$ git clone -n https://src.fedoraproject.org/rpms/ghc-concurrent-output.git /var/lib/mock/f45-build-10125-413/root/chroot_tmpdir/scmroot/ghc-concurrent-output
Cloning into '/var/lib/mock/f45-build-10125-413/root/chroot_tmpdir/scmroot/ghc-concurrent-output'...
$ git fetch origin 94fcdc500967cbc3d9a511366bdaa069db89618d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-concurrent-output
 * [new ref]         94fcdc500967cbc3d9a511366bdaa069db89618d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94fcdc5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild