$ git clone -n https://src.fedoraproject.org/rpms/ghc-STMonadTrans.git /var/lib/mock/f40-build-743567-111265/root/chroot_tmpdir/scmroot/ghc-STMonadTrans
Cloning into '/var/lib/mock/f40-build-743567-111265/root/chroot_tmpdir/scmroot/ghc-STMonadTrans'...
$ git fetch origin 73efa324c4105ac87b1dd35a9877e6725c76c2bf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-STMonadTrans
 * [new ref]         73efa324c4105ac87b1dd35a9877e6725c76c2bf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 73efa32 https://hackage.haskell.org/package/STMonadTrans-0.4.7/changelog