$ git clone -n https://src.fedoraproject.org/rpms/ghc-xml.git /var/lib/mock/f38-build-side-42-init-devel-885429-28488/root/chroot_tmpdir/scmroot/ghc-xml
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-885429-28488/root/chroot_tmpdir/scmroot/ghc-xml'...
$ git fetch origin 454c3c6e8d995c7acceeef8848b58e1985dd0521:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-xml
 * [new ref]         454c3c6e8d995c7acceeef8848b58e1985dd0521 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 454c3c6 Convert to %autorelease and %autochangelog