continued merge
This commit is contained in:
parent
a336b507fb
commit
1d119cb63e
@ -340,7 +340,8 @@ on_error:
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//
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// git merge
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//
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struct merge_options { const char **heads;
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struct merge_options {
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const char **heads;
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size_t heads_count;
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git_annotated_commit **annotated;
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@ -376,6 +377,208 @@ static void parse_options(const char **repo_path, struct merge_options *opts) {
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#endif
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}
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static void opts_add_refish(struct merge_options *opts, const char *refish) {
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size_t sz;
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assert(opts != NULL);
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sz = ++opts->heads_count * sizeof(opts->heads[0]);
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opts->heads = xrealloc((void *) opts->heads, sz);
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opts->heads[opts->heads_count - 1] = refish;
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}
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static int resolve_heads(git_repository *repo, struct merge_options *opts)
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{
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git_annotated_commit **annotated = calloc(opts->heads_count, sizeof(git_annotated_commit *));
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size_t annotated_count = 0, i;
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int err = 0;
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for (i = 0; i < opts->heads_count; i++) {
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err = resolve_refish(&annotated[annotated_count++], repo, opts->heads[i]);
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if (err != 0) {
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fprintf(stderr, "failed to resolve refish %s: %s\n", opts->heads[i], git_error_last()->message);
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annotated_count--;
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continue;
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}
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}
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if (annotated_count != opts->heads_count) {
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fprintf(stderr, "unable to parse some refish\n");
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free(annotated);
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return -1;
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}
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opts->annotated = annotated;
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opts->annotated_count = annotated_count;
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return 0;
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}
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static int perform_fastforward(git_repository *repo, const git_oid *target_oid, int is_unborn)
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{
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git_checkout_options ff_checkout_options = GIT_CHECKOUT_OPTIONS_INIT;
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git_reference *target_ref;
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git_reference *new_target_ref;
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git_object *target = NULL;
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int err = 0;
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if (is_unborn) {
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const char *symbolic_ref;
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git_reference *head_ref;
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/* HEAD reference is unborn, lookup manually so we don't try to resolve it */
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err = git_reference_lookup(&head_ref, repo, "HEAD");
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if (err != 0) {
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fprintf(stderr, "failed to lookup HEAD ref\n");
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return -1;
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}
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/* Grab the reference HEAD should be pointing to */
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symbolic_ref = git_reference_symbolic_target(head_ref);
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/* Create our master reference on the target OID */
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err = git_reference_create(&target_ref, repo, symbolic_ref, target_oid, 0, NULL);
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if (err != 0) {
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fprintf(stderr, "failed to create master reference\n");
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return -1;
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}
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git_reference_free(head_ref);
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} else {
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/* HEAD exists, just lookup and resolve */
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err = git_repository_head(&target_ref, repo);
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if (err != 0) {
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fprintf(stderr, "failed to get HEAD reference\n");
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return -1;
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}
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}
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/* Lookup the target object */
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err = git_object_lookup(&target, repo, target_oid, GIT_OBJECT_COMMIT);
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if (err != 0) {
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fprintf(stderr, "failed to lookup OID %s\n", git_oid_tostr_s(target_oid));
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return -1;
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}
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/* Checkout the result so the workdir is in the expected state */
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ff_checkout_options.checkout_strategy = GIT_CHECKOUT_SAFE;
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err = git_checkout_tree(repo, target, &ff_checkout_options);
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if (err != 0) {
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fprintf(stderr, "failed to checkout HEAD reference\n");
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return -1;
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}
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/* Move the target reference to the target OID */
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err = git_reference_set_target(&new_target_ref, target_ref, target_oid, NULL);
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if (err != 0) {
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fprintf(stderr, "failed to move HEAD reference\n");
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return -1;
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}
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git_reference_free(target_ref);
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git_reference_free(new_target_ref);
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git_object_free(target);
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return 0;
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}
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static void output_conflicts(git_index *index)
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{
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git_index_conflict_iterator *conflicts;
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const git_index_entry *ancestor;
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const git_index_entry *our;
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const git_index_entry *their;
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int err = 0;
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check(git_index_conflict_iterator_new(&conflicts, index), "failed to create conflict iterator", NULL);
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while ((err = git_index_conflict_next(&ancestor, &our, &their, conflicts)) == 0) {
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fprintf(stderr, "conflict: a:%s o:%s t:%s\n",
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ancestor ? ancestor->path : "NULL",
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our->path ? our->path : "NULL",
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their->path ? their->path : "NULL");
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}
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if (err != GIT_ITEROVER) {
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fprintf(stderr, "error iterating conflicts\n");
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}
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git_index_conflict_iterator_free(conflicts);
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}
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static int create_merge_commit(git_repository *repo, git_index *index, struct merge_options *opts)
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{
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git_oid tree_oid, commit_oid;
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git_tree *tree;
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git_signature *sign;
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git_reference *merge_ref = NULL;
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git_annotated_commit *merge_commit;
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git_reference *head_ref;
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git_commit **parents = calloc(opts->annotated_count + 1, sizeof(git_commit *));
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const char *msg_target = NULL;
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size_t msglen = 0;
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char *msg;
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size_t i;
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int err;
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/* Grab our needed references */
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check(git_repository_head(&head_ref, repo), "failed to get repo HEAD", NULL);
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if (resolve_refish(&merge_commit, repo, opts->heads[0])) {
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fprintf(stderr, "failed to resolve refish %s", opts->heads[0]);
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free(parents);
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return -1;
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}
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/* Maybe that's a ref, so DWIM it */
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err = git_reference_dwim(&merge_ref, repo, opts->heads[0]);
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check(err, "failed to DWIM reference", git_error_last()->message);
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/* Grab a signature */
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check(git_signature_now(&sign, "Me", "me@example.com"), "failed to create signature", NULL);
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#define MERGE_COMMIT_MSG "Merge %s '%s'"
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/* Prepare a standard merge commit message */
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if (merge_ref != NULL) {
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check(git_branch_name(&msg_target, merge_ref), "failed to get branch name of merged ref", NULL);
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} else {
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msg_target = git_oid_tostr_s(git_annotated_commit_id(merge_commit));
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}
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msglen = snprintf(NULL, 0, MERGE_COMMIT_MSG, (merge_ref ? "branch" : "commit"), msg_target);
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if (msglen > 0) msglen++;
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msg = malloc(msglen);
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err = snprintf(msg, msglen, MERGE_COMMIT_MSG, (merge_ref ? "branch" : "commit"), msg_target);
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/* This is only to silence the compiler */
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if (err < 0) goto cleanup;
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/* Setup our parent commits */
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err = git_reference_peel((git_object **)&parents[0], head_ref, GIT_OBJECT_COMMIT);
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check(err, "failed to peel head reference", NULL);
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for (i = 0; i < opts->annotated_count; i++) {
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git_commit_lookup(&parents[i + 1], repo, git_annotated_commit_id(opts->annotated[i]));
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}
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/* Prepare our commit tree */
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check(git_index_write_tree(&tree_oid, index), "failed to write merged tree", NULL);
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check(git_tree_lookup(&tree, repo, &tree_oid), "failed to lookup tree", NULL);
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/* Commit time ! */
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err = git_commit_create(&commit_oid,
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repo, git_reference_name(head_ref),
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sign, sign,
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NULL, msg,
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tree,
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opts->annotated_count + 1, parents);
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check(err, "failed to create commit", NULL);
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/* We're done merging, cleanup the repository state */
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git_repository_state_cleanup(repo);
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cleanup:
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free(parents);
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return err;
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}
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static int merge(git_repository *repo) {
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struct merge_options opts;
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git_index *index;
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@ -388,6 +591,72 @@ static int merge(git_repository *repo) {
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merge_options_init(&opts);
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parse_options(&path, &opts);
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state = git_repository_state(repo);
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if (state != GIT_REPOSITORY_STATE_NONE) {
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fprintf(stderr, "repository is in unexpected state %d\n", state);
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goto cleanup;
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}
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err = resolve_heads(repo, &opts);
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if (err != 0)
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goto cleanup;
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err = git_merge_analysis(&analysis, &preference,
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repo,
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(const git_annotated_commit **)opts.annotated,
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opts.annotated_count);
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check(err, "merge analysis failed", NULL);
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if (analysis & GIT_MERGE_ANALYSIS_UP_TO_DATE) {
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printf("Already up-to-date\n");
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return 0;
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} else if (analysis & GIT_MERGE_ANALYSIS_UNBORN ||
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(analysis & GIT_MERGE_ANALYSIS_FASTFORWARD &&
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!(preference & GIT_MERGE_PREFERENCE_NO_FASTFORWARD))) {
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const git_oid *target_oid;
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if (analysis & GIT_MERGE_ANALYSIS_UNBORN) {
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printf("Unborn\n");
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} else {
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printf("Fast-forward\n");
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}
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/* Since this is a fast-forward, there can be only one merge head */
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target_oid = git_annotated_commit_id(opts.annotated[0]);
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assert(opts.annotated_count == 1);
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return perform_fastforward(repo, target_oid, (analysis & GIT_MERGE_ANALYSIS_UNBORN));
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} else if (analysis & GIT_MERGE_ANALYSIS_NORMAL) {
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git_merge_options merge_opts = GIT_MERGE_OPTIONS_INIT;
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git_checkout_options checkout_opts = GIT_CHECKOUT_OPTIONS_INIT;
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merge_opts.flags = 0;
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merge_opts.file_flags = GIT_MERGE_FILE_STYLE_DIFF3;
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checkout_opts.checkout_strategy = GIT_CHECKOUT_FORCE|GIT_CHECKOUT_ALLOW_CONFLICTS;
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if (preference & GIT_MERGE_PREFERENCE_FASTFORWARD_ONLY) {
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printf("Fast-forward is preferred, but only a merge is possible\n");
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return -1;
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}
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err = git_merge(repo,
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(const git_annotated_commit **)opts.annotated, opts.annotated_count,
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&merge_opts, &checkout_opts);
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check(err, "merge failed", NULL);
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}
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/* If we get here, we actually performed the merge above */
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check(git_repository_index(&index, repo), "failed to get repository index", NULL);
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if (git_index_has_conflicts(index)) {
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/* Handle conflicts */
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output_conflicts(index);
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} else if (!opts.no_commit) {
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create_merge_commit(repo, index, &opts);
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printf("Merge made\n");
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}
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cleanup:
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free((char **)opts.heads);
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free(opts.annotated);
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