Snapcraft ld.so.cache generation example

hook.sh

#!/bin/sh

set -e

mkdir -p $SNAP_DATA/etc

snap_ld_so_conf=$SNAP_DATA/etc/snap-ld.so.conf
snap_ld_so_cache=$SNAP_DATA/etc/snap-ld.so.cache
real_ld_so_cache=$SNAP_DATA/etc/ld.so.cache

RUNTIME=$SNAP/gnome-platform

cat > "$snap_ld_so_conf" <<EOF
/var/lib/snapd/lib/gl
/var/lib/snapd/lib/gl32
$SNAP/lib/x86_64-linux-gnu
$SNAP/lib/i386-linux-gnu
$SNAP/lib
$SNAP/usr/lib/x86_64-linux-gnu
$SNAP/usr/lib/i386-linux-gnu
$SNAP/usr/lib
$SNAP/usr/lib/x86_64-linux-gnu/dri
$SNAP/usr/lib/i386-linux-gnu/dri
$RUNTIME/lib/x86_64-linux-gnu
$RUNTIME/lib/i386-linux-gnu
$RUNTIME/lib
$RUNTIME/usr/lib/x86_64-linux-gnu
$RUNTIME/usr/lib/i386-linux-gnu
$RUNTIME/usr/lib
$RUNTIME/usr/lib/x86_64-linux-gnu/dri
$RUNTIME/usr/lib/i386-linux-gnu/dri
/lib/x86_64-linux-gnu
/lib/i386-linux-gnu
/usr/lib/x86_64-linux-gnu
/usr/lib/i386-linux-gnu
EOF

ldconfig -X -f $snap_ld_so_conf -C $snap_ld_so_cache

# We need to update the real ld.so.cache in place rather than moving
# over the top of it, since it is the source of a bind mount.
cat $snap_ld_so_cache > $real_ld_so_cache

run.sh

#!/bin/sh
exec "$@"

snapcraft.yaml

name: ld-so-cache-experiment
base: core20
version: '0.1'
summary: ld.so.cache experiment
description: |
  This is my-snap's description. You have a paragraph or two to tell the
  most important story about your snap. Keep it under 100 words though,
  we live in tweetspace and your description wants to look good in the snap
  store.

grade: devel
confinement: strict

layout:
  /etc/ld.so.cache:
    bind-file: $SNAP_DATA/etc/ld.so.cache

plugs:
  desktop:
    mount-host-font-cache: false
  opengl:
  gnome-3-38-2004:
    interface: content
    target: $SNAP/gnome-platform
    default-provider: gnome-3-38-2004

apps:
  shell:
    command: bin/run.sh /bin/bash

parts:
  my-part:
    plugin: nil
    source: .
    override-build: |
      mkdir $SNAPCRAFT_PART_INSTALL/gnome-platform
      mkdir $SNAPCRAFT_PART_INSTALL/bin
      cp *.sh $SNAPCRAFT_PART_INSTALL/bin
      mkdir -p $SNAPCRAFT_PART_INSTALL/snap/hooks
      ln -s ../../bin/hook.sh $SNAPCRAFT_PART_INSTALL/snap/hooks/post-refresh
      ln -s ../../bin/hook.sh $SNAPCRAFT_PART_INSTALL/snap/hooks/connect-plug-gnome-3-38-2004
      ln -s ../../bin/hook.sh $SNAPCRAFT_PART_INSTALL/snap/hooks/disconnect-plug-gnome-3-38-2004