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tests: add test for modprobe.d blacklist

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -418,6 +418,7 @@

 # optional blacklist

 for i in ${KOPT_blacklist//,/ }; do

+	mkdir -p "$ROOT"/etc/modprobe.d

 	echo "blacklist $i" >> "$ROOT"/etc/modprobe.d/boot-opt-blacklist.conf

 done

--- a/tests/initramfs-init.test

+++ b/tests/initramfs-init.test

@@ -4,6 +4,7 @@

 init_tests \

 	initramfs_init_cmdline_root \

+	initramfs_init_blacklist

 fake_cmdline() {

 	mkdir -p proc

@@ -16,12 +17,17 @@

 	chmod +x bin/"$1"

 }

-initramfs_init_cmdline_root_body() {

-	fake_cmdline "root=/dev/vda1"

+fake_switch_root() {

 	fake_bin switch_root <<-EOF

 		#!/bin/sh

 		echo "switch_root OK"

 	EOF

+}

+

+initramfs_init_cmdline_root_body() {

+	fake_cmdline "root=/dev/vda1"

+	fake_switch_root

+

 	atf_check -o match:"Alpine Init" \

 		-o match:"nlplug-findfs" \

 		-o match:"mount.*-o ro.*/dev/vda1.*/sysroot" \

@@ -28,3 +34,16 @@

 		-o match:"switch_root OK" \

 		initramfs-init

 }

+

+initramfs_init_blacklist_body() {

+	fake_cmdline "root=/dev/vda1 blacklist=dummy,evbug"

+	fake_switch_root

+	atf_check -o match:"switch_root OK" \

+		initramfs-init

+

+	atf_check -o match:"blacklist dummy" \

+		-o match:"blacklist evbug" \

+		cat etc/modprobe.d/*

+}

+

+