$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-memocombinators.git /var/lib/mock/f41-build-837907-159471/root/chroot_tmpdir/scmroot/ghc-data-memocombinators
Cloning into '/var/lib/mock/f41-build-837907-159471/root/chroot_tmpdir/scmroot/ghc-data-memocombinators'...
$ git fetch origin 751715ebbfc581e3548e1c9ccc0295ff42ff2372:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-data-memocombinators
 * [new ref]         751715ebbfc581e3548e1c9ccc0295ff42ff2372 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 751715e bump release