$ git clone -n https://src.fedoraproject.org/rpms/ghc-pipes.git /var/lib/mock/f41-build-839117-159994/root/chroot_tmpdir/scmroot/ghc-pipes
Cloning into '/var/lib/mock/f41-build-839117-159994/root/chroot_tmpdir/scmroot/ghc-pipes'...
$ git fetch origin f15d436b758148fc619ddf8e969fe3d8d02751dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-pipes
 * [new ref]         f15d436b758148fc619ddf8e969fe3d8d02751dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f15d436 bump release