Merge branch 'jk/bisect-peel-tag-fix'

"git bisect" reimplemented more in C during 2.30 timeframe did not
take an annotated tag as a good/bad endpoint well.  This regression
has been corrected.

* jk/bisect-peel-tag-fix:
  bisect: peel annotated tags to commits

Author: gitster

builtin/bisect--helper.c

@@ -874,12 +874,19 @@ static enum bisect_error bisect_state(struct bisect_terms *terms, const char **a
 	 */
 
 	for (; argc; argc--, argv++) {
+		struct commit *commit;
+
 		if (get_oid(*argv, &oid)){
 			error(_("Bad rev input: %s"), *argv);
 			oid_array_clear(&revs);
 			return BISECT_FAILED;
 		}
-		oid_array_append(&revs, &oid);
+
+		commit = lookup_commit_reference(the_repository, &oid);
+		if (!commit)
+			die(_("Bad rev input (not a commit): %s"), *argv);
+
+		oid_array_append(&revs, &commit->object.oid);
 	}
 
 	if (strbuf_read_file(&buf, git_path_bisect_expected_rev(), 0) < the_hash_algo->hexsz ||

t/t6030-bisect-porcelain.sh

@@ -939,4 +939,16 @@ test_expect_success 'git bisect reset cleans bisection state properly' '
 	test_path_is_missing ".git/BISECT_START"
 '
 
+test_expect_success 'bisect handles annotated tags' '
+	test_commit commit-one &&
+	git tag -m foo tag-one &&
+	test_commit commit-two &&
+	git tag -m foo tag-two &&
+	git bisect start &&
+	git bisect good tag-one &&
+	git bisect bad tag-two >output &&
+	bad=$(git rev-parse --verify tag-two^{commit}) &&
+	grep "$bad is the first bad commit" output
+'
+
 test_done