$ git clone -n https://src.fedoraproject.org/rpms/vulkan-loader.git /var/lib/mock/f42-build-side-1-3540011-46572/root/chroot_tmpdir/scmroot/vulkan-loader
Cloning into '/var/lib/mock/f42-build-side-1-3540011-46572/root/chroot_tmpdir/scmroot/vulkan-loader'...
$ git fetch origin 2ee187137401d0c97d0f9db3486b62c26d7757c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vulkan-loader
 * [new ref]         2ee187137401d0c97d0f9db3486b62c26d7757c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ee1871 Update to SDK v1.4.313.0