$ git clone -n https://src.fedoraproject.org/rpms/vulkan-headers.git /var/lib/mock/f42-build-side-1-3537107-46559/root/chroot_tmpdir/scmroot/vulkan-headers
Cloning into '/var/lib/mock/f42-build-side-1-3537107-46559/root/chroot_tmpdir/scmroot/vulkan-headers'...
$ git fetch origin 47485efa04c68bed3bb69f466e7f31e29d84781c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vulkan-headers
 * [new ref]         47485efa04c68bed3bb69f466e7f31e29d84781c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47485ef Update to SDK v1.4.313.0