$ git clone -n https://src.fedoraproject.org/rpms/libmatchbox.git /var/lib/mock/f42-build-side-1-3588829-46950/root/chroot_tmpdir/scmroot/libmatchbox
Cloning into '/var/lib/mock/f42-build-side-1-3588829-46950/root/chroot_tmpdir/scmroot/libmatchbox'...
$ git fetch origin 1939d05d561e3b0f362e5fd18b6d0e6030d92ffd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmatchbox
 * [new ref]         1939d05d561e3b0f362e5fd18b6d0e6030d92ffd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1939d05 Rebuilt for https://fedoraproject.org/wiki/Fedora_42_Mass_Rebuild