$ git clone -n https://src.fedoraproject.org/rpms/kf5-purpose.git /var/lib/mock/f40-build-2292780-56157/root/chroot_tmpdir/scmroot/kf5-purpose
Cloning into '/var/lib/mock/f40-build-2292780-56157/root/chroot_tmpdir/scmroot/kf5-purpose'...
$ git fetch origin 5a2a91c02672b3e0f5992baaebe6a3baf0a213f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-purpose
 * [new ref]         5a2a91c02672b3e0f5992baaebe6a3baf0a213f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a2a91c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild