$ git clone -n https://src.fedoraproject.org/rpms/tor.git /var/lib/mock/f39-build-1562442-37439/root/chroot_tmpdir/scmroot/tor
Cloning into '/var/lib/mock/f39-build-1562442-37439/root/chroot_tmpdir/scmroot/tor'...
$ git fetch origin 004b2d22fca0df4768291dd06e055fea98e3ec58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tor
 * [new ref]         004b2d22fca0df4768291dd06e055fea98e3ec58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 004b2d2 update to latest upstrea 0.4.8.7