#include "cache.h" #include "argv-array.h" #include "repository.h" #include "config.h" #include "dir.h" #include "tree.h" #include "tree-walk.h" #include "cache-tree.h" #include "unpack-trees.h" #include "progress.h" #include "refs.h" #include "attr.h" #include "split-index.h" #include "submodule.h" #include "submodule-config.h" #include "fsmonitor.h" #include "object-store.h" #include "promisor-remote.h" /* * Error messages expected by scripts out of plumbing commands such as * read-tree. Non-scripted Porcelain is not required to use these messages * and in fact are encouraged to reword them to better suit their particular * situation better. See how "git checkout" and "git merge" replaces * them using setup_unpack_trees_porcelain(), for example. */ static const char *unpack_plumbing_errors[NB_UNPACK_TREES_ERROR_TYPES] = { /* ERROR_WOULD_OVERWRITE */ "Entry '%s' would be overwritten by merge. Cannot merge.", /* ERROR_NOT_UPTODATE_FILE */ "Entry '%s' not uptodate. Cannot merge.", /* ERROR_NOT_UPTODATE_DIR */ "Updating '%s' would lose untracked files in it", /* ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN */ "Untracked working tree file '%s' would be overwritten by merge.", /* ERROR_WOULD_LOSE_UNTRACKED_REMOVED */ "Untracked working tree file '%s' would be removed by merge.", /* ERROR_BIND_OVERLAP */ "Entry '%s' overlaps with '%s'. Cannot bind.", /* ERROR_SPARSE_NOT_UPTODATE_FILE */ "Entry '%s' not uptodate. Cannot update sparse checkout.", /* ERROR_WOULD_LOSE_ORPHANED_OVERWRITTEN */ "Working tree file '%s' would be overwritten by sparse checkout update.", /* ERROR_WOULD_LOSE_ORPHANED_REMOVED */ "Working tree file '%s' would be removed by sparse checkout update.", /* ERROR_WOULD_LOSE_SUBMODULE */ "Submodule '%s' cannot checkout new HEAD.", }; #define ERRORMSG(o,type) \ ( ((o) && (o)->msgs[(type)]) \ ? ((o)->msgs[(type)]) \ : (unpack_plumbing_errors[(type)]) ) static const char *super_prefixed(const char *path) { /* * It is necessary and sufficient to have two static buffers * here, as the return value of this function is fed to * error() using the unpack_*_errors[] templates we see above. */ static struct strbuf buf[2] = {STRBUF_INIT, STRBUF_INIT}; static int super_prefix_len = -1; static unsigned idx = ARRAY_SIZE(buf) - 1; if (super_prefix_len < 0) { const char *super_prefix = get_super_prefix(); if (!super_prefix) { super_prefix_len = 0; } else { int i; for (i = 0; i < ARRAY_SIZE(buf); i++) strbuf_addstr(&buf[i], super_prefix); super_prefix_len = buf[0].len; } } if (!super_prefix_len) return path; if (++idx >= ARRAY_SIZE(buf)) idx = 0; strbuf_setlen(&buf[idx], super_prefix_len); strbuf_addstr(&buf[idx], path); return buf[idx].buf; } void setup_unpack_trees_porcelain(struct unpack_trees_options *opts, const char *cmd) { int i; const char **msgs = opts->msgs; const char *msg; argv_array_init(&opts->msgs_to_free); if (!strcmp(cmd, "checkout")) msg = advice_commit_before_merge ? _("Your local changes to the following files would be overwritten by checkout:\n%%s" "Please commit your changes or stash them before you switch branches.") : _("Your local changes to the following files would be overwritten by checkout:\n%%s"); else if (!strcmp(cmd, "merge")) msg = advice_commit_before_merge ? _("Your local changes to the following files would be overwritten by merge:\n%%s" "Please commit your changes or stash them before you merge.") : _("Your local changes to the following files would be overwritten by merge:\n%%s"); else msg = advice_commit_before_merge ? _("Your local changes to the following files would be overwritten by %s:\n%%s" "Please commit your changes or stash them before you %s.") : _("Your local changes to the following files would be overwritten by %s:\n%%s"); msgs[ERROR_WOULD_OVERWRITE] = msgs[ERROR_NOT_UPTODATE_FILE] = argv_array_pushf(&opts->msgs_to_free, msg, cmd, cmd); msgs[ERROR_NOT_UPTODATE_DIR] = _("Updating the following directories would lose untracked files in them:\n%s"); if (!strcmp(cmd, "checkout")) msg = advice_commit_before_merge ? _("The following untracked working tree files would be removed by checkout:\n%%s" "Please move or remove them before you switch branches.") : _("The following untracked working tree files would be removed by checkout:\n%%s"); else if (!strcmp(cmd, "merge")) msg = advice_commit_before_merge ? _("The following untracked working tree files would be removed by merge:\n%%s" "Please move or remove them before you merge.") : _("The following untracked working tree files would be removed by merge:\n%%s"); else msg = advice_commit_before_merge ? _("The following untracked working tree files would be removed by %s:\n%%s" "Please move or remove them before you %s.") : _("The following untracked working tree files would be removed by %s:\n%%s"); msgs[ERROR_WOULD_LOSE_UNTRACKED_REMOVED] = argv_array_pushf(&opts->msgs_to_free, msg, cmd, cmd); if (!strcmp(cmd, "checkout")) msg = advice_commit_before_merge ? _("The following untracked working tree files would be overwritten by checkout:\n%%s" "Please move or remove them before you switch branches.") : _("The following untracked working tree files would be overwritten by checkout:\n%%s"); else if (!strcmp(cmd, "merge")) msg = advice_commit_before_merge ? _("The following untracked working tree files would be overwritten by merge:\n%%s" "Please move or remove them before you merge.") : _("The following untracked working tree files would be overwritten by merge:\n%%s"); else msg = advice_commit_before_merge ? _("The following untracked working tree files would be overwritten by %s:\n%%s" "Please move or remove them before you %s.") : _("The following untracked working tree files would be overwritten by %s:\n%%s"); msgs[ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN] = argv_array_pushf(&opts->msgs_to_free, msg, cmd, cmd); /* * Special case: ERROR_BIND_OVERLAP refers to a pair of paths, we * cannot easily display it as a list. */ msgs[ERROR_BIND_OVERLAP] = _("Entry '%s' overlaps with '%s'. Cannot bind."); msgs[ERROR_SPARSE_NOT_UPTODATE_FILE] = _("Cannot update sparse checkout: the following entries are not up to date:\n%s"); msgs[ERROR_WOULD_LOSE_ORPHANED_OVERWRITTEN] = _("The following working tree files would be overwritten by sparse checkout update:\n%s"); msgs[ERROR_WOULD_LOSE_ORPHANED_REMOVED] = _("The following working tree files would be removed by sparse checkout update:\n%s"); msgs[ERROR_WOULD_LOSE_SUBMODULE] = _("Cannot update submodule:\n%s"); opts->show_all_errors = 1; /* rejected paths may not have a static buffer */ for (i = 0; i < ARRAY_SIZE(opts->unpack_rejects); i++) opts->unpack_rejects[i].strdup_strings = 1; } void clear_unpack_trees_porcelain(struct unpack_trees_options *opts) { argv_array_clear(&opts->msgs_to_free); memset(opts->msgs, 0, sizeof(opts->msgs)); } static int do_add_entry(struct unpack_trees_options *o, struct cache_entry *ce, unsigned int set, unsigned int clear) { clear |= CE_HASHED; if (set & CE_REMOVE) set |= CE_WT_REMOVE; ce->ce_flags = (ce->ce_flags & ~clear) | set; return add_index_entry(&o->result, ce, ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE); } static void add_entry(struct unpack_trees_options *o, const struct cache_entry *ce, unsigned int set, unsigned int clear) { do_add_entry(o, dup_cache_entry(ce, &o->result), set, clear); } /* * add error messages on path * corresponding to the type with the message * indicating if it should be display in porcelain or not */ static int add_rejected_path(struct unpack_trees_options *o, enum unpack_trees_error_types e, const char *path) { if (o->quiet) return -1; if (!o->show_all_errors) return error(ERRORMSG(o, e), super_prefixed(path)); /* * Otherwise, insert in a list for future display by * display_error_msgs() */ string_list_append(&o->unpack_rejects[e], path); return -1; } /* * display all the error messages stored in a nice way */ static void display_error_msgs(struct unpack_trees_options *o) { int e, i; int something_displayed = 0; for (e = 0; e < NB_UNPACK_TREES_ERROR_TYPES; e++) { struct string_list *rejects = &o->unpack_rejects[e]; if (rejects->nr > 0) { struct strbuf path = STRBUF_INIT; something_displayed = 1; for (i = 0; i < rejects->nr; i++) strbuf_addf(&path, "\t%s\n", rejects->items[i].string); error(ERRORMSG(o, e), super_prefixed(path.buf)); strbuf_release(&path); } string_list_clear(rejects, 0); } if (something_displayed) fprintf(stderr, _("Aborting\n")); } static int check_submodule_move_head(const struct cache_entry *ce, const char *old_id, const char *new_id, struct unpack_trees_options *o) { unsigned flags = SUBMODULE_MOVE_HEAD_DRY_RUN; const struct submodule *sub = submodule_from_ce(ce); if (!sub) return 0; if (o->reset) flags |= SUBMODULE_MOVE_HEAD_FORCE; if (submodule_move_head(ce->name, old_id, new_id, flags)) return add_rejected_path(o, ERROR_WOULD_LOSE_SUBMODULE, ce->name); return 0; } /* * Preform the loading of the repository's gitmodules file. This function is * used by 'check_update()' to perform loading of the gitmodules file in two * differnt situations: * (1) before removing entries from the working tree if the gitmodules file has * been marked for removal. This situation is specified by 'state' == NULL. * (2) before checking out entries to the working tree if the gitmodules file * has been marked for update. This situation is specified by 'state' != NULL. */ static void load_gitmodules_file(struct index_state *index, struct checkout *state) { int pos = index_name_pos(index, GITMODULES_FILE, strlen(GITMODULES_FILE)); if (pos >= 0) { struct cache_entry *ce = index->cache[pos]; if (!state && ce->ce_flags & CE_WT_REMOVE) { repo_read_gitmodules(the_repository); } else if (state && (ce->ce_flags & CE_UPDATE)) { submodule_free(the_repository); checkout_entry(ce, state, NULL, NULL); repo_read_gitmodules(the_repository); } } } static struct progress *get_progress(struct unpack_trees_options *o) { unsigned cnt = 0, total = 0; struct index_state *index = &o->result; if (!o->update || !o->verbose_update) return NULL; for (; cnt < index->cache_nr; cnt++) { const struct cache_entry *ce = index->cache[cnt]; if (ce->ce_flags & (CE_UPDATE | CE_WT_REMOVE)) total++; } return start_delayed_progress(_("Updating files"), total); } static void setup_collided_checkout_detection(struct checkout *state, struct index_state *index) { int i; state->clone = 1; for (i = 0; i < index->cache_nr; i++) index->cache[i]->ce_flags &= ~CE_MATCHED; } static void report_collided_checkout(struct index_state *index) { struct string_list list = STRING_LIST_INIT_NODUP; int i; for (i = 0; i < index->cache_nr; i++) { struct cache_entry *ce = index->cache[i]; if (!(ce->ce_flags & CE_MATCHED)) continue; string_list_append(&list, ce->name); ce->ce_flags &= ~CE_MATCHED; } list.cmp = fspathcmp; string_list_sort(&list); if (list.nr) { warning(_("the following paths have collided (e.g. case-sensitive paths\n" "on a case-insensitive filesystem) and only one from the same\n" "colliding group is in the working tree:\n")); for (i = 0; i < list.nr; i++) fprintf(stderr, " '%s'\n", list.items[i].string); } string_list_clear(&list, 0); } static int check_updates(struct unpack_trees_options *o) { unsigned cnt = 0; int errs = 0; struct progress *progress; struct index_state *index = &o->result; struct checkout state = CHECKOUT_INIT; int i; trace_performance_enter(); state.force = 1; state.quiet = 1; state.refresh_cache = 1; state.istate = index; if (o->clone) setup_collided_checkout_detection(&state, index); progress = get_progress(o); if (o->update) git_attr_set_direction(GIT_ATTR_CHECKOUT); if (should_update_submodules() && o->update && !o->dry_run) load_gitmodules_file(index, NULL); for (i = 0; i < index->cache_nr; i++) { const struct cache_entry *ce = index->cache[i]; if (ce->ce_flags & CE_WT_REMOVE) { display_progress(progress, ++cnt); if (o->update && !o->dry_run) unlink_entry(ce); } } remove_marked_cache_entries(index, 0); remove_scheduled_dirs(); if (should_update_submodules() && o->update && !o->dry_run) load_gitmodules_file(index, &state); enable_delayed_checkout(&state); if (has_promisor_remote() && o->update && !o->dry_run) { /* * Prefetch the objects that are to be checked out in the loop * below. */ struct oid_array to_fetch = OID_ARRAY_INIT; for (i = 0; i < index->cache_nr; i++) { struct cache_entry *ce = index->cache[i]; if (!(ce->ce_flags & CE_UPDATE) || S_ISGITLINK(ce->ce_mode)) continue; if (!oid_object_info_extended(the_repository, &ce->oid, NULL, OBJECT_INFO_FOR_PREFETCH)) continue; oid_array_append(&to_fetch, &ce->oid); } if (to_fetch.nr) promisor_remote_get_direct(the_repository, to_fetch.oid, to_fetch.nr); oid_array_clear(&to_fetch); } for (i = 0; i < index->cache_nr; i++) { struct cache_entry *ce = index->cache[i]; if (ce->ce_flags & CE_UPDATE) { if (ce->ce_flags & CE_WT_REMOVE) BUG("both update and delete flags are set on %s", ce->name); display_progress(progress, ++cnt); ce->ce_flags &= ~CE_UPDATE; if (o->update && !o->dry_run) { errs |= checkout_entry(ce, &state, NULL, NULL); } } } stop_progress(&progress); errs |= finish_delayed_checkout(&state, NULL); if (o->update) git_attr_set_direction(GIT_ATTR_CHECKIN); if (o->clone) report_collided_checkout(index); trace_performance_leave("check_updates"); return errs != 0; } static int verify_uptodate_sparse(const struct cache_entry *ce, struct unpack_trees_options *o); static int verify_absent_sparse(const struct cache_entry *ce, enum unpack_trees_error_types, struct unpack_trees_options *o); static int apply_sparse_checkout(struct index_state *istate, struct cache_entry *ce, struct unpack_trees_options *o) { int was_skip_worktree = ce_skip_worktree(ce); if (ce->ce_flags & CE_NEW_SKIP_WORKTREE) ce->ce_flags |= CE_SKIP_WORKTREE; else ce->ce_flags &= ~CE_SKIP_WORKTREE; if (was_skip_worktree != ce_skip_worktree(ce)) { ce->ce_flags |= CE_UPDATE_IN_BASE; mark_fsmonitor_invalid(istate, ce); istate->cache_changed |= CE_ENTRY_CHANGED; } /* * if (!was_skip_worktree && !ce_skip_worktree()) { * This is perfectly normal. Move on; * } */ /* * Merge strategies may set CE_UPDATE|CE_REMOVE outside checkout * area as a result of ce_skip_worktree() shortcuts in * verify_absent() and verify_uptodate(). * Make sure they don't modify worktree if they are already * outside checkout area */ if (was_skip_worktree && ce_skip_worktree(ce)) { ce->ce_flags &= ~CE_UPDATE; /* * By default, when CE_REMOVE is on, CE_WT_REMOVE is also * on to get that file removed from both index and worktree. * If that file is already outside worktree area, don't * bother remove it. */ if (ce->ce_flags & CE_REMOVE) ce->ce_flags &= ~CE_WT_REMOVE; } if (!was_skip_worktree && ce_skip_worktree(ce)) { /* * If CE_UPDATE is set, verify_uptodate() must be called already * also stat info may have lost after merged_entry() so calling * verify_uptodate() again may fail */ if (!(ce->ce_flags & CE_UPDATE) && verify_uptodate_sparse(ce, o)) return -1; ce->ce_flags |= CE_WT_REMOVE; ce->ce_flags &= ~CE_UPDATE; } if (was_skip_worktree && !ce_skip_worktree(ce)) { if (verify_absent_sparse(ce, ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN, o)) return -1; ce->ce_flags |= CE_UPDATE; } return 0; } static inline int call_unpack_fn(const struct cache_entry * const *src, struct unpack_trees_options *o) { int ret = o->fn(src, o); if (ret > 0) ret = 0; return ret; } static void mark_ce_used(struct cache_entry *ce, struct unpack_trees_options *o) { ce->ce_flags |= CE_UNPACKED; if (o->cache_bottom < o->src_index->cache_nr && o->src_index->cache[o->cache_bottom] == ce) { int bottom = o->cache_bottom; while (bottom < o->src_index->cache_nr && o->src_index->cache[bottom]->ce_flags & CE_UNPACKED) bottom++; o->cache_bottom = bottom; } } static void mark_all_ce_unused(struct index_state *index) { int i; for (i = 0; i < index->cache_nr; i++) index->cache[i]->ce_flags &= ~(CE_UNPACKED | CE_ADDED | CE_NEW_SKIP_WORKTREE); } static int locate_in_src_index(const struct cache_entry *ce, struct unpack_trees_options *o) { struct index_state *index = o->src_index; int len = ce_namelen(ce); int pos = index_name_pos(index, ce->name, len); if (pos < 0) pos = -1 - pos; return pos; } /* * We call unpack_index_entry() with an unmerged cache entry * only in diff-index, and it wants a single callback. Skip * the other unmerged entry with the same name. */ static void mark_ce_used_same_name(struct cache_entry *ce, struct unpack_trees_options *o) { struct index_state *index = o->src_index; int len = ce_namelen(ce); int pos; for (pos = locate_in_src_index(ce, o); pos < index->cache_nr; pos++) { struct cache_entry *next = index->cache[pos]; if (len != ce_namelen(next) || memcmp(ce->name, next->name, len)) break; mark_ce_used(next, o); } } static struct cache_entry *next_cache_entry(struct unpack_trees_options *o) { const struct index_state *index = o->src_index; int pos = o->cache_bottom; while (pos < index->cache_nr) { struct cache_entry *ce = index->cache[pos]; if (!(ce->ce_flags & CE_UNPACKED)) return ce; pos++; } return NULL; } static void add_same_unmerged(const struct cache_entry *ce, struct unpack_trees_options *o) { struct index_state *index = o->src_index; int len = ce_namelen(ce); int pos = index_name_pos(index, ce->name, len); if (0 <= pos) die("programming error in a caller of mark_ce_used_same_name"); for (pos = -pos - 1; pos < index->cache_nr; pos++) { struct cache_entry *next = index->cache[pos]; if (len != ce_namelen(next) || memcmp(ce->name, next->name, len)) break; add_entry(o, next, 0, 0); mark_ce_used(next, o); } } static int unpack_index_entry(struct cache_entry *ce, struct unpack_trees_options *o) { const struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, }; int ret; src[0] = ce; mark_ce_used(ce, o); if (ce_stage(ce)) { if (o->skip_unmerged) { add_entry(o, ce, 0, 0); return 0; } } ret = call_unpack_fn(src, o); if (ce_stage(ce)) mark_ce_used_same_name(ce, o); return ret; } static int find_cache_pos(struct traverse_info *, const char *p, size_t len); static void restore_cache_bottom(struct traverse_info *info, int bottom) { struct unpack_trees_options *o = info->data; if (o->diff_index_cached) return; o->cache_bottom = bottom; } static int switch_cache_bottom(struct traverse_info *info) { struct unpack_trees_options *o = info->data; int ret, pos; if (o->diff_index_cached) return 0; ret = o->cache_bottom; pos = find_cache_pos(info->prev, info->name, info->namelen); if (pos < -1) o->cache_bottom = -2 - pos; else if (pos < 0) o->cache_bottom = o->src_index->cache_nr; return ret; } static inline int are_same_oid(struct name_entry *name_j, struct name_entry *name_k) { return !is_null_oid(&name_j->oid) && !is_null_oid(&name_k->oid) && oideq(&name_j->oid, &name_k->oid); } static int all_trees_same_as_cache_tree(int n, unsigned long dirmask, struct name_entry *names, struct traverse_info *info) { struct unpack_trees_options *o = info->data; int i; if (!o->merge || dirmask != ((1 << n) - 1)) return 0; for (i = 1; i < n; i++) if (!are_same_oid(names, names + i)) return 0; return cache_tree_matches_traversal(o->src_index->cache_tree, names, info); } static int index_pos_by_traverse_info(struct name_entry *names, struct traverse_info *info) { struct unpack_trees_options *o = info->data; struct strbuf name = STRBUF_INIT; int pos; strbuf_make_traverse_path(&name, info, names->path, names->pathlen); strbuf_addch(&name, '/'); pos = index_name_pos(o->src_index, name.buf, name.len); if (pos >= 0) BUG("This is a directory and should not exist in index"); pos = -pos - 1; if (!starts_with(o->src_index->cache[pos]->name, name.buf) || (pos > 0 && starts_with(o->src_index->cache[pos-1]->name, name.buf))) BUG("pos must point at the first entry in this directory"); strbuf_release(&name); return pos; } /* * Fast path if we detect that all trees are the same as cache-tree at this * path. We'll walk these trees in an iterative loop using cache-tree/index * instead of ODB since we already know what these trees contain. */ static int traverse_by_cache_tree(int pos, int nr_entries, int nr_names, struct traverse_info *info) { struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, }; struct unpack_trees_options *o = info->data; struct cache_entry *tree_ce = NULL; int ce_len = 0; int i, d; if (!o->merge) BUG("We need cache-tree to do this optimization"); /* * Do what unpack_callback() and unpack_nondirectories() normally * do. But we walk all paths in an iterative loop instead. * * D/F conflicts and higher stage entries are not a concern * because cache-tree would be invalidated and we would never * get here in the first place. */ for (i = 0; i < nr_entries; i++) { int new_ce_len, len, rc; src[0] = o->src_index->cache[pos + i]; len = ce_namelen(src[0]); new_ce_len = cache_entry_size(len); if (new_ce_len > ce_len) { new_ce_len <<= 1; tree_ce = xrealloc(tree_ce, new_ce_len); memset(tree_ce, 0, new_ce_len); ce_len = new_ce_len; tree_ce->ce_flags = create_ce_flags(0); for (d = 1; d <= nr_names; d++) src[d] = tree_ce; } tree_ce->ce_mode = src[0]->ce_mode; tree_ce->ce_namelen = len; oidcpy(&tree_ce->oid, &src[0]->oid); memcpy(tree_ce->name, src[0]->name, len + 1); rc = call_unpack_fn((const struct cache_entry * const *)src, o); if (rc < 0) { free(tree_ce); return rc; } mark_ce_used(src[0], o); } free(tree_ce); if (o->debug_unpack) printf("Unpacked %d entries from %s to %s using cache-tree\n", nr_entries, o->src_index->cache[pos]->name, o->src_index->cache[pos + nr_entries - 1]->name); return 0; } static int traverse_trees_recursive(int n, unsigned long dirmask, unsigned long df_conflicts, struct name_entry *names, struct traverse_info *info) { struct unpack_trees_options *o = info->data; int i, ret, bottom; int nr_buf = 0; struct tree_desc t[MAX_UNPACK_TREES]; void *buf[MAX_UNPACK_TREES]; struct traverse_info newinfo; struct name_entry *p; int nr_entries; nr_entries = all_trees_same_as_cache_tree(n, dirmask, names, info); if (nr_entries > 0) { int pos = index_pos_by_traverse_info(names, info); if (!o->merge || df_conflicts) BUG("Wrong condition to get here buddy"); /* * All entries up to 'pos' must have been processed * (i.e. marked CE_UNPACKED) at this point. But to be safe, * save and restore cache_bottom anyway to not miss * unprocessed entries before 'pos'. */ bottom = o->cache_bottom; ret = traverse_by_cache_tree(pos, nr_entries, n, info); o->cache_bottom = bottom; return ret; } p = names; while (!p->mode) p++; newinfo = *info; newinfo.prev = info; newinfo.pathspec = info->pathspec; newinfo.name = p->path; newinfo.namelen = p->pathlen; newinfo.mode = p->mode; newinfo.pathlen = st_add3(newinfo.pathlen, tree_entry_len(p), 1); newinfo.df_conflicts |= df_conflicts; /* * Fetch the tree from the ODB for each peer directory in the * n commits. * * For 2- and 3-way traversals, we try to avoid hitting the * ODB twice for the same OID. This should yield a nice speed * up in checkouts and merges when the commits are similar. * * We don't bother doing the full O(n^2) search for larger n, * because wider traversals don't happen that often and we * avoid the search setup. * * When 2 peer OIDs are the same, we just copy the tree * descriptor data. This implicitly borrows the buffer * data from the earlier cell. */ for (i = 0; i < n; i++, dirmask >>= 1) { if (i > 0 && are_same_oid(&names[i], &names[i - 1])) t[i] = t[i - 1]; else if (i > 1 && are_same_oid(&names[i], &names[i - 2])) t[i] = t[i - 2]; else { const struct object_id *oid = NULL; if (dirmask & 1) oid = &names[i].oid; buf[nr_buf++] = fill_tree_descriptor(the_repository, t + i, oid); } } bottom = switch_cache_bottom(&newinfo); ret = traverse_trees(o->src_index, n, t, &newinfo); restore_cache_bottom(&newinfo, bottom); for (i = 0; i < nr_buf; i++) free(buf[i]); return ret; } /* * Compare the traverse-path to the cache entry without actually * having to generate the textual representation of the traverse * path. * * NOTE! This *only* compares up to the size of the traverse path * itself - the caller needs to do the final check for the cache * entry having more data at the end! */ static int do_compare_entry_piecewise(const struct cache_entry *ce, const struct traverse_info *info, const char *name, size_t namelen, unsigned mode) { int pathlen, ce_len; const char *ce_name; if (info->prev) { int cmp = do_compare_entry_piecewise(ce, info->prev, info->name, info->namelen, info->mode); if (cmp) return cmp; } pathlen = info->pathlen; ce_len = ce_namelen(ce); /* If ce_len < pathlen then we must have previously hit "name == directory" entry */ if (ce_len < pathlen) return -1; ce_len -= pathlen; ce_name = ce->name + pathlen; return df_name_compare(ce_name, ce_len, S_IFREG, name, namelen, mode); } static int do_compare_entry(const struct cache_entry *ce, const struct traverse_info *info, const char *name, size_t namelen, unsigned mode) { int pathlen, ce_len; const char *ce_name; int cmp; /* * If we have not precomputed the traverse path, it is quicker * to avoid doing so. But if we have precomputed it, * it is quicker to use the precomputed version. */ if (!info->traverse_path) return do_compare_entry_piecewise(ce, info, name, namelen, mode); cmp = strncmp(ce->name, info->traverse_path, info->pathlen); if (cmp) return cmp; pathlen = info->pathlen; ce_len = ce_namelen(ce); if (ce_len < pathlen) return -1; ce_len -= pathlen; ce_name = ce->name + pathlen; return df_name_compare(ce_name, ce_len, S_IFREG, name, namelen, mode); } static int compare_entry(const struct cache_entry *ce, const struct traverse_info *info, const struct name_entry *n) { int cmp = do_compare_entry(ce, info, n->path, n->pathlen, n->mode); if (cmp) return cmp; /* * Even if the beginning compared identically, the ce should * compare as bigger than a directory leading up to it! */ return ce_namelen(ce) > traverse_path_len(info, tree_entry_len(n)); } static int ce_in_traverse_path(const struct cache_entry *ce, const struct traverse_info *info) { if (!info->prev) return 1; if (do_compare_entry(ce, info->prev, info->name, info->namelen, info->mode)) return 0; /* * If ce (blob) is the same name as the path (which is a tree * we will be descending into), it won't be inside it. */ return (info->pathlen < ce_namelen(ce)); } static struct cache_entry *create_ce_entry(const struct traverse_info *info, const struct name_entry *n, int stage, struct index_state *istate, int is_transient) { size_t len = traverse_path_len(info, tree_entry_len(n)); struct cache_entry *ce = is_transient ? make_empty_transient_cache_entry(len) : make_empty_cache_entry(istate, len); ce->ce_mode = create_ce_mode(n->mode); ce->ce_flags = create_ce_flags(stage); ce->ce_namelen = len; oidcpy(&ce->oid, &n->oid); /* len+1 because the cache_entry allocates space for NUL */ make_traverse_path(ce->name, len + 1, info, n->path, n->pathlen); return ce; } /* * Note that traverse_by_cache_tree() duplicates some logic in this function * without actually calling it. If you change the logic here you may need to * check and change there as well. */ static int unpack_nondirectories(int n, unsigned long mask, unsigned long dirmask, struct cache_entry **src, const struct name_entry *names, const struct traverse_info *info) { int i; struct unpack_trees_options *o = info->data; unsigned long conflicts = info->df_conflicts | dirmask; /* Do we have *only* directories? Nothing to do */ if (mask == dirmask && !src[0]) return 0; /* * Ok, we've filled in up to any potential index entry in src[0], * now do the rest. */ for (i = 0; i < n; i++) { int stage; unsigned int bit = 1ul << i; if (conflicts & bit) { src[i + o->merge] = o->df_conflict_entry; continue; } if (!(mask & bit)) continue; if (!o->merge) stage = 0; else if (i + 1 < o->head_idx) stage = 1; else if (i + 1 > o->head_idx) stage = 3; else stage = 2; /* * If the merge bit is set, then the cache entries are * discarded in the following block. In this case, * construct "transient" cache_entries, as they are * not stored in the index. otherwise construct the * cache entry from the index aware logic. */ src[i + o->merge] = create_ce_entry(info, names + i, stage, &o->result, o->merge); } if (o->merge) { int rc = call_unpack_fn((const struct cache_entry * const *)src, o); for (i = 0; i < n; i++) { struct cache_entry *ce = src[i + o->merge]; if (ce != o->df_conflict_entry) discard_cache_entry(ce); } return rc; } for (i = 0; i < n; i++) if (src[i] && src[i] != o->df_conflict_entry) if (do_add_entry(o, src[i], 0, 0)) return -1; return 0; } static int unpack_failed(struct unpack_trees_options *o, const char *message) { discard_index(&o->result); if (!o->quiet && !o->exiting_early) { if (message) return error("%s", message); return -1; } return -1; } /* * The tree traversal is looking at name p. If we have a matching entry, * return it. If name p is a directory in the index, do not return * anything, as we will want to match it when the traversal descends into * the directory. */ static int find_cache_pos(struct traverse_info *info, const char *p, size_t p_len) { int pos; struct unpack_trees_options *o = info->data; struct index_state *index = o->src_index; int pfxlen = info->pathlen; for (pos = o->cache_bottom; pos < index->cache_nr; pos++) { const struct cache_entry *ce = index->cache[pos]; const char *ce_name, *ce_slash; int cmp, ce_len; if (ce->ce_flags & CE_UNPACKED) { /* * cache_bottom entry is already unpacked, so * we can never match it; don't check it * again. */ if (pos == o->cache_bottom) ++o->cache_bottom; continue; } if (!ce_in_traverse_path(ce, info)) { /* * Check if we can skip future cache checks * (because we're already past all possible * entries in the traverse path). */ if (info->traverse_path) { if (strncmp(ce->name, info->traverse_path, info->pathlen) > 0) break; } continue; } ce_name = ce->name + pfxlen; ce_slash = strchr(ce_name, '/'); if (ce_slash) ce_len = ce_slash - ce_name; else ce_len = ce_namelen(ce) - pfxlen; cmp = name_compare(p, p_len, ce_name, ce_len); /* * Exact match; if we have a directory we need to * delay returning it. */ if (!cmp) return ce_slash ? -2 - pos : pos; if (0 < cmp) continue; /* keep looking */ /* * ce_name sorts after p->path; could it be that we * have files under p->path directory in the index? * E.g. ce_name == "t-i", and p->path == "t"; we may * have "t/a" in the index. */ if (p_len < ce_len && !memcmp(ce_name, p, p_len) && ce_name[p_len] < '/') continue; /* keep looking */ break; } return -1; } static struct cache_entry *find_cache_entry(struct traverse_info *info, const struct name_entry *p) { int pos = find_cache_pos(info, p->path, p->pathlen); struct unpack_trees_options *o = info->data; if (0 <= pos) return o->src_index->cache[pos]; else return NULL; } static void debug_path(struct traverse_info *info) { if (info->prev) { debug_path(info->prev); if (*info->prev->name) putchar('/'); } printf("%s", info->name); } static void debug_name_entry(int i, struct name_entry *n) { printf("ent#%d %06o %s\n", i, n->path ? n->mode : 0, n->path ? n->path : "(missing)"); } static void debug_unpack_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info) { int i; printf("* unpack mask %lu, dirmask %lu, cnt %d ", mask, dirmask, n); debug_path(info); putchar('\n'); for (i = 0; i < n; i++) debug_name_entry(i, names + i); } /* * Note that traverse_by_cache_tree() duplicates some logic in this function * without actually calling it. If you change the logic here you may need to * check and change there as well. */ static int unpack_callback(int n, unsigned long mask, unsigned long dirmask, struct name_entry *names, struct traverse_info *info) { struct cache_entry *src[MAX_UNPACK_TREES + 1] = { NULL, }; struct unpack_trees_options *o = info->data; const struct name_entry *p = names; /* Find first entry with a real name (we could use "mask" too) */ while (!p->mode) p++; if (o->debug_unpack) debug_unpack_callback(n, mask, dirmask, names, info); /* Are we supposed to look at the index too? */ if (o->merge) { while (1) { int cmp; struct cache_entry *ce; if (o->diff_index_cached) ce = next_cache_entry(o); else ce = find_cache_entry(info, p); if (!ce) break; cmp = compare_entry(ce, info, p); if (cmp < 0) { if (unpack_index_entry(ce, o) < 0) return unpack_failed(o, NULL); continue; } if (!cmp) { if (ce_stage(ce)) { /* * If we skip unmerged index * entries, we'll skip this * entry *and* the tree * entries associated with it! */ if (o->skip_unmerged) { add_same_unmerged(ce, o); return mask; } } src[0] = ce; } break; } } if (unpack_nondirectories(n, mask, dirmask, src, names, info) < 0) return -1; if (o->merge && src[0]) { if (ce_stage(src[0])) mark_ce_used_same_name(src[0], o); else mark_ce_used(src[0], o); } /* Now handle any directories.. */ if (dirmask) { /* special case: "diff-index --cached" looking at a tree */ if (o->diff_index_cached && n == 1 && dirmask == 1 && S_ISDIR(names->mode)) { int matches; matches = cache_tree_matches_traversal(o->src_index->cache_tree, names, info); /* * Everything under the name matches; skip the * entire hierarchy. diff_index_cached codepath * special cases D/F conflicts in such a way that * it does not do any look-ahead, so this is safe. */ if (matches) { o->cache_bottom += matches; return mask; } } if (traverse_trees_recursive(n, dirmask, mask & ~dirmask, names, info) < 0) return -1; return mask; } return mask; } static int clear_ce_flags_1(struct index_state *istate, struct cache_entry **cache, int nr, struct strbuf *prefix, int select_mask, int clear_mask, struct pattern_list *pl, enum pattern_match_result default_match, int progress_nr); /* Whole directory matching */ static int clear_ce_flags_dir(struct index_state *istate, struct cache_entry **cache, int nr, struct strbuf *prefix, char *basename, int select_mask, int clear_mask, struct pattern_list *pl, enum pattern_match_result default_match, int progress_nr) { struct cache_entry **cache_end; int dtype = DT_DIR; int rc; enum pattern_match_result ret, orig_ret; orig_ret = path_matches_pattern_list(prefix->buf, prefix->len, basename, &dtype, pl, istate); strbuf_addch(prefix, '/'); /* If undecided, use matching result of parent dir in defval */ if (orig_ret == UNDECIDED) ret = default_match; else ret = orig_ret; for (cache_end = cache; cache_end != cache + nr; cache_end++) { struct cache_entry *ce = *cache_end; if (strncmp(ce->name, prefix->buf, prefix->len)) break; } if (pl->use_cone_patterns && orig_ret == MATCHED_RECURSIVE) { struct cache_entry **ce = cache; rc = (cache_end - cache) / sizeof(struct cache_entry *); while (ce < cache_end) { (*ce)->ce_flags &= ~clear_mask; ce++; } } else if (pl->use_cone_patterns && orig_ret == NOT_MATCHED) { rc = (cache_end - cache) / sizeof(struct cache_entry *); } else { rc = clear_ce_flags_1(istate, cache, cache_end - cache, prefix, select_mask, clear_mask, pl, ret, progress_nr); } strbuf_setlen(prefix, prefix->len - 1); return rc; } /* * Traverse the index, find every entry that matches according to * o->pl. Do "ce_flags &= ~clear_mask" on those entries. Return the * number of traversed entries. * * If select_mask is non-zero, only entries whose ce_flags has on of * those bits enabled are traversed. * * cache : pointer to an index entry * prefix_len : an offset to its path * * The current path ("prefix") including the trailing '/' is * cache[0]->name[0..(prefix_len-1)] * Top level path has prefix_len zero. */ static int clear_ce_flags_1(struct index_state *istate, struct cache_entry **cache, int nr, struct strbuf *prefix, int select_mask, int clear_mask, struct pattern_list *pl, enum pattern_match_result default_match, int progress_nr) { struct cache_entry **cache_end = cache + nr; /* * Process all entries that have the given prefix and meet * select_mask condition */ while(cache != cache_end) { struct cache_entry *ce = *cache; const char *name, *slash; int len, dtype; enum pattern_match_result ret; display_progress(istate->progress, progress_nr); if (select_mask && !(ce->ce_flags & select_mask)) { cache++; progress_nr++; continue; } if (prefix->len && strncmp(ce->name, prefix->buf, prefix->len)) break; name = ce->name + prefix->len; slash = strchr(name, '/'); /* If it's a directory, try whole directory match first */ if (slash) { int processed; len = slash - name; strbuf_add(prefix, name, len); processed = clear_ce_flags_dir(istate, cache, cache_end - cache, prefix, prefix->buf + prefix->len - len, select_mask, clear_mask, pl, default_match, progress_nr); /* clear_c_f_dir eats a whole dir already? */ if (processed) { cache += processed; progress_nr += processed; strbuf_setlen(prefix, prefix->len - len); continue; } strbuf_addch(prefix, '/'); processed = clear_ce_flags_1(istate, cache, cache_end - cache, prefix, select_mask, clear_mask, pl, default_match, progress_nr); cache += processed; progress_nr += processed; strbuf_setlen(prefix, prefix->len - len - 1); continue; } /* Non-directory */ dtype = ce_to_dtype(ce); ret = path_matches_pattern_list(ce->name, ce_namelen(ce), name, &dtype, pl, istate); if (ret == UNDECIDED) ret = default_match; if (ret == MATCHED || ret == MATCHED_RECURSIVE) ce->ce_flags &= ~clear_mask; cache++; progress_nr++; } display_progress(istate->progress, progress_nr); return nr - (cache_end - cache); } static int clear_ce_flags(struct index_state *istate, int select_mask, int clear_mask, struct pattern_list *pl, int show_progress) { static struct strbuf prefix = STRBUF_INIT; char label[100]; int rval; strbuf_reset(&prefix); if (show_progress) istate->progress = start_delayed_progress( _("Updating index flags"), istate->cache_nr); xsnprintf(label, sizeof(label), "clear_ce_flags(0x%08lx,0x%08lx)", (unsigned long)select_mask, (unsigned long)clear_mask); trace2_region_enter("unpack_trees", label, the_repository); rval = clear_ce_flags_1(istate, istate->cache, istate->cache_nr, &prefix, select_mask, clear_mask, pl, 0, 0); trace2_region_leave("unpack_trees", label, the_repository); stop_progress(&istate->progress); return rval; } /* * Set/Clear CE_NEW_SKIP_WORKTREE according to $GIT_DIR/info/sparse-checkout */ static void mark_new_skip_worktree(struct pattern_list *pl, struct index_state *istate, int select_flag, int skip_wt_flag, int show_progress) { int i; /* * 1. Pretend the narrowest worktree: only unmerged entries * are checked out */ for (i = 0; i < istate->cache_nr; i++) { struct cache_entry *ce = istate->cache[i]; if (select_flag && !(ce->ce_flags & select_flag)) continue; if (!ce_stage(ce) && !(ce->ce_flags & CE_CONFLICTED)) ce->ce_flags |= skip_wt_flag; else ce->ce_flags &= ~skip_wt_flag; } /* * 2. Widen worktree according to sparse-checkout file. * Matched entries will have skip_wt_flag cleared (i.e. "in") */ clear_ce_flags(istate, select_flag, skip_wt_flag, pl, show_progress); } static int verify_absent(const struct cache_entry *, enum unpack_trees_error_types, struct unpack_trees_options *); /* * N-way merge "len" trees. Returns 0 on success, -1 on failure to manipulate the * resulting index, -2 on failure to reflect the changes to the work tree. * * CE_ADDED, CE_UNPACKED and CE_NEW_SKIP_WORKTREE are used internally */ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options *o) { int i, ret; static struct cache_entry *dfc; struct pattern_list pl; if (len > MAX_UNPACK_TREES) die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES); trace_performance_enter(); memset(&pl, 0, sizeof(pl)); if (!core_apply_sparse_checkout || !o->update) o->skip_sparse_checkout = 1; if (!o->skip_sparse_checkout && !o->pl) { char *sparse = git_pathdup("info/sparse-checkout"); pl.use_cone_patterns = core_sparse_checkout_cone; if (add_patterns_from_file_to_list(sparse, "", 0, &pl, NULL) < 0) o->skip_sparse_checkout = 1; else o->pl = &pl; free(sparse); } memset(&o->result, 0, sizeof(o->result)); o->result.initialized = 1; o->result.timestamp.sec = o->src_index->timestamp.sec; o->result.timestamp.nsec = o->src_index->timestamp.nsec; o->result.version = o->src_index->version; if (!o->src_index->split_index) { o->result.split_index = NULL; } else if (o->src_index == o->dst_index) { /* * o->dst_index (and thus o->src_index) will be discarded * and overwritten with o->result at the end of this function, * so just use src_index's split_index to avoid having to * create a new one. */ o->result.split_index = o->src_index->split_index; o->result.split_index->refcount++; } else { o->result.split_index = init_split_index(&o->result); } oidcpy(&o->result.oid, &o->src_index->oid); o->merge_size = len; mark_all_ce_unused(o->src_index); /* * Sparse checkout loop #1: set NEW_SKIP_WORKTREE on existing entries */ if (!o->skip_sparse_checkout) mark_new_skip_worktree(o->pl, o->src_index, 0, CE_NEW_SKIP_WORKTREE, o->verbose_update); if (!dfc) dfc = xcalloc(1, cache_entry_size(0)); o->df_conflict_entry = dfc; if (len) { const char *prefix = o->prefix ? o->prefix : ""; struct traverse_info info; setup_traverse_info(&info, prefix); info.fn = unpack_callback; info.data = o; info.show_all_errors = o->show_all_errors; info.pathspec = o->pathspec; if (o->prefix) { /* * Unpack existing index entries that sort before the * prefix the tree is spliced into. Note that o->merge * is always true in this case. */ while (1) { struct cache_entry *ce = next_cache_entry(o); if (!ce) break; if (ce_in_traverse_path(ce, &info)) break; if (unpack_index_entry(ce, o) < 0) goto return_failed; } } trace_performance_enter(); ret = traverse_trees(o->src_index, len, t, &info); trace_performance_leave("traverse_trees"); if (ret < 0) goto return_failed; } /* Any left-over entries in the index? */ if (o->merge) { while (1) { struct cache_entry *ce = next_cache_entry(o); if (!ce) break; if (unpack_index_entry(ce, o) < 0) goto return_failed; } } mark_all_ce_unused(o->src_index); if (o->trivial_merges_only && o->nontrivial_merge) { ret = unpack_failed(o, "Merge requires file-level merging"); goto done; } if (!o->skip_sparse_checkout) { int empty_worktree = 1; /* * Sparse checkout loop #2: set NEW_SKIP_WORKTREE on entries not in loop #1 * If the will have NEW_SKIP_WORKTREE, also set CE_SKIP_WORKTREE * so apply_sparse_checkout() won't attempt to remove it from worktree */ mark_new_skip_worktree(o->pl, &o->result, CE_ADDED, CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE, o->verbose_update); ret = 0; for (i = 0; i < o->result.cache_nr; i++) { struct cache_entry *ce = o->result.cache[i]; /* * Entries marked with CE_ADDED in merged_entry() do not have * verify_absent() check (the check is effectively disabled * because CE_NEW_SKIP_WORKTREE is set unconditionally). * * Do the real check now because we have had * correct CE_NEW_SKIP_WORKTREE */ if (ce->ce_flags & CE_ADDED && verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN, o)) { if (!o->show_all_errors) goto return_failed; ret = -1; } if (apply_sparse_checkout(&o->result, ce, o)) { if (!o->show_all_errors) goto return_failed; ret = -1; } if (!ce_skip_worktree(ce)) empty_worktree = 0; } if (ret < 0) goto return_failed; /* * Sparse checkout is meant to narrow down checkout area * but it does not make sense to narrow down to empty working * tree. This is usually a mistake in sparse checkout rules. * Do not allow users to do that. */ if (o->result.cache_nr && empty_worktree) { ret = unpack_failed(o, "Sparse checkout leaves no entry on working directory"); goto done; } } ret = check_updates(o) ? (-2) : 0; if (o->dst_index) { move_index_extensions(&o->result, o->src_index); if (!ret) { if (git_env_bool("GIT_TEST_CHECK_CACHE_TREE", 0)) cache_tree_verify(the_repository, &o->result); if (!o->result.cache_tree) o->result.cache_tree = cache_tree(); if (!cache_tree_fully_valid(o->result.cache_tree)) cache_tree_update(&o->result, WRITE_TREE_SILENT | WRITE_TREE_REPAIR); } o->result.updated_workdir = 1; discard_index(o->dst_index); *o->dst_index = o->result; } else { discard_index(&o->result); } o->src_index = NULL; done: trace_performance_leave("unpack_trees"); if (!o->keep_pattern_list) clear_pattern_list(&pl); return ret; return_failed: if (o->show_all_errors) display_error_msgs(o); mark_all_ce_unused(o->src_index); ret = unpack_failed(o, NULL); if (o->exiting_early) ret = 0; goto done; } /* Here come the merge functions */ static int reject_merge(const struct cache_entry *ce, struct unpack_trees_options *o) { return add_rejected_path(o, ERROR_WOULD_OVERWRITE, ce->name); } static int same(const struct cache_entry *a, const struct cache_entry *b) { if (!!a != !!b) return 0; if (!a && !b) return 1; if ((a->ce_flags | b->ce_flags) & CE_CONFLICTED) return 0; return a->ce_mode == b->ce_mode && oideq(&a->oid, &b->oid); } /* * When a CE gets turned into an unmerged entry, we * want it to be up-to-date */ static int verify_uptodate_1(const struct cache_entry *ce, struct unpack_trees_options *o, enum unpack_trees_error_types error_type) { struct stat st; if (o->index_only) return 0; /* * CE_VALID and CE_SKIP_WORKTREE cheat, we better check again * if this entry is truly up-to-date because this file may be * overwritten. */ if ((ce->ce_flags & CE_VALID) || ce_skip_worktree(ce)) ; /* keep checking */ else if (o->reset || ce_uptodate(ce)) return 0; if (!lstat(ce->name, &st)) { int flags = CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE; unsigned changed = ie_match_stat(o->src_index, ce, &st, flags); if (submodule_from_ce(ce)) { int r = check_submodule_move_head(ce, "HEAD", oid_to_hex(&ce->oid), o); if (r) return add_rejected_path(o, error_type, ce->name); return 0; } if (!changed) return 0; /* * Historic default policy was to allow submodule to be out * of sync wrt the superproject index. If the submodule was * not considered interesting above, we don't care here. */ if (S_ISGITLINK(ce->ce_mode)) return 0; errno = 0; } if (errno == ENOENT) return 0; return add_rejected_path(o, error_type, ce->name); } int verify_uptodate(const struct cache_entry *ce, struct unpack_trees_options *o) { if (!o->skip_sparse_checkout && (ce->ce_flags & CE_NEW_SKIP_WORKTREE)) return 0; return verify_uptodate_1(ce, o, ERROR_NOT_UPTODATE_FILE); } static int verify_uptodate_sparse(const struct cache_entry *ce, struct unpack_trees_options *o) { return verify_uptodate_1(ce, o, ERROR_SPARSE_NOT_UPTODATE_FILE); } /* * TODO: We should actually invalidate o->result, not src_index [1]. * But since cache tree and untracked cache both are not copied to * o->result until unpacking is complete, we invalidate them on * src_index instead with the assumption that they will be copied to * dst_index at the end. * * [1] src_index->cache_tree is also used in unpack_callback() so if * we invalidate o->result, we need to update it to use * o->result.cache_tree as well. */ static void invalidate_ce_path(const struct cache_entry *ce, struct unpack_trees_options *o) { if (!ce) return; cache_tree_invalidate_path(o->src_index, ce->name); untracked_cache_invalidate_path(o->src_index, ce->name, 1); } /* * Check that checking out ce->sha1 in subdir ce->name is not * going to overwrite any working files. * * Currently, git does not checkout subprojects during a superproject * checkout, so it is not going to overwrite anything. */ static int verify_clean_submodule(const char *old_sha1, const struct cache_entry *ce, struct unpack_trees_options *o) { if (!submodule_from_ce(ce)) return 0; return check_submodule_move_head(ce, old_sha1, oid_to_hex(&ce->oid), o); } static int verify_clean_subdirectory(const struct cache_entry *ce, struct unpack_trees_options *o) { /* * we are about to extract "ce->name"; we would not want to lose * anything in the existing directory there. */ int namelen; int i; struct dir_struct d; char *pathbuf; int cnt = 0; if (S_ISGITLINK(ce->ce_mode)) { struct object_id oid; int sub_head = resolve_gitlink_ref(ce->name, "HEAD", &oid); /* * If we are not going to update the submodule, then * we don't care. */ if (!sub_head && oideq(&oid, &ce->oid)) return 0; return verify_clean_submodule(sub_head ? NULL : oid_to_hex(&oid), ce, o); } /* * First let's make sure we do not have a local modification * in that directory. */ namelen = ce_namelen(ce); for (i = locate_in_src_index(ce, o); i < o->src_index->cache_nr; i++) { struct cache_entry *ce2 = o->src_index->cache[i]; int len = ce_namelen(ce2); if (len < namelen || strncmp(ce->name, ce2->name, namelen) || ce2->name[namelen] != '/') break; /* * ce2->name is an entry in the subdirectory to be * removed. */ if (!ce_stage(ce2)) { if (verify_uptodate(ce2, o)) return -1; add_entry(o, ce2, CE_REMOVE, 0); invalidate_ce_path(ce, o); mark_ce_used(ce2, o); } cnt++; } /* * Then we need to make sure that we do not lose a locally * present file that is not ignored. */ pathbuf = xstrfmt("%.*s/", namelen, ce->name); memset(&d, 0, sizeof(d)); if (o->dir) d.exclude_per_dir = o->dir->exclude_per_dir; i = read_directory(&d, o->src_index, pathbuf, namelen+1, NULL); if (i) return add_rejected_path(o, ERROR_NOT_UPTODATE_DIR, ce->name); free(pathbuf); return cnt; } /* * This gets called when there was no index entry for the tree entry 'dst', * but we found a file in the working tree that 'lstat()' said was fine, * and we're on a case-insensitive filesystem. * * See if we can find a case-insensitive match in the index that also * matches the stat information, and assume it's that other file! */ static int icase_exists(struct unpack_trees_options *o, const char *name, int len, struct stat *st) { const struct cache_entry *src; src = index_file_exists(o->src_index, name, len, 1); return src && !ie_match_stat(o->src_index, src, st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE); } static int check_ok_to_remove(const char *name, int len, int dtype, const struct cache_entry *ce, struct stat *st, enum unpack_trees_error_types error_type, struct unpack_trees_options *o) { const struct cache_entry *result; /* * It may be that the 'lstat()' succeeded even though * target 'ce' was absent, because there is an old * entry that is different only in case.. * * Ignore that lstat() if it matches. */ if (ignore_case && icase_exists(o, name, len, st)) return 0; if (o->dir && is_excluded(o->dir, o->src_index, name, &dtype)) /* * ce->name is explicitly excluded, so it is Ok to * overwrite it. */ return 0; if (S_ISDIR(st->st_mode)) { /* * We are checking out path "foo" and * found "foo/." in the working tree. * This is tricky -- if we have modified * files that are in "foo/" we would lose * them. */ if (verify_clean_subdirectory(ce, o) < 0) return -1; return 0; } /* * The previous round may already have decided to * delete this path, which is in a subdirectory that * is being replaced with a blob. */ result = index_file_exists(&o->result, name, len, 0); if (result) { if (result->ce_flags & CE_REMOVE) return 0; } return add_rejected_path(o, error_type, name); } /* * We do not want to remove or overwrite a working tree file that * is not tracked, unless it is ignored. */ static int verify_absent_1(const struct cache_entry *ce, enum unpack_trees_error_types error_type, struct unpack_trees_options *o) { int len; struct stat st; if (o->index_only || o->reset || !o->update) return 0; len = check_leading_path(ce->name, ce_namelen(ce)); if (!len) return 0; else if (len > 0) { char *path; int ret; path = xmemdupz(ce->name, len); if (lstat(path, &st)) ret = error_errno("cannot stat '%s'", path); else { if (submodule_from_ce(ce)) ret = check_submodule_move_head(ce, oid_to_hex(&ce->oid), NULL, o); else ret = check_ok_to_remove(path, len, DT_UNKNOWN, NULL, &st, error_type, o); } free(path); return ret; } else if (lstat(ce->name, &st)) { if (errno != ENOENT) return error_errno("cannot stat '%s'", ce->name); return 0; } else { if (submodule_from_ce(ce)) return check_submodule_move_head(ce, oid_to_hex(&ce->oid), NULL, o); return check_ok_to_remove(ce->name, ce_namelen(ce), ce_to_dtype(ce), ce, &st, error_type, o); } } static int verify_absent(const struct cache_entry *ce, enum unpack_trees_error_types error_type, struct unpack_trees_options *o) { if (!o->skip_sparse_checkout && (ce->ce_flags & CE_NEW_SKIP_WORKTREE)) return 0; return verify_absent_1(ce, error_type, o); } static int verify_absent_sparse(const struct cache_entry *ce, enum unpack_trees_error_types error_type, struct unpack_trees_options *o) { enum unpack_trees_error_types orphaned_error = error_type; if (orphaned_error == ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN) orphaned_error = ERROR_WOULD_LOSE_ORPHANED_OVERWRITTEN; return verify_absent_1(ce, orphaned_error, o); } static int merged_entry(const struct cache_entry *ce, const struct cache_entry *old, struct unpack_trees_options *o) { int update = CE_UPDATE; struct cache_entry *merge = dup_cache_entry(ce, &o->result); if (!old) { /* * New index entries. In sparse checkout, the following * verify_absent() will be delayed until after * traverse_trees() finishes in unpack_trees(), then: * * - CE_NEW_SKIP_WORKTREE will be computed correctly * - verify_absent() be called again, this time with * correct CE_NEW_SKIP_WORKTREE * * verify_absent() call here does nothing in sparse * checkout (i.e. o->skip_sparse_checkout == 0) */ update |= CE_ADDED; merge->ce_flags |= CE_NEW_SKIP_WORKTREE; if (verify_absent(merge, ERROR_WOULD_LOSE_UNTRACKED_OVERWRITTEN, o)) { discard_cache_entry(merge); return -1; } invalidate_ce_path(merge, o); if (submodule_from_ce(ce)) { int ret = check_submodule_move_head(ce, NULL, oid_to_hex(&ce->oid), o); if (ret) return ret; } } else if (!(old->ce_flags & CE_CONFLICTED)) { /* * See if we can re-use the old CE directly? * That way we get the uptodate stat info. * * This also removes the UPDATE flag on a match; otherwise * we will end up overwriting local changes in the work tree. */ if (same(old, merge)) { copy_cache_entry(merge, old); update = 0; } else { if (verify_uptodate(old, o)) { discard_cache_entry(merge); return -1; } /* Migrate old flags over */ update |= old->ce_flags & (CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE); invalidate_ce_path(old, o); } if (submodule_from_ce(ce)) { int ret = check_submodule_move_head(ce, oid_to_hex(&old->oid), oid_to_hex(&ce->oid), o); if (ret) return ret; } } else { /* * Previously unmerged entry left as an existence * marker by read_index_unmerged(); */ invalidate_ce_path(old, o); } do_add_entry(o, merge, update, CE_STAGEMASK); return 1; } static int deleted_entry(const struct cache_entry *ce, const struct cache_entry *old, struct unpack_trees_options *o) { /* Did it exist in the index? */ if (!old) { if (verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o)) return -1; return 0; } if (!(old->ce_flags & CE_CONFLICTED) && verify_uptodate(old, o)) return -1; add_entry(o, ce, CE_REMOVE, 0); invalidate_ce_path(ce, o); return 1; } static int keep_entry(const struct cache_entry *ce, struct unpack_trees_options *o) { add_entry(o, ce, 0, 0); if (ce_stage(ce)) invalidate_ce_path(ce, o); return 1; } #if DBRT_DEBUG static void show_stage_entry(FILE *o, const char *label, const struct cache_entry *ce) { if (!ce) fprintf(o, "%s (missing)\n", label); else fprintf(o, "%s%06o %s %d\t%s\n", label, ce->ce_mode, oid_to_hex(&ce->oid), ce_stage(ce), ce->name); } #endif int threeway_merge(const struct cache_entry * const *stages, struct unpack_trees_options *o) { const struct cache_entry *index; const struct cache_entry *head; const struct cache_entry *remote = stages[o->head_idx + 1]; int count; int head_match = 0; int remote_match = 0; int df_conflict_head = 0; int df_conflict_remote = 0; int any_anc_missing = 0; int no_anc_exists = 1; int i; for (i = 1; i < o->head_idx; i++) { if (!stages[i] || stages[i] == o->df_conflict_entry) any_anc_missing = 1; else no_anc_exists = 0; } index = stages[0]; head = stages[o->head_idx]; if (head == o->df_conflict_entry) { df_conflict_head = 1; head = NULL; } if (remote == o->df_conflict_entry) { df_conflict_remote = 1; remote = NULL; } /* * First, if there's a #16 situation, note that to prevent #13 * and #14. */ if (!same(remote, head)) { for (i = 1; i < o->head_idx; i++) { if (same(stages[i], head)) { head_match = i; } if (same(stages[i], remote)) { remote_match = i; } } } /* * We start with cases where the index is allowed to match * something other than the head: #14(ALT) and #2ALT, where it * is permitted to match the result instead. */ /* #14, #14ALT, #2ALT */ if (remote && !df_conflict_head && head_match && !remote_match) { if (index && !same(index, remote) && !same(index, head)) return reject_merge(index, o); return merged_entry(remote, index, o); } /* * If we have an entry in the index cache, then we want to * make sure that it matches head. */ if (index && !same(index, head)) return reject_merge(index, o); if (head) { /* #5ALT, #15 */ if (same(head, remote)) return merged_entry(head, index, o); /* #13, #3ALT */ if (!df_conflict_remote && remote_match && !head_match) return merged_entry(head, index, o); } /* #1 */ if (!head && !remote && any_anc_missing) return 0; /* * Under the "aggressive" rule, we resolve mostly trivial * cases that we historically had git-merge-one-file resolve. */ if (o->aggressive) { int head_deleted = !head; int remote_deleted = !remote; const struct cache_entry *ce = NULL; if (index) ce = index; else if (head) ce = head; else if (remote) ce = remote; else { for (i = 1; i < o->head_idx; i++) { if (stages[i] && stages[i] != o->df_conflict_entry) { ce = stages[i]; break; } } } /* * Deleted in both. * Deleted in one and unchanged in the other. */ if ((head_deleted && remote_deleted) || (head_deleted && remote && remote_match) || (remote_deleted && head && head_match)) { if (index) return deleted_entry(index, index, o); if (ce && !head_deleted) { if (verify_absent(ce, ERROR_WOULD_LOSE_UNTRACKED_REMOVED, o)) return -1; } return 0; } /* * Added in both, identically. */ if (no_anc_exists && head && remote && same(head, remote)) return merged_entry(head, index, o); } /* Below are "no merge" cases, which require that the index be * up-to-date to avoid the files getting overwritten with * conflict resolution files. */ if (index) { if (verify_uptodate(index, o)) return -1; } o->nontrivial_merge = 1; /* #2, #3, #4, #6, #7, #9, #10, #11. */ count = 0; if (!head_match || !remote_match) { for (i = 1; i < o->head_idx; i++) { if (stages[i] && stages[i] != o->df_conflict_entry) { keep_entry(stages[i], o); count++; break; } } } #if DBRT_DEBUG else { fprintf(stderr, "read-tree: warning #16 detected\n"); show_stage_entry(stderr, "head ", stages[head_match]); show_stage_entry(stderr, "remote ", stages[remote_match]); } #endif if (head) { count += keep_entry(head, o); } if (remote) { count += keep_entry(remote, o); } return count; } /* * Two-way merge. * * The rule is to "carry forward" what is in the index without losing * information across a "fast-forward", favoring a successful merge * over a merge failure when it makes sense. For details of the * "carry forward" rule, please see . * */ int twoway_merge(const struct cache_entry * const *src, struct unpack_trees_options *o) { const struct cache_entry *current = src[0]; const struct cache_entry *oldtree = src[1]; const struct cache_entry *newtree = src[2]; if (o->merge_size != 2) return error("Cannot do a twoway merge of %d trees", o->merge_size); if (oldtree == o->df_conflict_entry) oldtree = NULL; if (newtree == o->df_conflict_entry) newtree = NULL; if (current) { if (current->ce_flags & CE_CONFLICTED) { if (same(oldtree, newtree) || o->reset) { if (!newtree) return deleted_entry(current, current, o); else return merged_entry(newtree, current, o); } return reject_merge(current, o); } else if ((!oldtree && !newtree) || /* 4 and 5 */ (!oldtree && newtree && same(current, newtree)) || /* 6 and 7 */ (oldtree && newtree && same(oldtree, newtree)) || /* 14 and 15 */ (oldtree && newtree && !same(oldtree, newtree) && /* 18 and 19 */ same(current, newtree))) { return keep_entry(current, o); } else if (oldtree && !newtree && same(current, oldtree)) { /* 10 or 11 */ return deleted_entry(oldtree, current, o); } else if (oldtree && newtree && same(current, oldtree) && !same(current, newtree)) { /* 20 or 21 */ return merged_entry(newtree, current, o); } else return reject_merge(current, o); } else if (newtree) { if (oldtree && !o->initial_checkout) { /* * deletion of the path was staged; */ if (same(oldtree, newtree)) return 1; return reject_merge(oldtree, o); } return merged_entry(newtree, current, o); } return deleted_entry(oldtree, current, o); } /* * Bind merge. * * Keep the index entries at stage0, collapse stage1 but make sure * stage0 does not have anything there. */ int bind_merge(const struct cache_entry * const *src, struct unpack_trees_options *o) { const struct cache_entry *old = src[0]; const struct cache_entry *a = src[1]; if (o->merge_size != 1) return error("Cannot do a bind merge of %d trees", o->merge_size); if (a && old) return o->quiet ? -1 : error(ERRORMSG(o, ERROR_BIND_OVERLAP), super_prefixed(a->name), super_prefixed(old->name)); if (!a) return keep_entry(old, o); else return merged_entry(a, NULL, o); } /* * One-way merge. * * The rule is: * - take the stat information from stage0, take the data from stage1 */ int oneway_merge(const struct cache_entry * const *src, struct unpack_trees_options *o) { const struct cache_entry *old = src[0]; const struct cache_entry *a = src[1]; if (o->merge_size != 1) return error("Cannot do a oneway merge of %d trees", o->merge_size); if (!a || a == o->df_conflict_entry) return deleted_entry(old, old, o); if (old && same(old, a)) { int update = 0; if (o->reset && o->update && !ce_uptodate(old) && !ce_skip_worktree(old)) { struct stat st; if (lstat(old->name, &st) || ie_match_stat(o->src_index, old, &st, CE_MATCH_IGNORE_VALID|CE_MATCH_IGNORE_SKIP_WORKTREE)) update |= CE_UPDATE; } if (o->update && S_ISGITLINK(old->ce_mode) && should_update_submodules() && !verify_uptodate(old, o)) update |= CE_UPDATE; add_entry(o, old, update, CE_STAGEMASK); return 0; } return merged_entry(a, old, o); }