$ git clone -n https://src.fedoraproject.org/rpms/ghc-ilist.git /var/lib/mock/f39-build-1926631-43042/root/chroot_tmpdir/scmroot/ghc-ilist
Cloning into '/var/lib/mock/f39-build-1926631-43042/root/chroot_tmpdir/scmroot/ghc-ilist'...
$ git fetch origin adaf7e0431fab7cd1d4f0a2d0544336cead43433:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-ilist
 * [new ref]         adaf7e0431fab7cd1d4f0a2d0544336cead43433 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at adaf7e0 bump base upperbound