$ git clone -n https://src.fedoraproject.org/rpms/plasma-thunderbolt.git /var/lib/mock/f40-build-1509070-23893/root/chroot_tmpdir/scmroot/plasma-thunderbolt
Cloning into '/var/lib/mock/f40-build-1509070-23893/root/chroot_tmpdir/scmroot/plasma-thunderbolt'...
$ git fetch origin 892adc6e839ab00d52b1b3758e42a4c675c6e615:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-thunderbolt
 * [new ref]         892adc6e839ab00d52b1b3758e42a4c675c6e615 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 892adc6 6.1.2