$ git clone -n https://src.fedoraproject.org/rpms/volume_key.git /var/lib/mock/f39-build-1576167-37942/root/chroot_tmpdir/scmroot/volume_key
Cloning into '/var/lib/mock/f39-build-1576167-37942/root/chroot_tmpdir/scmroot/volume_key'...
$ git fetch origin dbc3ddc9fb1aa7fbe879c730406eaa4b740bcefd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/volume_key
 * [new ref]         dbc3ddc9fb1aa7fbe879c730406eaa4b740bcefd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dbc3ddc Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild