$ git clone -n https://src.fedoraproject.org/rpms/ghc-utf8-string.git /var/lib/mock/f38-build-side-42-init-devel-908900-28678/root/chroot_tmpdir/scmroot/ghc-utf8-string
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-908900-28678/root/chroot_tmpdir/scmroot/ghc-utf8-string'...
$ git fetch origin 9be461359679f4320dd1d651a5a91565b7691178:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-utf8-string
 * [new ref]         9be461359679f4320dd1d651a5a91565b7691178 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9be4613 Convert to %autorelease and %autochangelog