/* * Recursive Merge algorithm stolen from git-merge-recursive.py by * Fredrik Kuivinen. * The thieves were Alex Riesen and Johannes Schindelin, in June/July 2006 */ #include "cache.h" #include "config.h" #include "advice.h" #include "lockfile.h" #include "cache-tree.h" #include "commit.h" #include "blob.h" #include "builtin.h" #include "tree-walk.h" #include "diff.h" #include "diffcore.h" #include "tag.h" #include "unpack-trees.h" #include "string-list.h" #include "xdiff-interface.h" #include "ll-merge.h" #include "attr.h" #include "merge-recursive.h" #include "dir.h" #include "submodule.h" #include "revision.h" struct path_hashmap_entry { struct hashmap_entry e; char path[FLEX_ARRAY]; }; static int path_hashmap_cmp(const void *cmp_data, const void *entry, const void *entry_or_key, const void *keydata) { const struct path_hashmap_entry *a = entry; const struct path_hashmap_entry *b = entry_or_key; const char *key = keydata; if (ignore_case) return strcasecmp(a->path, key ? key : b->path); else return strcmp(a->path, key ? key : b->path); } static unsigned int path_hash(const char *path) { return ignore_case ? strihash(path) : strhash(path); } static void flush_output(struct merge_options *o) { if (o->buffer_output < 2 && o->obuf.len) { fputs(o->obuf.buf, stdout); strbuf_reset(&o->obuf); } } static int err(struct merge_options *o, const char *err, ...) { va_list params; if (o->buffer_output < 2) flush_output(o); else { strbuf_complete(&o->obuf, '\n'); strbuf_addstr(&o->obuf, "error: "); } va_start(params, err); strbuf_vaddf(&o->obuf, err, params); va_end(params); if (o->buffer_output > 1) strbuf_addch(&o->obuf, '\n'); else { error("%s", o->obuf.buf); strbuf_reset(&o->obuf); } return -1; } static struct tree *shift_tree_object(struct tree *one, struct tree *two, const char *subtree_shift) { struct object_id shifted; if (!*subtree_shift) { shift_tree(&one->object.oid, &two->object.oid, &shifted, 0); } else { shift_tree_by(&one->object.oid, &two->object.oid, &shifted, subtree_shift); } if (!oidcmp(&two->object.oid, &shifted)) return two; return lookup_tree(&shifted); } static struct commit *make_virtual_commit(struct tree *tree, const char *comment) { struct commit *commit = alloc_commit_node(); set_merge_remote_desc(commit, comment, (struct object *)commit); commit->tree = tree; commit->object.parsed = 1; return commit; } /* * Since we use get_tree_entry(), which does not put the read object into * the object pool, we cannot rely on a == b. */ static int oid_eq(const struct object_id *a, const struct object_id *b) { if (!a && !b) return 2; return a && b && oidcmp(a, b) == 0; } enum rename_type { RENAME_NORMAL = 0, RENAME_DELETE, RENAME_ONE_FILE_TO_ONE, RENAME_ONE_FILE_TO_TWO, RENAME_TWO_FILES_TO_ONE }; struct rename_conflict_info { enum rename_type rename_type; struct diff_filepair *pair1; struct diff_filepair *pair2; const char *branch1; const char *branch2; struct stage_data *dst_entry1; struct stage_data *dst_entry2; struct diff_filespec ren1_other; struct diff_filespec ren2_other; }; /* * Since we want to write the index eventually, we cannot reuse the index * for these (temporary) data. */ struct stage_data { struct { unsigned mode; struct object_id oid; } stages[4]; struct rename_conflict_info *rename_conflict_info; unsigned processed:1; }; static inline void setup_rename_conflict_info(enum rename_type rename_type, struct diff_filepair *pair1, struct diff_filepair *pair2, const char *branch1, const char *branch2, struct stage_data *dst_entry1, struct stage_data *dst_entry2, struct merge_options *o, struct stage_data *src_entry1, struct stage_data *src_entry2) { struct rename_conflict_info *ci = xcalloc(1, sizeof(struct rename_conflict_info)); ci->rename_type = rename_type; ci->pair1 = pair1; ci->branch1 = branch1; ci->branch2 = branch2; ci->dst_entry1 = dst_entry1; dst_entry1->rename_conflict_info = ci; dst_entry1->processed = 0; assert(!pair2 == !dst_entry2); if (dst_entry2) { ci->dst_entry2 = dst_entry2; ci->pair2 = pair2; dst_entry2->rename_conflict_info = ci; } if (rename_type == RENAME_TWO_FILES_TO_ONE) { /* * For each rename, there could have been * modifications on the side of history where that * file was not renamed. */ int ostage1 = o->branch1 == branch1 ? 3 : 2; int ostage2 = ostage1 ^ 1; ci->ren1_other.path = pair1->one->path; oidcpy(&ci->ren1_other.oid, &src_entry1->stages[ostage1].oid); ci->ren1_other.mode = src_entry1->stages[ostage1].mode; ci->ren2_other.path = pair2->one->path; oidcpy(&ci->ren2_other.oid, &src_entry2->stages[ostage2].oid); ci->ren2_other.mode = src_entry2->stages[ostage2].mode; } } static int show(struct merge_options *o, int v) { return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5; } __attribute__((format (printf, 3, 4))) static void output(struct merge_options *o, int v, const char *fmt, ...) { va_list ap; if (!show(o, v)) return; strbuf_addchars(&o->obuf, ' ', o->call_depth * 2); va_start(ap, fmt); strbuf_vaddf(&o->obuf, fmt, ap); va_end(ap); strbuf_addch(&o->obuf, '\n'); if (!o->buffer_output) flush_output(o); } static void output_commit_title(struct merge_options *o, struct commit *commit) { strbuf_addchars(&o->obuf, ' ', o->call_depth * 2); if (commit->util) strbuf_addf(&o->obuf, "virtual %s\n", merge_remote_util(commit)->name); else { strbuf_add_unique_abbrev(&o->obuf, &commit->object.oid, DEFAULT_ABBREV); strbuf_addch(&o->obuf, ' '); if (parse_commit(commit) != 0) strbuf_addstr(&o->obuf, _("(bad commit)\n")); else { const char *title; const char *msg = get_commit_buffer(commit, NULL); int len = find_commit_subject(msg, &title); if (len) strbuf_addf(&o->obuf, "%.*s\n", len, title); unuse_commit_buffer(commit, msg); } } flush_output(o); } static int add_cacheinfo(struct merge_options *o, unsigned int mode, const struct object_id *oid, const char *path, int stage, int refresh, int options) { struct cache_entry *ce; int ret; ce = make_cache_entry(mode, oid ? oid->hash : null_sha1, path, stage, 0); if (!ce) return err(o, _("addinfo_cache failed for path '%s'"), path); ret = add_cache_entry(ce, options); if (refresh) { struct cache_entry *nce; nce = refresh_cache_entry(ce, CE_MATCH_REFRESH | CE_MATCH_IGNORE_MISSING); if (!nce) return err(o, _("addinfo_cache failed for path '%s'"), path); if (nce != ce) ret = add_cache_entry(nce, options); } return ret; } static void init_tree_desc_from_tree(struct tree_desc *desc, struct tree *tree) { parse_tree(tree); init_tree_desc(desc, tree->buffer, tree->size); } static int git_merge_trees(int index_only, struct tree *common, struct tree *head, struct tree *merge) { int rc; struct tree_desc t[3]; struct unpack_trees_options opts; memset(&opts, 0, sizeof(opts)); if (index_only) opts.index_only = 1; else opts.update = 1; opts.merge = 1; opts.head_idx = 2; opts.fn = threeway_merge; opts.src_index = &the_index; opts.dst_index = &the_index; setup_unpack_trees_porcelain(&opts, "merge"); init_tree_desc_from_tree(t+0, common); init_tree_desc_from_tree(t+1, head); init_tree_desc_from_tree(t+2, merge); rc = unpack_trees(3, t, &opts); cache_tree_free(&active_cache_tree); return rc; } struct tree *write_tree_from_memory(struct merge_options *o) { struct tree *result = NULL; if (unmerged_cache()) { int i; fprintf(stderr, "BUG: There are unmerged index entries:\n"); for (i = 0; i < active_nr; i++) { const struct cache_entry *ce = active_cache[i]; if (ce_stage(ce)) fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce), (int)ce_namelen(ce), ce->name); } die("BUG: unmerged index entries in merge-recursive.c"); } if (!active_cache_tree) active_cache_tree = cache_tree(); if (!cache_tree_fully_valid(active_cache_tree) && cache_tree_update(&the_index, 0) < 0) { err(o, _("error building trees")); return NULL; } result = lookup_tree(&active_cache_tree->oid); return result; } static int save_files_dirs(const struct object_id *oid, struct strbuf *base, const char *path, unsigned int mode, int stage, void *context) { struct path_hashmap_entry *entry; int baselen = base->len; struct merge_options *o = context; strbuf_addstr(base, path); FLEX_ALLOC_MEM(entry, path, base->buf, base->len); hashmap_entry_init(entry, path_hash(entry->path)); hashmap_add(&o->current_file_dir_set, entry); strbuf_setlen(base, baselen); return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0); } static void get_files_dirs(struct merge_options *o, struct tree *tree) { struct pathspec match_all; memset(&match_all, 0, sizeof(match_all)); read_tree_recursive(tree, "", 0, 0, &match_all, save_files_dirs, o); } /* * Returns an index_entry instance which doesn't have to correspond to * a real cache entry in Git's index. */ static struct stage_data *insert_stage_data(const char *path, struct tree *o, struct tree *a, struct tree *b, struct string_list *entries) { struct string_list_item *item; struct stage_data *e = xcalloc(1, sizeof(struct stage_data)); get_tree_entry(&o->object.oid, path, &e->stages[1].oid, &e->stages[1].mode); get_tree_entry(&a->object.oid, path, &e->stages[2].oid, &e->stages[2].mode); get_tree_entry(&b->object.oid, path, &e->stages[3].oid, &e->stages[3].mode); item = string_list_insert(entries, path); item->util = e; return e; } /* * Create a dictionary mapping file names to stage_data objects. The * dictionary contains one entry for every path with a non-zero stage entry. */ static struct string_list *get_unmerged(void) { struct string_list *unmerged = xcalloc(1, sizeof(struct string_list)); int i; unmerged->strdup_strings = 1; for (i = 0; i < active_nr; i++) { struct string_list_item *item; struct stage_data *e; const struct cache_entry *ce = active_cache[i]; if (!ce_stage(ce)) continue; item = string_list_lookup(unmerged, ce->name); if (!item) { item = string_list_insert(unmerged, ce->name); item->util = xcalloc(1, sizeof(struct stage_data)); } e = item->util; e->stages[ce_stage(ce)].mode = ce->ce_mode; oidcpy(&e->stages[ce_stage(ce)].oid, &ce->oid); } return unmerged; } static int string_list_df_name_compare(const char *one, const char *two) { int onelen = strlen(one); int twolen = strlen(two); /* * Here we only care that entries for D/F conflicts are * adjacent, in particular with the file of the D/F conflict * appearing before files below the corresponding directory. * The order of the rest of the list is irrelevant for us. * * To achieve this, we sort with df_name_compare and provide * the mode S_IFDIR so that D/F conflicts will sort correctly. * We use the mode S_IFDIR for everything else for simplicity, * since in other cases any changes in their order due to * sorting cause no problems for us. */ int cmp = df_name_compare(one, onelen, S_IFDIR, two, twolen, S_IFDIR); /* * Now that 'foo' and 'foo/bar' compare equal, we have to make sure * that 'foo' comes before 'foo/bar'. */ if (cmp) return cmp; return onelen - twolen; } static void record_df_conflict_files(struct merge_options *o, struct string_list *entries) { /* If there is a D/F conflict and the file for such a conflict * currently exist in the working tree, we want to allow it to be * removed to make room for the corresponding directory if needed. * The files underneath the directories of such D/F conflicts will * be processed before the corresponding file involved in the D/F * conflict. If the D/F directory ends up being removed by the * merge, then we won't have to touch the D/F file. If the D/F * directory needs to be written to the working copy, then the D/F * file will simply be removed (in make_room_for_path()) to make * room for the necessary paths. Note that if both the directory * and the file need to be present, then the D/F file will be * reinstated with a new unique name at the time it is processed. */ struct string_list df_sorted_entries = STRING_LIST_INIT_NODUP; const char *last_file = NULL; int last_len = 0; int i; /* * If we're merging merge-bases, we don't want to bother with * any working directory changes. */ if (o->call_depth) return; /* Ensure D/F conflicts are adjacent in the entries list. */ for (i = 0; i < entries->nr; i++) { struct string_list_item *next = &entries->items[i]; string_list_append(&df_sorted_entries, next->string)->util = next->util; } df_sorted_entries.cmp = string_list_df_name_compare; string_list_sort(&df_sorted_entries); string_list_clear(&o->df_conflict_file_set, 1); for (i = 0; i < df_sorted_entries.nr; i++) { const char *path = df_sorted_entries.items[i].string; int len = strlen(path); struct stage_data *e = df_sorted_entries.items[i].util; /* * Check if last_file & path correspond to a D/F conflict; * i.e. whether path is last_file+'/'+. * If so, record that it's okay to remove last_file to make * room for path and friends if needed. */ if (last_file && len > last_len && memcmp(path, last_file, last_len) == 0 && path[last_len] == '/') { string_list_insert(&o->df_conflict_file_set, last_file); } /* * Determine whether path could exist as a file in the * working directory as a possible D/F conflict. This * will only occur when it exists in stage 2 as a * file. */ if (S_ISREG(e->stages[2].mode) || S_ISLNK(e->stages[2].mode)) { last_file = path; last_len = len; } else { last_file = NULL; } } string_list_clear(&df_sorted_entries, 0); } struct rename { struct diff_filepair *pair; /* * Purpose of src_entry and dst_entry: * * If 'before' is renamed to 'after' then src_entry will contain * the versions of 'before' from the merge_base, HEAD, and MERGE in * stages 1, 2, and 3; dst_entry will contain the respective * versions of 'after' in corresponding locations. Thus, we have a * total of six modes and oids, though some will be null. (Stage 0 * is ignored; we're interested in handling conflicts.) * * Since we don't turn on break-rewrites by default, neither * src_entry nor dst_entry can have all three of their stages have * non-null oids, meaning at most four of the six will be non-null. * Also, since this is a rename, both src_entry and dst_entry will * have at least one non-null oid, meaning at least two will be * non-null. Of the six oids, a typical rename will have three be * non-null. Only two implies a rename/delete, and four implies a * rename/add. */ struct stage_data *src_entry; struct stage_data *dst_entry; unsigned processed:1; }; /* * Get information of all renames which occurred between 'o_tree' and * 'tree'. We need the three trees in the merge ('o_tree', 'a_tree' and * 'b_tree') to be able to associate the correct cache entries with * the rename information. 'tree' is always equal to either a_tree or b_tree. */ static struct string_list *get_renames(struct merge_options *o, struct tree *tree, struct tree *o_tree, struct tree *a_tree, struct tree *b_tree, struct string_list *entries) { int i; struct string_list *renames; struct diff_options opts; renames = xcalloc(1, sizeof(struct string_list)); if (!o->detect_rename) return renames; diff_setup(&opts); opts.flags.recursive = 1; opts.flags.rename_empty = 0; opts.detect_rename = DIFF_DETECT_RENAME; opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit : o->diff_rename_limit >= 0 ? o->diff_rename_limit : 1000; opts.rename_score = o->rename_score; opts.show_rename_progress = o->show_rename_progress; opts.output_format = DIFF_FORMAT_NO_OUTPUT; diff_setup_done(&opts); diff_tree_oid(&o_tree->object.oid, &tree->object.oid, "", &opts); diffcore_std(&opts); if (opts.needed_rename_limit > o->needed_rename_limit) o->needed_rename_limit = opts.needed_rename_limit; for (i = 0; i < diff_queued_diff.nr; ++i) { struct string_list_item *item; struct rename *re; struct diff_filepair *pair = diff_queued_diff.queue[i]; if (pair->status != 'R') { diff_free_filepair(pair); continue; } re = xmalloc(sizeof(*re)); re->processed = 0; re->pair = pair; item = string_list_lookup(entries, re->pair->one->path); if (!item) re->src_entry = insert_stage_data(re->pair->one->path, o_tree, a_tree, b_tree, entries); else re->src_entry = item->util; item = string_list_lookup(entries, re->pair->two->path); if (!item) re->dst_entry = insert_stage_data(re->pair->two->path, o_tree, a_tree, b_tree, entries); else re->dst_entry = item->util; item = string_list_insert(renames, pair->one->path); item->util = re; } opts.output_format = DIFF_FORMAT_NO_OUTPUT; diff_queued_diff.nr = 0; diff_flush(&opts); return renames; } static int update_stages(struct merge_options *opt, const char *path, const struct diff_filespec *o, const struct diff_filespec *a, const struct diff_filespec *b) { /* * NOTE: It is usually a bad idea to call update_stages on a path * before calling update_file on that same path, since it can * sometimes lead to spurious "refusing to lose untracked file..." * messages from update_file (via make_room_for path via * would_lose_untracked). Instead, reverse the order of the calls * (executing update_file first and then update_stages). */ int clear = 1; int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_SKIP_DFCHECK; if (clear) if (remove_file_from_cache(path)) return -1; if (o) if (add_cacheinfo(opt, o->mode, &o->oid, path, 1, 0, options)) return -1; if (a) if (add_cacheinfo(opt, a->mode, &a->oid, path, 2, 0, options)) return -1; if (b) if (add_cacheinfo(opt, b->mode, &b->oid, path, 3, 0, options)) return -1; return 0; } static void update_entry(struct stage_data *entry, struct diff_filespec *o, struct diff_filespec *a, struct diff_filespec *b) { entry->processed = 0; entry->stages[1].mode = o->mode; entry->stages[2].mode = a->mode; entry->stages[3].mode = b->mode; oidcpy(&entry->stages[1].oid, &o->oid); oidcpy(&entry->stages[2].oid, &a->oid); oidcpy(&entry->stages[3].oid, &b->oid); } static int remove_file(struct merge_options *o, int clean, const char *path, int no_wd) { int update_cache = o->call_depth || clean; int update_working_directory = !o->call_depth && !no_wd; if (update_cache) { if (remove_file_from_cache(path)) return -1; } if (update_working_directory) { if (ignore_case) { struct cache_entry *ce; ce = cache_file_exists(path, strlen(path), ignore_case); if (ce && ce_stage(ce) == 0 && strcmp(path, ce->name)) return 0; } if (remove_path(path)) return -1; } return 0; } /* add a string to a strbuf, but converting "/" to "_" */ static void add_flattened_path(struct strbuf *out, const char *s) { size_t i = out->len; strbuf_addstr(out, s); for (; i < out->len; i++) if (out->buf[i] == '/') out->buf[i] = '_'; } static char *unique_path(struct merge_options *o, const char *path, const char *branch) { struct path_hashmap_entry *entry; struct strbuf newpath = STRBUF_INIT; int suffix = 0; size_t base_len; strbuf_addf(&newpath, "%s~", path); add_flattened_path(&newpath, branch); base_len = newpath.len; while (hashmap_get_from_hash(&o->current_file_dir_set, path_hash(newpath.buf), newpath.buf) || (!o->call_depth && file_exists(newpath.buf))) { strbuf_setlen(&newpath, base_len); strbuf_addf(&newpath, "_%d", suffix++); } FLEX_ALLOC_MEM(entry, path, newpath.buf, newpath.len); hashmap_entry_init(entry, path_hash(entry->path)); hashmap_add(&o->current_file_dir_set, entry); return strbuf_detach(&newpath, NULL); } /** * Check whether a directory in the index is in the way of an incoming * file. Return 1 if so. If check_working_copy is non-zero, also * check the working directory. If empty_ok is non-zero, also return * 0 in the case where the working-tree dir exists but is empty. */ static int dir_in_way(const char *path, int check_working_copy, int empty_ok) { int pos; struct strbuf dirpath = STRBUF_INIT; struct stat st; strbuf_addstr(&dirpath, path); strbuf_addch(&dirpath, '/'); pos = cache_name_pos(dirpath.buf, dirpath.len); if (pos < 0) pos = -1 - pos; if (pos < active_nr && !strncmp(dirpath.buf, active_cache[pos]->name, dirpath.len)) { strbuf_release(&dirpath); return 1; } strbuf_release(&dirpath); return check_working_copy && !lstat(path, &st) && S_ISDIR(st.st_mode) && !(empty_ok && is_empty_dir(path)); } static int was_tracked(const char *path) { int pos = cache_name_pos(path, strlen(path)); if (0 <= pos) /* we have been tracking this path */ return 1; /* * Look for an unmerged entry for the path, * specifically stage #2, which would indicate * that "our" side before the merge started * had the path tracked (and resulted in a conflict). */ for (pos = -1 - pos; pos < active_nr && !strcmp(path, active_cache[pos]->name); pos++) if (ce_stage(active_cache[pos]) == 2) return 1; return 0; } static int would_lose_untracked(const char *path) { return !was_tracked(path) && file_exists(path); } static int make_room_for_path(struct merge_options *o, const char *path) { int status, i; const char *msg = _("failed to create path '%s'%s"); /* Unlink any D/F conflict files that are in the way */ for (i = 0; i < o->df_conflict_file_set.nr; i++) { const char *df_path = o->df_conflict_file_set.items[i].string; size_t pathlen = strlen(path); size_t df_pathlen = strlen(df_path); if (df_pathlen < pathlen && path[df_pathlen] == '/' && strncmp(path, df_path, df_pathlen) == 0) { output(o, 3, _("Removing %s to make room for subdirectory\n"), df_path); unlink(df_path); unsorted_string_list_delete_item(&o->df_conflict_file_set, i, 0); break; } } /* Make sure leading directories are created */ status = safe_create_leading_directories_const(path); if (status) { if (status == SCLD_EXISTS) /* something else exists */ return err(o, msg, path, _(": perhaps a D/F conflict?")); return err(o, msg, path, ""); } /* * Do not unlink a file in the work tree if we are not * tracking it. */ if (would_lose_untracked(path)) return err(o, _("refusing to lose untracked file at '%s'"), path); /* Successful unlink is good.. */ if (!unlink(path)) return 0; /* .. and so is no existing file */ if (errno == ENOENT) return 0; /* .. but not some other error (who really cares what?) */ return err(o, msg, path, _(": perhaps a D/F conflict?")); } static int update_file_flags(struct merge_options *o, const struct object_id *oid, unsigned mode, const char *path, int update_cache, int update_wd) { int ret = 0; if (o->call_depth) update_wd = 0; if (update_wd) { enum object_type type; void *buf; unsigned long size; if (S_ISGITLINK(mode)) { /* * We may later decide to recursively descend into * the submodule directory and update its index * and/or work tree, but we do not do that now. */ update_wd = 0; goto update_index; } buf = read_object_file(oid, &type, &size); if (!buf) return err(o, _("cannot read object %s '%s'"), oid_to_hex(oid), path); if (type != OBJ_BLOB) { ret = err(o, _("blob expected for %s '%s'"), oid_to_hex(oid), path); goto free_buf; } if (S_ISREG(mode)) { struct strbuf strbuf = STRBUF_INIT; if (convert_to_working_tree(path, buf, size, &strbuf)) { free(buf); size = strbuf.len; buf = strbuf_detach(&strbuf, NULL); } } if (make_room_for_path(o, path) < 0) { update_wd = 0; goto free_buf; } if (S_ISREG(mode) || (!has_symlinks && S_ISLNK(mode))) { int fd; if (mode & 0100) mode = 0777; else mode = 0666; fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, mode); if (fd < 0) { ret = err(o, _("failed to open '%s': %s"), path, strerror(errno)); goto free_buf; } write_in_full(fd, buf, size); close(fd); } else if (S_ISLNK(mode)) { char *lnk = xmemdupz(buf, size); safe_create_leading_directories_const(path); unlink(path); if (symlink(lnk, path)) ret = err(o, _("failed to symlink '%s': %s"), path, strerror(errno)); free(lnk); } else ret = err(o, _("do not know what to do with %06o %s '%s'"), mode, oid_to_hex(oid), path); free_buf: free(buf); } update_index: if (!ret && update_cache) add_cacheinfo(o, mode, oid, path, 0, update_wd, ADD_CACHE_OK_TO_ADD); return ret; } static int update_file(struct merge_options *o, int clean, const struct object_id *oid, unsigned mode, const char *path) { return update_file_flags(o, oid, mode, path, o->call_depth || clean, !o->call_depth); } /* Low level file merging, update and removal */ struct merge_file_info { struct object_id oid; unsigned mode; unsigned clean:1, merge:1; }; static int merge_3way(struct merge_options *o, mmbuffer_t *result_buf, const struct diff_filespec *one, const struct diff_filespec *a, const struct diff_filespec *b, const char *branch1, const char *branch2) { mmfile_t orig, src1, src2; struct ll_merge_options ll_opts = {0}; char *base_name, *name1, *name2; int merge_status; ll_opts.renormalize = o->renormalize; ll_opts.xdl_opts = o->xdl_opts; if (o->call_depth) { ll_opts.virtual_ancestor = 1; ll_opts.variant = 0; } else { switch (o->recursive_variant) { case MERGE_RECURSIVE_OURS: ll_opts.variant = XDL_MERGE_FAVOR_OURS; break; case MERGE_RECURSIVE_THEIRS: ll_opts.variant = XDL_MERGE_FAVOR_THEIRS; break; default: ll_opts.variant = 0; break; } } if (strcmp(a->path, b->path) || (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) { base_name = o->ancestor == NULL ? NULL : mkpathdup("%s:%s", o->ancestor, one->path); name1 = mkpathdup("%s:%s", branch1, a->path); name2 = mkpathdup("%s:%s", branch2, b->path); } else { base_name = o->ancestor == NULL ? NULL : mkpathdup("%s", o->ancestor); name1 = mkpathdup("%s", branch1); name2 = mkpathdup("%s", branch2); } read_mmblob(&orig, &one->oid); read_mmblob(&src1, &a->oid); read_mmblob(&src2, &b->oid); merge_status = ll_merge(result_buf, a->path, &orig, base_name, &src1, name1, &src2, name2, &ll_opts); free(base_name); free(name1); free(name2); free(orig.ptr); free(src1.ptr); free(src2.ptr); return merge_status; } static int find_first_merges(struct object_array *result, const char *path, struct commit *a, struct commit *b) { int i, j; struct object_array merges = OBJECT_ARRAY_INIT; struct commit *commit; int contains_another; char merged_revision[42]; const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path", "--all", merged_revision, NULL }; struct rev_info revs; struct setup_revision_opt rev_opts; memset(result, 0, sizeof(struct object_array)); memset(&rev_opts, 0, sizeof(rev_opts)); /* get all revisions that merge commit a */ xsnprintf(merged_revision, sizeof(merged_revision), "^%s", oid_to_hex(&a->object.oid)); init_revisions(&revs, NULL); rev_opts.submodule = path; /* FIXME: can't handle linked worktrees in submodules yet */ revs.single_worktree = path != NULL; setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts); /* save all revisions from the above list that contain b */ if (prepare_revision_walk(&revs)) die("revision walk setup failed"); while ((commit = get_revision(&revs)) != NULL) { struct object *o = &(commit->object); if (in_merge_bases(b, commit)) add_object_array(o, NULL, &merges); } reset_revision_walk(); /* Now we've got all merges that contain a and b. Prune all * merges that contain another found merge and save them in * result. */ for (i = 0; i < merges.nr; i++) { struct commit *m1 = (struct commit *) merges.objects[i].item; contains_another = 0; for (j = 0; j < merges.nr; j++) { struct commit *m2 = (struct commit *) merges.objects[j].item; if (i != j && in_merge_bases(m2, m1)) { contains_another = 1; break; } } if (!contains_another) add_object_array(merges.objects[i].item, NULL, result); } object_array_clear(&merges); return result->nr; } static void print_commit(struct commit *commit) { struct strbuf sb = STRBUF_INIT; struct pretty_print_context ctx = {0}; ctx.date_mode.type = DATE_NORMAL; format_commit_message(commit, " %h: %m %s", &sb, &ctx); fprintf(stderr, "%s\n", sb.buf); strbuf_release(&sb); } #define MERGE_WARNING(path, msg) \ warning("Failed to merge submodule %s (%s)", path, msg); static int merge_submodule(struct object_id *result, const char *path, const struct object_id *base, const struct object_id *a, const struct object_id *b, int search) { struct commit *commit_base, *commit_a, *commit_b; int parent_count; struct object_array merges; int i; /* store a in result in case we fail */ oidcpy(result, a); /* we can not handle deletion conflicts */ if (is_null_oid(base)) return 0; if (is_null_oid(a)) return 0; if (is_null_oid(b)) return 0; if (add_submodule_odb(path)) { MERGE_WARNING(path, "not checked out"); return 0; } if (!(commit_base = lookup_commit_reference(base)) || !(commit_a = lookup_commit_reference(a)) || !(commit_b = lookup_commit_reference(b))) { MERGE_WARNING(path, "commits not present"); return 0; } /* check whether both changes are forward */ if (!in_merge_bases(commit_base, commit_a) || !in_merge_bases(commit_base, commit_b)) { MERGE_WARNING(path, "commits don't follow merge-base"); return 0; } /* Case #1: a is contained in b or vice versa */ if (in_merge_bases(commit_a, commit_b)) { oidcpy(result, b); return 1; } if (in_merge_bases(commit_b, commit_a)) { oidcpy(result, a); return 1; } /* * Case #2: There are one or more merges that contain a and b in * the submodule. If there is only one, then present it as a * suggestion to the user, but leave it marked unmerged so the * user needs to confirm the resolution. */ /* Skip the search if makes no sense to the calling context. */ if (!search) return 0; /* find commit which merges them */ parent_count = find_first_merges(&merges, path, commit_a, commit_b); switch (parent_count) { case 0: MERGE_WARNING(path, "merge following commits not found"); break; case 1: MERGE_WARNING(path, "not fast-forward"); fprintf(stderr, "Found a possible merge resolution " "for the submodule:\n"); print_commit((struct commit *) merges.objects[0].item); fprintf(stderr, "If this is correct simply add it to the index " "for example\n" "by using:\n\n" " git update-index --cacheinfo 160000 %s \"%s\"\n\n" "which will accept this suggestion.\n", oid_to_hex(&merges.objects[0].item->oid), path); break; default: MERGE_WARNING(path, "multiple merges found"); for (i = 0; i < merges.nr; i++) print_commit((struct commit *) merges.objects[i].item); } object_array_clear(&merges); return 0; } static int merge_file_1(struct merge_options *o, const struct diff_filespec *one, const struct diff_filespec *a, const struct diff_filespec *b, const char *branch1, const char *branch2, struct merge_file_info *result) { result->merge = 0; result->clean = 1; if ((S_IFMT & a->mode) != (S_IFMT & b->mode)) { result->clean = 0; if (S_ISREG(a->mode)) { result->mode = a->mode; oidcpy(&result->oid, &a->oid); } else { result->mode = b->mode; oidcpy(&result->oid, &b->oid); } } else { if (!oid_eq(&a->oid, &one->oid) && !oid_eq(&b->oid, &one->oid)) result->merge = 1; /* * Merge modes */ if (a->mode == b->mode || a->mode == one->mode) result->mode = b->mode; else { result->mode = a->mode; if (b->mode != one->mode) { result->clean = 0; result->merge = 1; } } if (oid_eq(&a->oid, &b->oid) || oid_eq(&a->oid, &one->oid)) oidcpy(&result->oid, &b->oid); else if (oid_eq(&b->oid, &one->oid)) oidcpy(&result->oid, &a->oid); else if (S_ISREG(a->mode)) { mmbuffer_t result_buf; int ret = 0, merge_status; merge_status = merge_3way(o, &result_buf, one, a, b, branch1, branch2); if ((merge_status < 0) || !result_buf.ptr) ret = err(o, _("Failed to execute internal merge")); if (!ret && write_object_file(result_buf.ptr, result_buf.size, blob_type, &result->oid)) ret = err(o, _("Unable to add %s to database"), a->path); free(result_buf.ptr); if (ret) return ret; result->clean = (merge_status == 0); } else if (S_ISGITLINK(a->mode)) { result->clean = merge_submodule(&result->oid, one->path, &one->oid, &a->oid, &b->oid, !o->call_depth); } else if (S_ISLNK(a->mode)) { switch (o->recursive_variant) { case MERGE_RECURSIVE_NORMAL: oidcpy(&result->oid, &a->oid); if (!oid_eq(&a->oid, &b->oid)) result->clean = 0; break; case MERGE_RECURSIVE_OURS: oidcpy(&result->oid, &a->oid); break; case MERGE_RECURSIVE_THEIRS: oidcpy(&result->oid, &b->oid); break; } } else die("BUG: unsupported object type in the tree"); } return 0; } static int merge_file_special_markers(struct merge_options *o, const struct diff_filespec *one, const struct diff_filespec *a, const struct diff_filespec *b, const char *branch1, const char *filename1, const char *branch2, const char *filename2, struct merge_file_info *mfi) { char *side1 = NULL; char *side2 = NULL; int ret; if (filename1) side1 = xstrfmt("%s:%s", branch1, filename1); if (filename2) side2 = xstrfmt("%s:%s", branch2, filename2); ret = merge_file_1(o, one, a, b, side1 ? side1 : branch1, side2 ? side2 : branch2, mfi); free(side1); free(side2); return ret; } static int merge_file_one(struct merge_options *o, const char *path, const struct object_id *o_oid, int o_mode, const struct object_id *a_oid, int a_mode, const struct object_id *b_oid, int b_mode, const char *branch1, const char *branch2, struct merge_file_info *mfi) { struct diff_filespec one, a, b; one.path = a.path = b.path = (char *)path; oidcpy(&one.oid, o_oid); one.mode = o_mode; oidcpy(&a.oid, a_oid); a.mode = a_mode; oidcpy(&b.oid, b_oid); b.mode = b_mode; return merge_file_1(o, &one, &a, &b, branch1, branch2, mfi); } static int handle_change_delete(struct merge_options *o, const char *path, const char *old_path, const struct object_id *o_oid, int o_mode, const struct object_id *changed_oid, int changed_mode, const char *change_branch, const char *delete_branch, const char *change, const char *change_past) { char *alt_path = NULL; const char *update_path = path; int ret = 0; if (dir_in_way(path, !o->call_depth, 0)) { update_path = alt_path = unique_path(o, path, change_branch); } if (o->call_depth) { /* * We cannot arbitrarily accept either a_sha or b_sha as * correct; since there is no true "middle point" between * them, simply reuse the base version for virtual merge base. */ ret = remove_file_from_cache(path); if (!ret) ret = update_file(o, 0, o_oid, o_mode, update_path); } else { if (!alt_path) { if (!old_path) { output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s " "and %s in %s. Version %s of %s left in tree."), change, path, delete_branch, change_past, change_branch, change_branch, path); } else { output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s " "and %s to %s in %s. Version %s of %s left in tree."), change, old_path, delete_branch, change_past, path, change_branch, change_branch, path); } } else { if (!old_path) { output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s " "and %s in %s. Version %s of %s left in tree at %s."), change, path, delete_branch, change_past, change_branch, change_branch, path, alt_path); } else { output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s " "and %s to %s in %s. Version %s of %s left in tree at %s."), change, old_path, delete_branch, change_past, path, change_branch, change_branch, path, alt_path); } } /* * No need to call update_file() on path when change_branch == * o->branch1 && !alt_path, since that would needlessly touch * path. We could call update_file_flags() with update_cache=0 * and update_wd=0, but that's a no-op. */ if (change_branch != o->branch1 || alt_path) ret = update_file(o, 0, changed_oid, changed_mode, update_path); } free(alt_path); return ret; } static int conflict_rename_delete(struct merge_options *o, struct diff_filepair *pair, const char *rename_branch, const char *delete_branch) { const struct diff_filespec *orig = pair->one; const struct diff_filespec *dest = pair->two; if (handle_change_delete(o, o->call_depth ? orig->path : dest->path, o->call_depth ? NULL : orig->path, &orig->oid, orig->mode, &dest->oid, dest->mode, rename_branch, delete_branch, _("rename"), _("renamed"))) return -1; if (o->call_depth) return remove_file_from_cache(dest->path); else return update_stages(o, dest->path, NULL, rename_branch == o->branch1 ? dest : NULL, rename_branch == o->branch1 ? NULL : dest); } static struct diff_filespec *filespec_from_entry(struct diff_filespec *target, struct stage_data *entry, int stage) { struct object_id *oid = &entry->stages[stage].oid; unsigned mode = entry->stages[stage].mode; if (mode == 0 || is_null_oid(oid)) return NULL; oidcpy(&target->oid, oid); target->mode = mode; return target; } static int handle_file(struct merge_options *o, struct diff_filespec *rename, int stage, struct rename_conflict_info *ci) { char *dst_name = rename->path; struct stage_data *dst_entry; const char *cur_branch, *other_branch; struct diff_filespec other; struct diff_filespec *add; int ret; if (stage == 2) { dst_entry = ci->dst_entry1; cur_branch = ci->branch1; other_branch = ci->branch2; } else { dst_entry = ci->dst_entry2; cur_branch = ci->branch2; other_branch = ci->branch1; } add = filespec_from_entry(&other, dst_entry, stage ^ 1); if (add) { char *add_name = unique_path(o, rename->path, other_branch); if (update_file(o, 0, &add->oid, add->mode, add_name)) return -1; remove_file(o, 0, rename->path, 0); dst_name = unique_path(o, rename->path, cur_branch); } else { if (dir_in_way(rename->path, !o->call_depth, 0)) { dst_name = unique_path(o, rename->path, cur_branch); output(o, 1, _("%s is a directory in %s adding as %s instead"), rename->path, other_branch, dst_name); } } if ((ret = update_file(o, 0, &rename->oid, rename->mode, dst_name))) ; /* fall through, do allow dst_name to be released */ else if (stage == 2) ret = update_stages(o, rename->path, NULL, rename, add); else ret = update_stages(o, rename->path, NULL, add, rename); if (dst_name != rename->path) free(dst_name); return ret; } static int conflict_rename_rename_1to2(struct merge_options *o, struct rename_conflict_info *ci) { /* One file was renamed in both branches, but to different names. */ struct diff_filespec *one = ci->pair1->one; struct diff_filespec *a = ci->pair1->two; struct diff_filespec *b = ci->pair2->two; output(o, 1, _("CONFLICT (rename/rename): " "Rename \"%s\"->\"%s\" in branch \"%s\" " "rename \"%s\"->\"%s\" in \"%s\"%s"), one->path, a->path, ci->branch1, one->path, b->path, ci->branch2, o->call_depth ? _(" (left unresolved)") : ""); if (o->call_depth) { struct merge_file_info mfi; struct diff_filespec other; struct diff_filespec *add; if (merge_file_one(o, one->path, &one->oid, one->mode, &a->oid, a->mode, &b->oid, b->mode, ci->branch1, ci->branch2, &mfi)) return -1; /* * FIXME: For rename/add-source conflicts (if we could detect * such), this is wrong. We should instead find a unique * pathname and then either rename the add-source file to that * unique path, or use that unique path instead of src here. */ if (update_file(o, 0, &mfi.oid, mfi.mode, one->path)) return -1; /* * Above, we put the merged content at the merge-base's * path. Now we usually need to delete both a->path and * b->path. However, the rename on each side of the merge * could also be involved in a rename/add conflict. In * such cases, we should keep the added file around, * resolving the conflict at that path in its favor. */ add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1); if (add) { if (update_file(o, 0, &add->oid, add->mode, a->path)) return -1; } else remove_file_from_cache(a->path); add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1); if (add) { if (update_file(o, 0, &add->oid, add->mode, b->path)) return -1; } else remove_file_from_cache(b->path); } else if (handle_file(o, a, 2, ci) || handle_file(o, b, 3, ci)) return -1; return 0; } static int conflict_rename_rename_2to1(struct merge_options *o, struct rename_conflict_info *ci) { /* Two files, a & b, were renamed to the same thing, c. */ struct diff_filespec *a = ci->pair1->one; struct diff_filespec *b = ci->pair2->one; struct diff_filespec *c1 = ci->pair1->two; struct diff_filespec *c2 = ci->pair2->two; char *path = c1->path; /* == c2->path */ struct merge_file_info mfi_c1; struct merge_file_info mfi_c2; int ret; output(o, 1, _("CONFLICT (rename/rename): " "Rename %s->%s in %s. " "Rename %s->%s in %s"), a->path, c1->path, ci->branch1, b->path, c2->path, ci->branch2); remove_file(o, 1, a->path, o->call_depth || would_lose_untracked(a->path)); remove_file(o, 1, b->path, o->call_depth || would_lose_untracked(b->path)); if (merge_file_special_markers(o, a, c1, &ci->ren1_other, o->branch1, c1->path, o->branch2, ci->ren1_other.path, &mfi_c1) || merge_file_special_markers(o, b, &ci->ren2_other, c2, o->branch1, ci->ren2_other.path, o->branch2, c2->path, &mfi_c2)) return -1; if (o->call_depth) { /* * If mfi_c1.clean && mfi_c2.clean, then it might make * sense to do a two-way merge of those results. But, I * think in all cases, it makes sense to have the virtual * merge base just undo the renames; they can be detected * again later for the non-recursive merge. */ remove_file(o, 0, path, 0); ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path); if (!ret) ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, b->path); } else { char *new_path1 = unique_path(o, path, ci->branch1); char *new_path2 = unique_path(o, path, ci->branch2); output(o, 1, _("Renaming %s to %s and %s to %s instead"), a->path, new_path1, b->path, new_path2); remove_file(o, 0, path, 0); ret = update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1); if (!ret) ret = update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, new_path2); free(new_path2); free(new_path1); } return ret; } static int process_renames(struct merge_options *o, struct string_list *a_renames, struct string_list *b_renames) { int clean_merge = 1, i, j; struct string_list a_by_dst = STRING_LIST_INIT_NODUP; struct string_list b_by_dst = STRING_LIST_INIT_NODUP; const struct rename *sre; for (i = 0; i < a_renames->nr; i++) { sre = a_renames->items[i].util; string_list_insert(&a_by_dst, sre->pair->two->path)->util = (void *)sre; } for (i = 0; i < b_renames->nr; i++) { sre = b_renames->items[i].util; string_list_insert(&b_by_dst, sre->pair->two->path)->util = (void *)sre; } for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) { struct string_list *renames1, *renames2Dst; struct rename *ren1 = NULL, *ren2 = NULL; const char *branch1, *branch2; const char *ren1_src, *ren1_dst; struct string_list_item *lookup; if (i >= a_renames->nr) { ren2 = b_renames->items[j++].util; } else if (j >= b_renames->nr) { ren1 = a_renames->items[i++].util; } else { int compare = strcmp(a_renames->items[i].string, b_renames->items[j].string); if (compare <= 0) ren1 = a_renames->items[i++].util; if (compare >= 0) ren2 = b_renames->items[j++].util; } /* TODO: refactor, so that 1/2 are not needed */ if (ren1) { renames1 = a_renames; renames2Dst = &b_by_dst; branch1 = o->branch1; branch2 = o->branch2; } else { renames1 = b_renames; renames2Dst = &a_by_dst; branch1 = o->branch2; branch2 = o->branch1; SWAP(ren2, ren1); } if (ren1->processed) continue; ren1->processed = 1; ren1->dst_entry->processed = 1; /* BUG: We should only mark src_entry as processed if we * are not dealing with a rename + add-source case. */ ren1->src_entry->processed = 1; ren1_src = ren1->pair->one->path; ren1_dst = ren1->pair->two->path; if (ren2) { /* One file renamed on both sides */ const char *ren2_src = ren2->pair->one->path; const char *ren2_dst = ren2->pair->two->path; enum rename_type rename_type; if (strcmp(ren1_src, ren2_src) != 0) die("BUG: ren1_src != ren2_src"); ren2->dst_entry->processed = 1; ren2->processed = 1; if (strcmp(ren1_dst, ren2_dst) != 0) { rename_type = RENAME_ONE_FILE_TO_TWO; clean_merge = 0; } else { rename_type = RENAME_ONE_FILE_TO_ONE; /* BUG: We should only remove ren1_src in * the base stage (think of rename + * add-source cases). */ remove_file(o, 1, ren1_src, 1); update_entry(ren1->dst_entry, ren1->pair->one, ren1->pair->two, ren2->pair->two); } setup_rename_conflict_info(rename_type, ren1->pair, ren2->pair, branch1, branch2, ren1->dst_entry, ren2->dst_entry, o, NULL, NULL); } else if ((lookup = string_list_lookup(renames2Dst, ren1_dst))) { /* Two different files renamed to the same thing */ char *ren2_dst; ren2 = lookup->util; ren2_dst = ren2->pair->two->path; if (strcmp(ren1_dst, ren2_dst) != 0) die("BUG: ren1_dst != ren2_dst"); clean_merge = 0; ren2->processed = 1; /* * BUG: We should only mark src_entry as processed * if we are not dealing with a rename + add-source * case. */ ren2->src_entry->processed = 1; setup_rename_conflict_info(RENAME_TWO_FILES_TO_ONE, ren1->pair, ren2->pair, branch1, branch2, ren1->dst_entry, ren2->dst_entry, o, ren1->src_entry, ren2->src_entry); } else { /* Renamed in 1, maybe changed in 2 */ /* we only use sha1 and mode of these */ struct diff_filespec src_other, dst_other; int try_merge; /* * unpack_trees loads entries from common-commit * into stage 1, from head-commit into stage 2, and * from merge-commit into stage 3. We keep track * of which side corresponds to the rename. */ int renamed_stage = a_renames == renames1 ? 2 : 3; int other_stage = a_renames == renames1 ? 3 : 2; /* BUG: We should only remove ren1_src in the base * stage and in other_stage (think of rename + * add-source case). */ remove_file(o, 1, ren1_src, renamed_stage == 2 || !was_tracked(ren1_src)); oidcpy(&src_other.oid, &ren1->src_entry->stages[other_stage].oid); src_other.mode = ren1->src_entry->stages[other_stage].mode; oidcpy(&dst_other.oid, &ren1->dst_entry->stages[other_stage].oid); dst_other.mode = ren1->dst_entry->stages[other_stage].mode; try_merge = 0; if (oid_eq(&src_other.oid, &null_oid)) { setup_rename_conflict_info(RENAME_DELETE, ren1->pair, NULL, branch1, branch2, ren1->dst_entry, NULL, o, NULL, NULL); } else if ((dst_other.mode == ren1->pair->two->mode) && oid_eq(&dst_other.oid, &ren1->pair->two->oid)) { /* * Added file on the other side identical to * the file being renamed: clean merge. * Also, there is no need to overwrite the * file already in the working copy, so call * update_file_flags() instead of * update_file(). */ if (update_file_flags(o, &ren1->pair->two->oid, ren1->pair->two->mode, ren1_dst, 1, /* update_cache */ 0 /* update_wd */)) clean_merge = -1; } else if (!oid_eq(&dst_other.oid, &null_oid)) { clean_merge = 0; try_merge = 1; output(o, 1, _("CONFLICT (rename/add): Rename %s->%s in %s. " "%s added in %s"), ren1_src, ren1_dst, branch1, ren1_dst, branch2); if (o->call_depth) { struct merge_file_info mfi; if (merge_file_one(o, ren1_dst, &null_oid, 0, &ren1->pair->two->oid, ren1->pair->two->mode, &dst_other.oid, dst_other.mode, branch1, branch2, &mfi)) { clean_merge = -1; goto cleanup_and_return; } output(o, 1, _("Adding merged %s"), ren1_dst); if (update_file(o, 0, &mfi.oid, mfi.mode, ren1_dst)) clean_merge = -1; try_merge = 0; } else { char *new_path = unique_path(o, ren1_dst, branch2); output(o, 1, _("Adding as %s instead"), new_path); if (update_file(o, 0, &dst_other.oid, dst_other.mode, new_path)) clean_merge = -1; free(new_path); } } else try_merge = 1; if (clean_merge < 0) goto cleanup_and_return; if (try_merge) { struct diff_filespec *one, *a, *b; src_other.path = (char *)ren1_src; one = ren1->pair->one; if (a_renames == renames1) { a = ren1->pair->two; b = &src_other; } else { b = ren1->pair->two; a = &src_other; } update_entry(ren1->dst_entry, one, a, b); setup_rename_conflict_info(RENAME_NORMAL, ren1->pair, NULL, branch1, NULL, ren1->dst_entry, NULL, o, NULL, NULL); } } } cleanup_and_return: string_list_clear(&a_by_dst, 0); string_list_clear(&b_by_dst, 0); return clean_merge; } static struct object_id *stage_oid(const struct object_id *oid, unsigned mode) { return (is_null_oid(oid) || mode == 0) ? NULL: (struct object_id *)oid; } static int read_oid_strbuf(struct merge_options *o, const struct object_id *oid, struct strbuf *dst) { void *buf; enum object_type type; unsigned long size; buf = read_object_file(oid, &type, &size); if (!buf) return err(o, _("cannot read object %s"), oid_to_hex(oid)); if (type != OBJ_BLOB) { free(buf); return err(o, _("object %s is not a blob"), oid_to_hex(oid)); } strbuf_attach(dst, buf, size, size + 1); return 0; } static int blob_unchanged(struct merge_options *opt, const struct object_id *o_oid, unsigned o_mode, const struct object_id *a_oid, unsigned a_mode, int renormalize, const char *path) { struct strbuf o = STRBUF_INIT; struct strbuf a = STRBUF_INIT; int ret = 0; /* assume changed for safety */ if (a_mode != o_mode) return 0; if (oid_eq(o_oid, a_oid)) return 1; if (!renormalize) return 0; assert(o_oid && a_oid); if (read_oid_strbuf(opt, o_oid, &o) || read_oid_strbuf(opt, a_oid, &a)) goto error_return; /* * Note: binary | is used so that both renormalizations are * performed. Comparison can be skipped if both files are * unchanged since their sha1s have already been compared. */ if (renormalize_buffer(&the_index, path, o.buf, o.len, &o) | renormalize_buffer(&the_index, path, a.buf, a.len, &a)) ret = (o.len == a.len && !memcmp(o.buf, a.buf, o.len)); error_return: strbuf_release(&o); strbuf_release(&a); return ret; } static int handle_modify_delete(struct merge_options *o, const char *path, struct object_id *o_oid, int o_mode, struct object_id *a_oid, int a_mode, struct object_id *b_oid, int b_mode) { const char *modify_branch, *delete_branch; struct object_id *changed_oid; int changed_mode; if (a_oid) { modify_branch = o->branch1; delete_branch = o->branch2; changed_oid = a_oid; changed_mode = a_mode; } else { modify_branch = o->branch2; delete_branch = o->branch1; changed_oid = b_oid; changed_mode = b_mode; } return handle_change_delete(o, path, NULL, o_oid, o_mode, changed_oid, changed_mode, modify_branch, delete_branch, _("modify"), _("modified")); } static int merge_content(struct merge_options *o, const char *path, struct object_id *o_oid, int o_mode, struct object_id *a_oid, int a_mode, struct object_id *b_oid, int b_mode, struct rename_conflict_info *rename_conflict_info) { const char *reason = _("content"); const char *path1 = NULL, *path2 = NULL; struct merge_file_info mfi; struct diff_filespec one, a, b; unsigned df_conflict_remains = 0; if (!o_oid) { reason = _("add/add"); o_oid = (struct object_id *)&null_oid; } one.path = a.path = b.path = (char *)path; oidcpy(&one.oid, o_oid); one.mode = o_mode; oidcpy(&a.oid, a_oid); a.mode = a_mode; oidcpy(&b.oid, b_oid); b.mode = b_mode; if (rename_conflict_info) { struct diff_filepair *pair1 = rename_conflict_info->pair1; path1 = (o->branch1 == rename_conflict_info->branch1) ? pair1->two->path : pair1->one->path; /* If rename_conflict_info->pair2 != NULL, we are in * RENAME_ONE_FILE_TO_ONE case. Otherwise, we have a * normal rename. */ path2 = (rename_conflict_info->pair2 || o->branch2 == rename_conflict_info->branch1) ? pair1->two->path : pair1->one->path; if (dir_in_way(path, !o->call_depth, S_ISGITLINK(pair1->two->mode))) df_conflict_remains = 1; } if (merge_file_special_markers(o, &one, &a, &b, o->branch1, path1, o->branch2, path2, &mfi)) return -1; if (mfi.clean && !df_conflict_remains && oid_eq(&mfi.oid, a_oid) && mfi.mode == a_mode) { int path_renamed_outside_HEAD; output(o, 3, _("Skipped %s (merged same as existing)"), path); /* * The content merge resulted in the same file contents we * already had. We can return early if those file contents * are recorded at the correct path (which may not be true * if the merge involves a rename). */ path_renamed_outside_HEAD = !path2 || !strcmp(path, path2); if (!path_renamed_outside_HEAD) { add_cacheinfo(o, mfi.mode, &mfi.oid, path, 0, (!o->call_depth), 0); return mfi.clean; } } else output(o, 2, _("Auto-merging %s"), path); if (!mfi.clean) { if (S_ISGITLINK(mfi.mode)) reason = _("submodule"); output(o, 1, _("CONFLICT (%s): Merge conflict in %s"), reason, path); if (rename_conflict_info && !df_conflict_remains) if (update_stages(o, path, &one, &a, &b)) return -1; } if (df_conflict_remains) { char *new_path; if (o->call_depth) { remove_file_from_cache(path); } else { if (!mfi.clean) { if (update_stages(o, path, &one, &a, &b)) return -1; } else { int file_from_stage2 = was_tracked(path); struct diff_filespec merged; oidcpy(&merged.oid, &mfi.oid); merged.mode = mfi.mode; if (update_stages(o, path, NULL, file_from_stage2 ? &merged : NULL, file_from_stage2 ? NULL : &merged)) return -1; } } new_path = unique_path(o, path, rename_conflict_info->branch1); output(o, 1, _("Adding as %s instead"), new_path); if (update_file(o, 0, &mfi.oid, mfi.mode, new_path)) { free(new_path); return -1; } free(new_path); mfi.clean = 0; } else if (update_file(o, mfi.clean, &mfi.oid, mfi.mode, path)) return -1; return mfi.clean; } /* Per entry merge function */ static int process_entry(struct merge_options *o, const char *path, struct stage_data *entry) { int clean_merge = 1; int normalize = o->renormalize; unsigned o_mode = entry->stages[1].mode; unsigned a_mode = entry->stages[2].mode; unsigned b_mode = entry->stages[3].mode; struct object_id *o_oid = stage_oid(&entry->stages[1].oid, o_mode); struct object_id *a_oid = stage_oid(&entry->stages[2].oid, a_mode); struct object_id *b_oid = stage_oid(&entry->stages[3].oid, b_mode); entry->processed = 1; if (entry->rename_conflict_info) { struct rename_conflict_info *conflict_info = entry->rename_conflict_info; switch (conflict_info->rename_type) { case RENAME_NORMAL: case RENAME_ONE_FILE_TO_ONE: clean_merge = merge_content(o, path, o_oid, o_mode, a_oid, a_mode, b_oid, b_mode, conflict_info); break; case RENAME_DELETE: clean_merge = 0; if (conflict_rename_delete(o, conflict_info->pair1, conflict_info->branch1, conflict_info->branch2)) clean_merge = -1; break; case RENAME_ONE_FILE_TO_TWO: clean_merge = 0; if (conflict_rename_rename_1to2(o, conflict_info)) clean_merge = -1; break; case RENAME_TWO_FILES_TO_ONE: clean_merge = 0; if (conflict_rename_rename_2to1(o, conflict_info)) clean_merge = -1; break; default: entry->processed = 0; break; } } else if (o_oid && (!a_oid || !b_oid)) { /* Case A: Deleted in one */ if ((!a_oid && !b_oid) || (!b_oid && blob_unchanged(o, o_oid, o_mode, a_oid, a_mode, normalize, path)) || (!a_oid && blob_unchanged(o, o_oid, o_mode, b_oid, b_mode, normalize, path))) { /* Deleted in both or deleted in one and * unchanged in the other */ if (a_oid) output(o, 2, _("Removing %s"), path); /* do not touch working file if it did not exist */ remove_file(o, 1, path, !a_oid); } else { /* Modify/delete; deleted side may have put a directory in the way */ clean_merge = 0; if (handle_modify_delete(o, path, o_oid, o_mode, a_oid, a_mode, b_oid, b_mode)) clean_merge = -1; } } else if ((!o_oid && a_oid && !b_oid) || (!o_oid && !a_oid && b_oid)) { /* Case B: Added in one. */ /* [nothing|directory] -> ([nothing|directory], file) */ const char *add_branch; const char *other_branch; unsigned mode; const struct object_id *oid; const char *conf; if (a_oid) { add_branch = o->branch1; other_branch = o->branch2; mode = a_mode; oid = a_oid; conf = _("file/directory"); } else { add_branch = o->branch2; other_branch = o->branch1; mode = b_mode; oid = b_oid; conf = _("directory/file"); } if (dir_in_way(path, !o->call_depth && !S_ISGITLINK(a_mode), 0)) { char *new_path = unique_path(o, path, add_branch); clean_merge = 0; output(o, 1, _("CONFLICT (%s): There is a directory with name %s in %s. " "Adding %s as %s"), conf, path, other_branch, path, new_path); if (update_file(o, 0, oid, mode, new_path)) clean_merge = -1; else if (o->call_depth) remove_file_from_cache(path); free(new_path); } else { output(o, 2, _("Adding %s"), path); /* do not overwrite file if already present */ if (update_file_flags(o, oid, mode, path, 1, !a_oid)) clean_merge = -1; } } else if (a_oid && b_oid) { /* Case C: Added in both (check for same permissions) and */ /* case D: Modified in both, but differently. */ clean_merge = merge_content(o, path, o_oid, o_mode, a_oid, a_mode, b_oid, b_mode, NULL); } else if (!o_oid && !a_oid && !b_oid) { /* * this entry was deleted altogether. a_mode == 0 means * we had that path and want to actively remove it. */ remove_file(o, 1, path, !a_mode); } else die("BUG: fatal merge failure, shouldn't happen."); return clean_merge; } int merge_trees(struct merge_options *o, struct tree *head, struct tree *merge, struct tree *common, struct tree **result) { int code, clean; if (o->subtree_shift) { merge = shift_tree_object(head, merge, o->subtree_shift); common = shift_tree_object(head, common, o->subtree_shift); } if (oid_eq(&common->object.oid, &merge->object.oid)) { struct strbuf sb = STRBUF_INIT; if (!o->call_depth && index_has_changes(&sb)) { err(o, _("Dirty index: cannot merge (dirty: %s)"), sb.buf); return 0; } output(o, 0, _("Already up to date!")); *result = head; return 1; } code = git_merge_trees(o->call_depth, common, head, merge); if (code != 0) { if (show(o, 4) || o->call_depth) err(o, _("merging of trees %s and %s failed"), oid_to_hex(&head->object.oid), oid_to_hex(&merge->object.oid)); return -1; } if (unmerged_cache()) { struct string_list *entries, *re_head, *re_merge; int i; /* * Only need the hashmap while processing entries, so * initialize it here and free it when we are done running * through the entries. Keeping it in the merge_options as * opposed to decaring a local hashmap is for convenience * so that we don't have to pass it to around. */ hashmap_init(&o->current_file_dir_set, path_hashmap_cmp, NULL, 512); get_files_dirs(o, head); get_files_dirs(o, merge); entries = get_unmerged(); re_head = get_renames(o, head, common, head, merge, entries); re_merge = get_renames(o, merge, common, head, merge, entries); clean = process_renames(o, re_head, re_merge); record_df_conflict_files(o, entries); if (clean < 0) goto cleanup; for (i = entries->nr-1; 0 <= i; i--) { const char *path = entries->items[i].string; struct stage_data *e = entries->items[i].util; if (!e->processed) { int ret = process_entry(o, path, e); if (!ret) clean = 0; else if (ret < 0) { clean = ret; goto cleanup; } } } for (i = 0; i < entries->nr; i++) { struct stage_data *e = entries->items[i].util; if (!e->processed) die("BUG: unprocessed path??? %s", entries->items[i].string); } cleanup: string_list_clear(re_merge, 0); string_list_clear(re_head, 0); string_list_clear(entries, 1); hashmap_free(&o->current_file_dir_set, 1); free(re_merge); free(re_head); free(entries); if (clean < 0) return clean; } else clean = 1; if (o->call_depth && !(*result = write_tree_from_memory(o))) return -1; return clean; } static struct commit_list *reverse_commit_list(struct commit_list *list) { struct commit_list *next = NULL, *current, *backup; for (current = list; current; current = backup) { backup = current->next; current->next = next; next = current; } return next; } /* * Merge the commits h1 and h2, return the resulting virtual * commit object and a flag indicating the cleanness of the merge. */ int merge_recursive(struct merge_options *o, struct commit *h1, struct commit *h2, struct commit_list *ca, struct commit **result) { struct commit_list *iter; struct commit *merged_common_ancestors; struct tree *mrtree; int clean; if (show(o, 4)) { output(o, 4, _("Merging:")); output_commit_title(o, h1); output_commit_title(o, h2); } if (!ca) { ca = get_merge_bases(h1, h2); ca = reverse_commit_list(ca); } if (show(o, 5)) { unsigned cnt = commit_list_count(ca); output(o, 5, Q_("found %u common ancestor:", "found %u common ancestors:", cnt), cnt); for (iter = ca; iter; iter = iter->next) output_commit_title(o, iter->item); } merged_common_ancestors = pop_commit(&ca); if (merged_common_ancestors == NULL) { /* if there is no common ancestor, use an empty tree */ struct tree *tree; tree = lookup_tree(the_hash_algo->empty_tree); merged_common_ancestors = make_virtual_commit(tree, "ancestor"); } for (iter = ca; iter; iter = iter->next) { const char *saved_b1, *saved_b2; o->call_depth++; /* * When the merge fails, the result contains files * with conflict markers. The cleanness flag is * ignored (unless indicating an error), it was never * actually used, as result of merge_trees has always * overwritten it: the committed "conflicts" were * already resolved. */ discard_cache(); saved_b1 = o->branch1; saved_b2 = o->branch2; o->branch1 = "Temporary merge branch 1"; o->branch2 = "Temporary merge branch 2"; if (merge_recursive(o, merged_common_ancestors, iter->item, NULL, &merged_common_ancestors) < 0) return -1; o->branch1 = saved_b1; o->branch2 = saved_b2; o->call_depth--; if (!merged_common_ancestors) return err(o, _("merge returned no commit")); } discard_cache(); if (!o->call_depth) read_cache(); o->ancestor = "merged common ancestors"; clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree, &mrtree); if (clean < 0) { flush_output(o); return clean; } if (o->call_depth) { *result = make_virtual_commit(mrtree, "merged tree"); commit_list_insert(h1, &(*result)->parents); commit_list_insert(h2, &(*result)->parents->next); } flush_output(o); if (!o->call_depth && o->buffer_output < 2) strbuf_release(&o->obuf); if (show(o, 2)) diff_warn_rename_limit("merge.renamelimit", o->needed_rename_limit, 0); return clean; } static struct commit *get_ref(const struct object_id *oid, const char *name) { struct object *object; object = deref_tag(parse_object(oid), name, strlen(name)); if (!object) return NULL; if (object->type == OBJ_TREE) return make_virtual_commit((struct tree*)object, name); if (object->type != OBJ_COMMIT) return NULL; if (parse_commit((struct commit *)object)) return NULL; return (struct commit *)object; } int merge_recursive_generic(struct merge_options *o, const struct object_id *head, const struct object_id *merge, int num_base_list, const struct object_id **base_list, struct commit **result) { int clean; struct lock_file lock = LOCK_INIT; struct commit *head_commit = get_ref(head, o->branch1); struct commit *next_commit = get_ref(merge, o->branch2); struct commit_list *ca = NULL; if (base_list) { int i; for (i = 0; i < num_base_list; ++i) { struct commit *base; if (!(base = get_ref(base_list[i], oid_to_hex(base_list[i])))) return err(o, _("Could not parse object '%s'"), oid_to_hex(base_list[i])); commit_list_insert(base, &ca); } } hold_locked_index(&lock, LOCK_DIE_ON_ERROR); clean = merge_recursive(o, head_commit, next_commit, ca, result); if (clean < 0) { rollback_lock_file(&lock); return clean; } if (write_locked_index(&the_index, &lock, COMMIT_LOCK | SKIP_IF_UNCHANGED)) return err(o, _("Unable to write index.")); return clean ? 0 : 1; } static void merge_recursive_config(struct merge_options *o) { git_config_get_int("merge.verbosity", &o->verbosity); git_config_get_int("diff.renamelimit", &o->diff_rename_limit); git_config_get_int("merge.renamelimit", &o->merge_rename_limit); git_config(git_xmerge_config, NULL); } void init_merge_options(struct merge_options *o) { const char *merge_verbosity; memset(o, 0, sizeof(struct merge_options)); o->verbosity = 2; o->buffer_output = 1; o->diff_rename_limit = -1; o->merge_rename_limit = -1; o->renormalize = 0; o->detect_rename = 1; merge_recursive_config(o); merge_verbosity = getenv("GIT_MERGE_VERBOSITY"); if (merge_verbosity) o->verbosity = strtol(merge_verbosity, NULL, 10); if (o->verbosity >= 5) o->buffer_output = 0; strbuf_init(&o->obuf, 0); string_list_init(&o->df_conflict_file_set, 1); } int parse_merge_opt(struct merge_options *o, const char *s) { const char *arg; if (!s || !*s) return -1; if (!strcmp(s, "ours")) o->recursive_variant = MERGE_RECURSIVE_OURS; else if (!strcmp(s, "theirs")) o->recursive_variant = MERGE_RECURSIVE_THEIRS; else if (!strcmp(s, "subtree")) o->subtree_shift = ""; else if (skip_prefix(s, "subtree=", &arg)) o->subtree_shift = arg; else if (!strcmp(s, "patience")) o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF); else if (!strcmp(s, "histogram")) o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF); else if (skip_prefix(s, "diff-algorithm=", &arg)) { long value = parse_algorithm_value(arg); if (value < 0) return -1; /* clear out previous settings */ DIFF_XDL_CLR(o, NEED_MINIMAL); o->xdl_opts &= ~XDF_DIFF_ALGORITHM_MASK; o->xdl_opts |= value; } else if (!strcmp(s, "ignore-space-change")) DIFF_XDL_SET(o, IGNORE_WHITESPACE_CHANGE); else if (!strcmp(s, "ignore-all-space")) DIFF_XDL_SET(o, IGNORE_WHITESPACE); else if (!strcmp(s, "ignore-space-at-eol")) DIFF_XDL_SET(o, IGNORE_WHITESPACE_AT_EOL); else if (!strcmp(s, "ignore-cr-at-eol")) DIFF_XDL_SET(o, IGNORE_CR_AT_EOL); else if (!strcmp(s, "renormalize")) o->renormalize = 1; else if (!strcmp(s, "no-renormalize")) o->renormalize = 0; else if (!strcmp(s, "no-renames")) o->detect_rename = 0; else if (!strcmp(s, "find-renames")) { o->detect_rename = 1; o->rename_score = 0; } else if (skip_prefix(s, "find-renames=", &arg) || skip_prefix(s, "rename-threshold=", &arg)) { if ((o->rename_score = parse_rename_score(&arg)) == -1 || *arg != 0) return -1; o->detect_rename = 1; } else return -1; return 0; }