$ git clone -n https://src.fedoraproject.org/rpms/ghc-concurrent-extra.git /var/lib/mock/f41-build-side-1-2636560-26242/root/chroot_tmpdir/scmroot/ghc-concurrent-extra
Cloning into '/var/lib/mock/f41-build-side-1-2636560-26242/root/chroot_tmpdir/scmroot/ghc-concurrent-extra'...
$ git fetch origin e829fc985aba4ea4e914bd1b050c60cd62ce5010:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-concurrent-extra
 * [new ref]         e829fc985aba4ea4e914bd1b050c60cd62ce5010 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e829fc9 bump release