$ git clone -n https://src.fedoraproject.org/rpms/ghc-mockery.git /var/lib/mock/f39-build-2148171-50888/root/chroot_tmpdir/scmroot/ghc-mockery
Cloning into '/var/lib/mock/f39-build-2148171-50888/root/chroot_tmpdir/scmroot/ghc-mockery'...
$ git fetch origin 1438703e634de819ce3d88b3f6b7532e99061052:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-mockery
 * [new ref]         1438703e634de819ce3d88b3f6b7532e99061052 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1438703 bump release