$ git clone -n https://src.fedoraproject.org/rpms/ghc-primitive.git /var/lib/mock/f39-build-1926715-43046/root/chroot_tmpdir/scmroot/ghc-primitive
Cloning into '/var/lib/mock/f39-build-1926715-43046/root/chroot_tmpdir/scmroot/ghc-primitive'...
$ git fetch origin 4d7e25a1c9a1fb366854a65d844b1dc0277f071c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-primitive
 * [new ref]         4d7e25a1c9a1fb366854a65d844b1dc0277f071c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d7e25a https://hackage.haskell.org/package/primitive-0.8.0.0/changelog