$ git clone -n https://src.fedoraproject.org/rpms/ghc-time-manager.git /var/lib/mock/f41-build-839612-160255/root/chroot_tmpdir/scmroot/ghc-time-manager
Cloning into '/var/lib/mock/f41-build-839612-160255/root/chroot_tmpdir/scmroot/ghc-time-manager'...
$ git fetch origin dfacac81fd1077aa0d17cd20d534bdb402f2d0dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-time-manager
 * [new ref]         dfacac81fd1077aa0d17cd20d534bdb402f2d0dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dfacac8 https://hackage.haskell.org/package/time-manager-0.0.1/changelog