$ git clone -n https://src.fedoraproject.org/rpms/prooftree.git /var/lib/mock/f39-build-1506129-35171/root/chroot_tmpdir/scmroot/prooftree
Cloning into '/var/lib/mock/f39-build-1506129-35171/root/chroot_tmpdir/scmroot/prooftree'...
$ git fetch origin bb973cad35c27269c4e5316279b1c17e1fceb6ee:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/prooftree
 * [new ref]         bb973cad35c27269c4e5316279b1c17e1fceb6ee -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb973ca Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild