$ git clone -n https://src.fedoraproject.org/rpms/lttng-tools.git /var/lib/mock/f40-build-791545-137603/root/chroot_tmpdir/scmroot/lttng-tools
Cloning into '/var/lib/mock/f40-build-791545-137603/root/chroot_tmpdir/scmroot/lttng-tools'...
$ git fetch origin 4d0700a830b233e4dac57069dbd6744900d7e20f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lttng-tools
 * [new ref]         4d0700a830b233e4dac57069dbd6744900d7e20f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4d0700a Remove patch merged upstream (RHBZ:#2246352)