$ git clone -n https://src.fedoraproject.org/rpms/haskell-platform.git /var/lib/mock/f39-build-2444689-61041/root/chroot_tmpdir/scmroot/haskell-platform
Cloning into '/var/lib/mock/f39-build-2444689-61041/root/chroot_tmpdir/scmroot/haskell-platform'...
$ git fetch origin fb1edd4740d9633126d207290f3fef7ef6d5e3ce:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/haskell-platform
 * [new ref]         fb1edd4740d9633126d207290f3fef7ef6d5e3ce -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb1edd4 make stack-symlink-distro-ghc executable