$ git clone -n https://src.fedoraproject.org/rpms/ghc-SafeSemaphore.git /var/lib/mock/f40-build-742822-110925/root/chroot_tmpdir/scmroot/ghc-SafeSemaphore
Cloning into '/var/lib/mock/f40-build-742822-110925/root/chroot_tmpdir/scmroot/ghc-SafeSemaphore'...
$ git fetch origin 210838c02de08377d0016b6a15af03153d6b57b3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-SafeSemaphore
 * [new ref]         210838c02de08377d0016b6a15af03153d6b57b3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 210838c bump release