$ git clone -n https://github.com/xcp-ng-rpms/intel-microcode.git /var/lib/mock/v8.3-u-prebuild-9337-28088/root/chroot_tmpdir/scmroot/intel-microcode
Cloning into '/var/lib/mock/v8.3-u-prebuild-9337-28088/root/chroot_tmpdir/scmroot/intel-microcode'...
$ git fetch origin aa5b7e5f1e98fa6320809a1b57c87e196deda3fd:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/intel-microcode
 * [new ref]         aa5b7e5f1e98fa6320809a1b57c87e196deda3fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa5b7e5 bump release for test build