$ git clone -n https://src.fedoraproject.org/rpms/btrfs-progs.git /var/lib/mock/f40-build-2274843-55035/root/chroot_tmpdir/scmroot/btrfs-progs
Cloning into '/var/lib/mock/f40-build-2274843-55035/root/chroot_tmpdir/scmroot/btrfs-progs'...
$ git fetch origin 9b441db3401dc56988111d0e2b4be5548fa9b618:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/btrfs-progs
 * [new ref]         9b441db3401dc56988111d0e2b4be5548fa9b618 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b441db Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild