$ git clone -n https://src.fedoraproject.org/rpms/ghc-simple-cmd.git /var/lib/mock/f39-build-1938489-43142/root/chroot_tmpdir/scmroot/ghc-simple-cmd
Cloning into '/var/lib/mock/f39-build-1938489-43142/root/chroot_tmpdir/scmroot/ghc-simple-cmd'...
$ git fetch origin 09ef5b98eff76dce79b34084c775373125c4f3ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-simple-cmd
 * [new ref]         09ef5b98eff76dce79b34084c775373125c4f3ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09ef5b9 bump release