$ git clone -n https://src.fedoraproject.org/rpms/speedtest.git /var/lib/mock/f39-build-2263751-54523/root/chroot_tmpdir/scmroot/speedtest
Cloning into '/var/lib/mock/f39-build-2263751-54523/root/chroot_tmpdir/scmroot/speedtest'...
$ git fetch origin 04028b130e79056aa7977265d3cc0350294e9a8b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/speedtest
 * [new ref]         04028b130e79056aa7977265d3cc0350294e9a8b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 04028b1 build: Add aiohttp dep (rh#2257535)