From: Junio C Hamano Date: Wed, 27 Feb 2008 20:53:26 +0000 (-0800) Subject: Merge branch 'db/checkout' X-Git-Tag: v1.5.5-rc0~133 X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=5a4d707a6d914fcea302e299fc18892d9e42c767;p=git.git Merge branch 'db/checkout' * db/checkout: (21 commits) checkout: error out when index is unmerged even with -m checkout: show progress when checkout takes long time while switching branches Add merge-subtree back checkout: updates to tracking report builtin-checkout.c: Remove unused prefix arguments in switch_branches path checkout: work from a subdirectory checkout: tone down the "forked status" diagnostic messages Clean up reporting differences on branch switch builtin-checkout.c: fix possible usage segfault checkout: notice when the switched branch is behind or forked Build in checkout Move code to clean up after a branch change to branch.c Library function to check for unmerged index entries Use diff -u instead of diff in t7201 Move create_branch into a library file Build-in merge-recursive Add "skip_unmerged" option to unpack_trees. Discard "deleted" cache entries after using them to update the working tree Send unpack-trees debugging output to stderr Add flag to make unpack_trees() not print errors. ... Conflicts: Makefile --- 5a4d707a6d914fcea302e299fc18892d9e42c767 diff --cc Makefile index 8d9f11e75,40fa41b5f..a5b6eebf1 --- a/Makefile +++ b/Makefile @@@ -327,8 -318,7 +327,8 @@@ LIB_OBJS = alloc.o merge-file.o path-list.o help.o unpack-trees.o $(DIFF_OBJS) \ color.o wt-status.o archive-zip.o archive-tar.o shallow.o utf8.o \ convert.o attr.o decorate.o progress.o mailmap.o symlinks.o remote.o \ - transport.o bundle.o walker.o parse-options.o ws.o archive.o \ - transport.o bundle.o walker.o parse-options.o ws.o archive.o branch.o ++ transport.o bundle.o walker.o parse-options.o ws.o archive.o branch.o \ + alias.o BUILTIN_OBJS = \ builtin-add.o \ diff --cc builtin-merge-recursive.c index 000000000,558a58e4d..6fe4102c0 mode 000000,100644..100644 --- a/builtin-merge-recursive.c +++ b/builtin-merge-recursive.c @@@ -1,0 -1,1751 +1,1754 @@@ + /* + * 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 "cache-tree.h" + #include "commit.h" + #include "blob.h" + #include "builtin.h" + #include "tree-walk.h" + #include "diff.h" + #include "diffcore.h" + #include "run-command.h" + #include "tag.h" + #include "unpack-trees.h" + #include "path-list.h" + #include "xdiff-interface.h" + #include "interpolate.h" + #include "attr.h" + #include "merge-recursive.h" + + static int subtree_merge; + + static struct tree *shift_tree_object(struct tree *one, struct tree *two) + { + unsigned char shifted[20]; + + /* + * NEEDSWORK: this limits the recursion depth to hardcoded + * value '2' to avoid excessive overhead. + */ + shift_tree(one->object.sha1, two->object.sha1, shifted, 2); + if (!hashcmp(two->object.sha1, shifted)) + return two; + return lookup_tree(shifted); + } + + /* + * A virtual commit has + * - (const char *)commit->util set to the name, and + * - *(int *)commit->object.sha1 set to the virtual id. + */ + + static unsigned commit_list_count(const struct commit_list *l) + { + unsigned c = 0; + for (; l; l = l->next ) + c++; + return c; + } + + static struct commit *make_virtual_commit(struct tree *tree, const char *comment) + { + struct commit *commit = xcalloc(1, sizeof(struct commit)); + static unsigned virtual_id = 1; + commit->tree = tree; + commit->util = (void*)comment; + *(int*)commit->object.sha1 = virtual_id++; + /* 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 struct path_list current_file_set = {NULL, 0, 0, 1}; + static struct path_list current_directory_set = {NULL, 0, 0, 1}; + + static int call_depth = 0; + static int verbosity = 2; + static int rename_limit = -1; + static int buffer_output = 1; + static struct strbuf obuf = STRBUF_INIT; + + static int show(int v) + { + return (!call_depth && verbosity >= v) || verbosity >= 5; + } + + static void flush_output(void) + { + if (obuf.len) { + fputs(obuf.buf, stdout); + strbuf_reset(&obuf); + } + } + + static void output(int v, const char *fmt, ...) + { + int len; + va_list ap; + + if (!show(v)) + return; + + strbuf_grow(&obuf, call_depth * 2 + 2); + memset(obuf.buf + obuf.len, ' ', call_depth * 2); + strbuf_setlen(&obuf, obuf.len + call_depth * 2); + + va_start(ap, fmt); + len = vsnprintf(obuf.buf + obuf.len, strbuf_avail(&obuf), fmt, ap); + va_end(ap); + + if (len < 0) + len = 0; + if (len >= strbuf_avail(&obuf)) { + strbuf_grow(&obuf, len + 2); + va_start(ap, fmt); + len = vsnprintf(obuf.buf + obuf.len, strbuf_avail(&obuf), fmt, ap); + va_end(ap); + if (len >= strbuf_avail(&obuf)) { + die("this should not happen, your snprintf is broken"); + } + } + strbuf_setlen(&obuf, obuf.len + len); + strbuf_add(&obuf, "\n", 1); + if (!buffer_output) + flush_output(); + } + + static void output_commit_title(struct commit *commit) + { + int i; + flush_output(); + for (i = 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); + } + + /* + * This is a global variable which is used in a number of places but + * only written to in the 'merge' function. + * + * index_only == 1 => Don't leave any non-stage 0 entries in the cache and + * don't update the working directory. + * 0 => Leave unmerged entries in the cache and update + * the working directory. + */ + static int index_only = 0; + + 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; + + 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(void) + { + struct tree *result = NULL; + + if (unmerged_cache()) { + int i; + output(0, "There are unmerged index entries:"); + for (i = 0; i < active_nr; i++) { + struct cache_entry *ce = active_cache[i]; + if (ce_stage(ce)) + output(0, "%d %.*s", ce_stage(ce), ce_namelen(ce), ce->name); + } + return NULL; + } + + 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) + { + int len = strlen(path); + char *newpath = xmalloc(baselen + len + 1); + memcpy(newpath, base, baselen); + memcpy(newpath + baselen, path, len); + newpath[baselen + len] = '\0'; + + if (S_ISDIR(mode)) + path_list_insert(newpath, ¤t_directory_set); + else + path_list_insert(newpath, ¤t_file_set); + free(newpath); + + return READ_TREE_RECURSIVE; + } + + static int get_files_dirs(struct tree *tree) + { + int n; + if (read_tree_recursive(tree, "", 0, 0, NULL, save_files_dirs) != 0) + return 0; + n = current_file_set.nr + 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 path_list *entries) + { + struct path_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 = path_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 path_list *get_unmerged(void) + { + struct path_list *unmerged = xcalloc(1, sizeof(struct path_list)); + int i; + + unmerged->strdup_paths = 1; + + for (i = 0; i < active_nr; i++) { + struct path_list_item *item; + struct stage_data *e; + struct cache_entry *ce = active_cache[i]; + if (!ce_stage(ce)) + continue; + + item = path_list_lookup(ce->name, unmerged); + if (!item) { + item = path_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 path_list *get_renames(struct tree *tree, + struct tree *o_tree, + struct tree *a_tree, + struct tree *b_tree, + struct path_list *entries) + { + int i; + struct path_list *renames; + struct diff_options opts; + + renames = xcalloc(1, sizeof(struct path_list)); + diff_setup(&opts); + DIFF_OPT_SET(&opts, RECURSIVE); + opts.detect_rename = DIFF_DETECT_RENAME; + opts.rename_limit = rename_limit; + 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 path_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 = path_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 = path_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 = path_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_path(const char *name) + { + int ret; + char *slash, *dirs; + + ret = unlink(name); + if (ret) + return ret; + dirs = xstrdup(name); + while ((slash = strrchr(name, '/'))) { + *slash = '\0'; + if (rmdir(name) != 0) + break; + } + free(dirs); + return ret; + } + + static int remove_file(int clean, const char *path, int no_wd) + { + int update_cache = index_only || clean; + int update_working_directory = !index_only && !no_wd; + + if (update_cache) { + if (remove_file_from_cache(path)) + return -1; + } + if (update_working_directory) { + unlink(path); + if (errno != ENOENT || errno != EISDIR) + return -1; + remove_path(path); + } + return 0; + } + + static char *unique_path(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 (path_list_has_path(¤t_file_set, newpath) || + path_list_has_path(¤t_directory_set, newpath) || + lstat(newpath, &st) == 0) + sprintf(p, "_%d", suffix++); + + path_list_insert(newpath, ¤t_file_set); + return newpath; + } + + static int mkdir_p(const char *path, unsigned long mode) + { + /* path points to cache entries, so xstrdup before messing with it */ + char *buf = xstrdup(path); + int result = safe_create_leading_directories(buf); + free(buf); + return result; + } + + 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("merge-recursive: %s", strerror(errno)); + } else if (!ret) { + die("merge-recursive: disk full?"); + } + size -= ret; + buf += ret; + } + } + + static int make_room_for_path(const char *path) + { + int status; + const char *msg = "failed to create path '%s'%s"; + + status = mkdir_p(path, 0777); + if (status) { + if (status == -3) { + /* something else exists */ + error(msg, path, ": perhaps a D/F conflict?"); + return -1; + } + die(msg, 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(const unsigned char *sha, + unsigned mode, + const char *path, + int update_cache, + int update_wd) + { + if (index_only) + update_wd = 0; + + if (update_wd) { + enum object_type type; + void *buf; + unsigned long size; + + if (S_ISGITLINK(mode)) + die("cannot read object %s '%s': It is a submodule!", + sha1_to_hex(sha), path); + + 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 (make_room_for_path(path) < 0) { + update_wd = 0; + 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("failed to open %s: %s", path, strerror(errno)); + flush_buffer(fd, buf, size); + close(fd); + } else if (S_ISLNK(mode)) { + char *lnk = xmemdupz(buf, size); + mkdir_p(path, 0777); + unlink(path); + symlink(lnk, path); + free(lnk); + } else + die("do not know what to do with %06o %s '%s'", + mode, sha1_to_hex(sha), path); + } + update_index: + if (update_cache) + add_cacheinfo(mode, sha, path, 0, update_wd, ADD_CACHE_OK_TO_ADD); + } + + static void update_file(int clean, + const unsigned char *sha, + unsigned mode, + const char *path) + { + update_file_flags(sha, mode, path, index_only || clean, !index_only); + } + + /* Low level file merging, update and removal */ + + struct merge_file_info + { + unsigned char sha[20]; + unsigned mode; + unsigned clean:1, + merge:1; + }; + + static void fill_mm(const unsigned char *sha1, mmfile_t *mm) + { + unsigned long size; + enum object_type type; + + if (!hashcmp(sha1, null_sha1)) { + mm->ptr = xstrdup(""); + mm->size = 0; + return; + } + + mm->ptr = read_sha1_file(sha1, &type, &size); + if (!mm->ptr || type != OBJ_BLOB) + die("unable to read blob object %s", sha1_to_hex(sha1)); + mm->size = size; + } + + /* + * Customizable low-level merge drivers support. + */ + + struct ll_merge_driver; + typedef int (*ll_merge_fn)(const struct ll_merge_driver *, + const char *path, + mmfile_t *orig, + mmfile_t *src1, const char *name1, + mmfile_t *src2, const char *name2, + mmbuffer_t *result); + + struct ll_merge_driver { + const char *name; + const char *description; + ll_merge_fn fn; + const char *recursive; + struct ll_merge_driver *next; + char *cmdline; + }; + + /* + * Built-in low-levels + */ + static int ll_binary_merge(const struct ll_merge_driver *drv_unused, + const char *path_unused, + mmfile_t *orig, + mmfile_t *src1, const char *name1, + mmfile_t *src2, const char *name2, + mmbuffer_t *result) + { + /* + * The tentative merge result is "ours" for the final round, + * or common ancestor for an internal merge. Still return + * "conflicted merge" status. + */ + mmfile_t *stolen = index_only ? orig : src1; + + result->ptr = stolen->ptr; + result->size = stolen->size; + stolen->ptr = NULL; + return 1; + } + + static int ll_xdl_merge(const struct ll_merge_driver *drv_unused, + const char *path_unused, + mmfile_t *orig, + mmfile_t *src1, const char *name1, + mmfile_t *src2, const char *name2, + mmbuffer_t *result) + { + xpparam_t xpp; + + if (buffer_is_binary(orig->ptr, orig->size) || + buffer_is_binary(src1->ptr, src1->size) || + buffer_is_binary(src2->ptr, src2->size)) { + warning("Cannot merge binary files: %s vs. %s\n", + name1, name2); + return ll_binary_merge(drv_unused, path_unused, + orig, src1, name1, + src2, name2, + result); + } + + memset(&xpp, 0, sizeof(xpp)); + return xdl_merge(orig, + src1, name1, + src2, name2, + &xpp, XDL_MERGE_ZEALOUS, + result); + } + + static int ll_union_merge(const struct ll_merge_driver *drv_unused, + const char *path_unused, + mmfile_t *orig, + mmfile_t *src1, const char *name1, + mmfile_t *src2, const char *name2, + mmbuffer_t *result) + { + char *src, *dst; + long size; + const int marker_size = 7; + + int status = ll_xdl_merge(drv_unused, path_unused, + orig, src1, NULL, src2, NULL, result); + if (status <= 0) + return status; + size = result->size; + src = dst = result->ptr; + while (size) { + char ch; + if ((marker_size < size) && + (*src == '<' || *src == '=' || *src == '>')) { + int i; + ch = *src; + for (i = 0; i < marker_size; i++) + if (src[i] != ch) + goto not_a_marker; + if (src[marker_size] != '\n') + goto not_a_marker; + src += marker_size + 1; + size -= marker_size + 1; + continue; + } + not_a_marker: + do { + ch = *src++; + *dst++ = ch; + size--; + } while (ch != '\n' && size); + } + result->size = dst - result->ptr; + return 0; + } + + #define LL_BINARY_MERGE 0 + #define LL_TEXT_MERGE 1 + #define LL_UNION_MERGE 2 + static struct ll_merge_driver ll_merge_drv[] = { + { "binary", "built-in binary merge", ll_binary_merge }, + { "text", "built-in 3-way text merge", ll_xdl_merge }, + { "union", "built-in union merge", ll_union_merge }, + }; + + static void create_temp(mmfile_t *src, char *path) + { + int fd; + + strcpy(path, ".merge_file_XXXXXX"); + fd = xmkstemp(path); + if (write_in_full(fd, src->ptr, src->size) != src->size) + die("unable to write temp-file"); + close(fd); + } + + /* + * User defined low-level merge driver support. + */ + static int ll_ext_merge(const struct ll_merge_driver *fn, + const char *path, + mmfile_t *orig, + mmfile_t *src1, const char *name1, + mmfile_t *src2, const char *name2, + mmbuffer_t *result) + { + char temp[3][50]; + char cmdbuf[2048]; + struct interp table[] = { + { "%O" }, + { "%A" }, + { "%B" }, + }; + struct child_process child; + const char *args[20]; + int status, fd, i; + struct stat st; + + if (fn->cmdline == NULL) + die("custom merge driver %s lacks command line.", fn->name); + + result->ptr = NULL; + result->size = 0; + create_temp(orig, temp[0]); + create_temp(src1, temp[1]); + create_temp(src2, temp[2]); + + interp_set_entry(table, 0, temp[0]); + interp_set_entry(table, 1, temp[1]); + interp_set_entry(table, 2, temp[2]); + + output(1, "merging %s using %s", path, + fn->description ? fn->description : fn->name); + + interpolate(cmdbuf, sizeof(cmdbuf), fn->cmdline, table, 3); + + memset(&child, 0, sizeof(child)); + child.argv = args; + args[0] = "sh"; + args[1] = "-c"; + args[2] = cmdbuf; + args[3] = NULL; + + status = run_command(&child); + if (status < -ERR_RUN_COMMAND_FORK) + ; /* failure in run-command */ + else + status = -status; + fd = open(temp[1], O_RDONLY); + if (fd < 0) + goto bad; + if (fstat(fd, &st)) + goto close_bad; + result->size = st.st_size; + result->ptr = xmalloc(result->size + 1); + if (read_in_full(fd, result->ptr, result->size) != result->size) { + free(result->ptr); + result->ptr = NULL; + result->size = 0; + } + close_bad: + close(fd); + bad: + for (i = 0; i < 3; i++) + unlink(temp[i]); + return status; + } + + /* + * merge.default and merge.driver configuration items + */ + static struct ll_merge_driver *ll_user_merge, **ll_user_merge_tail; + static const char *default_ll_merge; + + static int read_merge_config(const char *var, const char *value) + { + struct ll_merge_driver *fn; + const char *ep, *name; + int namelen; + + if (!strcmp(var, "merge.default")) { - if (value) - default_ll_merge = strdup(value); ++ if (!value) ++ return config_error_nonbool(var); ++ default_ll_merge = strdup(value); + return 0; + } + + /* + * We are not interested in anything but "merge..variable"; + * especially, we do not want to look at variables such as + * "merge.summary", "merge.tool", and "merge.verbosity". + */ + if (prefixcmp(var, "merge.") || (ep = strrchr(var, '.')) == var + 5) + return 0; + + /* + * Find existing one as we might be processing merge..var2 + * after seeing merge..var1. + */ + name = var + 6; + namelen = ep - name; + for (fn = ll_user_merge; fn; fn = fn->next) + if (!strncmp(fn->name, name, namelen) && !fn->name[namelen]) + break; + if (!fn) { + fn = xcalloc(1, sizeof(struct ll_merge_driver)); + fn->name = xmemdupz(name, namelen); + fn->fn = ll_ext_merge; + *ll_user_merge_tail = fn; + ll_user_merge_tail = &(fn->next); + } + + ep++; + + if (!strcmp("name", ep)) { + if (!value) - return error("%s: lacks value", var); ++ return config_error_nonbool(var); + fn->description = strdup(value); + return 0; + } + + if (!strcmp("driver", ep)) { + if (!value) - return error("%s: lacks value", var); ++ return config_error_nonbool(var); + /* + * merge..driver specifies the command line: + * + * command-line + * + * The command-line will be interpolated with the following + * tokens and is given to the shell: + * + * %O - temporary file name for the merge base. + * %A - temporary file name for our version. + * %B - temporary file name for the other branches' version. + * + * The external merge driver should write the results in the + * file named by %A, and signal that it has done with zero exit + * status. + */ + fn->cmdline = strdup(value); + return 0; + } + + if (!strcmp("recursive", ep)) { + if (!value) - return error("%s: lacks value", var); ++ return config_error_nonbool(var); + fn->recursive = strdup(value); + return 0; + } + + return 0; + } + + static void initialize_ll_merge(void) + { + if (ll_user_merge_tail) + return; + ll_user_merge_tail = &ll_user_merge; + git_config(read_merge_config); + } + + static const struct ll_merge_driver *find_ll_merge_driver(const char *merge_attr) + { + struct ll_merge_driver *fn; + const char *name; + int i; + + initialize_ll_merge(); + + if (ATTR_TRUE(merge_attr)) + return &ll_merge_drv[LL_TEXT_MERGE]; + else if (ATTR_FALSE(merge_attr)) + return &ll_merge_drv[LL_BINARY_MERGE]; + else if (ATTR_UNSET(merge_attr)) { + if (!default_ll_merge) + return &ll_merge_drv[LL_TEXT_MERGE]; + else + name = default_ll_merge; + } + else + name = merge_attr; + + for (fn = ll_user_merge; fn; fn = fn->next) + if (!strcmp(fn->name, name)) + return fn; + + for (i = 0; i < ARRAY_SIZE(ll_merge_drv); i++) + if (!strcmp(ll_merge_drv[i].name, name)) + return &ll_merge_drv[i]; + + /* default to the 3-way */ + return &ll_merge_drv[LL_TEXT_MERGE]; + } + + static const char *git_path_check_merge(const char *path) + { + static struct git_attr_check attr_merge_check; + + if (!attr_merge_check.attr) + attr_merge_check.attr = git_attr("merge", 5); + + if (git_checkattr(path, 1, &attr_merge_check)) + return NULL; + return attr_merge_check.value; + } + + static int ll_merge(mmbuffer_t *result_buf, + struct diff_filespec *o, + struct diff_filespec *a, + struct diff_filespec *b, + const char *branch1, + const char *branch2) + { + mmfile_t orig, src1, src2; + char *name1, *name2; + int merge_status; + const char *ll_driver_name; + const struct ll_merge_driver *driver; + + name1 = xstrdup(mkpath("%s:%s", branch1, a->path)); + name2 = xstrdup(mkpath("%s:%s", branch2, b->path)); + + fill_mm(o->sha1, &orig); + fill_mm(a->sha1, &src1); + fill_mm(b->sha1, &src2); + + ll_driver_name = git_path_check_merge(a->path); + driver = find_ll_merge_driver(ll_driver_name); + + if (index_only && driver->recursive) + driver = find_ll_merge_driver(driver->recursive); + merge_status = driver->fn(driver, a->path, + &orig, &src1, name1, &src2, name2, + result_buf); + + free(name1); + free(name2); + free(orig.ptr); + free(src1.ptr); + free(src2.ptr); + return merge_status; + } + + static struct merge_file_info merge_file(struct diff_filespec *o, + 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, o->sha1) && !sha_eq(b->sha1, o->sha1)) + result.merge = 1; + + result.mode = a->mode == o->mode ? b->mode: a->mode; + + if (sha_eq(a->sha1, o->sha1)) + hashcpy(result.sha, b->sha1); + else if (sha_eq(b->sha1, o->sha1)) + hashcpy(result.sha, a->sha1); + else if (S_ISREG(a->mode)) { + mmbuffer_t result_buf; + int merge_status; + + merge_status = ll_merge(&result_buf, o, 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 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 (path_list_has_path(¤t_directory_set, ren1_dst)) { + dst_name1 = del[delp++] = unique_path(ren1_dst, branch1); + output(1, "%s is a directory in %s added as %s instead", + ren1_dst, branch2, dst_name1); + remove_file(0, ren1_dst, 0); + } + if (path_list_has_path(¤t_directory_set, ren2_dst)) { + dst_name2 = del[delp++] = unique_path(ren2_dst, branch2); + output(1, "%s is a directory in %s added as %s instead", + ren2_dst, branch1, dst_name2); + remove_file(0, ren2_dst, 0); + } + if (index_only) { + remove_file_from_cache(dst_name1); + remove_file_from_cache(dst_name2); + /* + * Uncomment to leave the conflicting names in the resulting tree + * + * update_file(0, ren1->pair->two->sha1, ren1->pair->two->mode, dst_name1); + * update_file(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 rename *ren1, + const char *branch1) + { + char *new_path = unique_path(ren1->pair->two->path, branch1); + output(1, "Renamed %s to %s instead", ren1->pair->one->path, new_path); + remove_file(0, ren1->pair->two->path, 0); + update_file(0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path); + free(new_path); + } + + static void conflict_rename_rename_2(struct rename *ren1, + const char *branch1, + struct rename *ren2, + const char *branch2) + { + char *new_path1 = unique_path(ren1->pair->two->path, branch1); + char *new_path2 = unique_path(ren2->pair->two->path, branch2); + output(1, "Renamed %s to %s and %s to %s instead", + ren1->pair->one->path, new_path1, + ren2->pair->one->path, new_path2); + remove_file(0, ren1->pair->two->path, 0); + update_file(0, ren1->pair->two->sha1, ren1->pair->two->mode, new_path1); + update_file(0, ren2->pair->two->sha1, ren2->pair->two->mode, new_path2); + free(new_path2); + free(new_path1); + } + + static int process_renames(struct path_list *a_renames, + struct path_list *b_renames, + const char *a_branch, + const char *b_branch) + { + int clean_merge = 1, i, j; + struct path_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; + path_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; + path_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;) { + int compare; + char *src; + struct path_list *renames1, *renames2, *renames2Dst; + struct rename *ren1 = NULL, *ren2 = NULL; + const char *branch1, *branch2; + const char *ren1_src, *ren1_dst; + + if (i >= a_renames->nr) { + compare = 1; + ren2 = b_renames->items[j++].util; + } else if (j >= b_renames->nr) { + compare = -1; + ren1 = a_renames->items[i++].util; + } else { + compare = strcmp(a_renames->items[i].path, + b_renames->items[j].path); + 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; + renames2 = b_renames; + renames2Dst = &b_by_dst; + branch1 = a_branch; + branch2 = b_branch; + } else { + struct rename *tmp; + renames1 = b_renames; + renames2 = a_renames; + renames2Dst = &a_by_dst; + branch1 = b_branch; + branch2 = a_branch; + 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(1, "CONFLICT (rename/rename): " + "Rename \"%s\"->\"%s\" in branch \"%s\" " + "rename \"%s\"->\"%s\" in \"%s\"%s", + src, ren1_dst, branch1, + src, ren2_dst, branch2, + index_only ? " (left unresolved)": ""); + if (index_only) { + remove_file_from_cache(src); + update_file(0, ren1->pair->one->sha1, + ren1->pair->one->mode, src); + } + conflict_rename_rename(ren1, branch1, ren2, branch2); + } else { + struct merge_file_info mfi; + remove_file(1, ren1_src, 1); + mfi = merge_file(ren1->pair->one, + ren1->pair->two, + ren2->pair->two, + branch1, + branch2); + if (mfi.merge || !mfi.clean) + output(1, "Renamed %s->%s", src, ren1_dst); + + if (mfi.merge) + output(2, "Auto-merged %s", ren1_dst); + + if (!mfi.clean) { + output(1, "CONFLICT (content): merge conflict in %s", + ren1_dst); + clean_merge = 0; + + if (!index_only) + update_stages(ren1_dst, + ren1->pair->one, + ren1->pair->two, + ren2->pair->two, + 1 /* clear */); + } + update_file(mfi.clean, mfi.sha, mfi.mode, ren1_dst); + } + } else { + /* Renamed in 1, maybe changed in 2 */ + struct path_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(1, ren1_src, index_only || 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 (path_list_has_path(¤t_directory_set, ren1_dst)) { + clean_merge = 0; + output(1, "CONFLICT (rename/directory): Renamed %s->%s in %s " + " directory %s added in %s", + ren1_src, ren1_dst, branch1, + ren1_dst, branch2); + conflict_rename_dir(ren1, branch1); + } else if (sha_eq(src_other.sha1, null_sha1)) { + clean_merge = 0; + output(1, "CONFLICT (rename/delete): Renamed %s->%s in %s " + "and deleted in %s", + ren1_src, ren1_dst, branch1, + branch2); + update_file(0, ren1->pair->two->sha1, ren1->pair->two->mode, ren1_dst); + } else if (!sha_eq(dst_other.sha1, null_sha1)) { + const char *new_path; + clean_merge = 0; + try_merge = 1; + output(1, "CONFLICT (rename/add): Renamed %s->%s in %s. " + "%s added in %s", + ren1_src, ren1_dst, branch1, + ren1_dst, branch2); + new_path = unique_path(ren1_dst, branch2); + output(1, "Added as %s instead", new_path); + update_file(0, dst_other.sha1, dst_other.mode, new_path); + } else if ((item = path_list_lookup(ren1_dst, renames2Dst))) { + ren2 = item->util; + clean_merge = 0; + ren2->processed = 1; + output(1, "CONFLICT (rename/rename): Renamed %s->%s in %s. " + "Renamed %s->%s in %s", + ren1_src, ren1_dst, branch1, + ren2->pair->one->path, ren2->pair->two->path, branch2); + conflict_rename_rename_2(ren1, branch1, ren2, branch2); + } else + try_merge = 1; + + if (try_merge) { + struct diff_filespec *o, *a, *b; + struct merge_file_info mfi; + src_other.path = (char *)ren1_src; + + o = 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, a, b, + a_branch, b_branch); + + 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(3, "Skipped %s (merged same as existing)", ren1_dst); + else { + if (mfi.merge || !mfi.clean) + output(1, "Renamed %s => %s", ren1_src, ren1_dst); + if (mfi.merge) + output(2, "Auto-merged %s", ren1_dst); + if (!mfi.clean) { + output(1, "CONFLICT (rename/modify): Merge conflict in %s", + ren1_dst); + clean_merge = 0; + + if (!index_only) + update_stages(ren1_dst, + o, a, b, 1); + } + update_file(mfi.clean, mfi.sha, mfi.mode, ren1_dst); + } + } + } + } + path_list_clear(&a_by_dst, 0); + path_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; + } + + /* Per entry merge function */ + static int process_entry(const char *path, struct stage_data *entry, + const char *branch1, + const char *branch2) + { + /* + 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) || + (sha_eq(a_sha, o_sha) && !b_sha) || + (!a_sha && sha_eq(b_sha, o_sha))) { + /* Deleted in both or deleted in one and + * unchanged in the other */ + if (a_sha) + output(2, "Removed %s", path); + /* do not touch working file if it did not exist */ + remove_file(1, path, !a_sha); + } else { + /* Deleted in one and changed in the other */ + clean_merge = 0; + if (!a_sha) { + output(1, "CONFLICT (delete/modify): %s deleted in %s " + "and modified in %s. Version %s of %s left in tree.", + path, branch1, + branch2, branch2, path); + update_file(0, b_sha, b_mode, path); + } else { + output(1, "CONFLICT (delete/modify): %s deleted in %s " + "and modified in %s. Version %s of %s left in tree.", + path, branch2, + branch1, branch1, path); + update_file(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 = branch1; + other_branch = branch2; + mode = a_mode; + sha = a_sha; + conf = "file/directory"; + } else { + add_branch = branch2; + other_branch = branch1; + mode = b_mode; + sha = b_sha; + conf = "directory/file"; + } + if (path_list_has_path(¤t_directory_set, path)) { + const char *new_path = unique_path(path, add_branch); + clean_merge = 0; + output(1, "CONFLICT (%s): There is a directory with name %s in %s. " + "Added %s as %s", + conf, path, other_branch, path, new_path); + remove_file(0, path, 0); + update_file(0, sha, mode, new_path); + } else { + output(2, "Added %s", path); + update_file(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 o, a, b; + + if (!o_sha) { + reason = "add/add"; + o_sha = (unsigned char *)null_sha1; + } + output(2, "Auto-merged %s", path); + o.path = a.path = b.path = (char *)path; + hashcpy(o.sha1, o_sha); + o.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, &a, &b, + branch1, branch2); + + clean_merge = mfi.clean; + if (mfi.clean) + update_file(1, mfi.sha, mfi.mode, path); + else if (S_ISGITLINK(mfi.mode)) + output(1, "CONFLICT (submodule): Merge conflict in %s " + "- needs %s", path, sha1_to_hex(b.sha1)); + else { + output(1, "CONFLICT (%s): Merge conflict in %s", + reason, path); + + if (index_only) + update_file(0, mfi.sha, mfi.mode, path); + else + update_file_flags(mfi.sha, mfi.mode, path, + 0 /* update_cache */, 1 /* update_working_directory */); + } + } 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(1, path, !a_mode); + } else + die("Fatal merge failure, shouldn't happen."); + + return clean_merge; + } + + int merge_trees(struct tree *head, + struct tree *merge, + struct tree *common, + const char *branch1, + const char *branch2, + struct tree **result) + { + int code, clean; + + if (subtree_merge) { + merge = shift_tree_object(head, merge); + common = shift_tree_object(head, common); + } + + if (sha_eq(common->object.sha1, merge->object.sha1)) { + output(0, "Already uptodate!"); + *result = head; + return 1; + } + + code = git_merge_trees(index_only, common, head, merge); + + if (code != 0) + die("merging of trees %s and %s failed", + sha1_to_hex(head->object.sha1), + sha1_to_hex(merge->object.sha1)); + + if (unmerged_cache()) { + struct path_list *entries, *re_head, *re_merge; + int i; + path_list_clear(¤t_file_set, 1); + path_list_clear(¤t_directory_set, 1); + get_files_dirs(head); + get_files_dirs(merge); + + entries = get_unmerged(); + re_head = get_renames(head, common, head, merge, entries); + re_merge = get_renames(merge, common, head, merge, entries); + clean = process_renames(re_head, re_merge, + branch1, branch2); + for (i = 0; i < entries->nr; i++) { + const char *path = entries->items[i].path; + struct stage_data *e = entries->items[i].util; + if (!e->processed + && !process_entry(path, e, branch1, branch2)) + clean = 0; + } + + path_list_clear(re_merge, 0); + path_list_clear(re_head, 0); + path_list_clear(entries, 1); + + } + else + clean = 1; + + if (index_only) + *result = write_tree_from_memory(); + + 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 commit *h1, + struct commit *h2, + const char *branch1, + const char *branch2, + struct commit_list *ca, + struct commit **result) + { + struct commit_list *iter; + struct commit *merged_common_ancestors; + struct tree *mrtree = mrtree; + int clean; + + if (show(4)) { + output(4, "Merging:"); + output_commit_title(h1); + output_commit_title(h2); + } + + if (!ca) { + ca = get_merge_bases(h1, h2, 1); + ca = reverse_commit_list(ca); + } + + if (show(5)) { + output(5, "found %u common ancestor(s):", commit_list_count(ca)); + for (iter = ca; iter; iter = iter->next) + output_commit_title(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) { + 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(); + merge_recursive(merged_common_ancestors, iter->item, + "Temporary merge branch 1", + "Temporary merge branch 2", + NULL, + &merged_common_ancestors); + call_depth--; + + if (!merged_common_ancestors) + die("merge returned no commit"); + } + + discard_cache(); + if (!call_depth) { + read_cache(); + index_only = 0; + } else + index_only = 1; + + clean = merge_trees(h1->tree, h2->tree, merged_common_ancestors->tree, + branch1, branch2, &mrtree); + + if (index_only) { + *result = make_virtual_commit(mrtree, "merged tree"); + commit_list_insert(h1, &(*result)->parents); + commit_list_insert(h2, &(*result)->parents->next); + } + flush_output(); + return clean; + } + + static const char *better_branch_name(const char *branch) + { + static char githead_env[8 + 40 + 1]; + char *name; + + if (strlen(branch) != 40) + return branch; + sprintf(githead_env, "GITHEAD_%s", branch); + name = getenv(githead_env); + return name ? name : branch; + } + + static struct commit *get_ref(const char *ref) + { + unsigned char sha1[20]; + struct object *object; + + if (get_sha1(ref, sha1)) + die("Could not resolve ref '%s'", ref); + object = deref_tag(parse_object(sha1), ref, strlen(ref)); ++ if (!object) ++ return NULL; + if (object->type == OBJ_TREE) + return make_virtual_commit((struct tree*)object, + better_branch_name(ref)); + if (object->type != OBJ_COMMIT) + return NULL; + if (parse_commit((struct commit *)object)) + die("Could not parse commit '%s'", sha1_to_hex(object->sha1)); + return (struct commit *)object; + } + + static int merge_config(const char *var, const char *value) + { + if (!strcasecmp(var, "merge.verbosity")) { + verbosity = git_config_int(var, value); + return 0; + } + if (!strcasecmp(var, "diff.renamelimit")) { + rename_limit = git_config_int(var, value); + return 0; + } + return git_default_config(var, value); + } + + int cmd_merge_recursive(int argc, const char **argv, const char *prefix) + { + static const char *bases[20]; + static unsigned bases_count = 0; + int i, clean; + const char *branch1, *branch2; + struct commit *result, *h1, *h2; + struct commit_list *ca = NULL; + struct lock_file *lock = xcalloc(1, sizeof(struct lock_file)); + int index_fd; + + if (argv[0]) { + int namelen = strlen(argv[0]); + if (8 < namelen && + !strcmp(argv[0] + namelen - 8, "-subtree")) + subtree_merge = 1; + } + + git_config(merge_config); + if (getenv("GIT_MERGE_VERBOSITY")) + verbosity = strtol(getenv("GIT_MERGE_VERBOSITY"), NULL, 10); + + if (argc < 4) + die("Usage: %s ... -- ...\n", argv[0]); + + for (i = 1; i < argc; ++i) { + if (!strcmp(argv[i], "--")) + break; + if (bases_count < sizeof(bases)/sizeof(*bases)) + bases[bases_count++] = argv[i]; + } + if (argc - i != 3) /* "--" "" "" */ + die("Not handling anything other than two heads merge."); + if (verbosity >= 5) + buffer_output = 0; + + branch1 = argv[++i]; + branch2 = argv[++i]; + + h1 = get_ref(branch1); + h2 = get_ref(branch2); + + branch1 = better_branch_name(branch1); + branch2 = better_branch_name(branch2); + + if (show(3)) + printf("Merging %s with %s\n", branch1, branch2); + + index_fd = hold_locked_index(lock, 1); + + for (i = 0; i < bases_count; i++) { + struct commit *ancestor = get_ref(bases[i]); + ca = commit_list_insert(ancestor, &ca); + } + clean = merge_recursive(h1, h2, branch1, branch2, ca, &result); + + if (active_cache_changed && + (write_cache(index_fd, active_cache, active_nr) || + commit_locked_index(lock))) + die ("unable to write %s", get_index_file()); + + return clean ? 0: 1; + } diff --cc contrib/examples/git-checkout.sh index 000000000,5621c69d8..1a7689a48 mode 000000,100755..100755 --- a/contrib/examples/git-checkout.sh +++ b/contrib/examples/git-checkout.sh @@@ -1,0 -1,298 +1,302 @@@ + #!/bin/sh + + OPTIONS_KEEPDASHDASH=t + OPTIONS_SPEC="\ + git-checkout [options] [] [...] + -- + b= create a new branch started at + l create the new branch's reflog + track arrange that the new branch tracks the remote branch + f proceed even if the index or working tree is not HEAD + m merge local modifications into the new branch + q,quiet be quiet + " + SUBDIRECTORY_OK=Sometimes + . git-sh-setup + require_work_tree + + old_name=HEAD + old=$(git rev-parse --verify $old_name 2>/dev/null) + oldbranch=$(git symbolic-ref $old_name 2>/dev/null) + new= + new_name= + force= + branch= + track= + newbranch= + newbranch_log= + merge= + quiet= + v=-v + LF=' + ' + + while test $# != 0; do + case "$1" in + -b) + shift + newbranch="$1" + [ -z "$newbranch" ] && + die "git checkout: -b needs a branch name" + git show-ref --verify --quiet -- "refs/heads/$newbranch" && + die "git checkout: branch $newbranch already exists" + git check-ref-format "heads/$newbranch" || + die "git checkout: we do not like '$newbranch' as a branch name." + ;; + -l) + newbranch_log=-l + ;; + --track|--no-track) + track="$1" + ;; + -f) + force=1 + ;; + -m) + merge=1 + ;; + -q|--quiet) + quiet=1 + v= + ;; + --) + shift + break + ;; + *) + usage + ;; + esac + shift + done + + arg="$1" -if rev=$(git rev-parse --verify "$arg^0" 2>/dev/null) ++rev=$(git rev-parse --verify "$arg" 2>/dev/null) ++if rev=$(git rev-parse --verify "$rev^0" 2>/dev/null) + then + [ -z "$rev" ] && die "unknown flag $arg" + new_name="$arg" + if git show-ref --verify --quiet -- "refs/heads/$arg" + then + rev=$(git rev-parse --verify "refs/heads/$arg^0") + branch="$arg" + fi + new="$rev" + shift -elif rev=$(git rev-parse --verify "$arg^{tree}" 2>/dev/null) ++elif rev=$(git rev-parse --verify "$rev^{tree}" 2>/dev/null) + then + # checking out selected paths from a tree-ish. + new="$rev" - new_name="$arg^{tree}" ++ new_name="$rev^{tree}" + shift + fi + [ "$1" = "--" ] && shift + + case "$newbranch,$track" in + ,--*) + die "git checkout: --track and --no-track require -b" + esac + + case "$force$merge" in + 11) + die "git checkout: -f and -m are incompatible" + esac + + # The behaviour of the command with and without explicit path + # parameters is quite different. + # + # Without paths, we are checking out everything in the work tree, + # possibly switching branches. This is the traditional behaviour. + # + # With paths, we are _never_ switching branch, but checking out + # the named paths from either index (when no rev is given), + # or the named tree-ish (when rev is given). + + if test "$#" -ge 1 + then + hint= + if test "$#" -eq 1 + then + hint=" + Did you intend to checkout '$@' which can not be resolved as commit?" + fi + if test '' != "$newbranch$force$merge" + then + die "git checkout: updating paths is incompatible with switching branches/forcing$hint" + fi + if test '' != "$new" + then + # from a specific tree-ish; note that this is for + # rescuing paths and is never meant to remove what + # is not in the named tree-ish. + git ls-tree --full-name -r "$new" "$@" | + git update-index --index-info || exit $? + fi + + # Make sure the request is about existing paths. + git ls-files --full-name --error-unmatch -- "$@" >/dev/null || exit + git ls-files --full-name -- "$@" | + (cd_to_toplevel && git checkout-index -f -u --stdin) + + # Run a post-checkout hook -- the HEAD does not change so the + # current HEAD is passed in for both args + if test -x "$GIT_DIR"/hooks/post-checkout; then + "$GIT_DIR"/hooks/post-checkout $old $old 0 + fi + + exit $? + else + # Make sure we did not fall back on $arg^{tree} codepath + # since we are not checking out from an arbitrary tree-ish, + # but switching branches. + if test '' != "$new" + then + git rev-parse --verify "$new^{commit}" >/dev/null 2>&1 || + die "Cannot switch branch to a non-commit." + fi + fi + + # We are switching branches and checking out trees, so + # we *NEED* to be at the toplevel. + cd_to_toplevel + + [ -z "$new" ] && new=$old && new_name="$old_name" + + # If we don't have an existing branch that we're switching to, + # and we don't have a new branch name for the target we + # are switching to, then we are detaching our HEAD from any + # branch. However, if "git checkout HEAD" detaches the HEAD + # from the current branch, even though that may be logically + # correct, it feels somewhat funny. More importantly, we do not + # want "git checkout" nor "git checkout -f" to detach HEAD. + + detached= + detach_warn= + + describe_detached_head () { + test -n "$quiet" || { + printf >&2 "$1 " + GIT_PAGER= git log >&2 -1 --pretty=oneline --abbrev-commit "$2" -- + } + } + + if test -z "$branch$newbranch" && test "$new_name" != "$old_name" + then + detached="$new" + if test -n "$oldbranch" && test -z "$quiet" + then + detach_warn="Note: moving to \"$new_name\" which isn't a local branch + If you want to create a new branch from this checkout, you may do so + (now or later) by using -b with the checkout command again. Example: + git checkout -b " + fi + elif test -z "$oldbranch" && test "$new" != "$old" + then + describe_detached_head 'Previous HEAD position was' "$old" + fi + + if [ "X$old" = X ] + then + if test -z "$quiet" + then + echo >&2 "warning: You appear to be on a branch yet to be born." + echo >&2 "warning: Forcing checkout of $new_name." + fi + force=1 + fi + + if [ "$force" ] + then + git read-tree $v --reset -u $new + else + git update-index --refresh >/dev/null - merge_error=$(git read-tree -m -u --exclude-per-directory=.gitignore $old $new 2>&1) || ( - case "$merge" in - '') - echo >&2 "$merge_error" ++ git read-tree $v -m -u --exclude-per-directory=.gitignore $old $new || ( ++ case "$merge,$v" in ++ ,*) + exit 1 ;; ++ 1,) ++ ;; # quiet ++ *) ++ echo >&2 "Falling back to 3-way merge..." ;; + esac + + # Match the index to the working tree, and do a three-way. + git diff-files --name-only | git update-index --remove --stdin && + work=`git write-tree` && + git read-tree $v --reset -u $new || exit + + eval GITHEAD_$new='${new_name:-${branch:-$new}}' && + eval GITHEAD_$work=local && + export GITHEAD_$new GITHEAD_$work && + git merge-recursive $old -- $new $work + + # Do not register the cleanly merged paths in the index yet. + # this is not a real merge before committing, but just carrying + # the working tree changes along. + unmerged=`git ls-files -u` + git read-tree $v --reset $new + case "$unmerged" in + '') ;; + *) + ( + z40=0000000000000000000000000000000000000000 + echo "$unmerged" | + sed -e 's/^[0-7]* [0-9a-f]* /'"0 $z40 /" + echo "$unmerged" + ) | git update-index --index-info + ;; + esac + exit 0 + ) + saved_err=$? + if test "$saved_err" = 0 && test -z "$quiet" + then + git diff-index --name-status "$new" + fi + (exit $saved_err) + fi + + # + # Switch the HEAD pointer to the new branch if we + # checked out a branch head, and remove any potential + # old MERGE_HEAD's (subsequent commits will clearly not + # be based on them, since we re-set the index) + # + if [ "$?" -eq 0 ]; then + if [ "$newbranch" ]; then + git branch $track $newbranch_log "$newbranch" "$new_name" || exit + branch="$newbranch" + fi + if test -n "$branch" + then + old_branch_name=`expr "z$oldbranch" : 'zrefs/heads/\(.*\)'` + GIT_DIR="$GIT_DIR" git symbolic-ref -m "checkout: moving from ${old_branch_name:-$old} to $branch" HEAD "refs/heads/$branch" + if test -n "$quiet" + then + true # nothing + elif test "refs/heads/$branch" = "$oldbranch" + then + echo >&2 "Already on branch \"$branch\"" + else + echo >&2 "Switched to${newbranch:+ a new} branch \"$branch\"" + fi + elif test -n "$detached" + then + old_branch_name=`expr "z$oldbranch" : 'zrefs/heads/\(.*\)'` + git update-ref --no-deref -m "checkout: moving from ${old_branch_name:-$old} to $arg" HEAD "$detached" || + die "Cannot detach HEAD" + if test -n "$detach_warn" + then + echo >&2 "$detach_warn" + fi + describe_detached_head 'HEAD is now at' HEAD + fi + rm -f "$GIT_DIR/MERGE_HEAD" + else + exit 1 + fi + + # Run a post-checkout hook + if test -x "$GIT_DIR"/hooks/post-checkout; then + "$GIT_DIR"/hooks/post-checkout $old $new 1 + fi diff --cc unpack-trees.c index 56c1ffbc1,470fa02e0..3e448d897 --- a/unpack-trees.c +++ b/unpack-trees.c @@@ -590,9 -624,10 +625,10 @@@ static int merged_entry(struct cache_en * a match. */ if (same(old, merge)) { - memcpy(merge, old, offsetof(struct cache_entry, name)); + copy_cache_entry(merge, old); } else { - verify_uptodate(old, o); + if (verify_uptodate(old, o)) + return -1; invalidate_ce_path(old); } }