$ git clone -n https://src.fedoraproject.org/rpms/ghc-tf-random.git /var/lib/mock/f39-build-1507506-35269/root/chroot_tmpdir/scmroot/ghc-tf-random
Cloning into '/var/lib/mock/f39-build-1507506-35269/root/chroot_tmpdir/scmroot/ghc-tf-random'...
$ git fetch origin 76fad0517f924040fa1f0ce60e3f7b39224e510a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-tf-random
 * [new ref]         76fad0517f924040fa1f0ce60e3f7b39224e510a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 76fad05 bump release