$ git clone -n https://src.fedoraproject.org/rpms/ghc-wai-handler-launch.git /var/lib/mock/f39-build-2012221-45774/root/chroot_tmpdir/scmroot/ghc-wai-handler-launch
Cloning into '/var/lib/mock/f39-build-2012221-45774/root/chroot_tmpdir/scmroot/ghc-wai-handler-launch'...
$ git fetch origin 28d087d655e538cb6d16c71eaf468ef3126d7172:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-wai-handler-launch
 * [new ref]         28d087d655e538cb6d16c71eaf468ef3126d7172 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28d087d bump release