#include "cache.h" #include "submodule-config.h" #include "submodule.h" #include "dir.h" #include "diff.h" #include "commit.h" #include "revision.h" #include "run-command.h" #include "diffcore.h" #include "refs.h" #include "string-list.h" #include "sha1-array.h" #include "argv-array.h" #include "blob.h" #include "thread-utils.h" #include "quote.h" #include "worktree.h" static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND; static int config_update_recurse_submodules = RECURSE_SUBMODULES_DEFAULT; static int parallel_jobs = 1; static struct string_list changed_submodule_paths = STRING_LIST_INIT_NODUP; static int initialized_fetch_ref_tips; static struct sha1_array ref_tips_before_fetch; static struct sha1_array ref_tips_after_fetch; /* * The following flag is set if the .gitmodules file is unmerged. We then * disable recursion for all submodules where .git/config doesn't have a * matching config entry because we can't guess what might be configured in * .gitmodules unless the user resolves the conflict. When a command line * option is given (which always overrides configuration) this flag will be * ignored. */ 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_gently(".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(§, "submodule."); strbuf_addstr(§, 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(§); return -1; } strbuf_release(§); 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; int ret = 0; ret = strbuf_git_path_submodule(&objects_directory, path, "objects/"); if (ret) goto done; if (!is_directory(objects_directory.buf)) { ret = -1; goto done; } add_to_alternates_memory(objects_directory.buf); done: strbuf_release(&objects_directory); return ret; } void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt, const char *path) { 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); } } int submodule_config(const char *var, const char *value, void *cb) { if (!strcmp(var, "submodule.fetchjobs")) { parallel_jobs = git_config_int(var, value); if (parallel_jobs < 0) die(_("negative values not allowed for submodule.fetchJobs")); return 0; } else 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); return 0; } return 0; } void gitmodules_config(void) { const char *work_tree = get_git_work_tree(); if (work_tree) { struct strbuf gitmodules_path = STRBUF_INIT; int pos; strbuf_addstr(&gitmodules_path, work_tree); strbuf_addstr(&gitmodules_path, "/.gitmodules"); if (read_cache() < 0) die("index file corrupt"); pos = cache_name_pos(".gitmodules", 11); if (pos < 0) { /* .gitmodules not found or isn't merged */ pos = -1 - pos; if (active_nr > pos) { /* there is a .gitmodules */ const struct cache_entry *ce = active_cache[pos]; if (ce_namelen(ce) == 11 && !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) git_config_from_file(submodule_config, gitmodules_path.buf, NULL); strbuf_release(&gitmodules_path); } } void gitmodules_config_sha1(const unsigned char *commit_sha1) { struct strbuf rev = STRBUF_INIT; unsigned char sha1[20]; if (gitmodule_sha1_from_commit(commit_sha1, sha1, &rev)) { git_config_from_blob_sha1(submodule_config, rev.buf, sha1, NULL); } strbuf_release(&rev); } /* * NEEDSWORK: With the addition of different configuration options to determine * if a submodule is of interests, the validity of this function's name comes * into question. Once the dust has settled and more concrete terminology is * decided upon, come up with a more proper name for this function. One * potential candidate could be 'is_submodule_active()'. * * Determine if a submodule has been initialized at a given 'path' */ int is_submodule_initialized(const char *path) { int ret = 0; char *key = NULL; char *value = NULL; const struct string_list *sl; const struct submodule *module = submodule_from_path(null_sha1, path); /* early return if there isn't a path->module mapping */ if (!module) return 0; /* submodule.<name>.active is set */ key = xstrfmt("submodule.%s.active", module->name); if (!git_config_get_bool(key, &ret)) { free(key); return ret; } free(key); /* submodule.active is set */ sl = git_config_get_value_multi("submodule.active"); if (sl) { struct pathspec ps; struct argv_array args = ARGV_ARRAY_INIT; const struct string_list_item *item; for_each_string_list_item(item, sl) { argv_array_push(&args, item->string); } parse_pathspec(&ps, 0, 0, NULL, args.argv); ret = match_pathspec(&ps, path, strlen(path), 0, NULL, 1); argv_array_clear(&args); clear_pathspec(&ps); return ret; } /* fallback to checking if the URL is set */ key = xstrfmt("submodule.%s.url", module->name); ret = !git_config_get_string(key, &value); free(value); free(key); return ret; } int is_submodule_populated_gently(const char *path, int *return_error_code) { int ret = 0; char *gitdir = xstrfmt("%s/.git", path); if (resolve_gitdir_gently(gitdir, return_error_code)) ret = 1; free(gitdir); return ret; } int parse_submodule_update_strategy(const char *value, struct submodule_update_strategy *dst) { free((void*)dst->command); dst->command = NULL; if (!strcmp(value, "none")) dst->type = SM_UPDATE_NONE; else if (!strcmp(value, "checkout")) dst->type = SM_UPDATE_CHECKOUT; else if (!strcmp(value, "rebase")) dst->type = SM_UPDATE_REBASE; else if (!strcmp(value, "merge")) dst->type = SM_UPDATE_MERGE; else if (skip_prefix(value, "!", &value)) { dst->type = SM_UPDATE_COMMAND; dst->command = xstrdup(value); } else return -1; return 0; } const char *submodule_strategy_to_string(const struct submodule_update_strategy *s) { struct strbuf sb = STRBUF_INIT; switch (s->type) { case SM_UPDATE_CHECKOUT: return "checkout"; case SM_UPDATE_MERGE: return "merge"; case SM_UPDATE_REBASE: return "rebase"; case SM_UPDATE_NONE: return "none"; case SM_UPDATE_UNSPECIFIED: return NULL; case SM_UPDATE_COMMAND: strbuf_addf(&sb, "!%s", s->command); return strbuf_detach(&sb, NULL); } return NULL; } void handle_ignore_submodules_arg(struct diff_options *diffopt, const char *arg) { DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES); DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES); DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES); if (!strcmp(arg, "all")) DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES); else if (!strcmp(arg, "untracked")) DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES); else if (!strcmp(arg, "dirty")) DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES); else if (strcmp(arg, "none")) die("bad --ignore-submodules argument: %s", arg); } static int prepare_submodule_summary(struct rev_info *rev, const char *path, struct commit *left, struct commit *right, struct commit_list *merge_bases) { struct commit_list *list; init_revisions(rev, NULL); setup_revisions(0, NULL, rev, NULL); rev->left_right = 1; rev->first_parent_only = 1; left->object.flags |= SYMMETRIC_LEFT; add_pending_object(rev, &left->object, path); add_pending_object(rev, &right->object, path); for (list = merge_bases; list; list = list->next) { list->item->object.flags |= UNINTERESTING; add_pending_object(rev, &list->item->object, oid_to_hex(&list->item->object.oid)); } return prepare_revision_walk(rev); } 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"; struct strbuf sb = STRBUF_INIT; struct commit *commit; 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); } else if (add) strbuf_addstr(&sb, add); format_commit_message(commit, format, &sb, &ctx); if (reset) strbuf_addstr(&sb, reset); strbuf_addch(&sb, '\n'); fprintf(f, "%s", sb.buf); } strbuf_release(&sb); } static void prepare_submodule_repo_env_no_git_dir(struct argv_array *out) { const char * const *var; for (var = local_repo_env; *var; var++) { if (strcmp(*var, CONFIG_DATA_ENVIRONMENT)) argv_array_push(out, *var); } } void prepare_submodule_repo_env(struct argv_array *out) { prepare_submodule_repo_env_no_git_dir(out); argv_array_pushf(out, "%s=%s", GIT_DIR_ENVIRONMENT, DEFAULT_GIT_DIR_ENVIRONMENT); } /* Helper function to display the submodule header line prior to the full * summary output. If it can locate the submodule objects directory it will * attempt to lookup both the left and right commits and put them into the * left and right pointers. */ static void show_submodule_header(FILE *f, const char *path, const char *line_prefix, struct object_id *one, struct object_id *two, unsigned dirty_submodule, const char *meta, const char *reset, struct commit **left, struct commit **right, struct commit_list **merge_bases) { const char *message = NULL; struct strbuf sb = STRBUF_INIT; int fast_forward = 0, fast_backward = 0; if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) fprintf(f, "%sSubmodule %s contains untracked content\n", line_prefix, path); if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED) fprintf(f, "%sSubmodule %s contains modified content\n", line_prefix, path); if (is_null_oid(one)) message = "(new submodule)"; else if (is_null_oid(two)) message = "(submodule deleted)"; if (add_submodule_odb(path)) { if (!message) message = "(not initialized)"; goto output_header; } /* * Attempt to lookup the commit references, and determine if this is * a fast forward or fast backwards update. */ *left = lookup_commit_reference(one->hash); *right = lookup_commit_reference(two->hash); /* * Warn about missing commits in the submodule project, but only if * they aren't null. */ if ((!is_null_oid(one) && !*left) || (!is_null_oid(two) && !*right)) message = "(commits not present)"; *merge_bases = get_merge_bases(*left, *right); if (*merge_bases) { if ((*merge_bases)->item == *left) fast_forward = 1; else if ((*merge_bases)->item == *right) fast_backward = 1; } if (!oidcmp(one, two)) { strbuf_release(&sb); return; } output_header: strbuf_addf(&sb, "%s%sSubmodule %s ", line_prefix, meta, path); strbuf_add_unique_abbrev(&sb, one->hash, DEFAULT_ABBREV); strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "..."); strbuf_add_unique_abbrev(&sb, two->hash, DEFAULT_ABBREV); if (message) strbuf_addf(&sb, " %s%s\n", message, reset); else strbuf_addf(&sb, "%s:%s\n", fast_backward ? " (rewind)" : "", reset); fwrite(sb.buf, sb.len, 1, f); strbuf_release(&sb); } void show_submodule_summary(FILE *f, const char *path, const char *line_prefix, struct object_id *one, struct object_id *two, unsigned dirty_submodule, const char *meta, const char *del, const char *add, const char *reset) { struct rev_info rev; struct commit *left = NULL, *right = NULL; struct commit_list *merge_bases = NULL; show_submodule_header(f, path, line_prefix, one, two, dirty_submodule, meta, reset, &left, &right, &merge_bases); /* * If we don't have both a left and a right pointer, there is no * reason to try and display a summary. The header line should contain * all the information the user needs. */ if (!left || !right) goto out; /* Treat revision walker failure the same as missing commits */ if (prepare_submodule_summary(&rev, path, left, right, merge_bases)) { fprintf(f, "%s(revision walker failed)\n", line_prefix); goto out; } print_submodule_summary(&rev, f, line_prefix, del, add, reset); out: if (merge_bases) free_commit_list(merge_bases); clear_commit_marks(left, ~0); clear_commit_marks(right, ~0); } void show_submodule_inline_diff(FILE *f, const char *path, const char *line_prefix, struct object_id *one, struct object_id *two, unsigned dirty_submodule, const char *meta, const char *del, const char *add, const char *reset, const struct diff_options *o) { const struct object_id *old = &empty_tree_oid, *new = &empty_tree_oid; struct commit *left = NULL, *right = NULL; struct commit_list *merge_bases = NULL; struct strbuf submodule_dir = STRBUF_INIT; struct child_process cp = CHILD_PROCESS_INIT; show_submodule_header(f, path, line_prefix, one, two, dirty_submodule, meta, reset, &left, &right, &merge_bases); /* We need a valid left and right commit to display a difference */ if (!(left || is_null_oid(one)) || !(right || is_null_oid(two))) goto done; if (left) old = one; if (right) new = two; fflush(f); cp.git_cmd = 1; cp.dir = path; cp.out = dup(fileno(f)); cp.no_stdin = 1; /* TODO: other options may need to be passed here. */ argv_array_push(&cp.args, "diff"); argv_array_pushf(&cp.args, "--line-prefix=%s", line_prefix); if (DIFF_OPT_TST(o, REVERSE_DIFF)) { argv_array_pushf(&cp.args, "--src-prefix=%s%s/", o->b_prefix, path); argv_array_pushf(&cp.args, "--dst-prefix=%s%s/", o->a_prefix, path); } else { argv_array_pushf(&cp.args, "--src-prefix=%s%s/", o->a_prefix, path); argv_array_pushf(&cp.args, "--dst-prefix=%s%s/", o->b_prefix, path); } argv_array_push(&cp.args, oid_to_hex(old)); /* * If the submodule has modified content, we will diff against the * work tree, under the assumption that the user has asked for the * diff format and wishes to actually see all differences even if they * haven't yet been committed to the submodule yet. */ if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED)) argv_array_push(&cp.args, oid_to_hex(new)); if (run_command(&cp)) fprintf(f, "(diff failed)\n"); done: strbuf_release(&submodule_dir); if (merge_bases) free_commit_list(merge_bases); if (left) clear_commit_marks(left, ~0); if (right) clear_commit_marks(right, ~0); } void set_config_fetch_recurse_submodules(int value) { config_fetch_recurse_submodules = value; } void set_config_update_recurse_submodules(int value) { config_update_recurse_submodules = value; } int should_update_submodules(void) { return config_update_recurse_submodules == RECURSE_SUBMODULES_ON; } const struct submodule *submodule_from_ce(const struct cache_entry *ce) { if (!S_ISGITLINK(ce->ce_mode)) return NULL; if (!should_update_submodules()) return NULL; return submodule_from_path(null_sha1, ce->name); } static int has_remote(const char *refname, const struct object_id *oid, int flags, void *cb_data) { return 1; } static int append_sha1_to_argv(const unsigned char sha1[20], void *data) { struct argv_array *argv = data; argv_array_push(argv, sha1_to_hex(sha1)); return 0; } static int check_has_commit(const unsigned char sha1[20], void *data) { int *has_commit = data; if (!lookup_commit_reference(sha1)) *has_commit = 0; return 0; } static int submodule_has_commits(const char *path, struct sha1_array *commits) { int has_commit = 1; if (add_submodule_odb(path)) return 0; sha1_array_for_each_unique(commits, check_has_commit, &has_commit); return has_commit; } static int submodule_needs_pushing(const char *path, struct sha1_array *commits) { if (!submodule_has_commits(path, commits)) /* * NOTE: We do consider it safe to return "no" here. The * correct answer would be "We do not know" instead of * "No push needed", but it is quite hard to change * the submodule pointer without having the submodule * around. If a user did however change the submodules * without having the submodule around, this indicates * an expert who knows what they are doing or a * maintainer integrating work from other people. In * both cases it should be safe to skip this check. */ return 0; if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) { struct child_process cp = CHILD_PROCESS_INIT; struct strbuf buf = STRBUF_INIT; int needs_pushing = 0; argv_array_push(&cp.args, "rev-list"); sha1_array_for_each_unique(commits, append_sha1_to_argv, &cp.args); argv_array_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL); prepare_submodule_repo_env(&cp.env_array); cp.git_cmd = 1; cp.no_stdin = 1; cp.out = -1; cp.dir = path; if (start_command(&cp)) die("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s", path); if (strbuf_read(&buf, cp.out, 41)) needs_pushing = 1; finish_command(&cp); close(cp.out); strbuf_release(&buf); return needs_pushing; } return 0; } static struct sha1_array *submodule_commits(struct string_list *submodules, const char *path) { struct string_list_item *item; item = string_list_insert(submodules, path); if (item->util) return (struct sha1_array *) item->util; /* NEEDSWORK: should we have sha1_array_init()? */ item->util = xcalloc(1, sizeof(struct sha1_array)); return (struct sha1_array *) item->util; } static void collect_submodules_from_diff(struct diff_queue_struct *q, struct diff_options *options, void *data) { int i; struct string_list *submodules = data; for (i = 0; i < q->nr; i++) { struct diff_filepair *p = q->queue[i]; struct sha1_array *commits; if (!S_ISGITLINK(p->two->mode)) continue; commits = submodule_commits(submodules, p->two->path); sha1_array_append(commits, p->two->oid.hash); } } static void find_unpushed_submodule_commits(struct commit *commit, struct string_list *needs_pushing) { struct rev_info rev; init_revisions(&rev, NULL); rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK; rev.diffopt.format_callback = collect_submodules_from_diff; rev.diffopt.format_callback_data = needs_pushing; diff_tree_combined_merge(commit, 1, &rev); } static void free_submodules_sha1s(struct string_list *submodules) { struct string_list_item *item; for_each_string_list_item(item, submodules) sha1_array_clear((struct sha1_array *) item->util); string_list_clear(submodules, 1); } int find_unpushed_submodules(struct sha1_array *commits, const char *remotes_name, struct string_list *needs_pushing) { struct rev_info rev; struct commit *commit; struct string_list submodules = STRING_LIST_INIT_DUP; struct string_list_item *submodule; struct argv_array argv = ARGV_ARRAY_INIT; init_revisions(&rev, NULL); /* argv.argv[0] will be ignored by setup_revisions */ argv_array_push(&argv, "find_unpushed_submodules"); sha1_array_for_each_unique(commits, append_sha1_to_argv, &argv); argv_array_push(&argv, "--not"); argv_array_pushf(&argv, "--remotes=%s", remotes_name); setup_revisions(argv.argc, argv.argv, &rev, NULL); if (prepare_revision_walk(&rev)) die("revision walk setup failed"); while ((commit = get_revision(&rev)) != NULL) find_unpushed_submodule_commits(commit, &submodules); reset_revision_walk(); argv_array_clear(&argv); for_each_string_list_item(submodule, &submodules) { struct sha1_array *commits = (struct sha1_array *) submodule->util; if (submodule_needs_pushing(submodule->string, commits)) string_list_insert(needs_pushing, submodule->string); } free_submodules_sha1s(&submodules); return needs_pushing->nr; } static int push_submodule(const char *path, int dry_run) { 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; argv_array_push(&cp.args, "push"); if (dry_run) argv_array_push(&cp.args, "--dry-run"); prepare_submodule_repo_env(&cp.env_array); 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(struct sha1_array *commits, const char *remotes_name, int dry_run) { int i, ret = 1; struct string_list needs_pushing = STRING_LIST_INIT_DUP; if (!find_unpushed_submodules(commits, 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, dry_run)) { 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]) { int is_present = 0; 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 = 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); cp.argv = argv; prepare_submodule_repo_env(&cp.env_array); cp.git_cmd = 1; cp.no_stdin = 1; cp.dir = path; if (!capture_command(&cp, &buf, 1024) && !buf.len) is_present = 1; strbuf_release(&buf); } return is_present; } static void submodule_collect_changed_cb(struct diff_queue_struct *q, struct diff_options *options, void *data) { int i; for (i = 0; i < q->nr; i++) { struct diff_filepair *p = q->queue[i]; if (!S_ISGITLINK(p->two->mode)) continue; if (S_ISGITLINK(p->one->mode)) { /* NEEDSWORK: We should honor the name configured in * the .gitmodules file of the commit we are examining * here to be able to correctly follow submodules * being moved around. */ struct string_list_item *path; path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path); if (!path && !is_submodule_commit_present(p->two->path, p->two->oid.hash)) string_list_append(&changed_submodule_paths, xstrdup(p->two->path)); } else { /* Submodule is new or was moved here */ /* NEEDSWORK: When the .git directories of submodules * live inside the superprojects .git directory some * day we should fetch new submodules directly into * that location too when config or options request * that so they can be checked out from there. */ continue; } } } static int add_sha1_to_array(const char *ref, const struct object_id *oid, int flags, void *data) { sha1_array_append(data, oid->hash); return 0; } void check_for_new_submodule_commits(unsigned char new_sha1[20]) { if (!initialized_fetch_ref_tips) { for_each_ref(add_sha1_to_array, &ref_tips_before_fetch); initialized_fetch_ref_tips = 1; } sha1_array_append(&ref_tips_after_fetch, new_sha1); } static int add_sha1_to_argv(const unsigned char sha1[20], void *data) { argv_array_push(data, sha1_to_hex(sha1)); return 0; } static void calculate_changed_submodule_paths(void) { struct rev_info rev; struct commit *commit; struct argv_array argv = ARGV_ARRAY_INIT; /* No need to check if there are no submodules configured */ if (!submodule_from_path(NULL, NULL)) return; init_revisions(&rev, NULL); argv_array_push(&argv, "--"); /* argv[0] program name */ sha1_array_for_each_unique(&ref_tips_after_fetch, add_sha1_to_argv, &argv); argv_array_push(&argv, "--not"); sha1_array_for_each_unique(&ref_tips_before_fetch, add_sha1_to_argv, &argv); setup_revisions(argv.argc, argv.argv, &rev, NULL); if (prepare_revision_walk(&rev)) die("revision walk setup failed"); /* * Collect all submodules (whether checked out or not) for which new * commits have been recorded upstream in "changed_submodule_paths". */ while ((commit = get_revision(&rev))) { struct commit_list *parent = commit->parents; while (parent) { struct diff_options diff_opts; diff_setup(&diff_opts); DIFF_OPT_SET(&diff_opts, RECURSIVE); diff_opts.output_format |= DIFF_FORMAT_CALLBACK; diff_opts.format_callback = submodule_collect_changed_cb; diff_setup_done(&diff_opts); diff_tree_sha1(parent->item->object.oid.hash, commit->object.oid.hash, "", &diff_opts); diffcore_std(&diff_opts); diff_flush(&diff_opts); parent = parent->next; } } argv_array_clear(&argv); sha1_array_clear(&ref_tips_before_fetch); sha1_array_clear(&ref_tips_after_fetch); initialized_fetch_ref_tips = 0; } struct submodule_parallel_fetch { int count; struct argv_array args; const char *work_tree; const char *prefix; int command_line_option; int quiet; int result; }; #define SPF_INIT {0, ARGV_ARRAY_INIT, NULL, NULL, 0, 0, 0} static int get_next_submodule(struct child_process *cp, struct strbuf *err, void *data, void **task_cb) { int ret = 0; struct submodule_parallel_fetch *spf = data; for (; spf->count < active_nr; spf->count++) { struct strbuf submodule_path = STRBUF_INIT; struct strbuf submodule_git_dir = STRBUF_INIT; struct strbuf submodule_prefix = STRBUF_INIT; const struct cache_entry *ce = active_cache[spf->count]; const char *git_dir, *default_argv; const struct submodule *submodule; if (!S_ISGITLINK(ce->ce_mode)) continue; submodule = submodule_from_path(null_sha1, ce->name); if (!submodule) submodule = submodule_from_name(null_sha1, ce->name); default_argv = "yes"; if (spf->command_line_option == RECURSE_SUBMODULES_DEFAULT) { if (submodule && submodule->fetch_recurse != RECURSE_SUBMODULES_NONE) { if (submodule->fetch_recurse == RECURSE_SUBMODULES_OFF) continue; if (submodule->fetch_recurse == RECURSE_SUBMODULES_ON_DEMAND) { if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name)) continue; default_argv = "on-demand"; } } else { if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) || gitmodules_is_unmerged) continue; if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) { if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name)) continue; default_argv = "on-demand"; } } } else if (spf->command_line_option == RECURSE_SUBMODULES_ON_DEMAND) { if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name)) continue; default_argv = "on-demand"; } strbuf_addf(&submodule_path, "%s/%s", spf->work_tree, ce->name); strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf); strbuf_addf(&submodule_prefix, "%s%s/", spf->prefix, ce->name); git_dir = read_gitfile(submodule_git_dir.buf); if (!git_dir) git_dir = submodule_git_dir.buf; if (is_directory(git_dir)) { child_process_init(cp); cp->dir = strbuf_detach(&submodule_path, NULL); prepare_submodule_repo_env(&cp->env_array); cp->git_cmd = 1; if (!spf->quiet) strbuf_addf(err, "Fetching submodule %s%s\n", spf->prefix, ce->name); argv_array_init(&cp->args); argv_array_pushv(&cp->args, spf->args.argv); argv_array_push(&cp->args, default_argv); argv_array_push(&cp->args, "--submodule-prefix"); argv_array_push(&cp->args, submodule_prefix.buf); ret = 1; } strbuf_release(&submodule_path); strbuf_release(&submodule_git_dir); strbuf_release(&submodule_prefix); if (ret) { spf->count++; return 1; } } return 0; } static int fetch_start_failure(struct strbuf *err, void *cb, void *task_cb) { struct submodule_parallel_fetch *spf = cb; spf->result = 1; return 0; } static int fetch_finish(int retvalue, struct strbuf *err, void *cb, void *task_cb) { struct submodule_parallel_fetch *spf = cb; if (retvalue) spf->result = 1; return 0; } int fetch_populated_submodules(const struct argv_array *options, const char *prefix, int command_line_option, int quiet, int max_parallel_jobs) { int i; struct submodule_parallel_fetch spf = SPF_INIT; spf.work_tree = get_git_work_tree(); spf.command_line_option = command_line_option; spf.quiet = quiet; spf.prefix = prefix; if (!spf.work_tree) goto out; if (read_cache() < 0) die("index file corrupt"); argv_array_push(&spf.args, "fetch"); for (i = 0; i < options->argc; i++) argv_array_push(&spf.args, options->argv[i]); argv_array_push(&spf.args, "--recurse-submodules-default"); /* default value, "--submodule-prefix" and its value are added later */ if (max_parallel_jobs < 0) max_parallel_jobs = parallel_jobs; calculate_changed_submodule_paths(); run_processes_parallel(max_parallel_jobs, get_next_submodule, fetch_start_failure, fetch_finish, &spf); argv_array_clear(&spf.args); out: string_list_clear(&changed_submodule_paths, 1); return spf.result; } unsigned is_submodule_modified(const char *path, int ignore_untracked) { ssize_t len; struct child_process cp = CHILD_PROCESS_INIT; const char *argv[] = { "status", "--porcelain", NULL, NULL, }; struct strbuf buf = STRBUF_INIT; unsigned dirty_submodule = 0; const char *line, *next_line; const char *git_dir; strbuf_addf(&buf, "%s/.git", path); git_dir = read_gitfile(buf.buf); if (!git_dir) git_dir = buf.buf; if (!is_directory(git_dir)) { strbuf_release(&buf); /* The submodule is not checked out, so it is not modified */ return 0; } strbuf_reset(&buf); if (ignore_untracked) argv[2] = "-uno"; cp.argv = argv; prepare_submodule_repo_env(&cp.env_array); 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' in submodule %s", path); len = strbuf_read(&buf, cp.out, 1024); line = buf.buf; while (len > 2) { if ((line[0] == '?') && (line[1] == '?')) { dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED; if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED) break; } else { dirty_submodule |= DIRTY_SUBMODULE_MODIFIED; if (ignore_untracked || (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)) break; } next_line = strchr(line, '\n'); if (!next_line) break; next_line++; len -= (next_line - line); line = next_line; } close(cp.out); if (finish_command(&cp)) die("'git status --porcelain' failed in submodule %s", path); strbuf_release(&buf); 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; prepare_submodule_repo_env(&cp.env_array); 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; } /* * Check if it is a bad idea to remove a submodule, i.e. if we'd lose data * when doing so. * * Return 1 if we'd lose data, return 0 if the removal is fine, * and negative values for errors. */ int bad_to_remove_submodule(const char *path, unsigned flags) { ssize_t len; struct child_process cp = CHILD_PROCESS_INIT; struct strbuf buf = STRBUF_INIT; int ret = 0; if (!file_exists(path) || is_empty_dir(path)) return 0; if (!submodule_uses_gitfile(path)) return 1; argv_array_pushl(&cp.args, "status", "--porcelain", "--ignore-submodules=none", NULL); if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED) argv_array_push(&cp.args, "-uno"); else argv_array_push(&cp.args, "-uall"); if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED)) argv_array_push(&cp.args, "--ignored"); prepare_submodule_repo_env(&cp.env_array); cp.git_cmd = 1; cp.no_stdin = 1; cp.out = -1; cp.dir = path; if (start_command(&cp)) { if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR) die(_("could not start 'git status in submodule '%s'"), path); ret = -1; goto out; } len = strbuf_read(&buf, cp.out, 1024); if (len > 2) ret = 1; close(cp.out); if (finish_command(&cp)) { if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR) die(_("could not run 'git status in submodule '%s'"), path); ret = -1; } out: strbuf_release(&buf); return ret; } static const char *get_super_prefix_or_empty(void) { const char *s = get_super_prefix(); if (!s) s = ""; return s; } static int submodule_has_dirty_index(const struct submodule *sub) { struct child_process cp = CHILD_PROCESS_INIT; prepare_submodule_repo_env_no_git_dir(&cp.env_array); cp.git_cmd = 1; argv_array_pushl(&cp.args, "diff-index", "--quiet", "--cached", "HEAD", NULL); cp.no_stdin = 1; cp.no_stdout = 1; cp.dir = sub->path; if (start_command(&cp)) die("could not recurse into submodule '%s'", sub->path); return finish_command(&cp); } static void submodule_reset_index(const char *path) { struct child_process cp = CHILD_PROCESS_INIT; prepare_submodule_repo_env_no_git_dir(&cp.env_array); cp.git_cmd = 1; cp.no_stdin = 1; cp.dir = path; argv_array_pushf(&cp.args, "--super-prefix=%s%s/", get_super_prefix_or_empty(), path); argv_array_pushl(&cp.args, "read-tree", "-u", "--reset", NULL); argv_array_push(&cp.args, EMPTY_TREE_SHA1_HEX); if (run_command(&cp)) die("could not reset submodule index"); } /** * Moves a submodule at a given path from a given head to another new head. * For edge cases (a submodule coming into existence or removing a submodule) * pass NULL for old or new respectively. */ int submodule_move_head(const char *path, const char *old, const char *new, unsigned flags) { int ret = 0; struct child_process cp = CHILD_PROCESS_INIT; const struct submodule *sub; sub = submodule_from_path(null_sha1, path); if (!sub) die("BUG: could not get submodule information for '%s'", path); if (old && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) { /* Check if the submodule has a dirty index. */ if (submodule_has_dirty_index(sub)) return error(_("submodule '%s' has dirty index"), path); } if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) { if (old) { if (!submodule_uses_gitfile(path)) absorb_git_dir_into_superproject("", path, ABSORB_GITDIR_RECURSE_SUBMODULES); } else { struct strbuf sb = STRBUF_INIT; strbuf_addf(&sb, "%s/modules/%s", get_git_common_dir(), sub->name); connect_work_tree_and_git_dir(path, sb.buf); strbuf_release(&sb); /* make sure the index is clean as well */ submodule_reset_index(path); } } prepare_submodule_repo_env_no_git_dir(&cp.env_array); cp.git_cmd = 1; cp.no_stdin = 1; cp.dir = path; argv_array_pushf(&cp.args, "--super-prefix=%s%s/", get_super_prefix_or_empty(), path); argv_array_pushl(&cp.args, "read-tree", NULL); if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN) argv_array_push(&cp.args, "-n"); else argv_array_push(&cp.args, "-u"); if (flags & SUBMODULE_MOVE_HEAD_FORCE) argv_array_push(&cp.args, "--reset"); else argv_array_push(&cp.args, "-m"); argv_array_push(&cp.args, old ? old : EMPTY_TREE_SHA1_HEX); argv_array_push(&cp.args, new ? new : EMPTY_TREE_SHA1_HEX); if (run_command(&cp)) { ret = -1; goto out; } if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) { if (new) { struct child_process cp1 = CHILD_PROCESS_INIT; /* also set the HEAD accordingly */ cp1.git_cmd = 1; cp1.no_stdin = 1; cp1.dir = path; argv_array_pushl(&cp1.args, "update-ref", "HEAD", new ? new : EMPTY_TREE_SHA1_HEX, NULL); if (run_command(&cp1)) { ret = -1; goto out; } } else { struct strbuf sb = STRBUF_INIT; strbuf_addf(&sb, "%s/.git", path); unlink_or_warn(sb.buf); strbuf_release(&sb); if (is_empty_dir(path)) rmdir_or_warn(path); } } out: return ret; } 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 = OBJECT_ARRAY_INIT; struct commit *commit; int contains_another; char merged_revision[42]; const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path", "--all", merged_revision, NULL }; struct rev_info revs; struct setup_revision_opt rev_opts; memset(result, 0, sizeof(struct object_array)); memset(&rev_opts, 0, sizeof(rev_opts)); /* get all revisions that merge commit a */ xsnprintf(merged_revision, sizeof(merged_revision), "^%s", oid_to_hex(&a->object.oid)); init_revisions(&revs, NULL); rev_opts.submodule = path; 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)) 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 * result. */ for (i = 0; i < merges.nr; i++) { struct commit *m1 = (struct commit *) merges.objects[i].item; 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)) { contains_another = 1; break; } } if (!contains_another) add_object_array(merges.objects[i].item, NULL, result); } free(merges.objects); return result->nr; } static void print_commit(struct commit *commit) { struct strbuf sb = STRBUF_INIT; struct pretty_print_context ctx = {0}; ctx.date_mode.type = DATE_NORMAL; format_commit_message(commit, " %h: %m %s", &sb, &ctx); fprintf(stderr, "%s\n", sb.buf); strbuf_release(&sb); } #define MERGE_WARNING(path, msg) \ warning("Failed to merge submodule %s (%s)", path, msg); int merge_submodule(unsigned char result[20], const char *path, const unsigned char base[20], const unsigned char a[20], const unsigned char b[20], int search) { struct commit *commit_base, *commit_a, *commit_b; int parent_count; struct object_array merges; int i; /* store a in result in case we fail */ hashcpy(result, a); /* we can not handle deletion conflicts */ if (is_null_sha1(base)) return 0; if (is_null_sha1(a)) return 0; if (is_null_sha1(b)) return 0; if (add_submodule_odb(path)) { MERGE_WARNING(path, "not checked out"); return 0; } if (!(commit_base = lookup_commit_reference(base)) || !(commit_a = lookup_commit_reference(a)) || !(commit_b = lookup_commit_reference(b))) { MERGE_WARNING(path, "commits not present"); return 0; } /* check whether both changes are forward */ 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)) { hashcpy(result, b); return 1; } if (in_merge_bases(commit_b, commit_a)) { hashcpy(result, a); return 1; } /* * Case #2: There are one or more merges that contain a and b in * the submodule. If there is only one, then present it as a * suggestion to the user, but leave it marked unmerged so the * user needs to confirm the resolution. */ /* Skip the search if makes no sense to the calling context. */ if (!search) return 0; /* find commit which merges them */ parent_count = find_first_merges(&merges, path, commit_a, commit_b); switch (parent_count) { case 0: MERGE_WARNING(path, "merge following commits not found"); break; case 1: MERGE_WARNING(path, "not fast-forward"); fprintf(stderr, "Found a possible merge resolution " "for the submodule:\n"); print_commit((struct commit *) merges.objects[0].item); fprintf(stderr, "If this is correct simply add it to the index " "for example\n" "by using:\n\n" " git update-index --cacheinfo 160000 %s \"%s\"\n\n" "which will accept this suggestion.\n", oid_to_hex(&merges.objects[0].item->oid), path); break; default: MERGE_WARNING(path, "multiple merges found"); for (i = 0; i < merges.nr; i++) print_commit((struct commit *) merges.objects[i].item); } free(merges.objects); return 0; } int parallel_submodules(void) { return parallel_jobs; } /* * Embeds a single submodules git directory into the superprojects git dir, * non recursively. */ static void relocate_single_git_dir_into_superproject(const char *prefix, const char *path) { char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL; const char *new_git_dir; const struct submodule *sub; if (submodule_uses_worktrees(path)) die(_("relocate_gitdir for submodule '%s' with " "more than one worktree not supported"), path); old_git_dir = xstrfmt("%s/.git", path); if (read_gitfile(old_git_dir)) /* If it is an actual gitfile, it doesn't need migration. */ return; real_old_git_dir = real_pathdup(old_git_dir, 1); sub = submodule_from_path(null_sha1, path); if (!sub) die(_("could not lookup name for submodule '%s'"), path); new_git_dir = git_path("modules/%s", sub->name); if (safe_create_leading_directories_const(new_git_dir) < 0) die(_("could not create directory '%s'"), new_git_dir); real_new_git_dir = real_pathdup(new_git_dir, 1); fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"), get_super_prefix_or_empty(), path, real_old_git_dir, real_new_git_dir); relocate_gitdir(path, real_old_git_dir, real_new_git_dir); free(old_git_dir); free(real_old_git_dir); free(real_new_git_dir); } /* * Migrate the git directory of the submodule given by path from * having its git directory within the working tree to the git dir nested * in its superprojects git dir under modules/. */ void absorb_git_dir_into_superproject(const char *prefix, const char *path, unsigned flags) { int err_code; const char *sub_git_dir; struct strbuf gitdir = STRBUF_INIT; strbuf_addf(&gitdir, "%s/.git", path); sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code); /* Not populated? */ if (!sub_git_dir) { const struct submodule *sub; if (err_code == READ_GITFILE_ERR_STAT_FAILED) { /* unpopulated as expected */ strbuf_release(&gitdir); return; } if (err_code != READ_GITFILE_ERR_NOT_A_REPO) /* We don't know what broke here. */ read_gitfile_error_die(err_code, path, NULL); /* * Maybe populated, but no git directory was found? * This can happen if the superproject is a submodule * itself and was just absorbed. The absorption of the * superproject did not rewrite the git file links yet, * fix it now. */ sub = submodule_from_path(null_sha1, path); if (!sub) die(_("could not lookup name for submodule '%s'"), path); connect_work_tree_and_git_dir(path, git_path("modules/%s", sub->name)); } else { /* Is it already absorbed into the superprojects git dir? */ char *real_sub_git_dir = real_pathdup(sub_git_dir, 1); char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1); if (!starts_with(real_sub_git_dir, real_common_git_dir)) relocate_single_git_dir_into_superproject(prefix, path); free(real_sub_git_dir); free(real_common_git_dir); } strbuf_release(&gitdir); if (flags & ABSORB_GITDIR_RECURSE_SUBMODULES) { struct child_process cp = CHILD_PROCESS_INIT; struct strbuf sb = STRBUF_INIT; if (flags & ~ABSORB_GITDIR_RECURSE_SUBMODULES) die("BUG: we don't know how to pass the flags down?"); strbuf_addstr(&sb, get_super_prefix_or_empty()); strbuf_addstr(&sb, path); strbuf_addch(&sb, '/'); cp.dir = path; cp.git_cmd = 1; cp.no_stdin = 1; argv_array_pushl(&cp.args, "--super-prefix", sb.buf, "submodule--helper", "absorb-git-dirs", NULL); prepare_submodule_repo_env(&cp.env_array); if (run_command(&cp)) die(_("could not recurse into submodule '%s'"), path); strbuf_release(&sb); } } const char *get_superproject_working_tree(void) { struct child_process cp = CHILD_PROCESS_INIT; struct strbuf sb = STRBUF_INIT; const char *one_up = real_path_if_valid("../"); const char *cwd = xgetcwd(); const char *ret = NULL; const char *subpath; int code; ssize_t len; if (!is_inside_work_tree()) /* * FIXME: * We might have a superproject, but it is harder * to determine. */ return NULL; if (!one_up) return NULL; subpath = relative_path(cwd, one_up, &sb); prepare_submodule_repo_env(&cp.env_array); argv_array_pop(&cp.env_array); argv_array_pushl(&cp.args, "--literal-pathspecs", "-C", "..", "ls-files", "-z", "--stage", "--full-name", "--", subpath, NULL); strbuf_reset(&sb); cp.no_stdin = 1; cp.no_stderr = 1; cp.out = -1; cp.git_cmd = 1; if (start_command(&cp)) die(_("could not start ls-files in ..")); len = strbuf_read(&sb, cp.out, PATH_MAX); close(cp.out); if (starts_with(sb.buf, "160000")) { int super_sub_len; int cwd_len = strlen(cwd); char *super_sub, *super_wt; /* * There is a superproject having this repo as a submodule. * The format is <mode> SP <hash> SP <stage> TAB <full name> \0, * We're only interested in the name after the tab. */ super_sub = strchr(sb.buf, '\t') + 1; super_sub_len = sb.buf + sb.len - super_sub - 1; if (super_sub_len > cwd_len || strcmp(&cwd[cwd_len - super_sub_len], super_sub)) die (_("BUG: returned path string doesn't match cwd?")); super_wt = xstrdup(cwd); super_wt[cwd_len - super_sub_len] = '\0'; ret = real_path(super_wt); free(super_wt); } strbuf_release(&sb); code = finish_command(&cp); if (code == 128) /* '../' is not a git repository */ return NULL; if (code == 0 && len == 0) /* There is an unrelated git repository at '../' */ return NULL; if (code) die(_("ls-tree returned unexpected return code %d"), code); return ret; }