$ git clone -n https://src.fedoraproject.org/rpms/btrfs-assistant.git /var/lib/mock/f40-build-2431561-60637/root/chroot_tmpdir/scmroot/btrfs-assistant
Cloning into '/var/lib/mock/f40-build-2431561-60637/root/chroot_tmpdir/scmroot/btrfs-assistant'...
$ git fetch origin ce686ffb2ce3ce982bfef54f5d8f04bc07b83006:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/btrfs-assistant
 * [new ref]         ce686ffb2ce3ce982bfef54f5d8f04bc07b83006 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce686ff Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild