Chromium snap install hook to create private, correct /etc/ld.so.cache

install.sh

#!/bin/bash -ex

# make sure our fake ld.so.cache exists
if [ ! -f "$SNAP_DATA/etc/ld.so.cache" ]; then
    echo "snap private ld.so.cache doesn't exist!"
    exit 1
fi

# copying the conf dir from real /etc into $SNAP_DATA
mkdir -p "$SNAP_DATA/etc/ld.so.conf.d"
cp -r /etc/ld.so.conf.d/* "$SNAP_DATA/etc/ld.so.conf.d"
cp /etc/ld.so.conf "$SNAP_DATA/etc/ld.so.conf"

# delete empty entries in the LD_LIBRARY_PATH
# i.e. change "/a/b/c:/1/2/3::/other" into "/a/b/c:/1/2/3:/other"
# if we don't do this, then ldconfig gets confused with "" as arguments of dirs
# to add to the cache
LD_LIBRARY_PATH="${LD_LIBRARY_PATH//::/:}"

# run ldconfig on our LD_LIBRARY_PATH lib dirs
IFS=':' read -ra PATHS <<< "$LD_LIBRARY_PATH"
mkdir -p "$SNAP_DATA/fake-etc"
ldconfig -v -C "$SNAP_DATA/fake-etc/ld.so.cache" -c "$SNAP_DATA/etc/ld.so.conf" "${PATHS[@]}"

# install the new ld.so.cache to the global location by just copying it
cp "$SNAP_DATA/fake-etc/ld.so.cache" "$SNAP_DATA/etc/ld.so.cache"