$ git clone -n https://src.fedoraproject.org/rpms/kblackbox.git /var/lib/mock/f39-build-1600809-38548/root/chroot_tmpdir/scmroot/kblackbox
Cloning into '/var/lib/mock/f39-build-1600809-38548/root/chroot_tmpdir/scmroot/kblackbox'...
$ git fetch origin 9a16380e1fccbe01d1d9e5f6a9ae9fc71a4313da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kblackbox
 * [new ref]         9a16380e1fccbe01d1d9e5f6a9ae9fc71a4313da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a16380 23.08.2