$ git clone -n https://src.fedoraproject.org/rpms/ghc-crypto-random.git /var/lib/mock/f39-build-1507709-35294/root/chroot_tmpdir/scmroot/ghc-crypto-random
Cloning into '/var/lib/mock/f39-build-1507709-35294/root/chroot_tmpdir/scmroot/ghc-crypto-random'...
$ git fetch origin 62d87494ee0a5793bfef868427391b2e5158e5c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-crypto-random
 * [new ref]         62d87494ee0a5793bfef868427391b2e5158e5c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 62d8749 revised .cabal file