$ git clone -n https://src.fedoraproject.org/rpms/ghc-cheapskate.git /var/lib/mock/f39-build-1714921-41229/root/chroot_tmpdir/scmroot/ghc-cheapskate
Cloning into '/var/lib/mock/f39-build-1714921-41229/root/chroot_tmpdir/scmroot/ghc-cheapskate'...
$ git fetch origin b7385008fb4a5e0ef93a60470e620335d7bac1ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cheapskate
 * [new ref]         b7385008fb4a5e0ef93a60470e620335d7bac1ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b738500 bump text bound