$ git clone -n https://src.fedoraproject.org/rpms/ghc-hspec-core.git /var/lib/mock/f39-build-1930211-43103/root/chroot_tmpdir/scmroot/ghc-hspec-core
Cloning into '/var/lib/mock/f39-build-1930211-43103/root/chroot_tmpdir/scmroot/ghc-hspec-core'...
$ git fetch origin d7c20471de6e27f12f6d70dbfec505bd669384a4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hspec-core
 * [new ref]         d7c20471de6e27f12f6d70dbfec505bd669384a4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d7c2047 https://hackage.haskell.org/package/hspec-core-2.10.10/changelog