$ git clone -n https://src.fedoraproject.org/rpms/xfce4-mpc-plugin.git /var/lib/mock/f39-build-1577171-37956/root/chroot_tmpdir/scmroot/xfce4-mpc-plugin
Cloning into '/var/lib/mock/f39-build-1577171-37956/root/chroot_tmpdir/scmroot/xfce4-mpc-plugin'...
$ git fetch origin 6aab0bb7e9bb00d8d6fbc5a6c066a1b4c43a82cd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfce4-mpc-plugin
 * [new ref]         6aab0bb7e9bb00d8d6fbc5a6c066a1b4c43a82cd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6aab0bb Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild