$ git clone -n https://src.fedoraproject.org/rpms/vulkan-loader.git /var/lib/mock/f40-build-788459-135161/root/chroot_tmpdir/scmroot/vulkan-loader
Cloning into '/var/lib/mock/f40-build-788459-135161/root/chroot_tmpdir/scmroot/vulkan-loader'...
$ git fetch origin 3ddfd17f1514509e6d4fce348dc0f32c500398eb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vulkan-loader
 * [new ref]         3ddfd17f1514509e6d4fce348dc0f32c500398eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ddfd17 Update to 1.3.275.0 SDK