$ git clone -n https://src.fedoraproject.org/rpms/ghc-uuid.git /var/lib/mock/f41-build-839688-160331/root/chroot_tmpdir/scmroot/ghc-uuid
Cloning into '/var/lib/mock/f41-build-839688-160331/root/chroot_tmpdir/scmroot/ghc-uuid'...
$ git fetch origin 3c3da7e617b7cd7ca7f1b5a40fe3b5a4ae4d4002:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-uuid
 * [new ref]         3c3da7e617b7cd7ca7f1b5a40fe3b5a4ae4d4002 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c3da7e refresh .cabal revision