell script.
+        */
+       if (info->argc == 1) {
+               char *toplevel = xgetcwd();
+               struct strbuf sb = STRBUF_INIT;
+
+               argv_array_pushf(&cp.env_array, "name=%s", sub->name);
+               argv_array_pushf(&cp.env_array, "sm_path=%s", path);
+               argv_array_pushf(&cp.env_array, "displaypath=%s", displaypath);
+               argv_array_pushf(&cp.env_array, "sha1=%s",
+                               oid_to_hex(ce_oid));
+               argv_array_pushf(&cp.env_array, "toplevel=%s", toplevel);
+
+               /*
+                * Since the path variable was accessible from the script
+                * before porting, it is also made available after porting.
+                * The environment variable "PATH" has a very special purpose
+                * on windows. And since environment variables are
+                * case-insensitive in windows, it interferes with the
+                * existing PATH variable. Hence, to avoid that, we expose
+                * path via the args argv_array and not via env_array.
+                */
+               sq_quote_buf(&sb, path);
+               argv_array_pushf(&cp.args, "path=%s; %s",
+                                sb.buf, info->argv[0]);
+               strbuf_release(&sb);
+               free(toplevel);
+       } else {
+               argv_array_pushv(&cp.args, info->argv);
+       }
+
+       if (!info->quiet)
+               printf(_("Entering '%s'\n"), displaypath);
+
+       if (info->argv[0] && run_command(&cp))
+               die(_("run_command returned non-zero status for %s\n."),
+                       displaypath);
+
+       if (info->recursive) {
+               struct child_process cpr = CHILD_PROCESS_INIT;
+
+               cpr.git_cmd = 1;
+               cpr.dir = path;
+               prepare_submodule_repo_env(&cpr.env_array);
+
+               argv_array_pushl(&cpr.args, "--super-prefix", NULL);
+               argv_array_pushf(&cpr.args, "%s/", displaypath);
+               argv_array_pushl(&cpr.args, "submodule--helper", "foreach", "--recursive",
+                               NULL);
+
+               if (info->quiet)
+                       argv_array_push(&cpr.args, "--quiet");
+
+               argv_array_pushv(&cpr.args, info->argv);
+
+               if (run_command(&cpr))
+                       die(_("run_command returned non-zero status while "
+                               "recursing in the nested submodules of %s\n."),
+                               displaypath);
+       }
+
+cleanup:
+       free(displaypath);
+}
+
+static int module_foreach(int argc, const char **argv, const char *prefix)
+{
+       struct cb_foreach info = CB_FOREACH_INIT;
+       struct pathspec pathspec;
+       struct module_list list = MODULE_LIST_INIT;
+
+       struct option module_foreach_options[] = {
+               OPT__QUIET(&info.quiet, N_("Suppress output of entering each submodule command")),
+               OPT_BOOL(0, "recursive", &info.recursive,
+                        N_("Recurse into nested submodules")),
+               OPT_END()
+       };
+
+       const char *const git_submodule_helper_usage[] = {
+               N_("git submodule--helper foreach [--quiet] [--recursive] <command>"),
+               NULL
+       };
+
+       argc = parse_options(argc, argv, prefix, module_foreach_options,
+                            git_submodule_helper_usage, PARSE_OPT_KEEP_UNKNOWN);
+
+       if (module_list_compute(0, NULL, prefix, &pathspec, &list) < 0)
+               return 1;
+
+       info.argc = argc;
+       info.argv = argv;
+       info.prefix = prefix;
+
+       for_each_listed_submodule(&list, runcommand_in_submodule_cb, &info);
+
+       return 0;
+}
+
+struct init_cb {
+       const char *prefix;
+       unsigned int flags;
+};
+
+#define INIT_CB_INIT { NULL, 0 }
+
+static void init_submodule(const char *path, const char *prefix,
+                          unsigned int flags)
 {
        const struct submodule *sub;
        struct strbuf sb = STRBUF_INIT;
        char *upd = NULL, *url = NULL, *displaypath;
 
-       if (prefix && get_super_prefix())
-               die("BUG: cannot have prefix and superprefix");
-       else if (prefix)
-               displaypath = xstrdup(relative_path(path, prefix, &sb));
-       else if (get_super_prefix()) {
-               strbuf_addf(&sb, "%s%s", get_super_prefix(), path);
-               displaypath = strbuf_detach(&sb, NULL);
-       } else
-               displaypath = xstrdup(path);
+       displaypath = get_submodule_displaypath(path, prefix);
 
-       sub = submodule_from_path(&null_oid, path);
+       sub = submodule_from_path(the_repository, &null_oid, path);
 
        if (!sub)
                die(_("No url found for submodule path '%s' in .gitmodules"),
@@ -357,9 +614,9 @@ static void init_submodule(const char *path, const char *prefix, int quiet)
         * Set active flag for the submodule being initialized
         */
        if (!is_submodule_active(the_repository, path)) {
-               strbuf_reset(&sb);
                strbuf_addf(&sb, "submodule.%s.active", sub->name);
                git_config_set_gently(sb.buf, "true");
+               strbuf_reset(&sb);
        }
 
        /*
@@ -367,7 +624,6 @@ static void init_submodule(const char *path, const char *prefix, int quiet)
         * To look up the url in .git/config, we must not fall back to
         * .gitmodules, so look it up directly.
         */
-       strbuf_reset(&sb);
        strbuf_addf(&sb, "submodule.%s.url", sub->name);
        if (git_config_get_string(sb.buf, &url)) {
                if (!sub->url)
@@ -399,14 +655,14 @@ static void init_submodule(const char *path, const char *prefix, int quiet)
                if (git_config_set_gently(sb.buf, url))
                        die(_("Failed to register url for submodule path '%s'"),
                            displaypath);
-               if (!quiet)
+               if (!(flags & OPT_QUIET))
                        fprintf(stderr,
                                _("Submodule '%s' (%s) registered for path '%s'\n"),
                                sub->name, url, displaypath);
        }
+       strbuf_reset(&sb);
 
        /* Copy "update" setting when it is not set yet */
-       strbuf_reset(&sb);
        strbuf_addf(&sb, "submodule.%s.update", sub->name);
        if (git_config_get_string(sb.buf, &upd) &&
            sub->update_strategy.type != SM_UPDATE_UNSPECIFIED) {
@@ -426,12 +682,18 @@ static void init_submodule(const char *path, const char *prefix, int quiet)
        free(upd);
 }
 
+static void init_submodule_cb(const struct cache_entry *list_item, void *cb_data)
+{
+       struct init_cb *info = cb_data;
+       init_submodule(list_item->name, info->prefix, info->flags);
+}
+
 static int module_init(int argc, const char **argv, const char *prefix)
 {
+       struct init_cb info = INIT_CB_INIT;
        struct pathspec pathspec;
        struct module_list list = MODULE_LIST_INIT;
        int quiet = 0;
-       int i;
 
        struct option module_init_options[] = {
                OPT__QUIET(&quiet, N_("Suppress output for initializing a submodule")),
@@ -456,8 +718,173 @@ static int module_init(int argc, const char **argv, const char *prefix)
        if (!argc && git_config_get_value_multi("submodule.active"))
                module_list_active(&list);
 
-       for (i = 0; i < list.nr; i++)
-               init_submodule(list.entries[i]->name, prefix, quiet);
+       info.prefix = prefix;
+       if (quiet)
+               info.flags |= OPT_QUIET;
+
+       for_each_listed_submodule(&list, init_submodule_cb, &info);
+
+       return 0;
+}
+
+struct status_cb {
+       const char *prefix;
+       unsigned int flags;
+};
+
+#define STATUS_CB_INIT { NULL, 0 }
+
+static void print_status(unsigned int flags, char state, const char *path,
+                        const struct object_id *oid, const char *displaypath)
+{
+       if (flags & OPT_QUIET)
+               return;
+
+       printf("%c%s %s", state, oid_to_hex(oid), displaypath);
+
+       if (state == ' ' || state == '+') {
+               const char *name = compute_rev_name(path, oid_to_hex(oid));
+
+               if (name)
+                       printf(" (%s)", name);
+       }
+
+       printf("\n");
+}
+
+static int handle_submodule_head_ref(const char *refname,
+                                    const struct object_id *oid, int flags,
+                                    void *cb_data)
+{
+       struct object_id *output = cb_data;
+       if (oid)
+               oidcpy(output, oid);
+
+       return 0;
+}
+
+static void status_submodule(const char *path, const struct object_id *ce_oid,
+                            unsigned int ce_flags, const char *prefix,
+                            unsigned int flags)
+{
+       char *displaypath;
+       struct argv_array diff_files_args = ARGV_ARRAY_INIT;
+       struct rev_info rev;
+       int diff_files_result;
+
+       if (!submodule_from_path(the_repository, &null_oid, path))
+               die(_("no submodule mapping found in .gitmodules for path '%s'"),
+                     path);
+
+       displaypath = get_submodule_displaypath(path, prefix);
+
+       if ((CE_STAGEMASK & ce_flags) >> CE_STAGESHIFT) {
+               print_status(flags, 'U', path, &null_oid, displaypath);
+               goto cleanup;
+       }
+
+       if (!is_submodule_active(the_repository, path)) {
+               print_status(flags, '-', path, ce_oid, displaypath);
+               goto cleanup;
+       }
+
+       argv_array_pushl(&diff_files_args, "diff-files",
+                        "--ignore-submodules=dirty", "--quiet", "--",
+                        path, NULL);
+
+       git_config(git_diff_basic_config, NULL);
+       init_revisions(&rev, prefix);
+       rev.abbrev = 0;
+       diff_files_args.argc = setup_revisions(diff_files_args.argc,
+                                              diff_files_args.argv,
+                                              &rev, NULL);
+       diff_files_result = run_diff_files(&rev, 0);
+
+       if (!diff_result_code(&rev.diffopt, diff_files_result)) {
+               print_status(flags, ' ', path, ce_oid,
+                            displaypath);
+       } else if (!(flags & OPT_CACHED)) {
+               struct object_id oid;
+               struct ref_store *refs = get_submodule_ref_store(path);
+
+               if (!refs) {
+                       print_status(flags, '-', path, ce_oid, displaypath);
+                       goto cleanup;
+               }
+               if (refs_head_ref(refs, handle_submodule_head_ref, &oid))
+                       die(_("could not resolve HEAD ref inside the "
+                             "submodule '%s'"), path);
+
+               print_status(flags, '+', path, &oid, displaypath);
+       } else {
+               print_status(flags, '+', path, ce_oid, displaypath);
+       }
+
+       if (flags & OPT_RECURSIVE) {
+               struct child_process cpr = CHILD_PROCESS_INIT;
+
+               cpr.git_cmd = 1;
+               cpr.dir = path;
+               prepare_submodule_repo_env(&cpr.env_array);
+
+               argv_array_push(&cpr.args, "--super-prefix");
+               argv_array_pushf(&cpr.args, "%s/", displaypath);
+               argv_array_pushl(&cpr.args, "submodule--helper", "status",
+                                "--recursive", NULL);
+
+               if (flags & OPT_CACHED)
+                       argv_array_push(&cpr.args, "--cached");
+
+               if (flags & OPT_QUIET)
+                       argv_array_push(&cpr.args, "--quiet");
+
+               if (run_command(&cpr))
+                       die(_("failed to recurse into submodule '%s'"), path);
+       }
+
+cleanup:
+       argv_array_clear(&diff_files_args);
+       free(displaypath);
+}
+
+static void status_submodule_cb(const struct cache_entry *list_item,
+                               void *cb_data)
+{
+       struct status_cb *info = cb_data;
+       status_submodule(list_item->name, &list_item->oid, list_item->ce_flags,
+                        info->prefix, info->flags);
+}
+
+static int module_status(int argc, const char **argv, const char *prefix)
+{
+       struct status_cb info = STATUS_CB_INIT;
+       struct pathspec pathspec;
+       struct module_list list = MODULE_LIST_INIT;
+       int quiet = 0;
+
+       struct option module_status_options[] = {
+               OPT__QUIET(&quiet, N_("Suppress submodule status output")),
+               OPT_BIT(0, "cached", &info.flags, N_("Use commit stored in the index instead of the one stored in the submodule HEAD"), OPT_CACHED),
+               OPT_BIT(0, "recursive", &info.flags, N_("recurse into nested submodules"), OPT_RECURSIVE),
+               OPT_END()
+       };
+
+       const char *const git_submodule_helper_usage[] = {
+               N_("git submodule status [--quiet] [--cached] [--recursive] [<path>...]"),
+               NULL
+       };
+
+       argc = parse_options(argc, argv, prefix, module_status_options,
+                            git_submodule_helper_usage, 0);
+
+       if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
+               return 1;
+
+       info.prefix = prefix;
+       if (quiet)
+               info.flags |= OPT_QUIET;
+
+       for_each_listed_submodule(&list, status_submodule_cb, &info);
 
        return 0;
 }
@@ -469,7 +896,7 @@ static int module_name(int argc, const char **argv, const char *prefix)
        if (argc != 2)
                usage(_("git submodule--helper name <path>"));
 
-       sub = submodule_from_path(&null_oid, argv[1]);
+       sub = submodule_from_path(the_repository, &null_oid, argv[1]);
 
        if (!sub)
                die(_("no submodule mapping found in .gitmodules for path '%s'"),
@@ -480,8 +907,310 @@ static int module_name(int argc, const char **argv, const char *prefix)
        return 0;
 }
 
+struct sync_cb {
+       const char *prefix;
+       unsigned int flags;
+};
+
+#define SYNC_CB_INIT { NULL, 0 }
+
+static void sync_submodule(const char *path, const char *prefix,
+                          unsigned int flags)
+{
+       const struct submodule *sub;
+       char *remote_key = NULL;
+       char *sub_origin_url, *super_config_url, *displaypath;
+       struct strbuf sb = STRBUF_INIT;
+       struct child_process cp = CHILD_PROCESS_INIT;
+       char *sub_config_path = NULL;
+
+       if (!is_submodule_active(the_repository, path))
+               return;
+
+       sub = submodule_from_path(the_repository, &null_oid, path);
+
+       if (sub && sub->url) {
+               if (starts_with_dot_dot_slash(sub->url) ||
+                   starts_with_dot_slash(sub->url)) {
+                       char *remote_url, *up_path;
+                       char *remote = get_default_remote();
+                       strbuf_addf(&sb, "remote.%s.url", remote);
+
+                       if (git_config_get_string(sb.buf, &remote_url))
+                               remote_url = xgetcwd();
+
+                       up_path = get_up_path(path);
+                       sub_origin_url = relative_url(remote_url, sub->url, up_path);
+                       super_config_url = relative_url(remote_url, sub->url, NULL);
+
+                       free(remote);
+                       free(up_path);
+                       free(remote_url);
+               } else {
+                       sub_origin_url = xstrdup(sub->url);
+                       super_config_url = xstrdup(sub->url);
+               }
+       } else {
+               sub_origin_url = xstrdup("");
+               super_config_url = xstrdup("");
+       }
+
+       displaypath = get_submodule_displaypath(path, prefix);
+
+       if (!(flags & OPT_QUIET))
+               printf(_("Synchronizing submodule url for '%s'\n"),
+                        displaypath);
+
+       strbuf_reset(&sb);
+       strbuf_addf(&sb, "submodule.%s.url", sub->name);
+       if (git_config_set_gently(sb.buf, super_config_url))
+               die(_("failed to register url for submodule path '%s'"),
+                     displaypath);
+
+       if (!is_submodule_populated_gently(path, NULL))
+               goto cleanup;
+
+       prepare_submodule_repo_env(&cp.env_array);
+       cp.git_cmd = 1;
+       cp.dir = path;
+       argv_array_pushl(&cp.args, "submodule--helper",
+                        "print-default-remote", NULL);
+
+       strbuf_reset(&sb);
+       if (capture_command(&cp, &sb, 0))
+               die(_("failed to get the default remote for submodule '%s'"),
+                     path);
+
+       strbuf_strip_suffix(&sb, "\n");
+       remote_key = xstrfmt("remote.%s.url", sb.buf);
+
+       strbuf_reset(&sb);
+       submodule_to_gitdir(&sb, path);
+       strbuf_addstr(&sb, "/config");
+
+       if (git_config_set_in_file_gently(sb.buf, remote_key, sub_origin_url))
+               die(_("failed to update remote for submodule '%s'"),
+                     path);
+
+       if (flags & OPT_RECURSIVE) {
+               struct child_process cpr = CHILD_PROCESS_INIT;
+
+               cpr.git_cmd = 1;
+               cpr.dir = path;
+               prepare_submodule_repo_env(&cpr.env_array);
+
+               argv_array_push(&cpr.args, "--super-prefix");
+               argv_array_pushf(&cpr.args, "%s/", displaypath);
+               argv_array_pushl(&cpr.args, "submodule--helper", "sync",
+                                "--recursive", NULL);
+
+               if (flags & OPT_QUIET)
+                       argv_array_push(&cpr.args, "--quiet");
+
+               if (run_command(&cpr))
+                       die(_("failed to recurse into submodule '%s'"),
+                             path);
+       }
+
+cleanup:
+       free(super_config_url);
+       free(sub_origin_url);
+       strbuf_release(&sb);
+       free(remote_key);
+       free(displaypath);
+       free(sub_config_path);
+}
+
+static void sync_submodule_cb(const struct cache_entry *list_item, void *cb_data)
+{
+       struct sync_cb *info = cb_data;
+       sync_submodule(list_item->name, info->prefix, info->flags);
+}
+
+static int module_sync(int argc, const char **argv, const char *prefix)
+{
+       struct sync_cb info = SYNC_CB_INIT;
+       struct pathspec pathspec;
+       struct module_list list = MODULE_LIST_INIT;
+       int quiet = 0;
+       int recursive = 0;
+
+       struct option module_sync_options[] = {
+               OPT__QUIET(&quiet, N_("Suppress output of synchronizing submodule url")),
+               OPT_BOOL(0, "recursive", &recursive,
+                       N_("Recurse into nested submodules")),
+               OPT_END()
+       };
+
+       const char *const git_submodule_helper_usage[] = {
+               N_("git submodule--helper sync [--quiet] [--recursive] [<path>]"),
+               NULL
+       };
+
+       argc = parse_options(argc, argv, prefix, module_sync_options,
+                            git_submodule_helper_usage, 0);
+
+       if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
+               return 1;
+
+       info.prefix = prefix;
+       if (quiet)
+               info.flags |= OPT_QUIET;
+       if (recursive)
+               info.flags |= OPT_RECURSIVE;
+
+       for_each_listed_submodule(&list, sync_submodule_cb, &info);
+
+       return 0;
+}
+
+struct deinit_cb {
+       const char *prefix;
+       unsigned int flags;
+};
+#define DEINIT_CB_INIT { NULL, 0 }
+
+static void deinit_submodule(const char *path, const char *prefix,
+                            unsigned int flags)
+{
+       const struct submodule *sub;
+       char *displaypath = NULL;
+       struct child_process cp_config = CHILD_PROCESS_INIT;
+       struct strbuf sb_config = STRBUF_INIT;
+       char *sub_git_dir = xstrfmt("%s/.git", path);
+
+       sub = submodule_from_path(the_repository, &null_oid, path);
+
+       if (!sub || !sub->name)
+               goto cleanup;
+
+       displaypath = get_submodule_displaypath(path, prefix);
+
+       /* remove the submodule work tree (unless the user already did it) */
+       if (is_directory(path)) {
+               struct strbuf sb_rm = STRBUF_INIT;
+               const char *format;
+
+               /*
+                * protect submodules containing a .git directory
+                * NEEDSWORK: instead of dying, automatically call
+                * absorbgitdirs and (possibly) warn.
+                */
+               if (is_directory(sub_git_dir))
+                       die(_("Submodule work tree '%s' contains a .git "
+                             "directory (use 'rm -rf' if you really want "
+                             "to remove it including all of its history)"),
+                           displaypath);
+
+               if (!(flags & OPT_FORCE)) {
+                       struct child_process cp_rm = CHILD_PROCESS_INIT;
+                       cp_rm.git_cmd = 1;
+                       argv_array_pushl(&cp_rm.args, "rm", "-qn",
+                                        path, NULL);
+
+                       if (run_command(&cp_rm))
+                               die(_("Submodule work tree '%s' contains local "
+                                     "modifications; use '-f' to discard them"),
+                                     displaypath);
+               }
+
+               strbuf_addstr(&sb_rm, path);
+
+               if (!remove_dir_recursively(&sb_rm, 0))
+                       format = _("Cleared directory '%s'\n");
+               else
+                       format = _("Could not remove submodule work tree '%s'\n");
+
+               if (!(flags & OPT_QUIET))
+                       printf(format, displaypath);
+
+               strbuf_release(&sb_rm);
+       }
+
+       if (mkdir(path, 0777))
+               printf(_("could not create empty submodule directory %s"),
+                     displaypath);
+
+       cp_config.git_cmd = 1;
+       argv_array_pushl(&cp_config.args, "config", "--get-regexp", NULL);
+       argv_array_pushf(&cp_config.args, "submodule.%s\\.", sub->name);
+
+       /* remove the .git/config entries (unless the user already did it) */
+       if (!capture_command(&cp_config, &sb_config, 0) && sb_config.len) {
+               char *sub_key = xstrfmt("submodule.%s", sub->name);
+               /*
+                * remove the whole section so we have a clean state when
+                * the user later decides to init this submodule again
+                */
+               git_config_rename_section_in_file(NULL, sub_key, NULL);
+               if (!(flags & OPT_QUIET))
+                       printf(_("Submodule '%s' (%s) unregistered for path '%s'\n"),
+                                sub->name, sub->url, displaypath);
+               free(sub_key);
+       }
+
+cleanup:
+       free(displaypath);
+       free(sub_git_dir);
+       strbuf_release(&sb_config);
+}
+
+static void deinit_submodule_cb(const struct cache_entry *list_item,
+                               void *cb_data)
+{
+       struct deinit_cb *info = cb_data;
+       deinit_submodule(list_item->name, info->prefix, info->flags);
+}
+
+static int module_deinit(int argc, const char **argv, const char *prefix)
+{
+       struct deinit_cb info = DEINIT_CB_INIT;
+       struct pathspec pathspec;
+       struct module_list list = MODULE_LIST_INIT;
+       int quiet = 0;
+       int force = 0;
+       int all = 0;
+
+       struct option module_deinit_options[] = {
+               OPT__QUIET(&quiet, N_("Suppress submodule status output")),
+               OPT__FORCE(&force, N_("Remove submodule working trees even if they contain local changes"), 0),
+               OPT_BOOL(0, "all", &all, N_("Unregister all submodules")),
+               OPT_END()
+       };
+
+       const char *const git_submodule_helper_usage[] = {
+               N_("git submodule deinit [--quiet] [-f | --force] [--all | [--] [<path>...]]"),
+               NULL
+       };
+
+       argc = parse_options(argc, argv, prefix, module_deinit_options,
+                            git_submodule_helper_usage, 0);
+
+       if (all && argc) {
+               error("pathspec and --all are incompatible");
+               usage_with_options(git_submodule_helper_usage,
+                                  module_deinit_options);
+       }
+
+       if (!argc && !all)
+               die(_("Use '--all' if you really want to deinitialize all submodules"));
+
+       if (module_list_compute(argc, argv, prefix, &pathspec, &list) < 0)
+               return 1;
+
+       info.prefix = prefix;
+       if (quiet)
+               info.flags |= OPT_QUIET;
+       if (force)
+               info.flags |= OPT_FORCE;
+
+       for_each_listed_submodule(&list, deinit_submodule_cb, &info);
+
+       return 0;
+}
+
 static int clone_submodule(const char *path, const char *gitdir, const char *url,
-                          const char *depth, struct string_list *reference,
+                          const char *depth, struct string_list *reference, int dissociate,
                           int quiet, int progress)
 {
        struct child_process cp = CHILD_PROCESS_INIT;
@@ -500,9 +1229,12 @@ static int clone_submodule(const char *path, const char *gitdir, const char *url
                        argv_array_pushl(&cp.args, "--reference",
                                         item->string, NULL);
        }
+       if (dissociate)
+               argv_array_push(&cp.args, "--dissociate");
        if (gitdir && *gitdir)
                argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 
+       argv_array_push(&cp.args, "--");
        argv_array_push(&cp.args, url);
        argv_array_push(&cp.args, path);
 
@@ -615,6 +1347,7 @@ 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;
        char *sm_alternate = NULL, *error_strategy = NULL;
 
        struct option module_clone_options[] = {
@@ -633,12 +1366,16 @@ static int module_clone(int argc, const char **argv, const char *prefix)
                OPT_STRING_LIST(0, "reference", &reference,
                           N_("repo"),
                           N_("reference repository")),
+               OPT_BOOL(0, "dissociate", &dissociate,
+                          N_("use --reference only while cloning")),
                OPT_STRING(0, "depth", &depth,
                           N_("string"),
                           N_("depth for shallow clones")),
                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_END()
        };
 
@@ -666,17 +1403,23 @@ 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);
 
                prepare_possible_alternates(name, &reference);
 
-               if (clone_submodule(path, sm_gitdir, url, depth, &reference,
+               if (clone_submodule(path, sm_gitdir, url, depth, &reference, dissociate,
                                    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);
@@ -684,8 +1427,7 @@ static int module_clone(int argc, const char **argv, const char *prefix)
                strbuf_reset(&sb);
        }
 
-       /* Connect module worktree and git dir */
-       connect_work_tree_and_git_dir(path, sm_gitdir);
+       connect_work_tree_and_git_dir(path, sm_gitdir, 0);
 
        p = git_pathdup_submodule(path, "config");
        if (!p)
@@ -725,6 +1467,8 @@ struct submodule_update_clone {
        int quiet;
        int recommend_shallow;
        struct string_list references;
+       int dissociate;
+       unsigned require_init;
        const char *depth;
        const char *recursive_prefix;
        const char *prefix;
@@ -740,7 +1484,7 @@ struct submodule_update_clone {
        int failed_clones_nr, failed_clones_alloc;
 };
 #define SUBMODULE_UPDATE_CLONE_INIT {0, MODULE_LIST_INIT, 0, \
-       SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, \
+       SUBMODULE_UPDATE_STRATEGY_INIT, 0, 0, -1, STRING_LIST_INIT_DUP, 0, 0, \
        NULL, NULL, NULL, \
        STRING_LIST_INIT_DUP, 0, NULL, 0, 0}
 
@@ -792,7 +1536,7 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
                goto cleanup;
        }
 
-       sub = submodule_from_path(&null_oid, ce->name);
+       sub = submodule_from_path(the_repository, &null_oid, ce->name);
 
        if (suc->recursive_prefix)
                displaypath = relative_path(suc->recursive_prefix,
@@ -859,6 +1603,8 @@ 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);
@@ -867,6 +1613,8 @@ static int prepare_to_clone_next_submodule(const struct cache_entry *ce,
                for_each_string_list_item(item, &suc->references)
                        argv_array_pushl(&child->args, "--reference", item->string, NULL);
        }
+       if (suc->dissociate)
+               argv_array_push(&child->args, "--dissociate");
        if (suc->depth)
                argv_array_push(&child->args, suc->depth);
 
@@ -970,8 +1718,8 @@ static int update_clone_task_finished(int result,
        return 0;
 }
 
-static int gitmodules_update_clone_config(const char *var, const char *value,
-                                         void *cb)
+static int git_update_clone_config(const char *var, const char *value,
+                                  void *cb)
 {
        int *max_jobs = cb;
        if (!strcmp(var, "submodule.fetchjobs"))
@@ -1000,6 +1748,8 @@ static int update_clone(int argc, const char **argv, const char *prefix)
                           N_("rebase, merge, checkout or none")),
                OPT_STRING_LIST(0, "reference", &suc.references, N_("repo"),
                           N_("reference repository")),
+               OPT_BOOL(0, "dissociate", &suc.dissociate,
+                          N_("use --reference only while cloning")),
                OPT_STRING(0, "depth", &suc.depth, "<depth>",
                           N_("Create a shallow clone truncated to the "
                              "specified number of revisions")),
@@ -1010,6 +1760,8 @@ 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_END()
        };
 
@@ -1019,8 +1771,8 @@ static int update_clone(int argc, const char **argv, const char *prefix)
        };
        suc.prefix = prefix;
 
-       config_from_gitmodules(gitmodules_update_clone_config, &max_jobs);
-       git_config(gitmodules_update_clone_config, &max_jobs);
+       update_clone_config_from_gitmodules(&max_jobs);
+       git_config(git_update_clone_config, &max_jobs);
 
        argc = parse_options(argc, argv, prefix, module_update_clone_options,
                             git_submodule_helper_usage, 0);
@@ -1075,7 +1827,7 @@ static const char *remote_submodule_branch(const char *path)
        const char *branch = NULL;
        char *key;
 
-       sub = submodule_from_path(&null_oid, path);
+       sub = submodule_from_path(the_repository, &null_oid, path);
        if (!sub)
                return NULL;
 
@@ -1144,7 +1896,7 @@ static int push_check(int argc, const char **argv, const char *prefix)
        argv++;
        argc--;
        /* Get the submodule's head ref and determine if it is detached */
-       head = resolve_refdup("HEAD", 0, head_oid.hash, NULL);
+       head = resolve_refdup("HEAD", 0, &head_oid, NULL);
        if (!head)
                die(_("Failed to resolve HEAD as a valid ref."));
        if (!strcmp(head, "HEAD"))
@@ -1160,13 +1912,14 @@ static int push_check(int argc, const char **argv, const char *prefix)
 
        /* Check the refspec */
        if (argc > 2) {
-               int i, refspec_nr = argc - 2;
+               int i;
                struct ref *local_refs = get_local_heads();
-               struct refspec *refspec = parse_push_refspec(refspec_nr,
-                                                            argv + 2);
+               struct refspec refspec = REFSPEC_INIT_PUSH;
+
+               refspec_appendn(&refspec, argv + 2, argc - 2);
 
-               for (i = 0; i < refspec_nr; i++) {
-                       struct refspec *rs = refspec + i;
+               for (i = 0; i < refspec.nr; i++) {
+                       const struct refspec_item *rs = &refspec.items[i];
 
                        if (rs->pattern || rs->matching)
                                continue;
@@ -1193,7 +1946,7 @@ static int push_check(int argc, const char **argv, const char *prefix)
                                    rs->src);
                        }
                }
-               free_refspec(refspec_nr, refspec);
+               refspec_clear(&refspec);
        }
        free(head);
 
@@ -1281,7 +2034,12 @@ static struct cmd_struct commands[] = {
        {"relative-path", resolve_relative_path, 0},
        {"resolve-relative-url", resolve_relative_url, 0},
        {"resolve-relative-url-test", resolve_relative_url_test, 0},
+       {"foreach", module_foreach, SUPPORT_SUPER_PREFIX},
        {"init", module_init, SUPPORT_SUPER_PREFIX},
+       {"status", module_status, SUPPORT_SUPER_PREFIX},
+       {"print-default-remote", print_default_remote, 0},
+       {"sync", module_sync, SUPPORT_SUPER_PREFIX},
+       {"deinit", module_deinit, 0},
        {"remote-branch", resolve_remote_submodule_branch, 0},
        {"push-check", push_check, 0},
        {"absorb-git-dirs", absorb_git_dirs, SUPPORT_SUPER_PREFIX},