[PATCH 20/24] bundle-uri client: add boolean transfer.bundleURI setting

["Ævar Arnfjörð Bjarmason via GitGitGadget" <gitgitgadget@gmail.com>]

From: =?UTF-8?q?=C3=86var=20Arnfj=C3=B6r=C3=B0=20Bjarmason?=
 <avarab@gmail.com>

The yet-to-be introduced client support for bundle-uri will always
fall back on a full clone, but we'd still like to be able to ignore a
server's bundle-uri advertisement entirely.

The new transfer.bundleURI config option defaults to 'false', but a user
can set it to 'true' to enable checking for bundle URIs from the origin
Git server using protocol v2.

To enable this setting by default in the correct tests, add a
GIT_TEST_BUNDLE_URI environment variable.

Co-authored-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
---
 Documentation/config/transfer.txt     |  6 ++++++
 t/lib-t5730-protocol-v2-bundle-uri.sh |  3 +++
 transport.c                           | 10 +++++++---
 3 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/Documentation/config/transfer.txt b/Documentation/config/transfer.txt
index b49429eb4db..337a7886546 100644
--- a/Documentation/config/transfer.txt
+++ b/Documentation/config/transfer.txt
@@ -77,3 +77,9 @@ transfer.unpackLimit::
 transfer.advertiseSID::
 	Boolean. When true, client and server processes will advertise their
 	unique session IDs to their remote counterpart. Defaults to false.
+
+transfer.bundleURI::
+	When set to `false` ignores any server advertisement of
+	`bundle-uri` and proceed with a "normal" clone/fetch even if
+	using bundles to bootstap is possible. Defaults to `true`,
+	i.e. bundle-uri is tried whenever a server offers it.
diff --git a/t/lib-t5730-protocol-v2-bundle-uri.sh b/t/lib-t5730-protocol-v2-bundle-uri.sh
index 23f2de0d9d7..49d4d848cac 100644
--- a/t/lib-t5730-protocol-v2-bundle-uri.sh
+++ b/t/lib-t5730-protocol-v2-bundle-uri.sh
@@ -1,5 +1,8 @@
 # Included from t573*-protocol-v2-bundle-uri-*.sh
 
+GIT_TEST_BUNDLE_URI=1
+export GIT_TEST_BUNDLE_URI
+
 T5730_PARENT=
 T5730_URI=
 T5730_BUNDLE_URI=
diff --git a/transport.c b/transport.c
index c9d2e1804eb..f0114778ff4 100644
--- a/transport.c
+++ b/transport.c
@@ -1529,6 +1529,7 @@ int transport_fetch_refs(struct transport *transport, struct ref *refs)
 
 int transport_get_remote_bundle_uri(struct transport *transport, int quiet)
 {
+	int value = 0;
 	const struct transport_vtable *vtable = transport->vtable;
 
 	/* Check config only once. */
@@ -1536,10 +1537,13 @@ int transport_get_remote_bundle_uri(struct transport *transport, int quiet)
 		return 0;
 
 	/*
-	 * This is intentionally below the transport.injectBundleURI,
-	 * we want to be able to inject into protocol v0, or into the
-	 * dialog of a server who doesn't support this.
+	 * Don't use bundle-uri at all, if configured not to.
+	 * This logic defaults "transfer.bundleURI" to false.
 	 */
+	if (!git_env_bool("GIT_TEST_BUNDLE_URI", 0) &&
+	    (git_config_get_bool("transfer.bundleuri", &value) || !value))
+		return 0;
+
 	if (!vtable->get_bundle_uri) {
 		if (quiet)
 			return -1;
-- 
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