$ git clone -n https://src.fedoraproject.org/rpms/tracker.git /var/lib/mock/f40-build-804407-144515/root/chroot_tmpdir/scmroot/tracker
Cloning into '/var/lib/mock/f40-build-804407-144515/root/chroot_tmpdir/scmroot/tracker'...
$ git fetch origin 24b2abc97c7048594ca8ccf62118f05e20f528ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tracker
 * [new ref]         24b2abc97c7048594ca8ccf62118f05e20f528ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24b2abc Update to 3.7.1