bundle: add bundle verification options type

When `unbundle()` is invoked, fsck verification may be configured by
passing the `VERIFY_BUNDLE_FSCK` flag. This mechanism allows fsck checks
on the bundle to be enabled or disabled entirely. To facilitate more
fine-grained fsck configuration, additional context must be provided to
`unbundle()`.

Introduce the `unbundle_opts` type, which wraps the existing
`verify_bundle_flags`, to facilitate future extension of `unbundle()`
configuration. Also update `unbundle()` and its call sites to accept
this new options type instead of the flags directly. The end behavior is
functionally the same, but allows for the set of configurable options to
be extended. This is leveraged in a subsequent commit to enable fsck
message severity configuration.

Signed-off-by: Justin Tobler <jltobler@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/bundle.c

@@ -218,7 +218,7 @@ static int cmd_bundle_unbundle(int argc, const char **argv, const char *prefix)
 		strvec_pushl(&extra_index_pack_args, "-v", "--progress-title",
 			     _("Unbundling objects"), NULL);
 	ret = !!unbundle(the_repository, &header, bundle_fd,
-			 &extra_index_pack_args, 0) ||
+			 &extra_index_pack_args, NULL) ||
 		list_bundle_refs(&header, argc, argv);
 	bundle_header_release(&header);
 

bundle-uri.c

@@ -367,6 +367,10 @@ static int unbundle_from_file(struct repository *r, const char *file)
 	struct string_list_item *refname;
 	struct strbuf bundle_ref = STRBUF_INIT;
 	size_t bundle_prefix_len;
+	struct unbundle_opts opts = {
+		.flags = VERIFY_BUNDLE_QUIET |
+			 (fetch_pack_fsck_objects() ? VERIFY_BUNDLE_FSCK : 0),
+	};
 
 	bundle_fd = read_bundle_header(file, &header);
 	if (bundle_fd < 0) {
@@ -379,8 +383,7 @@ static int unbundle_from_file(struct repository *r, const char *file)
 	 * a reachable ref pointing to the new tips, which will reach
 	 * the prerequisite commits.
 	 */
-	result = unbundle(r, &header, bundle_fd, NULL,
-			  VERIFY_BUNDLE_QUIET | (fetch_pack_fsck_objects() ? VERIFY_BUNDLE_FSCK : 0));
+	result = unbundle(r, &header, bundle_fd, NULL, &opts);
 	if (result) {
 		result = 1;
 		goto cleanup;

bundle.c

@@ -628,9 +628,13 @@ out:
 
 int unbundle(struct repository *r, struct bundle_header *header,
 	     int bundle_fd, struct strvec *extra_index_pack_args,
-	     enum verify_bundle_flags flags)
+	     struct unbundle_opts *opts)
 {
 	struct child_process ip = CHILD_PROCESS_INIT;
+	enum verify_bundle_flags flags = 0;
+
+	if (opts)
+		flags = opts->flags;
 
 	if (verify_bundle(r, header, flags))
 		return -1;

bundle.h

@@ -39,6 +39,10 @@ enum verify_bundle_flags {
 int verify_bundle(struct repository *r, struct bundle_header *header,
 		  enum verify_bundle_flags flags);
 
+struct unbundle_opts {
+	enum verify_bundle_flags flags;
+};
+
 /**
  * Unbundle after reading the header with read_bundle_header().
  *
@@ -49,12 +53,12 @@ int verify_bundle(struct repository *r, struct bundle_header *header,
  * (e.g. "-v" for verbose/progress), NULL otherwise. The provided
  * "extra_index_pack_args" (if any) will be strvec_clear()'d for you.
  *
- * Before unbundling, this method will call verify_bundle() with the
- * given 'flags'.
+ * Before unbundling, this method will call verify_bundle() with 'flags'
+ * provided in 'opts'.
  */
 int unbundle(struct repository *r, struct bundle_header *header,
 	     int bundle_fd, struct strvec *extra_index_pack_args,
-	     enum verify_bundle_flags flags);
+	     struct unbundle_opts *opts);
 int list_bundle_refs(struct bundle_header *header,
 		int argc, const char **argv);
 

transport.c

@@ -176,6 +176,9 @@ static int fetch_refs_from_bundle(struct transport *transport,
 				  int nr_heads UNUSED,
 				  struct ref **to_fetch UNUSED)
 {
+	struct unbundle_opts opts = {
+		.flags = fetch_pack_fsck_objects() ? VERIFY_BUNDLE_FSCK : 0,
+	};
 	struct bundle_transport_data *data = transport->data;
 	struct strvec extra_index_pack_args = STRVEC_INIT;
 	int ret;
@@ -186,8 +189,7 @@ static int fetch_refs_from_bundle(struct transport *transport,
 	if (!data->get_refs_from_bundle_called)
 		get_refs_from_bundle_inner(transport);
 	ret = unbundle(the_repository, &data->header, data->fd,
-		       &extra_index_pack_args,
-		       fetch_pack_fsck_objects() ? VERIFY_BUNDLE_FSCK : 0);
+		       &extra_index_pack_args, &opts);
 	transport->hash_algo = data->header.hash_algo;
 
 	strvec_clear(&extra_index_pack_args);