minimize-initial-snapshot

#!/bin/bash
set -e
set -x
export LC_ALL=C

if [ "$build_dir" = "" ]; then
    build_dir="."
fi
sudo chroot $build_dir/fs/snapshot/0 apt-get clean
sudo rm -f $build_dir/fs/snapshot/0/var/lib/apt/lists/*Packages
sudo rm -fr $build_dir/fs/snapshot/0/var/cache/apt
sudo mkdir $build_dir/fs/snapshot/0/var/cache/apt
sudo rm -fr $build_dir/fs/snapshot/0/usr/share/locale
sudo mkdir $build_dir/fs/snapshot/0/usr/share/locale
sudo rm -fr $build_dir/fs/snapshot/0/usr/share/doc
sudo mkdir $build_dir/fs/snapshot/0/usr/share/doc
sudo rm -fr $build_dir/fs/snapshot/0/usr/share/man/??
sudo rm -fr $build_dir/fs/snapshot/0/usr/share/man/??_*
sudo rm -fr $build_dir/fs/snapshot/0/lib/modules/*/kernel/{sound,drivers/media,drivers/isdn,drivers/video,drivers/gpu}
sudo rm -fr $build_dir/fs/snasphot/0/boot/System.map-*
set +x
for i in \
    fs/xfs/xfs.ko \
    fs/btrfs/btrfs.ko \
    fs/ocfs2/ocfs2.ko \
    drivers/scsi/lpfc/lpfc.ko \
    lib/test_bpf.ko \
    drivers/scsi/qla2xxx/qla2xxx.ko \
    drivers/infiniband/hw/hfi1/hfi1.ko \
    drivers/scsi/bfa/bfa.ko \
    fs/f2fs/f2fs.ko \
    fs/ceph/ceph.ko \
    drivers/block/drbd/drbd.ko \
    fs/ubifs/ubifs.ko \
    net/sctp/sctp.ko \
    drivers/infiniband/hw/qib/ib_qib.ko \
    net/ceph/libceph.ko \
    fs/nilfs2/nilfs2.ko \
    fs/reiserfs/reiserfs.ko \
    drivers/infiniband/hw/cxgb4/iw_cxgb4.ko \
    fs/afs/kafs.ko \
    fs/ocfs2/dlm/ocfs2_dlm.ko \
    fs/dlm/dlm.ko \
    drivers/infiniband/hw/i40iw/i40iw.ko \
    fs/jfs/jfs.ko \
    drivers/mtd/ubi/ubi.ko \
    drivers/infiniband/hw/nes/iw_nes.ko; do
    sudo rm -f $build_dir/fs/snapshot/0/lib/modules/*/kernel/$i
done
(
    for i in $(find $build_dir/fs/snapshot/0/lib/modules -name "*.ko"); do
        if [ "$(file "$i"|grep ELF)" != "" ]; then
            echo "$i"
        fi
    done
) | sudo sh -c 'while read i; do xz -9 $i; mv -i $i.xz $i; done'
sudo chroot $build_dir/fs/snapshot/0 update-initramfs -k all -c -t