diff options
Diffstat (limited to 'third_party/git/unpack-trees.c')
| -rw-r--r-- | third_party/git/unpack-trees.c | 2390 |
1 files changed, 0 insertions, 2390 deletions
diff --git a/third_party/git/unpack-trees.c b/third_party/git/unpack-trees.c deleted file mode 100644 index 62276d4fef..0000000000 --- a/third_party/git/unpack-trees.c +++ /dev/null @@ -1,2390 +0,0 @@ -#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 "dir.h" -#include "submodule.h" -#include "submodule-config.h" -#include "fsmonitor.h" -#include "object-store.h" -#include "fetch-object.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 <path> - * corresponding to the type <e> with the message <msg> - * 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 (repository_format_partial_clone && 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) - fetch_objects(repository_format_partial_clone, - 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 struct name_entry *); - -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); - - 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; - int len = traverse_path_len(info, names); - char *name = xmalloc(len + 1 /* slash */ + 1 /* NUL */); - int pos; - - make_traverse_path(name, info, names); - name[len++] = '/'; - name[len] = '\0'; - pos = index_name_pos(o->src_index, 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) || - (pos > 0 && starts_with(o->src_index->cache[pos-1]->name, name))) - BUG("pos must point at the first entry in this directory"); - free(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; - 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 struct name_entry *n) -{ - int len, pathlen, ce_len; - const char *ce_name; - - if (info->prev) { - int cmp = do_compare_entry_piecewise(ce, info->prev, - &info->name); - 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; - - len = tree_entry_len(n); - return df_name_compare(ce_name, ce_len, S_IFREG, n->path, len, n->mode); -} - -static int do_compare_entry(const struct cache_entry *ce, - const struct traverse_info *info, - const struct name_entry *n) -{ - int len, 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, n); - - 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; - - len = tree_entry_len(n); - return df_name_compare(ce_name, ce_len, S_IFREG, n->path, len, n->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); - 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, 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)) - 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) -{ - int len = traverse_path_len(info, 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); - make_traverse_path(ce->name, info, n); - - 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 struct name_entry *p) -{ - int pos; - struct unpack_trees_options *o = info->data; - struct index_state *index = o->src_index; - int pfxlen = info->pathlen; - int p_len = tree_entry_len(p); - - 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->path, 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->path, 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); - 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.path) - putchar('/'); - } - printf("%s", info->name.path); -} - -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 exclude_list *el, int defval); - -/* 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 exclude_list *el, int defval) -{ - struct cache_entry **cache_end; - int dtype = DT_DIR; - int ret = is_excluded_from_list(prefix->buf, prefix->len, - basename, &dtype, el, istate); - int rc; - - strbuf_addch(prefix, '/'); - - /* If undecided, use matching result of parent dir in defval */ - if (ret < 0) - ret = defval; - - 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; - } - - /* - * TODO: check el, if there are no patterns that may conflict - * with ret (iow, we know in advance the incl/excl - * decision for the entire directory), clear flag here without - * calling clear_ce_flags_1(). That function will call - * the expensive is_excluded_from_list() on every entry. - */ - rc = clear_ce_flags_1(istate, cache, cache_end - cache, - prefix, - select_mask, clear_mask, - el, ret); - strbuf_setlen(prefix, prefix->len - 1); - return rc; -} - -/* - * Traverse the index, find every entry that matches according to - * o->el. 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 exclude_list *el, int defval) -{ - 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, ret; - - if (select_mask && !(ce->ce_flags & select_mask)) { - cache++; - 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, - el, defval); - - /* clear_c_f_dir eats a whole dir already? */ - if (processed) { - cache += processed; - strbuf_setlen(prefix, prefix->len - len); - continue; - } - - strbuf_addch(prefix, '/'); - cache += clear_ce_flags_1(istate, cache, cache_end - cache, - prefix, - select_mask, clear_mask, el, defval); - strbuf_setlen(prefix, prefix->len - len - 1); - continue; - } - - /* Non-directory */ - dtype = ce_to_dtype(ce); - ret = is_excluded_from_list(ce->name, ce_namelen(ce), - name, &dtype, el, istate); - if (ret < 0) - ret = defval; - if (ret > 0) - ce->ce_flags &= ~clear_mask; - cache++; - } - return nr - (cache_end - cache); -} - -static int clear_ce_flags(struct index_state *istate, - int select_mask, int clear_mask, - struct exclude_list *el) -{ - static struct strbuf prefix = STRBUF_INIT; - - strbuf_reset(&prefix); - - return clear_ce_flags_1(istate, - istate->cache, - istate->cache_nr, - &prefix, - select_mask, clear_mask, - el, 0); -} - -/* - * Set/Clear CE_NEW_SKIP_WORKTREE according to $GIT_DIR/info/sparse-checkout - */ -static void mark_new_skip_worktree(struct exclude_list *el, - struct index_state *istate, - int select_flag, int skip_wt_flag) -{ - 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, el); -} - -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 exclude_list el; - - if (len > MAX_UNPACK_TREES) - die("unpack_trees takes at most %d trees", MAX_UNPACK_TREES); - - trace_performance_enter(); - memset(&el, 0, sizeof(el)); - if (!core_apply_sparse_checkout || !o->update) - o->skip_sparse_checkout = 1; - if (!o->skip_sparse_checkout) { - char *sparse = git_pathdup("info/sparse-checkout"); - if (add_excludes_from_file_to_list(sparse, "", 0, &el, NULL) < 0) - o->skip_sparse_checkout = 1; - else - o->el = ⪙ - 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->el, o->src_index, 0, CE_NEW_SKIP_WORKTREE); - - 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->el, &o->result, CE_ADDED, CE_SKIP_WORKTREE | CE_NEW_SKIP_WORKTREE); - - 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"); - clear_exclude_list(&el); - 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 <Documentation/git-read-tree.txt>. - * - */ -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); -} |