$ git clone -n https://src.fedoraproject.org/rpms/fflas-ffpack.git /var/lib/mock/f39-build-1625699-39196/root/chroot_tmpdir/scmroot/fflas-ffpack
Cloning into '/var/lib/mock/f39-build-1625699-39196/root/chroot_tmpdir/scmroot/fflas-ffpack'...
$ git fetch origin 57a6ce68a49b27a2f73ff4eff553d044040a59e5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fflas-ffpack
 * [new ref]         57a6ce68a49b27a2f73ff4eff553d044040a59e5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57a6ce6 Update to 2.5.0 (close RHBZ#2032590)