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#!/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> <mlprefix=...> <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;
#  * mlprefix=... - this one is needed in order to have separate hooks for multilib.
#  * 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 3 ] && exit 1

intercept_script=$INTERCEPT_DIR/$1 && shift
package_name=$1 && shift
mlprefix=$(echo $1 |sed -ne "s/^mlprefix=\(.*\)-/\1/p") && shift

# if the hook we want to install does not exist, then there's nothing we can do
[ -f "$intercept_script" ] || exit 1

# if the postinstall wanting to install the hook belongs to a multilib package,
# then we'd better have a separate hook for this because the default ${libdir} and
# ${base_libdir} will point to the wrong locations
if [ -n "$mlprefix" ]; then
	ml_intercept_script=$intercept_script-$mlprefix
	# if the multilib hook does not exist, create it from the default one
	if [ ! -f "$ml_intercept_script" ]; then
		cp $intercept_script $ml_intercept_script

		# clear the ##PKGS: line and the already set variables
		[ -x "$ml_intercept_script" ] && sed -i -e "2,$(($#+1)) {/.*/d}" -e "/^##PKGS: .*/d" $ml_intercept_script
	fi

	intercept_script=$ml_intercept_script
fi

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