$ git clone -n https://src.fedoraproject.org/rpms/btrfs-assistant.git /var/lib/mock/f40-build-2274826-55032/root/chroot_tmpdir/scmroot/btrfs-assistant
Cloning into '/var/lib/mock/f40-build-2274826-55032/root/chroot_tmpdir/scmroot/btrfs-assistant'...
$ git fetch origin 6870f6f21d8282a2049ef17f036b0abf65968c08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/btrfs-assistant
 * [new ref]         6870f6f21d8282a2049ef17f036b0abf65968c08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6870f6f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild