$ git clone -n https://src.fedoraproject.org/rpms/ghc-haddock-library.git /var/lib/mock/f39-build-1507082-35224/root/chroot_tmpdir/scmroot/ghc-haddock-library
Cloning into '/var/lib/mock/f39-build-1507082-35224/root/chroot_tmpdir/scmroot/ghc-haddock-library'...
$ git fetch origin a3c11eb2d4e438f8235dd060cbdcd528f5a57c31:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-haddock-library
 * [new ref]         a3c11eb2d4e438f8235dd060cbdcd528f5a57c31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3c11eb https://hackage.haskell.org/package/haddock-library-1.11.0/changelog