$ git clone -n https://src.fedoraproject.org/rpms/ghc-path-pieces.git /var/lib/mock/f41-build-837768-159384/root/chroot_tmpdir/scmroot/ghc-path-pieces
Cloning into '/var/lib/mock/f41-build-837768-159384/root/chroot_tmpdir/scmroot/ghc-path-pieces'...
$ git fetch origin 7c06cc2ad2f744e412cee696999712deb4096613:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-path-pieces
 * [new ref]         7c06cc2ad2f744e412cee696999712deb4096613 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7c06cc2 bump release