$ git clone -n https://src.fedoraproject.org/rpms/mp3gain.git /var/lib/mock/f40-build-2011969-45758/root/chroot_tmpdir/scmroot/mp3gain
Cloning into '/var/lib/mock/f40-build-2011969-45758/root/chroot_tmpdir/scmroot/mp3gain'...
$ git fetch origin b79e50761cd1dc187135d691006b91a16fcbdd8d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mp3gain
 * [new ref]         b79e50761cd1dc187135d691006b91a16fcbdd8d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b79e507 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild