$ git clone -n https://src.fedoraproject.org/rpms/spirv-headers.git /var/lib/mock/f39-build-1909686-42872/root/chroot_tmpdir/scmroot/spirv-headers
Cloning into '/var/lib/mock/f39-build-1909686-42872/root/chroot_tmpdir/scmroot/spirv-headers'...
$ git fetch origin 81a6f8e660722a08768b3cfed08fa40c48e9e002:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/spirv-headers
 * [new ref]         81a6f8e660722a08768b3cfed08fa40c48e9e002 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 81a6f8e update to 1.3.268.0 SDK