#!/bin/bash

# dib-lint: disable=safe_sudo

if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail


[ -n "$TARGET_ROOT" ]

USER=${USER:-$(whoami)}

source $_LIB/img-functions

IMAGE_PATH=$(readlink -f $IMAGE_NAME)
cd $TARGET_ROOT

DIB_IPA_COMPRESS_CMD="${DIB_IPA_COMPRESS_CMD:-gzip}"

echo "#disabled" > ./tmp/fstab.new
sudo mv ./tmp/fstab.new ./etc/fstab
sudo ln -s ./sbin/init ./

# NOTE(TheJulia): Make a random and urandom entry to handle
# long standing systemd bug cases where it may, depending on
# underlying OS config/version, try to open the random number
# generator before initializing.
# This class of issue has appeared frquently with systemd,
# https://github.com/systemd/systemd/issues/4167 is a commonly
# referenced example of this behavior.
if ! [ -a ./dev/random ]; then
    sudo mknod ./dev/random c 1 8
fi
if ! [ -a ./dev/urandom ]; then
    sudo mknod ./dev/urandom c 1 9
fi

# Note(JayF): to anyone trying to make this more configurable in the future,
# there are significant hurdles around shell quoting if you try to put these
# find commands into variables for making them more configurable.
if [ "${DIB_IPA_MINIMAL_PRUNE:-0}" -gt 0 ]; then
    # Operator opted out of full ramdisk pruning; do not proactively remove
    # directories that may be in use by other elements/packages
    sudo find . -xdev \
        -path './sys/*' -prune -o \
        -path './tmp/*' -prune -o \
        -path './boot/*' -prune -o \
        -path './root/.cache' -prune -o \
        -name '*.pyc' -prune -o \
        -name '*.pyo' -prune -o \
        -print | sudo cpio -o -H newc | ${DIB_IPA_COMPRESS_CMD} > ${IMAGE_PATH}.initramfs
else
    # This performs a full prune, leading to the smallest possible ramdisk
    # size. This may break operator-configured packages or elements that
    # depend on pruned paths.
    # Note: The pci.ids, which is used by lshw, are located on Ubuntu
    # in /usr/share/misc. Therefore we are removing only the
    # ./usr/share/misc/m* (will remove the magic and magic.mgc files).
    # on RHEL pci.ids is locate on /usr/share/hwdata/pci.ids.
    sudo find . -xdev \
        -path './sys/*' -prune -o \
        -path './tmp/*' -prune -o \
        -path './boot/*' -prune -o \
        -path './root/.cache' -prune -o \
        -path "*site-packages/babel/locale-data/*" -prune -o \
        -path './usr/include/*' -prune -o \
        -path './usr/lib/locale/*' -prune -o \
        -path './usr/share/doc/*' -prune -o \
        -path './usr/share/man/*' -prune -o \
        -path './usr/share/GeoIP/*' -prune -o \
        -path './usr/share/info/*' -prune -o \
        -path './usr/share/licenses/*' -prune -o \
        -path './usr/share/locale/*' -prune -o \
        -path './usr/share/misc/m*' -prune -o \
        -path './usr/src/kernels/*' -prune -o \
        -path './var/cache/*' -prune -o \
        -path './var/log/*' -prune -o \
        -name '*.pyc' -prune -o \
        -name '*.pyo' -prune -o \
        -print | sudo cpio -o -H newc | ${DIB_IPA_COMPRESS_CMD} > ${IMAGE_PATH}.initramfs
fi

select_boot_kernel_initrd $TARGET_ROOT
sudo cp $BOOTDIR/$KERNEL ${IMAGE_PATH}.kernel
sudo chown $USER: ${IMAGE_PATH}.kernel
if [[ -n "$DIB_CHECKSUM" && "$DIB_CHECKSUM" != "0" ]]; then
    pushd $(dirname ${IMAGE_PATH})
    [[ "$DIB_CHECKSUM" == "1" ]] && DIB_CHECKSUM="md5,sha256"
    [[ "$DIB_CHECKSUM" == *md5* ]] && md5sum ${IMAGE_NAME}.initramfs ${IMAGE_NAME}.kernel > ${IMAGE_NAME}.md5
    [[ "$DIB_CHECKSUM" == *sha256* ]] && sha256sum ${IMAGE_NAME}.initramfs ${IMAGE_NAME}.kernel > ${IMAGE_NAME}.sha256
    popd
fi
# Output image sizes for debugging
sudo ls -lh ${IMAGE_PATH}.*