$ git clone -n https://src.fedoraproject.org/rpms/python-btrfs.git /var/lib/mock/f39-build-1549345-36899/root/chroot_tmpdir/scmroot/python-btrfs
Cloning into '/var/lib/mock/f39-build-1549345-36899/root/chroot_tmpdir/scmroot/python-btrfs'...
$ git fetch origin 6be88c0156dd81af8dbbf9e312d529ed55bc7026:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-btrfs
 * [new ref]         6be88c0156dd81af8dbbf9e312d529ed55bc7026 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6be88c0 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild