builtin: use default hash when outside a repository

We have some commands that can operate inside or outside a repository.
If we're operating outside a repository, we clearly cannot use the
repository's hash algorithm as a default since it doesn't exist, so
instead, let's pick the default instead of specifically SHA-1.  Right
now this results in no functional change since the default is SHA-1, but
that may change in the future.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: bk2204

builtin/apply.c

@@ -29,7 +29,7 @@ int cmd_apply(int argc,
 	 * cf. https://lore.kernel.org/git/xmqqcypfcmn4.fsf@gitster.g/
 	 */
 	if (!the_hash_algo)
-		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
+		repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
 
 	argc = apply_parse_options(argc, argv,
 				   &state, &force_apply, &options,

builtin/diff.c

@@ -483,7 +483,7 @@ int cmd_diff(int argc,
 	 * configurable via a command line option.
 	 */
 	if (nongit)
-		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
+		repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
 
 	init_diff_ui_defaults();
 	git_config(git_diff_ui_config, NULL);

builtin/hash-object.c

@@ -104,7 +104,7 @@ int cmd_hash_object(int argc,
 		prefix = setup_git_directory_gently(&nongit);
 
 	if (nongit && !the_hash_algo)
-		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
+		repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
 
 	if (vpath && prefix) {
 		vpath_free = prefix_filename(prefix, vpath);

builtin/index-pack.c

@@ -2034,7 +2034,7 @@ int cmd_index_pack(int argc,
 	 * choice but to guess the object hash.
 	 */
 	if (!the_repository->hash_algo)
-		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
+		repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
 
 	opts.flags &= ~(WRITE_REV | WRITE_REV_VERIFY);
 	if (rev_index) {

builtin/ls-remote.c

@@ -112,7 +112,7 @@ int cmd_ls_remote(int argc,
 	 * depending on what object hash the remote uses.
 	 */
 	if (!the_repository->hash_algo)
-		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
+		repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
 
 	packet_trace_identity("ls-remote");
 

builtin/patch-id.c

@@ -254,7 +254,7 @@ int cmd_patch_id(int argc,
 	 * the code that computes patch IDs to always use SHA1.
 	 */
 	if (!the_hash_algo)
-		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
+		repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
 
 	generate_id_list(opts ? opts > 1 : config.stable,
 			 opts ? opts == 3 : config.verbatim);

builtin/shortlog.c

@@ -418,7 +418,7 @@ int cmd_shortlog(int argc,
 	 * git/nongit so that we do not have to do this.
 	 */
 	if (nongit && !the_hash_algo)
-		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
+		repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
 
 	git_config(git_default_config, NULL);
 	shortlog_init(&log);

builtin/show-index.c

@@ -47,7 +47,7 @@ int cmd_show_index(int argc,
 	 *       the index file passed in and use that instead.
 	 */
 	if (!the_hash_algo)
-		repo_set_hash_algo(the_repository, GIT_HASH_SHA1);
+		repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
 
 	hashsz = the_hash_algo->rawsz;