$ git clone -n https://src.fedoraproject.org/rpms/ghc-cookie.git /var/lib/mock/f38-build-side-42-init-devel-749854-27661/root/chroot_tmpdir/scmroot/ghc-cookie
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-749854-27661/root/chroot_tmpdir/scmroot/ghc-cookie'...
$ git fetch origin fddbb3ebee29b40cb3c3e1f481f7b44965b01759:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cookie
 * [new ref]         fddbb3ebee29b40cb3c3e1f481f7b44965b01759 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fddbb3e Convert to %autorelease and %autochangelog