Official Debian support! - Printable Version

Code:
#!/bin/sh



# This script installs RockPro64 devicetree files into /boot when new kernels

# are installed, removes them when kernels are removed, and updates the

# "dtbs" and "dtbs.old" symlinks accordingly.

# It should be copied into /etc/kernel/postinst.d/ and /etc/kernel/postrm.d/

# and given execute permission.

# https://www.debian.org/doc/manuals/debian-kernel-handbook/ch-update-hooks.html



set -e

exec </dev/null >&2  # Don't use stdin or stdout



version="$1"

pkgname=${DPKG_MAINTSCRIPT_PACKAGE:-kernel package}

if [ -z "$version" ]; then

    echo "W: $pkgname did not pass a version number; exiting."

    exit 0

fi



eval set -- "$DEB_MAINT_PARAMS"

action="$1"





# return 0 if $1 matches any of the remaining args

among() {

    val="$1"

    shift

    for a in "$@"; do

        if [ "$val" = "$a" ]; then return 0; fi

    done

    return 1;

}



# update /boot/dtbs and /boot/dtbs.old

# expects $1 to be "configure" or "remove"

# expects $version to be set

# see also: linux-update-symlinks

update_symlinks() {

    # build a list of dtbs-<ver> symlink targets, highest priority first...



    # ...first priority is a newly installed kernel

    if [ "$action" = configure ]; then

        set -- "dtbs-$version"

    else

        set --

    fi



    if [ "$action" = remove ]; then

        rmtarget=dtbs-$version

    fi



    # ...next priority is the existing primary symlink (if not being removed)

    link1=/boot/dtbs

    target1="$(readlink "$link1" || true)"

    if [ -e "$link1" ] && ! among "$target1" "$@"; then

        if [ "$target1" != "$rmtarget" ]; then

            set -- "$@" "$target1"

        fi

    fi



    # ...next priority is the existing secondary symlink (if not being removed)

    link2=/boot/dtbs.old

    target2="$(readlink "$link2" || true)"

    if [ -e "$link2" ] && ! among "$target2" "$@"; then

        if [ "$target2" != "$rmtarget" ]; then

            set -- "$@" "$target2"

        fi

    fi



    # ...finally, any other installed kernels, newest first

    for v in $(linux-version list | linux-version sort --reverse); do

        if [ "$action" = remove ] && [ "$v" = "$version" ]; then

            continue;

        fi

        if ! among "dtbs-$v" "$@"; then

            set -- "$@" "dtbs-$v"

        fi

    done



    # create/replace/remove the primary and secondary symlinks



    if [ $# -ge 1 ]; then

        echo "I: creating symlink $link1 -> $1"

        ln -sfn "$1" "$link1"

    elif [ -L "$link1" ]; then

        echo "I: removing $link1"

        rm -f "$link1"

    fi



    if [ $# -ge 2 ]; then shift; fi

    if [ $# -ge 1 ]; then

        echo "I: creating symlink $link2 -> $1"

        ln -sfn "$1" "$link2"

    elif [ -L "$link2" ]; then

        echo "I: removing $link2"

        rm -f "$link2"

    fi



    if [ ! -e "$link1" ]; then

        echo "W: $link1 symlink is missing; unable to find a target for it"

    fi

}





srcdir=/usr/lib/linux-image-${version}/rockchip

destbase=dtbs-${version}

destdir=/boot/$destbase/rockchip

fname=rk3399-rockpro64-v2.dtb



if [ "$action" = configure ]; then



    if [ -f "$srcdir/$fname" ]; then

        echo "I: installing $destdir/$fname"

        mkdir -p "$destdir"

        cp "$srcdir/$fname" "$destdir/$fname"

    else

        echo "W: $pkgname doesn't contain $srcdir/$fname; making symlink anyway"

    fi



    update_symlinks "$action"



fi



if [ "$action" = remove ]; then



    update_symlinks "$action"



    if [ -f "$destdir/$fname" ]; then

        echo "I: removing $destdir/$fname"

        rm "$destdir/$fname"

        rmdir "$destdir" || true

        rmdir "/boot/$destbase" || true

    fi

fi