/* * 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 "advice.h" #include "cache.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" static struct tree *shift_tree_object(struct tree *one, struct tree *two, const char *subtree_shift) { unsigned char shifted[20]; if (!*subtree_shift) { shift_tree(one->object.sha1, two->object.sha1, shifted, 0); } else { shift_tree_by(one->object.sha1, two->object.sha1, shifted, subtree_shift); } if (!hashcmp(two->object.sha1, shifted)) return two; return lookup_tree(shifted); } /* * A virtual commit has (const char *)commit->util set to the name. */ static struct commit *make_virtual_commit(struct tree *tree, const char *comment) { struct commit *commit = xcalloc(1, sizeof(struct commit)); commit->tree = tree; commit->util = (void*)comment; /* avoid warnings */ 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 sha_eq(const unsigned char *a, const unsigned char *b) { if (!a && !b) return 2; return a && b && hashcmp(a, b) == 0; } /* * Since we want to write the index eventually, we cannot reuse the index * for these (temporary) data. */ struct stage_data { struct { unsigned mode; unsigned char sha[20]; } stages[4]; unsigned processed:1; }; static int show(struct merge_options *o, int v) { return (!o->call_depth && o->verbosity >= v) || o->verbosity >= 5; } static void flush_output(struct merge_options *o) { if (o->obuf.len) { fputs(o->obuf.buf, stdout); strbuf_reset(&o->obuf); } } __attribute__((format (printf, 3, 4))) static void output(struct merge_options *o, int v, const char *fmt, ...) { int len; va_list ap; if (!show(o, v)) return; strbuf_grow(&o->obuf, o->call_depth * 2 + 2); memset(o->obuf.buf + o->obuf.len, ' ', o->call_depth * 2); strbuf_setlen(&o->obuf, o->obuf.len + o->call_depth * 2); va_start(ap, fmt); len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap); va_end(ap); if (len < 0) len = 0; if (len >= strbuf_avail(&o->obuf)) { strbuf_grow(&o->obuf, len + 2); va_start(ap, fmt); len = vsnprintf(o->obuf.buf + o->obuf.len, strbuf_avail(&o->obuf), fmt, ap); va_end(ap); if (len >= strbuf_avail(&o->obuf)) { die("this should not happen, your snprintf is broken"); } } strbuf_setlen(&o->obuf, o->obuf.len + len); strbuf_add(&o->obuf, "\n", 1); if (!o->buffer_output) flush_output(o); } static void output_commit_title(struct merge_options *o, struct commit *commit) { int i; flush_output(o); for (i = o->call_depth; i--;) fputs(" ", stdout); if (commit->util) printf("virtual %s\n", (char *)commit->util); else { printf("%s ", find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV)); if (parse_commit(commit) != 0) printf("(bad commit)\n"); else { const char *s; int len; for (s = commit->buffer; *s; s++) if (*s == '\n' && s[1] == '\n') { s += 2; break; } for (len = 0; s[len] && '\n' != s[len]; len++) ; /* do nothing */ printf("%.*s\n", len, s); } } } static int add_cacheinfo(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh, int options) { struct cache_entry *ce; ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage, refresh); if (!ce) return error("addinfo_cache failed for path '%s'", path); return add_cache_entry(ce, options); } 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; opts.msgs = get_porcelain_error_msgs(); 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++) { struct cache_entry *ce = active_cache[i]; if (ce_stage(ce)) fprintf(stderr, "BUG: %d %.*s", ce_stage(ce), (int)ce_namelen(ce), ce->name); } die("Bug in merge-recursive.c"); } if (!active_cache_tree) active_cache_tree = cache_tree(); if (!cache_tree_fully_valid(active_cache_tree) && cache_tree_update(active_cache_tree, active_cache, active_nr, 0, 0) < 0) die("error building trees"); result = lookup_tree(active_cache_tree->sha1); return result; } static int save_files_dirs(const unsigned char *sha1, const char *base, int baselen, const char *path, unsigned int mode, int stage, void *context) { int len = strlen(path); char *newpath = xmalloc(baselen + len + 1); struct merge_options *o = context; memcpy(newpath, base, baselen); memcpy(newpath + baselen, path, len); newpath[baselen + len] = '\0'; if (S_ISDIR(mode)) string_list_insert(newpath, &o->current_directory_set); else string_list_insert(newpath, &o->current_file_set); free(newpath); return (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0); } static int get_files_dirs(struct merge_options *o, struct tree *tree) { int n; if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs, o)) return 0; n = o->current_file_set.nr + o->current_directory_set.nr; return n; } /* * 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.sha1, path, e->stages[1].sha, &e->stages[1].mode); get_tree_entry(a->object.sha1, path, e->stages[2].sha, &e->stages[2].mode); get_tree_entry(b->object.sha1, path, e->stages[3].sha, &e->stages[3].mode); item = string_list_insert(path, entries); 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; struct cache_entry *ce = active_cache[i]; if (!ce_stage(ce)) continue; item = string_list_lookup(ce->name, unmerged); if (!item) { item = string_list_insert(ce->name, unmerged); item->util = xcalloc(1, sizeof(struct stage_data)); } e = item->util; e->stages[ce_stage(ce)].mode = ce->ce_mode; hashcpy(e->stages[ce_stage(ce)].sha, ce->sha1); } return unmerged; } struct rename { struct diff_filepair *pair; 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)); diff_setup(&opts); DIFF_OPT_SET(&opts, RECURSIVE); 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 : 500; opts.warn_on_too_large_rename = 1; opts.output_format = DIFF_FORMAT_NO_OUTPUT; if (diff_setup_done(&opts) < 0) die("diff setup failed"); diff_tree_sha1(o_tree->object.sha1, tree->object.sha1, "", &opts); diffcore_std(&opts); 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(re->pair->one->path, entries); 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(re->pair->two->path, entries); 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(pair->one->path, renames); item->util = re; } opts.output_format = DIFF_FORMAT_NO_OUTPUT; diff_queued_diff.nr = 0; diff_flush(&opts); return renames; } static int update_stages(const char *path, struct diff_filespec *o, struct diff_filespec *a, struct diff_filespec *b, int clear) { int options = ADD_CACHE_OK_TO_ADD | ADD_CACHE_OK_TO_REPLACE; if (clear) if (remove_file_from_cache(path)) return -1; if (o) if (add_cacheinfo(o->mode, o->sha1, path, 1, 0, options)) return -1; if (a) if (add_cacheinfo(a->mode, a->sha1, path, 2, 0, options)) return -1; if (b) if (add_cacheinfo(b->mode, b->sha1, path, 3, 0, options)) return -1; return 0; } 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 (remove_path(path)) return -1; } return 0; } static char *unique_path(struct merge_options *o, const char *path, const char *branch) { char *newpath = xmalloc(strlen(path) + 1 + strlen(branch) + 8 + 1); int suffix = 0; struct stat st; char *p = newpath + strlen(path); strcpy(newpath, path); *(p++) = '~'; strcpy(p, branch); for (; *p; ++p) if ('/' == *p) *p = '_'; while (string_list_has_string(&o->current_file_set, newpath) || string_list_has_string(&o->current_directory_set, newpath) || lstat(newpath, &st) == 0) sprintf(p, "_%d", suffix++); string_list_insert(newpath, &o->current_file_set); return newpath; } static void flush_buffer(int fd, const char *buf, unsigned long size) { while (size > 0) { long ret = write_in_full(fd, buf, size); if (ret < 0) { /* Ignore epipe */ if (errno == EPIPE) break; die_errno("merge-recursive"); } else if (!ret) { die("merge-recursive: disk full?"); } size -= ret; buf += ret; } } static int would_lose_untracked(const char *path) { int pos = cache_name_pos(path, strlen(path)); if (pos < 0) pos = -1 - pos; while (pos < active_nr && !strcmp(path, active_cache[pos]->name)) { /* * If stage #0, it is definitely tracked. * If it has stage #2 then it was tracked * before this merge started. All other * cases the path was not tracked. */ switch (ce_stage(active_cache[pos])) { case 0: case 2: return 0; } pos++; } return file_exists(path); } static int make_room_for_path(const char *path) { int status; const char *msg = "failed to create path '%s'%s"; status = safe_create_leading_directories_const(path); if (status) { if (status == -3) { /* something else exists */ error(msg, path, ": perhaps a D/F conflict?"); return -1; } die(msg, path, ""); } /* * Do not unlink a file in the work tree if we are not * tracking it. */ if (would_lose_untracked(path)) return error("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 error(msg, path, ": perhaps a D/F conflict?"); } static void update_file_flags(struct merge_options *o, const unsigned char *sha, unsigned mode, const char *path, int update_cache, int update_wd) { 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. */ goto update_index; buf = read_sha1_file(sha, &type, &size); if (!buf) die("cannot read object %s '%s'", sha1_to_hex(sha), path); if (type != OBJ_BLOB) die("blob expected for %s '%s'", sha1_to_hex(sha), path); 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(path) < 0) { update_wd = 0; free(buf); goto update_index; } 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) die_errno("failed to open '%s'", path); flush_buffer(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)) die_errno("failed to symlink '%s'", path); free(lnk); } else die("do not know what to do with %06o %s '%s'", mode, sha1_to_hex(sha), path); free(buf); } update_index: if (update_cache) add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD); } static void update_file(struct merge_options *o, int clean, const unsigned char *sha, unsigned mode, const char *path) { update_file_flags(o, sha, mode, path, o->call_depth || clean, !o->call_depth); } /* Low level file merging, update and removal */ struct merge_file_info { unsigned char sha[20]; unsigned mode; unsigned clean:1, merge:1; }; static int merge_3way(struct merge_options *o, mmbuffer_t *result_buf, struct diff_filespec *one, struct diff_filespec *a, struct diff_filespec *b, const char *branch1, const char *branch2) { mmfile_t orig, src1, src2; char *base_name, *name1, *name2; int merge_status; int favor; if (o->call_depth) favor = 0; else { switch (o->recursive_variant) { case MERGE_RECURSIVE_OURS: favor = XDL_MERGE_FAVOR_OURS; break; case MERGE_RECURSIVE_THEIRS: favor = XDL_MERGE_FAVOR_THEIRS; break; default: favor = 0; break; } } if (strcmp(a->path, b->path) || (o->ancestor != NULL && strcmp(a->path, one->path) != 0)) { base_name = o->ancestor == NULL ? NULL : xstrdup(mkpath("%s:%s", o->ancestor, one->path)); name1 = xstrdup(mkpath("%s:%s", branch1, a->path)); name2 = xstrdup(mkpath("%s:%s", branch2, b->path)); } else { base_name = o->ancestor == NULL ? NULL : xstrdup(mkpath("%s", o->ancestor)); name1 = xstrdup(mkpath("%s", branch1)); name2 = xstrdup(mkpath("%s", branch2)); } read_mmblob(&orig, one->sha1); read_mmblob(&src1, a->sha1); read_mmblob(&src2, b->sha1); merge_status = ll_merge(result_buf, a->path, &orig, base_name, &src1, name1, &src2, name2, (!!o->call_depth) | (favor << 1)); free(name1); free(name2); free(orig.ptr); free(src1.ptr); free(src2.ptr); return merge_status; } static struct merge_file_info merge_file(struct merge_options *o, struct diff_filespec *one, struct diff_filespec *a, 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; hashcpy(result.sha, a->sha1); } else { result.mode = b->mode; hashcpy(result.sha, b->sha1); } } else { if (!sha_eq(a->sha1, one->sha1) && !sha_eq(b->sha1, one->sha1)) 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 (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, one->sha1)) hashcpy(result.sha, b->sha1); else if (sha_eq(b->sha1, one->sha1)) hashcpy(result.sha, a->sha1); else if (S_ISREG(a->mode)) { mmbuffer_t result_buf; int merge_status; merge_status = merge_3way(o, &result_buf, one, a, b, branch1, branch2); if ((merge_status < 0) || !result_buf.ptr) die("Failed to execute internal merge"); if (write_sha1_file(result_buf.ptr, result_buf.size, blob_type, result.sha)) die("Unable to add %s to database", a->path); free(result_buf.ptr); result.clean = (merge_status == 0); } else if (S_ISGITLINK(a->mode)) { result.clean = 0; hashcpy(result.sha, a->sha1); } else if (S_ISLNK(a->mode)) { hashcpy(result.sha, a->sha1); if (!sha_eq(a->sha1, b->sha1)) result.clean = 0; } else { die("unsupported object type in the tree"); } } return result; } static void conflict_rename_rename(struct merge_options *o, struct rename *ren1, const char *branch1, struct rename *ren2, const char *branch2) { char *del[2]; int delp = 0; const char *ren1_dst = ren1->pair->two->path; const char *ren2_dst = ren2->pair->two->path; const char *dst_name1 = ren1_dst; const char *dst_name2 = ren2_dst; if (string_list_has_string(&o->current_directory_set, ren1_dst)) { dst_name1 = del[delp++] = unique_path(o, ren1_dst, branch1); output(o, 1, "%s is a directory in %s adding as %s instead", ren1_dst, branch2, dst_name1); remove_file(o, 0, ren1_dst, 0); } if (string_list_has_string(&o->current_directory_set, ren2_dst)) { dst_name2 = del[delp++] = unique_path(o, ren2_dst, branch2); output(o, 1, "%s is a directory in %s adding as %s instead", ren2_dst, branch1, dst_name2); remove_file(o, 0, ren2_dst, 0); } if (o->call_depth) { remove_file_from_cache(dst_name1); remove_file_from_cache(dst_name2); /* * Uncomment to leave the conflicting names in the resulting tree * * update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, dst_name1); * update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, dst_name2); */ } else { update_stages(dst_name1, NULL, ren1->pair->two, NULL, 1); update_stages(dst_name2, NULL, NULL, ren2->pair->two, 1); } while (delp--) free(del[delp]); } static void conflict_rename_dir(struct merge_options *o, struct rename *ren1, const char *branch1) { char *new_path = unique_path(o, ren1->pair->two->path, branch1); output(o, 1, "Renaming %s to %s instead", ren1->pair->one->path, new_path); remove_file(o, 0, ren1->pair->two->path, 0); update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path); free(new_path); } static void conflict_rename_rename_2(struct merge_options *o, struct rename *ren1, const char *branch1, struct rename *ren2, const char *branch2) { char *new_path1 = unique_path(o, ren1->pair->two->path, branch1); char *new_path2 = unique_path(o, ren2->pair->two->path, branch2); output(o, 1, "Renaming %s to %s and %s to %s instead", ren1->pair->one->path, new_path1, ren2->pair->one->path, new_path2); remove_file(o, 0, ren1->pair->two->path, 0); update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1); update_file(o, 0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2); free(new_path2); free(new_path1); } 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 = {NULL, 0, 0, 0}, b_by_dst = {NULL, 0, 0, 0}; const struct rename *sre; for (i = 0; i < a_renames->nr; i++) { sre = a_renames->items[i].util; string_list_insert(sre->pair->two->path, &a_by_dst)->util = sre->dst_entry; } for (i = 0; i < b_renames->nr; i++) { sre = b_renames->items[i].util; string_list_insert(sre->pair->two->path, &b_by_dst)->util = sre->dst_entry; } for (i = 0, j = 0; i < a_renames->nr || j < b_renames->nr;) { char *src; struct string_list *renames1, *renames2Dst; struct rename *ren1 = NULL, *ren2 = NULL; const char *branch1, *branch2; const char *ren1_src, *ren1_dst; 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 { struct rename *tmp; renames1 = b_renames; renames2Dst = &a_by_dst; branch1 = o->branch2; branch2 = o->branch1; tmp = ren2; ren2 = ren1; ren1 = tmp; } src = ren1->pair->one->path; ren1->dst_entry->processed = 1; ren1->src_entry->processed = 1; if (ren1->processed) continue; ren1->processed = 1; ren1_src = ren1->pair->one->path; ren1_dst = ren1->pair->two->path; if (ren2) { const char *ren2_src = ren2->pair->one->path; const char *ren2_dst = ren2->pair->two->path; /* Renamed in 1 and renamed in 2 */ if (strcmp(ren1_src, ren2_src) != 0) die("ren1.src != ren2.src"); ren2->dst_entry->processed = 1; ren2->processed = 1; if (strcmp(ren1_dst, ren2_dst) != 0) { clean_merge = 0; output(o, 1, "CONFLICT (rename/rename): " "Rename \"%s\"->\"%s\" in branch \"%s\" " "rename \"%s\"->\"%s\" in \"%s\"%s", src, ren1_dst, branch1, src, ren2_dst, branch2, o->call_depth ? " (left unresolved)": ""); if (o->call_depth) { remove_file_from_cache(src); update_file(o, 0, ren1->pair->one->sha1, ren1->pair->one->mode, src); } conflict_rename_rename(o, ren1, branch1, ren2, branch2); } else { struct merge_file_info mfi; remove_file(o, 1, ren1_src, 1); mfi = merge_file(o, ren1->pair->one, ren1->pair->two, ren2->pair->two, branch1, branch2); if (mfi.merge || !mfi.clean) output(o, 1, "Renaming %s->%s", src, ren1_dst); if (mfi.merge) output(o, 2, "Auto-merging %s", ren1_dst); if (!mfi.clean) { output(o, 1, "CONFLICT (content): merge conflict in %s", ren1_dst); clean_merge = 0; if (!o->call_depth) update_stages(ren1_dst, ren1->pair->one, ren1->pair->two, ren2->pair->two, 1 /* clear */); } update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst); } } else { /* Renamed in 1, maybe changed in 2 */ struct string_list_item *item; /* we only use sha1 and mode of these */ struct diff_filespec src_other, dst_other; int try_merge, stage = a_renames == renames1 ? 3: 2; remove_file(o, 1, ren1_src, o->call_depth || stage == 3); hashcpy(src_other.sha1, ren1->src_entry->stages[stage].sha); src_other.mode = ren1->src_entry->stages[stage].mode; hashcpy(dst_other.sha1, ren1->dst_entry->stages[stage].sha); dst_other.mode = ren1->dst_entry->stages[stage].mode; try_merge = 0; if (string_list_has_string(&o->current_directory_set, ren1_dst)) { clean_merge = 0; output(o, 1, "CONFLICT (rename/directory): Rename %s->%s in %s " " directory %s added in %s", ren1_src, ren1_dst, branch1, ren1_dst, branch2); conflict_rename_dir(o, ren1, branch1); } else if (sha_eq(src_other.sha1, null_sha1)) { clean_merge = 0; output(o, 1, "CONFLICT (rename/delete): Rename %s->%s in %s " "and deleted in %s", ren1_src, ren1_dst, branch1, branch2); update_file(o, 0, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst); if (!o->call_depth) update_stages(ren1_dst, NULL, branch1 == o->branch1 ? ren1->pair->two : NULL, branch1 == o->branch1 ? NULL : ren1->pair->two, 1); } else if (!sha_eq(dst_other.sha1, null_sha1)) { const char *new_path; 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; struct diff_filespec one, a, b; one.path = a.path = b.path = (char *)ren1_dst; hashcpy(one.sha1, null_sha1); one.mode = 0; hashcpy(a.sha1, ren1->pair->two->sha1); a.mode = ren1->pair->two->mode; hashcpy(b.sha1, dst_other.sha1); b.mode = dst_other.mode; mfi = merge_file(o, &one, &a, &b, branch1, branch2); output(o, 1, "Adding merged %s", ren1_dst); update_file(o, 0, mfi.sha, mfi.mode, ren1_dst); } else { new_path = unique_path(o, ren1_dst, branch2); output(o, 1, "Adding as %s instead", new_path); update_file(o, 0, dst_other.sha1, dst_other.mode, new_path); } } else if ((item = string_list_lookup(ren1_dst, renames2Dst))) { ren2 = item->util; clean_merge = 0; ren2->processed = 1; output(o, 1, "CONFLICT (rename/rename): " "Rename %s->%s in %s. " "Rename %s->%s in %s", ren1_src, ren1_dst, branch1, ren2->pair->one->path, ren2->pair->two->path, branch2); conflict_rename_rename_2(o, ren1, branch1, ren2, branch2); } else try_merge = 1; if (try_merge) { struct diff_filespec *one, *a, *b; struct merge_file_info mfi; 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; } mfi = merge_file(o, one, a, b, o->branch1, o->branch2); if (mfi.clean && sha_eq(mfi.sha, ren1->pair->two->sha1) && mfi.mode == ren1->pair->two->mode) /* * This messaged is part of * t6022 test. If you change * it update the test too. */ output(o, 3, "Skipped %s (merged same as existing)", ren1_dst); else { if (mfi.merge || !mfi.clean) output(o, 1, "Renaming %s => %s", ren1_src, ren1_dst); if (mfi.merge) output(o, 2, "Auto-merging %s", ren1_dst); if (!mfi.clean) { output(o, 1, "CONFLICT (rename/modify): Merge conflict in %s", ren1_dst); clean_merge = 0; if (!o->call_depth) update_stages(ren1_dst, one, a, b, 1); } update_file(o, mfi.clean, mfi.sha, mfi.mode, ren1_dst); } } } } string_list_clear(&a_by_dst, 0); string_list_clear(&b_by_dst, 0); return clean_merge; } static unsigned char *stage_sha(const unsigned char *sha, unsigned mode) { return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha; } static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst) { void *buf; enum object_type type; unsigned long size; buf = read_sha1_file(sha1, &type, &size); if (!buf) return error("cannot read object %s", sha1_to_hex(sha1)); if (type != OBJ_BLOB) { free(buf); return error("object %s is not a blob", sha1_to_hex(sha1)); } strbuf_attach(dst, buf, size, size + 1); return 0; } static int blob_unchanged(const unsigned char *o_sha, const unsigned char *a_sha, const char *path) { struct strbuf o = STRBUF_INIT; struct strbuf a = STRBUF_INIT; int ret = 0; /* assume changed for safety */ if (sha_eq(o_sha, a_sha)) return 1; if (!merge_renormalize) return 0; assert(o_sha && a_sha); if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &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(path, o.buf, o.len, &o) | renormalize_buffer(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; } /* Per entry merge function */ static int process_entry(struct merge_options *o, const char *path, struct stage_data *entry) { /* printf("processing entry, clean cache: %s\n", index_only ? "yes": "no"); print_index_entry("\tpath: ", entry); */ int clean_merge = 1; unsigned o_mode = entry->stages[1].mode; unsigned a_mode = entry->stages[2].mode; unsigned b_mode = entry->stages[3].mode; unsigned char *o_sha = stage_sha(entry->stages[1].sha, o_mode); unsigned char *a_sha = stage_sha(entry->stages[2].sha, a_mode); unsigned char *b_sha = stage_sha(entry->stages[3].sha, b_mode); if (o_sha && (!a_sha || !b_sha)) { /* Case A: Deleted in one */ if ((!a_sha && !b_sha) || (!b_sha && blob_unchanged(o_sha, a_sha, path)) || (!a_sha && blob_unchanged(o_sha, b_sha, path))) { /* Deleted in both or deleted in one and * unchanged in the other */ if (a_sha) output(o, 2, "Removing %s", path); /* do not touch working file if it did not exist */ remove_file(o, 1, path, !a_sha); } else { /* Deleted in one and changed in the other */ clean_merge = 0; if (!a_sha) { output(o, 1, "CONFLICT (delete/modify): %s deleted in %s " "and modified in %s. Version %s of %s left in tree.", path, o->branch1, o->branch2, o->branch2, path); update_file(o, 0, b_sha, b_mode, path); } else { output(o, 1, "CONFLICT (delete/modify): %s deleted in %s " "and modified in %s. Version %s of %s left in tree.", path, o->branch2, o->branch1, o->branch1, path); update_file(o, 0, a_sha, a_mode, path); } } } else if ((!o_sha && a_sha && !b_sha) || (!o_sha && !a_sha && b_sha)) { /* Case B: Added in one. */ const char *add_branch; const char *other_branch; unsigned mode; const unsigned char *sha; const char *conf; if (a_sha) { add_branch = o->branch1; other_branch = o->branch2; mode = a_mode; sha = a_sha; conf = "file/directory"; } else { add_branch = o->branch2; other_branch = o->branch1; mode = b_mode; sha = b_sha; conf = "directory/file"; } if (string_list_has_string(&o->current_directory_set, path)) { const 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); remove_file(o, 0, path, 0); update_file(o, 0, sha, mode, new_path); } else { output(o, 2, "Adding %s", path); update_file(o, 1, sha, mode, path); } } else if (a_sha && b_sha) { /* Case C: Added in both (check for same permissions) and */ /* case D: Modified in both, but differently. */ const char *reason = "content"; struct merge_file_info mfi; struct diff_filespec one, a, b; if (!o_sha) { reason = "add/add"; o_sha = (unsigned char *)null_sha1; } output(o, 2, "Auto-merging %s", path); one.path = a.path = b.path = (char *)path; hashcpy(one.sha1, o_sha); one.mode = o_mode; hashcpy(a.sha1, a_sha); a.mode = a_mode; hashcpy(b.sha1, b_sha); b.mode = b_mode; mfi = merge_file(o, &one, &a, &b, o->branch1, o->branch2); clean_merge = mfi.clean; if (!mfi.clean) { if (S_ISGITLINK(mfi.mode)) reason = "submodule"; output(o, 1, "CONFLICT (%s): Merge conflict in %s", reason, path); } update_file(o, mfi.clean, mfi.sha, mfi.mode, path); } else if (!o_sha && !a_sha && !b_sha) { /* * 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("Fatal merge failure, shouldn't happen."); return clean_merge; } struct unpack_trees_error_msgs get_porcelain_error_msgs(void) { struct unpack_trees_error_msgs msgs = { /* would_overwrite */ "Your local changes to '%s' would be overwritten by merge. Aborting.", /* not_uptodate_file */ "Your local changes to '%s' would be overwritten by merge. Aborting.", /* not_uptodate_dir */ "Updating '%s' would lose untracked files in it. Aborting.", /* would_lose_untracked */ "Untracked working tree file '%s' would be %s by merge. Aborting", /* bind_overlap -- will not happen here */ NULL, }; if (advice_commit_before_merge) { msgs.would_overwrite = msgs.not_uptodate_file = "Your local changes to '%s' would be overwritten by merge. Aborting.\n" "Please, commit your changes or stash them before you can merge."; } return msgs; } 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 (sha_eq(common->object.sha1, merge->object.sha1)) { output(o, 0, "Already uptodate!"); *result = head; return 1; } code = git_merge_trees(o->call_depth, common, head, merge); if (code != 0) { if (show(o, 4) || o->call_depth) die("merging of trees %s and %s failed", sha1_to_hex(head->object.sha1), sha1_to_hex(merge->object.sha1)); else exit(128); } if (unmerged_cache()) { struct string_list *entries, *re_head, *re_merge; int i; string_list_clear(&o->current_file_set, 1); string_list_clear(&o->current_directory_set, 1); 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); for (i = 0; i < entries->nr; i++) { const char *path = entries->items[i].string; struct stage_data *e = entries->items[i].util; if (!e->processed && !process_entry(o, path, e)) clean = 0; } string_list_clear(re_merge, 0); string_list_clear(re_head, 0); string_list_clear(entries, 1); } else clean = 1; if (o->call_depth) *result = write_tree_from_memory(o); 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 = 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, 1); ca = reverse_commit_list(ca); } if (show(o, 5)) { output(o, 5, "found %u common ancestor(s):", commit_list_count(ca)); 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, make an empty tree */ struct tree *tree = xcalloc(1, sizeof(struct tree)); tree->object.parsed = 1; tree->object.type = OBJ_TREE; pretend_sha1_file(NULL, 0, OBJ_TREE, tree->object.sha1); 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, 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"; merge_recursive(o, merged_common_ancestors, iter->item, NULL, &merged_common_ancestors); o->branch1 = saved_b1; o->branch2 = saved_b2; o->call_depth--; if (!merged_common_ancestors) die("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 (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); return clean; } static struct commit *get_ref(const unsigned char *sha1, const char *name) { struct object *object; object = deref_tag(parse_object(sha1), 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 unsigned char *head, const unsigned char *merge, int num_base_list, const unsigned char **base_list, struct commit **result) { int clean, index_fd; struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); 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], sha1_to_hex(base_list[i])))) return error("Could not parse object '%s'", sha1_to_hex(base_list[i])); commit_list_insert(base, &ca); } } index_fd = hold_locked_index(lock, 1); clean = merge_recursive(o, head_commit, next_commit, ca, result); if (active_cache_changed && (write_cache(index_fd, active_cache, active_nr) || commit_locked_index(lock))) return error("Unable to write index."); return clean ? 0 : 1; } static int merge_recursive_config(const char *var, const char *value, void *cb) { struct merge_options *o = cb; if (!strcasecmp(var, "merge.verbosity")) { o->verbosity = git_config_int(var, value); return 0; } if (!strcasecmp(var, "diff.renamelimit")) { o->diff_rename_limit = git_config_int(var, value); return 0; } if (!strcasecmp(var, "merge.renamelimit")) { o->merge_rename_limit = git_config_int(var, value); return 0; } return git_xmerge_config(var, value, cb); } void init_merge_options(struct merge_options *o) { memset(o, 0, sizeof(struct merge_options)); o->verbosity = 2; o->buffer_output = 1; o->diff_rename_limit = -1; o->merge_rename_limit = -1; git_config(merge_recursive_config, o); if (getenv("GIT_MERGE_VERBOSITY")) o->verbosity = strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10); if (o->verbosity >= 5) o->buffer_output = 0; strbuf_init(&o->obuf, 0); memset(&o->current_file_set, 0, sizeof(struct string_list)); o->current_file_set.strdup_strings = 1; memset(&o->current_directory_set, 0, sizeof(struct string_list)); o->current_directory_set.strdup_strings = 1; }