$ git clone -n https://src.fedoraproject.org/rpms/ghc-skein.git /var/lib/mock/f39-build-2077264-49558/root/chroot_tmpdir/scmroot/ghc-skein
Cloning into '/var/lib/mock/f39-build-2077264-49558/root/chroot_tmpdir/scmroot/ghc-skein'...
$ git fetch origin 65c5eeeb03c839839d3b3e7a0be849ca723a9478:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-skein
 * [new ref]         65c5eeeb03c839839d3b3e7a0be849ca723a9478 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65c5eee bump release