$ git clone -n https://src.fedoraproject.org/rpms/libxml++30.git /var/lib/mock/f40-build-785647-134039/root/chroot_tmpdir/scmroot/libxml++30
Cloning into '/var/lib/mock/f40-build-785647-134039/root/chroot_tmpdir/scmroot/libxml++30'...
$ git fetch origin bdbba2c23b3953a542c79b5c274930bc4cecbc1c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxml++30
 * [new ref]         bdbba2c23b3953a542c79b5c274930bc4cecbc1c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bdbba2c Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild