xref: /openbmc/openbmc/poky/scripts/postinst-intercepts/postinst_intercept (revision c124f4f2e04dca16a428a76c89677328bc7bf908)
1#!/bin/sh
2#
3# SPDX-License-Identifier: MIT
4#
5# This script is called from inside postinstall scriptlets at do_rootfs time. It
6# actually adds, at the end, the list of packages for which the intercept script
7# is valid. Also, if one wants to pass any variables to the intercept script from
8# the postinstall itself, they will be added immediately after the shebang line.
9#
10# Usage: postinst_intercept <intercept_script_name> <package_name> <mlprefix=...> <var1=...> ... <varN=...>
11#  * intercept_script_name - the name of the intercept script we want to change;
12#  * package_name - add the package_name to list of packages the intercept script
13#                   is used for;
14#  * mlprefix=... - this one is needed in order to have separate hooks for multilib.
15#  * var1=... - var1 will have the value we provide in the intercept script. This
16#               is useful when we want to pass on variables like ${libdir} to
17#               the intercept script;
18#
19[ $# -lt 3 ] && exit 1
20
21intercept_script=$INTERCEPT_DIR/$1 && shift
22package_name=$1 && shift
23mlprefix=$(echo $1 |sed -ne "s/^mlprefix=\(.*\)-/\1/p") && shift
24
25# if the hook we want to install does not exist, then there's nothing we can do
26[ -f "$intercept_script" ] || exit 1
27
28# if the postinstall wanting to install the hook belongs to a multilib package,
29# then we'd better have a separate hook for this because the default ${libdir} and
30# ${base_libdir} will point to the wrong locations
31if [ -n "$mlprefix" ]; then
32	ml_intercept_script=$intercept_script-$mlprefix
33	# if the multilib hook does not exist, create it from the default one
34	if [ ! -f "$ml_intercept_script" ]; then
35		cp $intercept_script $ml_intercept_script
36
37		# clear the ##PKGS: line and the already set variables
38		[ -x "$ml_intercept_script" ] && sed -i -e "2,$(($#+1)) {/.*/d}" -e "/^##PKGS: .*/d" $ml_intercept_script
39	fi
40
41	intercept_script=$ml_intercept_script
42fi
43
44chmod +x "$intercept_script"
45
46pkgs_line=$(grep "##PKGS:" $intercept_script)
47if [ -n "$pkgs_line" ]; then
48	# line exists, add this package to the list only if it's not already there
49	if [ -z "$(echo "$pkgs_line" | grep " $package_name ")" ]; then
50		sed -i -e "s/##PKGS:.*/\0${package_name} /" $intercept_script
51	fi
52else
53	for var in "$@"; do
54		sed -i -e "\%^#\!/bin/.*sh%a $var" $intercept_script
55	done
56	echo "##PKGS: ${package_name} " >> $intercept_script
57fi
58
59