$ git clone -n https://src.fedoraproject.org/rpms/ghc-cookie.git /var/lib/mock/f41-build-837897-159471/root/chroot_tmpdir/scmroot/ghc-cookie
Cloning into '/var/lib/mock/f41-build-837897-159471/root/chroot_tmpdir/scmroot/ghc-cookie'...
$ git fetch origin 39a396a6d792eeff314dc9df329a8ee96e7410fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cookie
 * [new ref]         39a396a6d792eeff314dc9df329a8ee96e7410fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 39a396a bump release