Merge branch 'maint-2.5' into maint-2.6
[gitweb.git] / submodule.c
index 30e1d5bc8365b8320903c34c4e7a91c444d556f2..a458100ed2c2c70e80fd8c4f1cebc23a5ac1c08e 100644 (file)
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "submodule-config.h"
 #include "submodule.h"
 #include "dir.h"
 #include "diff.h"
 #include "string-list.h"
 #include "sha1-array.h"
 #include "argv-array.h"
+#include "blob.h"
 
-static struct string_list config_name_for_path;
-static struct string_list config_fetch_recurse_submodules_for_name;
-static struct string_list config_ignore_for_name;
 static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
 static struct string_list changed_submodule_paths;
 static int initialized_fetch_ref_tips;
@@ -30,20 +29,101 @@ static struct sha1_array ref_tips_after_fetch;
  */
 static int gitmodules_is_unmerged;
 
+/*
+ * This flag is set if the .gitmodules file had unstaged modifications on
+ * startup. This must be checked before allowing modifications to the
+ * .gitmodules file with the intention to stage them later, because when
+ * continuing we would stage the modifications the user didn't stage herself
+ * too. That might change in a future version when we learn to stage the
+ * changes we do ourselves without staging any previous modifications.
+ */
+static int gitmodules_is_modified;
+
+int is_staging_gitmodules_ok(void)
+{
+       return !gitmodules_is_modified;
+}
+
+/*
+ * Try to update the "path" entry in the "submodule.<name>" section of the
+ * .gitmodules file. Return 0 only if a .gitmodules file was found, a section
+ * with the correct path=<oldpath> setting was found and we could update it.
+ */
+int update_path_in_gitmodules(const char *oldpath, const char *newpath)
+{
+       struct strbuf entry = STRBUF_INIT;
+       const struct submodule *submodule;
+
+       if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
+               return -1;
+
+       if (gitmodules_is_unmerged)
+               die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
+
+       submodule = submodule_from_path(null_sha1, oldpath);
+       if (!submodule || !submodule->name) {
+               warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
+               return -1;
+       }
+       strbuf_addstr(&entry, "submodule.");
+       strbuf_addstr(&entry, submodule->name);
+       strbuf_addstr(&entry, ".path");
+       if (git_config_set_in_file(".gitmodules", entry.buf, newpath) < 0) {
+               /* Maybe the user already did that, don't error out here */
+               warning(_("Could not update .gitmodules entry %s"), entry.buf);
+               strbuf_release(&entry);
+               return -1;
+       }
+       strbuf_release(&entry);
+       return 0;
+}
+
+/*
+ * Try to remove the "submodule.<name>" section from .gitmodules where the given
+ * path is configured. Return 0 only if a .gitmodules file was found, a section
+ * with the correct path=<path> setting was found and we could remove it.
+ */
+int remove_path_from_gitmodules(const char *path)
+{
+       struct strbuf sect = STRBUF_INIT;
+       const struct submodule *submodule;
+
+       if (!file_exists(".gitmodules")) /* Do nothing without .gitmodules */
+               return -1;
+
+       if (gitmodules_is_unmerged)
+               die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
+
+       submodule = submodule_from_path(null_sha1, path);
+       if (!submodule || !submodule->name) {
+               warning(_("Could not find section in .gitmodules where path=%s"), path);
+               return -1;
+       }
+       strbuf_addstr(&sect, "submodule.");
+       strbuf_addstr(&sect, submodule->name);
+       if (git_config_rename_section_in_file(".gitmodules", sect.buf, NULL) < 0) {
+               /* Maybe the user already did that, don't error out here */
+               warning(_("Could not remove .gitmodules entry for %s"), path);
+               strbuf_release(&sect);
+               return -1;
+       }
+       strbuf_release(&sect);
+       return 0;
+}
+
+void stage_updated_gitmodules(void)
+{
+       if (add_file_to_cache(".gitmodules", 0))
+               die(_("staging updated .gitmodules failed"));
+}
+
 static int add_submodule_odb(const char *path)
 {
        struct strbuf objects_directory = STRBUF_INIT;
        struct alternate_object_database *alt_odb;
        int ret = 0;
-       const char *git_dir;
 
-       strbuf_addf(&objects_directory, "%s/.git", path);
-       git_dir = read_gitfile(objects_directory.buf);
-       if (git_dir) {
-               strbuf_reset(&objects_directory);
-               strbuf_addstr(&objects_directory, git_dir);
-       }
-       strbuf_addstr(&objects_directory, "/objects/");
+       strbuf_git_path_submodule(&objects_directory, path, "objects/");
        if (!is_directory(objects_directory.buf)) {
                ret = -1;
                goto done;
@@ -75,12 +155,10 @@ static int add_submodule_odb(const char *path)
 void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
                                             const char *path)
 {
-       struct string_list_item *path_option, *ignore_option;
-       path_option = unsorted_string_list_lookup(&config_name_for_path, path);
-       if (path_option) {
-               ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
-               if (ignore_option)
-                       handle_ignore_submodules_arg(diffopt, ignore_option->util);
+       const struct submodule *submodule = submodule_from_path(null_sha1, path);
+       if (submodule) {
+               if (submodule->ignore)
+                       handle_ignore_submodules_arg(diffopt, submodule->ignore);
                else if (gitmodules_is_unmerged)
                        DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
        }
@@ -88,7 +166,7 @@ void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
 
 int submodule_config(const char *var, const char *value, void *cb)
 {
-       if (!prefixcmp(var, "submodule."))
+       if (starts_with(var, "submodule."))
                return parse_submodule_config_option(var, value);
        else if (!strcmp(var, "fetch.recursesubmodules")) {
                config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
@@ -116,6 +194,11 @@ void gitmodules_config(void)
                                    !memcmp(ce->name, ".gitmodules", 11))
                                        gitmodules_is_unmerged = 1;
                        }
+               } else if (pos < active_nr) {
+                       struct stat st;
+                       if (lstat(".gitmodules", &st) == 0 &&
+                           ce_match_stat(active_cache[pos], &st, 0) & DATA_CHANGED)
+                               gitmodules_is_modified = 1;
                }
 
                if (!gitmodules_is_unmerged)
@@ -124,53 +207,6 @@ void gitmodules_config(void)
        }
 }
 
-int parse_submodule_config_option(const char *var, const char *value)
-{
-       int len;
-       struct string_list_item *config;
-       struct strbuf submodname = STRBUF_INIT;
-
-       var += 10;              /* Skip "submodule." */
-
-       len = strlen(var);
-       if ((len > 5) && !strcmp(var + len - 5, ".path")) {
-               strbuf_add(&submodname, var, len - 5);
-               config = unsorted_string_list_lookup(&config_name_for_path, value);
-               if (config)
-                       free(config->util);
-               else
-                       config = string_list_append(&config_name_for_path, xstrdup(value));
-               config->util = strbuf_detach(&submodname, NULL);
-               strbuf_release(&submodname);
-       } else if ((len > 23) && !strcmp(var + len - 23, ".fetchrecursesubmodules")) {
-               strbuf_add(&submodname, var, len - 23);
-               config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, submodname.buf);
-               if (!config)
-                       config = string_list_append(&config_fetch_recurse_submodules_for_name,
-                                                   strbuf_detach(&submodname, NULL));
-               config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
-               strbuf_release(&submodname);
-       } else if ((len > 7) && !strcmp(var + len - 7, ".ignore")) {
-               if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
-                   strcmp(value, "all") && strcmp(value, "none")) {
-                       warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
-                       return 0;
-               }
-
-               strbuf_add(&submodname, var, len - 7);
-               config = unsorted_string_list_lookup(&config_ignore_for_name, submodname.buf);
-               if (config)
-                       free(config->util);
-               else
-                       config = string_list_append(&config_ignore_for_name,
-                                                   strbuf_detach(&submodname, NULL));
-               strbuf_release(&submodname);
-               config->util = xstrdup(value);
-               return 0;
-       }
-       return 0;
-}
-
 void handle_ignore_submodules_arg(struct diff_options *diffopt,
                                  const char *arg)
 {
@@ -201,7 +237,7 @@ static int prepare_submodule_summary(struct rev_info *rev, const char *path,
        left->object.flags |= SYMMETRIC_LEFT;
        add_pending_object(rev, &left->object, path);
        add_pending_object(rev, &right->object, path);
-       merge_bases = get_merge_bases(left, right, 1);
+       merge_bases = get_merge_bases(left, right);
        if (merge_bases) {
                if (merge_bases->item == left)
                        *fast_forward = 1;
@@ -217,6 +253,7 @@ static int prepare_submodule_summary(struct rev_info *rev, const char *path,
 }
 
 static void print_submodule_summary(struct rev_info *rev, FILE *f,
+               const char *line_prefix,
                const char *del, const char *add, const char *reset)
 {
        static const char format[] = "  %m %s";
@@ -226,7 +263,9 @@ static void print_submodule_summary(struct rev_info *rev, FILE *f,
        while ((commit = get_revision(rev))) {
                struct pretty_print_context ctx = {0};
                ctx.date_mode = rev->date_mode;
+               ctx.output_encoding = get_log_output_encoding();
                strbuf_setlen(&sb, 0);
+               strbuf_addstr(&sb, line_prefix);
                if (commit->object.flags & SYMMETRIC_LEFT) {
                        if (del)
                                strbuf_addstr(&sb, del);
@@ -242,27 +281,14 @@ static void print_submodule_summary(struct rev_info *rev, FILE *f,
        strbuf_release(&sb);
 }
 
-int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
-{
-       switch (git_config_maybe_bool(opt, arg)) {
-       case 1:
-               return RECURSE_SUBMODULES_ON;
-       case 0:
-               return RECURSE_SUBMODULES_OFF;
-       default:
-               if (!strcmp(arg, "on-demand"))
-                       return RECURSE_SUBMODULES_ON_DEMAND;
-               die("bad %s argument: %s", opt, arg);
-       }
-}
-
 void show_submodule_summary(FILE *f, const char *path,
+               const char *line_prefix,
                unsigned char one[20], unsigned char two[20],
-               unsigned dirty_submodule,
+               unsigned dirty_submodule, const char *meta,
                const char *del, const char *add, const char *reset)
 {
        struct rev_info rev;
-       struct commit *left = left, *right = right;
+       struct commit *left = NULL, *right = NULL;
        const char *message = NULL;
        struct strbuf sb = STRBUF_INIT;
        int fast_forward = 0, fast_backward = 0;
@@ -276,38 +302,39 @@ void show_submodule_summary(FILE *f, const char *path,
        else if (!(left = lookup_commit_reference(one)) ||
                 !(right = lookup_commit_reference(two)))
                message = "(commits not present)";
-
-       if (!message &&
-           prepare_submodule_summary(&rev, path, left, right,
-                                       &fast_forward, &fast_backward))
+       else if (prepare_submodule_summary(&rev, path, left, right,
+                                          &fast_forward, &fast_backward))
                message = "(revision walker failed)";
 
        if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
-               fprintf(f, "Submodule %s contains untracked content\n", path);
+               fprintf(f, "%sSubmodule %s contains untracked content\n",
+                       line_prefix, path);
        if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
-               fprintf(f, "Submodule %s contains modified content\n", path);
+               fprintf(f, "%sSubmodule %s contains modified content\n",
+                       line_prefix, path);
 
        if (!hashcmp(one, two)) {
                strbuf_release(&sb);
                return;
        }
 
-       strbuf_addf(&sb, "Submodule %s %s..", path,
+       strbuf_addf(&sb, "%s%sSubmodule %s %s..", line_prefix, meta, path,
                        find_unique_abbrev(one, DEFAULT_ABBREV));
        if (!fast_backward && !fast_forward)
                strbuf_addch(&sb, '.');
        strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
        if (message)
-               strbuf_addf(&sb, " %s\n", message);
+               strbuf_addf(&sb, " %s%s\n", message, reset);
        else
-               strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
+               strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset);
        fwrite(sb.buf, sb.len, 1, f);
 
-       if (!message) {
-               print_submodule_summary(&rev, f, del, add, reset);
+       if (!message) /* only NULL if we succeeded in setting up the walk */
+               print_submodule_summary(&rev, f, line_prefix, del, add, reset);
+       if (left)
                clear_commit_marks(left, ~0);
+       if (right)
                clear_commit_marks(right, ~0);
-       }
 
        strbuf_release(&sb);
 }
@@ -317,7 +344,8 @@ void set_config_fetch_recurse_submodules(int value)
        config_fetch_recurse_submodules = value;
 }
 
-static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
+static int has_remote(const char *refname, const struct object_id *oid,
+                     int flags, void *cb_data)
 {
        return 1;
 }
@@ -328,13 +356,12 @@ static int submodule_needs_pushing(const char *path, const unsigned char sha1[20
                return 0;
 
        if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
-               struct child_process cp;
+               struct child_process cp = CHILD_PROCESS_INIT;
                const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
                struct strbuf buf = STRBUF_INIT;
                int needs_pushing = 0;
 
                argv[1] = sha1_to_hex(sha1);
-               memset(&cp, 0, sizeof(cp));
                cp.argv = argv;
                cp.env = local_repo_env;
                cp.git_cmd = 1;
@@ -360,21 +387,19 @@ static void collect_submodules_from_diff(struct diff_queue_struct *q,
                                         void *data)
 {
        int i;
-       int *needs_pushing = data;
+       struct string_list *needs_pushing = data;
 
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p = q->queue[i];
                if (!S_ISGITLINK(p->two->mode))
                        continue;
-               if (submodule_needs_pushing(p->two->path, p->two->sha1)) {
-                       *needs_pushing = 1;
-                       break;
-               }
+               if (submodule_needs_pushing(p->two->path, p->two->sha1))
+                       string_list_insert(needs_pushing, p->two->path);
        }
 }
 
-
-static void commit_need_pushing(struct commit *commit, int *needs_pushing)
+static void find_unpushed_submodule_commits(struct commit *commit,
+               struct string_list *needs_pushing)
 {
        struct rev_info rev;
 
@@ -385,14 +410,15 @@ static void commit_need_pushing(struct commit *commit, int *needs_pushing)
        diff_tree_combined_merge(commit, 1, &rev);
 }
 
-int check_submodule_needs_pushing(unsigned char new_sha1[20], const char *remotes_name)
+int find_unpushed_submodules(unsigned char new_sha1[20],
+               const char *remotes_name, struct string_list *needs_pushing)
 {
        struct rev_info rev;
        struct commit *commit;
        const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
        int argc = ARRAY_SIZE(argv) - 1;
        char *sha1_copy;
-       int needs_pushing = 0;
+
        struct strbuf remotes_arg = STRBUF_INIT;
 
        strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
@@ -404,13 +430,58 @@ int check_submodule_needs_pushing(unsigned char new_sha1[20], const char *remote
        if (prepare_revision_walk(&rev))
                die("revision walk setup failed");
 
-       while ((commit = get_revision(&rev)) && !needs_pushing)
-               commit_need_pushing(commit, &needs_pushing);
+       while ((commit = get_revision(&rev)) != NULL)
+               find_unpushed_submodule_commits(commit, needs_pushing);
 
+       reset_revision_walk();
        free(sha1_copy);
        strbuf_release(&remotes_arg);
 
-       return needs_pushing;
+       return needs_pushing->nr;
+}
+
+static int push_submodule(const char *path)
+{
+       if (add_submodule_odb(path))
+               return 1;
+
+       if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
+               struct child_process cp = CHILD_PROCESS_INIT;
+               const char *argv[] = {"push", NULL};
+
+               cp.argv = argv;
+               cp.env = local_repo_env;
+               cp.git_cmd = 1;
+               cp.no_stdin = 1;
+               cp.dir = path;
+               if (run_command(&cp))
+                       return 0;
+               close(cp.out);
+       }
+
+       return 1;
+}
+
+int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
+{
+       int i, ret = 1;
+       struct string_list needs_pushing = STRING_LIST_INIT_DUP;
+
+       if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
+               return 1;
+
+       for (i = 0; i < needs_pushing.nr; i++) {
+               const char *path = needs_pushing.items[i].string;
+               fprintf(stderr, "Pushing submodule '%s'\n", path);
+               if (!push_submodule(path)) {
+                       fprintf(stderr, "Unable to push submodule '%s'\n", path);
+                       ret = 0;
+               }
+       }
+
+       string_list_clear(&needs_pushing, 0);
+
+       return ret;
 }
 
 static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
@@ -419,22 +490,19 @@ static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
        if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
                /* Even if the submodule is checked out and the commit is
                 * present, make sure it is reachable from a ref. */
-               struct child_process cp;
+               struct child_process cp = CHILD_PROCESS_INIT;
                const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
                struct strbuf buf = STRBUF_INIT;
 
                argv[3] = sha1_to_hex(sha1);
-               memset(&cp, 0, sizeof(cp));
                cp.argv = argv;
                cp.env = local_repo_env;
                cp.git_cmd = 1;
                cp.no_stdin = 1;
-               cp.out = -1;
                cp.dir = path;
-               if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
+               if (!capture_command(&cp, &buf, 1024) && !buf.len)
                        is_present = 1;
 
-               close(cp.out);
                strbuf_release(&buf);
        }
        return is_present;
@@ -471,10 +539,10 @@ static void submodule_collect_changed_cb(struct diff_queue_struct *q,
        }
 }
 
-static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
+static int add_sha1_to_array(const char *ref, const struct object_id *oid,
                             int flags, void *data)
 {
-       sha1_array_append(data, sha1);
+       sha1_array_append(data, oid->hash);
        return 0;
 }
 
@@ -500,7 +568,7 @@ static void calculate_changed_submodule_paths(void)
        struct argv_array argv = ARGV_ARRAY_INIT;
 
        /* No need to check if there are no submodules configured */
-       if (!config_name_for_path.nr)
+       if (!submodule_from_path(NULL, NULL))
                return;
 
        init_revisions(&rev, NULL);
@@ -526,8 +594,7 @@ static void calculate_changed_submodule_paths(void)
                        DIFF_OPT_SET(&diff_opts, RECURSIVE);
                        diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
                        diff_opts.format_callback = submodule_collect_changed_cb;
-                       if (diff_setup_done(&diff_opts) < 0)
-                               die("diff_setup_done failed");
+                       diff_setup_done(&diff_opts);
                        diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
                        diffcore_std(&diff_opts);
                        diff_flush(&diff_opts);
@@ -541,33 +608,26 @@ static void calculate_changed_submodule_paths(void)
        initialized_fetch_ref_tips = 0;
 }
 
-int fetch_populated_submodules(int num_options, const char **options,
+int fetch_populated_submodules(const struct argv_array *options,
                               const char *prefix, int command_line_option,
                               int quiet)
 {
-       int i, result = 0, argc = 0, default_argc;
-       struct child_process cp;
-       const char **argv;
-       struct string_list_item *name_for_path;
+       int i, result = 0;
+       struct child_process cp = CHILD_PROCESS_INIT;
+       struct argv_array argv = ARGV_ARRAY_INIT;
        const char *work_tree = get_git_work_tree();
        if (!work_tree)
                goto out;
 
-       if (!the_index.initialized)
-               if (read_cache() < 0)
-                       die("index file corrupt");
+       if (read_cache() < 0)
+               die("index file corrupt");
 
-       /* 6: "fetch" (options) --recurse-submodules-default default "--submodule-prefix" prefix NULL */
-       argv = xcalloc(num_options + 6, sizeof(const char *));
-       argv[argc++] = "fetch";
-       for (i = 0; i < num_options; i++)
-               argv[argc++] = options[i];
-       argv[argc++] = "--recurse-submodules-default";
-       default_argc = argc++;
-       argv[argc++] = "--submodule-prefix";
+       argv_array_push(&argv, "fetch");
+       for (i = 0; i < options->argc; i++)
+               argv_array_push(&argv, options->argv[i]);
+       argv_array_push(&argv, "--recurse-submodules-default");
+       /* default value, "--submodule-prefix" and its value are added later */
 
-       memset(&cp, 0, sizeof(cp));
-       cp.argv = argv;
        cp.env = local_repo_env;
        cp.git_cmd = 1;
        cp.no_stdin = 1;
@@ -578,25 +638,27 @@ int fetch_populated_submodules(int num_options, const char **options,
                struct strbuf submodule_path = STRBUF_INIT;
                struct strbuf submodule_git_dir = STRBUF_INIT;
                struct strbuf submodule_prefix = STRBUF_INIT;
-               struct cache_entry *ce = active_cache[i];
-               const char *git_dir, *name, *default_argv;
+               const struct cache_entry *ce = active_cache[i];
+               const char *git_dir, *default_argv;
+               const struct submodule *submodule;
 
                if (!S_ISGITLINK(ce->ce_mode))
                        continue;
 
-               name = ce->name;
-               name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
-               if (name_for_path)
-                       name = name_for_path->util;
+               submodule = submodule_from_path(null_sha1, ce->name);
+               if (!submodule)
+                       submodule = submodule_from_name(null_sha1, ce->name);
 
                default_argv = "yes";
                if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
-                       struct string_list_item *fetch_recurse_submodules_option;
-                       fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
-                       if (fetch_recurse_submodules_option) {
-                               if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
+                       if (submodule &&
+                           submodule->fetch_recurse !=
+                                               RECURSE_SUBMODULES_NONE) {
+                               if (submodule->fetch_recurse ==
+                                               RECURSE_SUBMODULES_OFF)
                                        continue;
-                               if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
+                               if (submodule->fetch_recurse ==
+                                               RECURSE_SUBMODULES_ON_DEMAND) {
                                        if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
                                                continue;
                                        default_argv = "on-demand";
@@ -627,16 +689,21 @@ int fetch_populated_submodules(int num_options, const char **options,
                        if (!quiet)
                                printf("Fetching submodule %s%s\n", prefix, ce->name);
                        cp.dir = submodule_path.buf;
-                       argv[default_argc] = default_argv;
-                       argv[argc] = submodule_prefix.buf;
+                       argv_array_push(&argv, default_argv);
+                       argv_array_push(&argv, "--submodule-prefix");
+                       argv_array_push(&argv, submodule_prefix.buf);
+                       cp.argv = argv.argv;
                        if (run_command(&cp))
                                result = 1;
+                       argv_array_pop(&argv);
+                       argv_array_pop(&argv);
+                       argv_array_pop(&argv);
                }
                strbuf_release(&submodule_path);
                strbuf_release(&submodule_git_dir);
                strbuf_release(&submodule_prefix);
        }
-       free(argv);
+       argv_array_clear(&argv);
 out:
        string_list_clear(&changed_submodule_paths, 1);
        return result;
@@ -645,7 +712,7 @@ int fetch_populated_submodules(int num_options, const char **options,
 unsigned is_submodule_modified(const char *path, int ignore_untracked)
 {
        ssize_t len;
-       struct child_process cp;
+       struct child_process cp = CHILD_PROCESS_INIT;
        const char *argv[] = {
                "status",
                "--porcelain",
@@ -672,7 +739,6 @@ unsigned is_submodule_modified(const char *path, int ignore_untracked)
        if (ignore_untracked)
                argv[2] = "-uno";
 
-       memset(&cp, 0, sizeof(cp));
        cp.argv = argv;
        cp.env = local_repo_env;
        cp.git_cmd = 1;
@@ -711,11 +777,88 @@ unsigned is_submodule_modified(const char *path, int ignore_untracked)
        return dirty_submodule;
 }
 
+int submodule_uses_gitfile(const char *path)
+{
+       struct child_process cp = CHILD_PROCESS_INIT;
+       const char *argv[] = {
+               "submodule",
+               "foreach",
+               "--quiet",
+               "--recursive",
+               "test -f .git",
+               NULL,
+       };
+       struct strbuf buf = STRBUF_INIT;
+       const char *git_dir;
+
+       strbuf_addf(&buf, "%s/.git", path);
+       git_dir = read_gitfile(buf.buf);
+       if (!git_dir) {
+               strbuf_release(&buf);
+               return 0;
+       }
+       strbuf_release(&buf);
+
+       /* Now test that all nested submodules use a gitfile too */
+       cp.argv = argv;
+       cp.env = local_repo_env;
+       cp.git_cmd = 1;
+       cp.no_stdin = 1;
+       cp.no_stderr = 1;
+       cp.no_stdout = 1;
+       cp.dir = path;
+       if (run_command(&cp))
+               return 0;
+
+       return 1;
+}
+
+int ok_to_remove_submodule(const char *path)
+{
+       ssize_t len;
+       struct child_process cp = CHILD_PROCESS_INIT;
+       const char *argv[] = {
+               "status",
+               "--porcelain",
+               "-u",
+               "--ignore-submodules=none",
+               NULL,
+       };
+       struct strbuf buf = STRBUF_INIT;
+       int ok_to_remove = 1;
+
+       if (!file_exists(path) || is_empty_dir(path))
+               return 1;
+
+       if (!submodule_uses_gitfile(path))
+               return 0;
+
+       cp.argv = argv;
+       cp.env = local_repo_env;
+       cp.git_cmd = 1;
+       cp.no_stdin = 1;
+       cp.out = -1;
+       cp.dir = path;
+       if (start_command(&cp))
+               die("Could not run 'git status --porcelain -uall --ignore-submodules=none' in submodule %s", path);
+
+       len = strbuf_read(&buf, cp.out, 1024);
+       if (len > 2)
+               ok_to_remove = 0;
+       close(cp.out);
+
+       if (finish_command(&cp))
+               die("'git status --porcelain -uall --ignore-submodules=none' failed in submodule %s", path);
+
+       strbuf_release(&buf);
+       return ok_to_remove;
+}
+
 static int find_first_merges(struct object_array *result, const char *path,
                struct commit *a, struct commit *b)
 {
        int i, j;
-       struct object_array merges;
+       struct object_array merges = OBJECT_ARRAY_INIT;
        struct commit *commit;
        int contains_another;
 
@@ -725,7 +868,6 @@ static int find_first_merges(struct object_array *result, const char *path,
        struct rev_info revs;
        struct setup_revision_opt rev_opts;
 
-       memset(&merges, 0, sizeof(merges));
        memset(result, 0, sizeof(struct object_array));
        memset(&rev_opts, 0, sizeof(rev_opts));
 
@@ -734,16 +876,17 @@ static int find_first_merges(struct object_array *result, const char *path,
                        sha1_to_hex(a->object.sha1));
        init_revisions(&revs, NULL);
        rev_opts.submodule = path;
-       setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);
+       setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
 
        /* save all revisions from the above list that contain b */
        if (prepare_revision_walk(&revs))
                die("revision walk setup failed");
        while ((commit = get_revision(&revs)) != NULL) {
                struct object *o = &(commit->object);
-               if (in_merge_bases(b, &commit, 1))
+               if (in_merge_bases(b, commit))
                        add_object_array(o, NULL, &merges);
        }
+       reset_revision_walk();
 
        /* Now we've got all merges that contain a and b. Prune all
         * merges that contain another found merge and save them in
@@ -755,15 +898,14 @@ static int find_first_merges(struct object_array *result, const char *path,
                contains_another = 0;
                for (j = 0; j < merges.nr; j++) {
                        struct commit *m2 = (struct commit *) merges.objects[j].item;
-                       if (i != j && in_merge_bases(m2, &m1, 1)) {
+                       if (i != j && in_merge_bases(m2, m1)) {
                                contains_another = 1;
                                break;
                        }
                }
 
                if (!contains_another)
-                       add_object_array(merges.objects[i].item,
-                                        merges.objects[i].name, result);
+                       add_object_array(merges.objects[i].item, NULL, result);
        }
 
        free(merges.objects);
@@ -774,7 +916,7 @@ static void print_commit(struct commit *commit)
 {
        struct strbuf sb = STRBUF_INIT;
        struct pretty_print_context ctx = {0};
-       ctx.date_mode = DATE_NORMAL;
+       ctx.date_mode.type = DATE_NORMAL;
        format_commit_message(commit, " %h: %m %s", &sb, &ctx);
        fprintf(stderr, "%s\n", sb.buf);
        strbuf_release(&sb);
@@ -817,18 +959,18 @@ int merge_submodule(unsigned char result[20], const char *path,
        }
 
        /* check whether both changes are forward */
-       if (!in_merge_bases(commit_base, &commit_a, 1) ||
-           !in_merge_bases(commit_base, &commit_b, 1)) {
+       if (!in_merge_bases(commit_base, commit_a) ||
+           !in_merge_bases(commit_base, commit_b)) {
                MERGE_WARNING(path, "commits don't follow merge-base");
                return 0;
        }
 
        /* Case #1: a is contained in b or vice versa */
-       if (in_merge_bases(commit_a, &commit_b, 1)) {
+       if (in_merge_bases(commit_a, commit_b)) {
                hashcpy(result, b);
                return 1;
        }
-       if (in_merge_bases(commit_b, &commit_a, 1)) {
+       if (in_merge_bases(commit_b, commit_a)) {
                hashcpy(result, a);
                return 1;
        }
@@ -874,3 +1016,29 @@ int merge_submodule(unsigned char result[20], const char *path,
        free(merges.objects);
        return 0;
 }
+
+/* Update gitfile and core.worktree setting to connect work tree and git dir */
+void connect_work_tree_and_git_dir(const char *work_tree, const char *git_dir)
+{
+       struct strbuf file_name = STRBUF_INIT;
+       struct strbuf rel_path = STRBUF_INIT;
+       const char *real_work_tree = xstrdup(real_path(work_tree));
+
+       /* Update gitfile */
+       strbuf_addf(&file_name, "%s/.git", work_tree);
+       write_file(file_name.buf, "gitdir: %s",
+                  relative_path(git_dir, real_work_tree, &rel_path));
+
+       /* Update core.worktree setting */
+       strbuf_reset(&file_name);
+       strbuf_addf(&file_name, "%s/config", git_dir);
+       if (git_config_set_in_file(file_name.buf, "core.worktree",
+                                  relative_path(real_work_tree, git_dir,
+                                                &rel_path)))
+               die(_("Could not set core.worktree in %s"),
+                   file_name.buf);
+
+       strbuf_release(&file_name);
+       strbuf_release(&rel_path);
+       free((void *)real_work_tree);
+}