$ git clone -n https://src.fedoraproject.org/rpms/heaptrack.git /var/lib/mock/f40-build-2218941-52622/root/chroot_tmpdir/scmroot/heaptrack
Cloning into '/var/lib/mock/f40-build-2218941-52622/root/chroot_tmpdir/scmroot/heaptrack'...
$ git fetch origin 5df563d996e0a1b09dd413046c3694e904e4e58e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/heaptrack
 * [new ref]         5df563d996e0a1b09dd413046c3694e904e4e58e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5df563d Upload 1.5.0 sources