#!/bin/sh
#
# This script is called from inside postinstall scriptlets at do_rootfs time. It
# actually adds, at the end, the list of packages for which the intercept script
# is valid. Also, if one wants to pass any variables to the intercept script from
# the postinstall itself, they will be added immediately after the shebang line.
#
# Usage: postinst_intercept <intercept_script_name> <package_name> <var1=...> ... <varN=...>
#  * intercept_script_name - the name of the intercept script we want to change;
#  * package_name - add the package_name to list of packages the intercept script
#                   is used for;
#  * var1=... - var1 will have the value we provide in the intercept script. This
#               is useful when we want to pass on variables like ${libdir} to
#               the intercept script;
#
[ $# -lt 2 ] && exit 1

intercept_script=$INTERCEPT_DIR/$1 && shift
package_name=$1 && shift

[ -f "$intercept_script" ] || exit 1

chmod +x "$intercept_script"

pkgs_line="$(cat $intercept_script|grep "##PKGS:")"
if [ -n "$pkgs_line" ]; then
	# line exists, add this package to the list only if it's not already there
	if [ -z "$(echo "$pkgs_line" | grep " $package_name ")" ]; then
		sed -i -e "s/##PKGS:.*/\0${package_name} /" $intercept_script
	fi
else
	for var in $@; do
		sed -i -e "\%^#\!/bin/.*sh%a $var" $intercept_script
	done
	echo "##PKGS: ${package_name} " >> $intercept_script
fi