$ git clone -n https://src.fedoraproject.org/rpms/linuxptp.git /var/lib/mock/f40-build-805651-144835/root/chroot_tmpdir/scmroot/linuxptp
Cloning into '/var/lib/mock/f40-build-805651-144835/root/chroot_tmpdir/scmroot/linuxptp'...
$ git reset --hard efffbe406f41997ec02d9bad74d7619923a32bf3
HEAD is now at efffbe4 4.2-4