$ git clone -n https://src.fedoraproject.org/rpms/ghc-xml-hamlet.git /var/lib/mock/f38-build-side-42-init-devel-1323339-30692/root/chroot_tmpdir/scmroot/ghc-xml-hamlet
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1323339-30692/root/chroot_tmpdir/scmroot/ghc-xml-hamlet'...
$ git fetch origin b58490c676967021c79215d80377fc660c6d2914:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-xml-hamlet
 * [new ref]         b58490c676967021c79215d80377fc660c6d2914 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b58490c Convert to %autorelease and %autochangelog