#include "advice.h"
#include "lockfile.h"
#include "cache-tree.h"
+#include "object-store.h"
#include "commit.h"
#include "blob.h"
#include "builtin.h"
#include "diff.h"
#include "diffcore.h"
#include "tag.h"
+#include "alloc.h"
#include "unpack-trees.h"
#include "string-list.h"
#include "xdiff-interface.h"
#include "merge-recursive.h"
#include "dir.h"
#include "submodule.h"
+#include "revision.h"
struct path_hashmap_entry {
struct hashmap_entry e;
static struct commit *make_virtual_commit(struct tree *tree, const char *comment)
{
- struct commit *commit = alloc_commit_node();
+ struct commit *commit = alloc_commit_node(the_repository);
set_merge_remote_desc(commit, comment, (struct object *)commit);
- commit->tree = tree;
+ commit->maybe_tree = tree;
commit->object.parsed = 1;
return commit;
}
enum rename_type {
RENAME_NORMAL = 0,
- RENAME_DIR,
+ RENAME_VIA_DIR,
RENAME_DELETE,
RENAME_ONE_FILE_TO_ONE,
RENAME_ONE_FILE_TO_TWO,
static void output_commit_title(struct merge_options *o, struct commit *commit)
{
+ struct merge_remote_desc *desc;
+
strbuf_addchars(&o->obuf, ' ', o->call_depth * 2);
- if (commit->util)
- strbuf_addf(&o->obuf, "virtual %s\n",
- merge_remote_util(commit)->name);
+ desc = merge_remote_util(commit);
+ if (desc)
+ strbuf_addf(&o->obuf, "virtual %s\n", desc->name);
else {
strbuf_add_unique_abbrev(&o->obuf, &commit->object.oid,
DEFAULT_ABBREV);
}
static int add_cacheinfo(struct merge_options *o,
- unsigned int mode, const struct object_id *oid,
- const char *path, int stage, int refresh, int options)
+ unsigned int mode, const struct object_id *oid,
+ const char *path, int stage, int refresh, int options)
{
struct cache_entry *ce;
int ret;
init_tree_desc(desc, tree->buffer, tree->size);
}
-static int git_merge_trees(struct merge_options *o,
- struct tree *common,
- struct tree *head,
- struct tree *merge)
+static int unpack_trees_start(struct merge_options *o,
+ struct tree *common,
+ struct tree *head,
+ struct tree *merge)
{
int rc;
struct tree_desc t[3];
o->unpack_opts.fn = threeway_merge;
o->unpack_opts.src_index = &the_index;
o->unpack_opts.dst_index = &tmp_index;
+ o->unpack_opts.aggressive = !merge_detect_rename(o);
setup_unpack_trees_porcelain(&o->unpack_opts, "merge");
init_tree_desc_from_tree(t+0, common);
return rc;
}
+static void unpack_trees_finish(struct merge_options *o)
+{
+ discard_index(&o->orig_index);
+ clear_unpack_trees_porcelain(&o->unpack_opts);
+}
+
struct tree *write_tree_from_memory(struct merge_options *o)
{
struct tree *result = NULL;
fprintf(stderr, "BUG: %d %.*s\n", ce_stage(ce),
(int)ce_namelen(ce), ce->name);
}
- die("BUG: unmerged index entries in merge-recursive.c");
+ BUG("unmerged index entries in merge-recursive.c");
}
if (!active_cache_tree)
}
static int save_files_dirs(const struct object_id *oid,
- struct strbuf *base, const char *path,
- unsigned int mode, int stage, void *context)
+ struct strbuf *base, const char *path,
+ unsigned int mode, int stage, void *context)
{
struct path_hashmap_entry *entry;
int baselen = base->len;
struct string_list *entries)
{
/* If there is a D/F conflict and the file for such a conflict
- * currently exist in the working tree, we want to allow it to be
+ * currently exists in the working tree, we want to allow it to be
* removed to make room for the corresponding directory if needed.
* The files underneath the directories of such D/F conflicts will
* be processed before the corresponding file involved in the D/F
*/
if (would_lose_untracked(path))
return err(o, _("refusing to lose untracked file at '%s'"),
- path);
+ path);
/* Successful unlink is good.. */
if (!unlink(path))
unlink(path);
if (symlink(lnk, path))
ret = err(o, _("failed to symlink '%s': %s"),
- path, strerror(errno));
+ path, strerror(errno));
free(lnk);
} else
ret = err(o,
_("do not know what to do with %06o %s '%s'"),
mode, oid_to_hex(oid), path);
- free_buf:
+ free_buf:
free(buf);
}
- update_index:
+update_index:
if (!ret && update_cache)
if (add_cacheinfo(o, mode, oid, path, 0, update_wd,
ADD_CACHE_OK_TO_ADD))
return merge_status;
}
+static int find_first_merges(struct object_array *result, const char *path,
+ struct commit *a, struct commit *b)
+{
+ int i, j;
+ struct object_array merges = OBJECT_ARRAY_INIT;
+ struct commit *commit;
+ int contains_another;
+
+ char merged_revision[42];
+ const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
+ "--all", merged_revision, NULL };
+ struct rev_info revs;
+ struct setup_revision_opt rev_opts;
+
+ memset(result, 0, sizeof(struct object_array));
+ memset(&rev_opts, 0, sizeof(rev_opts));
+
+ /* get all revisions that merge commit a */
+ xsnprintf(merged_revision, sizeof(merged_revision), "^%s",
+ oid_to_hex(&a->object.oid));
+ init_revisions(&revs, NULL);
+ rev_opts.submodule = path;
+ /* FIXME: can't handle linked worktrees in submodules yet */
+ revs.single_worktree = path != NULL;
+ setup_revisions(ARRAY_SIZE(rev_args)-1, rev_args, &revs, &rev_opts);
+
+ /* save all revisions from the above list that contain b */
+ if (prepare_revision_walk(&revs))
+ die("revision walk setup failed");
+ while ((commit = get_revision(&revs)) != NULL) {
+ struct object *o = &(commit->object);
+ if (in_merge_bases(b, commit))
+ add_object_array(o, NULL, &merges);
+ }
+ reset_revision_walk();
+
+ /* Now we've got all merges that contain a and b. Prune all
+ * merges that contain another found merge and save them in
+ * result.
+ */
+ for (i = 0; i < merges.nr; i++) {
+ struct commit *m1 = (struct commit *) merges.objects[i].item;
+
+ contains_another = 0;
+ for (j = 0; j < merges.nr; j++) {
+ struct commit *m2 = (struct commit *) merges.objects[j].item;
+ if (i != j && in_merge_bases(m2, m1)) {
+ contains_another = 1;
+ break;
+ }
+ }
+
+ if (!contains_another)
+ add_object_array(merges.objects[i].item, NULL, result);
+ }
+
+ object_array_clear(&merges);
+ return result->nr;
+}
+
+static void print_commit(struct commit *commit)
+{
+ struct strbuf sb = STRBUF_INIT;
+ struct pretty_print_context ctx = {0};
+ ctx.date_mode.type = DATE_NORMAL;
+ format_commit_message(commit, " %h: %m %s", &sb, &ctx);
+ fprintf(stderr, "%s\n", sb.buf);
+ strbuf_release(&sb);
+}
+
+static int merge_submodule(struct merge_options *o,
+ struct object_id *result, const char *path,
+ const struct object_id *base, const struct object_id *a,
+ const struct object_id *b)
+{
+ struct commit *commit_base, *commit_a, *commit_b;
+ int parent_count;
+ struct object_array merges;
+
+ int i;
+ int search = !o->call_depth;
+
+ /* store a in result in case we fail */
+ oidcpy(result, a);
+
+ /* we can not handle deletion conflicts */
+ if (is_null_oid(base))
+ return 0;
+ if (is_null_oid(a))
+ return 0;
+ if (is_null_oid(b))
+ return 0;
+
+ if (add_submodule_odb(path)) {
+ output(o, 1, _("Failed to merge submodule %s (not checked out)"), path);
+ return 0;
+ }
+
+ if (!(commit_base = lookup_commit_reference(base)) ||
+ !(commit_a = lookup_commit_reference(a)) ||
+ !(commit_b = lookup_commit_reference(b))) {
+ output(o, 1, _("Failed to merge submodule %s (commits not present)"), path);
+ return 0;
+ }
+
+ /* check whether both changes are forward */
+ if (!in_merge_bases(commit_base, commit_a) ||
+ !in_merge_bases(commit_base, commit_b)) {
+ output(o, 1, _("Failed to merge submodule %s (commits don't follow merge-base)"), path);
+ return 0;
+ }
+
+ /* Case #1: a is contained in b or vice versa */
+ if (in_merge_bases(commit_a, commit_b)) {
+ oidcpy(result, b);
+ if (show(o, 3)) {
+ output(o, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
+ output_commit_title(o, commit_b);
+ } else if (show(o, 2))
+ output(o, 2, _("Fast-forwarding submodule %s"), path);
+ else
+ ; /* no output */
+
+ return 1;
+ }
+ if (in_merge_bases(commit_b, commit_a)) {
+ oidcpy(result, a);
+ if (show(o, 3)) {
+ output(o, 3, _("Fast-forwarding submodule %s to the following commit:"), path);
+ output_commit_title(o, commit_a);
+ } else if (show(o, 2))
+ output(o, 2, _("Fast-forwarding submodule %s"), path);
+ else
+ ; /* no output */
+
+ return 1;
+ }
+
+ /*
+ * Case #2: There are one or more merges that contain a and b in
+ * the submodule. If there is only one, then present it as a
+ * suggestion to the user, but leave it marked unmerged so the
+ * user needs to confirm the resolution.
+ */
+
+ /* Skip the search if makes no sense to the calling context. */
+ if (!search)
+ return 0;
+
+ /* find commit which merges them */
+ parent_count = find_first_merges(&merges, path, commit_a, commit_b);
+ switch (parent_count) {
+ case 0:
+ output(o, 1, _("Failed to merge submodule %s (merge following commits not found)"), path);
+ break;
+
+ case 1:
+ output(o, 1, _("Failed to merge submodule %s (not fast-forward)"), path);
+ output(o, 2, _("Found a possible merge resolution for the submodule:\n"));
+ print_commit((struct commit *) merges.objects[0].item);
+ output(o, 2, _(
+ "If this is correct simply add it to the index "
+ "for example\n"
+ "by using:\n\n"
+ " git update-index --cacheinfo 160000 %s \"%s\"\n\n"
+ "which will accept this suggestion.\n"),
+ oid_to_hex(&merges.objects[0].item->oid), path);
+ break;
+
+ default:
+ output(o, 1, _("Failed to merge submodule %s (multiple merges found)"), path);
+ for (i = 0; i < merges.nr; i++)
+ print_commit((struct commit *) merges.objects[i].item);
+ }
+
+ object_array_clear(&merges);
+ return 0;
+}
+
static int merge_file_1(struct merge_options *o,
const struct diff_filespec *one,
const struct diff_filespec *a,
return ret;
result->clean = (merge_status == 0);
} else if (S_ISGITLINK(a->mode)) {
- result->clean = merge_submodule(&result->oid,
- one->path,
- &one->oid,
- &a->oid,
- &b->oid,
- !o->call_depth);
+ result->clean = merge_submodule(o, &result->oid,
+ one->path,
+ &one->oid,
+ &a->oid,
+ &b->oid);
} else if (S_ISLNK(a->mode)) {
switch (o->recursive_variant) {
case MERGE_RECURSIVE_NORMAL:
break;
}
} else
- die("BUG: unsupported object type in the tree");
+ BUG("unsupported object type in the tree");
}
if (result->merge)
return merge_file_1(o, &one, &a, &b, path, branch1, branch2, mfi);
}
-static int conflict_rename_dir(struct merge_options *o,
- struct diff_filepair *pair,
- const char *rename_branch,
- const char *other_branch)
+static int handle_rename_via_dir(struct merge_options *o,
+ struct diff_filepair *pair,
+ const char *rename_branch,
+ const char *other_branch)
{
+ /*
+ * Handle file adds that need to be renamed due to directory rename
+ * detection. This differs from handle_rename_normal, because
+ * there is no content merge to do; just move the file into the
+ * desired final location.
+ */
const struct diff_filespec *dest = pair->two;
if (!o->call_depth && would_lose_untracked(dest->path)) {
}
static int handle_change_delete(struct merge_options *o,
- const char *path, const char *old_path,
- const struct object_id *o_oid, int o_mode,
- const struct object_id *changed_oid,
- int changed_mode,
- const char *change_branch,
- const char *delete_branch,
- const char *change, const char *change_past)
+ const char *path, const char *old_path,
+ const struct object_id *o_oid, int o_mode,
+ const struct object_id *changed_oid,
+ int changed_mode,
+ const char *change_branch,
+ const char *delete_branch,
+ const char *change, const char *change_past)
{
char *alt_path = NULL;
const char *update_path = path;
if (!ret)
ret = update_file(o, 0, o_oid, o_mode, update_path);
} else {
+ /*
+ * Despite the four nearly duplicate messages and argument
+ * lists below and the ugliness of the nested if-statements,
+ * having complete messages makes the job easier for
+ * translators.
+ *
+ * The slight variance among the cases is due to the fact
+ * that:
+ * 1) directory/file conflicts (in effect if
+ * !alt_path) could cause us to need to write the
+ * file to a different path.
+ * 2) renames (in effect if !old_path) could mean that
+ * there are two names for the path that the user
+ * may know the file by.
+ */
if (!alt_path) {
if (!old_path) {
output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
return ret;
}
-static int conflict_rename_delete(struct merge_options *o,
- struct diff_filepair *pair,
- const char *rename_branch,
- const char *delete_branch)
+static int handle_rename_delete(struct merge_options *o,
+ struct diff_filepair *pair,
+ const char *rename_branch,
+ const char *delete_branch)
{
const struct diff_filespec *orig = pair->one;
const struct diff_filespec *dest = pair->two;
return ret;
}
-static int conflict_rename_rename_1to2(struct merge_options *o,
- struct rename_conflict_info *ci)
+static int handle_rename_rename_1to2(struct merge_options *o,
+ struct rename_conflict_info *ci)
{
/* One file was renamed in both branches, but to different names. */
struct diff_filespec *one = ci->pair1->one;
return 0;
}
-static int conflict_rename_rename_2to1(struct merge_options *o,
- struct rename_conflict_info *ci)
+static int handle_rename_rename_2to1(struct merge_options *o,
+ struct rename_conflict_info *ci)
{
/* Two files, a & b, were renamed to the same thing, c. */
struct diff_filespec *a = ci->pair1->one;
diff_setup(&opts);
opts.flags.recursive = 1;
opts.flags.rename_empty = 0;
- opts.detect_rename = DIFF_DETECT_RENAME;
+ opts.detect_rename = merge_detect_rename(o);
+ /*
+ * We do not have logic to handle the detection of copies. In
+ * fact, it may not even make sense to add such logic: would we
+ * really want a change to a base file to be propagated through
+ * multiple other files by a merge?
+ */
+ if (opts.detect_rename > DIFF_DETECT_RENAME)
+ opts.detect_rename = DIFF_DETECT_RENAME;
opts.rename_limit = o->merge_rename_limit >= 0 ? o->merge_rename_limit :
o->diff_rename_limit >= 0 ? o->diff_rename_limit :
1000;
* "NOTE" in update_stages(), doing so will modify the current
* in-memory index which will break calls to would_lose_untracked()
* that we need to make. Instead, we need to just make sure that
- * the various conflict_rename_*() functions update the index
+ * the various handle_rename_*() functions update the index
* explicitly rather than relying on unpack_trees() to have done it.
*/
get_tree_entry(&tree->object.oid,
const char *ren2_dst = ren2->pair->two->path;
enum rename_type rename_type;
if (strcmp(ren1_src, ren2_src) != 0)
- die("BUG: ren1_src != ren2_src");
+ BUG("ren1_src != ren2_src");
ren2->dst_entry->processed = 1;
ren2->processed = 1;
if (strcmp(ren1_dst, ren2_dst) != 0) {
ren2 = lookup->util;
ren2_dst = ren2->pair->two->path;
if (strcmp(ren1_dst, ren2_dst) != 0)
- die("BUG: ren1_dst != ren2_dst");
+ BUG("ren1_dst != ren2_dst");
clean_merge = 0;
ren2->processed = 1;
if (oid_eq(&src_other.oid, &null_oid) &&
ren1->add_turned_into_rename) {
- setup_rename_conflict_info(RENAME_DIR,
+ setup_rename_conflict_info(RENAME_VIA_DIR,
ren1->pair,
NULL,
branch1,
free(pairs);
}
-static int handle_renames(struct merge_options *o,
- struct tree *common,
- struct tree *head,
- struct tree *merge,
- struct string_list *entries,
- struct rename_info *ri)
+static int detect_and_process_renames(struct merge_options *o,
+ struct tree *common,
+ struct tree *head,
+ struct tree *merge,
+ struct string_list *entries,
+ struct rename_info *ri)
{
struct diff_queue_struct *head_pairs, *merge_pairs;
struct hashmap *dir_re_head, *dir_re_merge;
ri->head_renames = NULL;
ri->merge_renames = NULL;
- if (!o->detect_rename)
+ if (!merge_detect_rename(o))
return 1;
head_pairs = get_diffpairs(o, common, head);
}
static int read_oid_strbuf(struct merge_options *o,
- const struct object_id *oid, struct strbuf *dst)
+ const struct object_id *oid,
+ struct strbuf *dst)
{
void *buf;
enum object_type type;
}
static int handle_modify_delete(struct merge_options *o,
- const char *path,
- struct object_id *o_oid, int o_mode,
- struct object_id *a_oid, int a_mode,
- struct object_id *b_oid, int b_mode)
+ const char *path,
+ struct object_id *o_oid, int o_mode,
+ struct object_id *a_oid, int a_mode,
+ struct object_id *b_oid, int b_mode)
{
const char *modify_branch, *delete_branch;
struct object_id *changed_oid;
return !is_dirty && mfi.clean;
}
-static int conflict_rename_normal(struct merge_options *o,
- const char *path,
- struct object_id *o_oid, unsigned int o_mode,
- struct object_id *a_oid, unsigned int a_mode,
- struct object_id *b_oid, unsigned int b_mode,
- struct rename_conflict_info *ci)
+static int handle_rename_normal(struct merge_options *o,
+ const char *path,
+ struct object_id *o_oid, unsigned int o_mode,
+ struct object_id *a_oid, unsigned int a_mode,
+ struct object_id *b_oid, unsigned int b_mode,
+ struct rename_conflict_info *ci)
{
/* Merge the content and write it out */
return merge_content(o, path, was_dirty(o, path),
switch (conflict_info->rename_type) {
case RENAME_NORMAL:
case RENAME_ONE_FILE_TO_ONE:
- clean_merge = conflict_rename_normal(o,
- path,
- o_oid, o_mode,
- a_oid, a_mode,
- b_oid, b_mode,
- conflict_info);
+ clean_merge = handle_rename_normal(o,
+ path,
+ o_oid, o_mode,
+ a_oid, a_mode,
+ b_oid, b_mode,
+ conflict_info);
break;
- case RENAME_DIR:
+ case RENAME_VIA_DIR:
clean_merge = 1;
- if (conflict_rename_dir(o,
- conflict_info->pair1,
- conflict_info->branch1,
- conflict_info->branch2))
+ if (handle_rename_via_dir(o,
+ conflict_info->pair1,
+ conflict_info->branch1,
+ conflict_info->branch2))
clean_merge = -1;
break;
case RENAME_DELETE:
clean_merge = 0;
- if (conflict_rename_delete(o,
- conflict_info->pair1,
- conflict_info->branch1,
- conflict_info->branch2))
+ if (handle_rename_delete(o,
+ conflict_info->pair1,
+ conflict_info->branch1,
+ conflict_info->branch2))
clean_merge = -1;
break;
case RENAME_ONE_FILE_TO_TWO:
clean_merge = 0;
- if (conflict_rename_rename_1to2(o, conflict_info))
+ if (handle_rename_rename_1to2(o, conflict_info))
clean_merge = -1;
break;
case RENAME_TWO_FILES_TO_ONE:
clean_merge = 0;
- if (conflict_rename_rename_2to1(o, conflict_info))
+ if (handle_rename_rename_2to1(o, conflict_info))
clean_merge = -1;
break;
default:
*/
remove_file(o, 1, path, !a_mode);
} else
- die("BUG: fatal merge failure, shouldn't happen.");
+ BUG("fatal merge failure, shouldn't happen.");
return clean_merge;
}
return 1;
}
- code = git_merge_trees(o, common, head, merge);
+ code = unpack_trees_start(o, common, head, merge);
if (code != 0) {
if (show(o, 4) || o->call_depth)
err(o, _("merging of trees %s and %s failed"),
oid_to_hex(&head->object.oid),
oid_to_hex(&merge->object.oid));
+ unpack_trees_finish(o);
return -1;
}
get_files_dirs(o, merge);
entries = get_unmerged();
- clean = handle_renames(o, common, head, merge, entries,
- &re_info);
+ clean = detect_and_process_renames(o, common, head, merge,
+ entries, &re_info);
record_df_conflict_files(o, entries);
if (clean < 0)
goto cleanup;
for (i = 0; i < entries->nr; i++) {
struct stage_data *e = entries->items[i].util;
if (!e->processed)
- die("BUG: unprocessed path??? %s",
+ BUG("unprocessed path??? %s",
entries->items[i].string);
}
-cleanup:
+ cleanup:
final_cleanup_renames(&re_info);
string_list_clear(entries, 1);
hashmap_free(&o->current_file_dir_set, 1);
- if (clean < 0)
+ if (clean < 0) {
+ unpack_trees_finish(o);
return clean;
+ }
}
else
clean = 1;
- /* Free the extra index left from git_merge_trees() */
- /*
- * FIXME: Need to also free data allocated by
- * setup_unpack_trees_porcelain() tucked away in o->unpack_opts.msgs,
- * but the problem is that only half of it refers to dynamically
- * allocated data, while the other half points at static strings.
- */
- discard_index(&o->orig_index);
+ unpack_trees_finish(o);
if (o->call_depth && !(*result = write_tree_from_memory(o)))
return -1;
read_cache();
o->ancestor = "merged common ancestors";
- clean = merge_trees(o, h1->tree, h2->tree, merged_common_ancestors->tree,
+ clean = merge_trees(o, get_commit_tree(h1), get_commit_tree(h2),
+ get_commit_tree(merged_common_ancestors),
&mrtree);
if (clean < 0) {
flush_output(o);
struct commit *base;
if (!(base = get_ref(base_list[i], oid_to_hex(base_list[i]))))
return err(o, _("Could not parse object '%s'"),
- oid_to_hex(base_list[i]));
+ oid_to_hex(base_list[i]));
commit_list_insert(base, &ca);
}
}
hold_locked_index(&lock, LOCK_DIE_ON_ERROR);
clean = merge_recursive(o, head_commit, next_commit, ca,
- result);
+ result);
if (clean < 0) {
rollback_lock_file(&lock);
return clean;
static void merge_recursive_config(struct merge_options *o)
{
+ char *value = NULL;
git_config_get_int("merge.verbosity", &o->verbosity);
git_config_get_int("diff.renamelimit", &o->diff_rename_limit);
git_config_get_int("merge.renamelimit", &o->merge_rename_limit);
+ if (!git_config_get_string("diff.renames", &value)) {
+ o->diff_detect_rename = git_config_rename("diff.renames", value);
+ free(value);
+ }
+ if (!git_config_get_string("merge.renames", &value)) {
+ o->merge_detect_rename = git_config_rename("merge.renames", value);
+ free(value);
+ }
git_config(git_xmerge_config, NULL);
}
o->diff_rename_limit = -1;
o->merge_rename_limit = -1;
o->renormalize = 0;
- o->detect_rename = 1;
+ o->diff_detect_rename = -1;
+ o->merge_detect_rename = -1;
merge_recursive_config(o);
merge_verbosity = getenv("GIT_MERGE_VERBOSITY");
if (merge_verbosity)
else if (!strcmp(s, "no-renormalize"))
o->renormalize = 0;
else if (!strcmp(s, "no-renames"))
- o->detect_rename = 0;
+ o->merge_detect_rename = 0;
else if (!strcmp(s, "find-renames")) {
- o->detect_rename = 1;
+ o->merge_detect_rename = 1;
o->rename_score = 0;
}
else if (skip_prefix(s, "find-renames=", &arg) ||
skip_prefix(s, "rename-threshold=", &arg)) {
if ((o->rename_score = parse_rename_score(&arg)) == -1 || *arg != 0)
return -1;
- o->detect_rename = 1;
+ o->merge_detect_rename = 1;
}
else
return -1;