$ git clone -n https://src.fedoraproject.org/rpms/systemtap.git /var/lib/mock/f39-build-1540353-36471/root/chroot_tmpdir/scmroot/systemtap
Cloning into '/var/lib/mock/f39-build-1540353-36471/root/chroot_tmpdir/scmroot/systemtap'...
$ git fetch origin d68c31dcf6caae95428d5c6578fe205fa42f6e59:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/systemtap
 * [new ref]         d68c31dcf6caae95428d5c6578fe205fa42f6e59 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d68c31d CI Tests:  Update Regression/ipv6-tapset-support