$ git clone -n https://src.fedoraproject.org/rpms/ghc-ConfigFile.git /var/lib/mock/f38-build-side-42-init-devel-763372-27709/root/chroot_tmpdir/scmroot/ghc-ConfigFile
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-763372-27709/root/chroot_tmpdir/scmroot/ghc-ConfigFile'...
$ git fetch origin 6fd8096fb087ef7600ad9bd5abc136fa5a246eb4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-ConfigFile
 * [new ref]         6fd8096fb087ef7600ad9bd5abc136fa5a246eb4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6fd8096 Convert to %autorelease and %autochangelog