nuageinit: add decode_base64 tests

libexec/nuageinit/tests/Makefile

@@ -18,5 +18,6 @@ ${PACKAGE}FILES+=	sethostname.lua
 ${PACKAGE}FILES+=	settimezone.lua
 ${PACKAGE}FILES+=	warn.lua
 ${PACKAGE}FILES+=	addfile.lua
+${PACKAGE}FILES+=	decode_base64.lua
 
 .include <bsd.test.mk>

libexec/nuageinit/tests/decode_base64.lua

@@ -0,0 +1,61 @@
+#!/usr/libexec/flua
+---
+-- SPDX-License-Identifier: BSD-2-Clause
+--
+-- Copyright (c) 2026 Baptiste Daroussin <bapt@FreeBSD.org>
+
+local n = require("nuage")
+
+-- decode_base64 is not exported, test via addfile
+
+local function test_decode(input, expected)
+	local r, err = n.addfile({
+		content = input,
+		encoding = "base64",
+		path = "/tmp/nuage_test_b64"
+	}, false)
+	if not r then
+		n.err(err)
+	end
+	local root = os.getenv("NUAGE_FAKE_ROOTDIR")
+	if not root then
+		root = ""
+	end
+	local f = assert(io.open(root .. "/tmp/nuage_test_b64", "r"))
+	local str = f:read("*all")
+	f:close()
+	if str ~= expected then
+		n.err("base64 decode failed: expected '" .. expected
+			.. "' got '" .. str .. "'")
+	end
+end
+
+-- empty input
+test_decode("", "")
+
+-- single byte: 'a'
+test_decode("YQ==", "a")
+
+-- two bytes: 'ab'
+test_decode("YWI=", "ab")
+
+-- three bytes: 'abc'
+test_decode("YWJj", "abc")
+
+-- newline in base64
+test_decode("YmxhCg==", "bla\n")
+
+-- spaces should be ignored
+test_decode("Y Q = =", "a")
+
+-- b64 alias
+local r, err = n.addfile({
+	content = "YQ==",
+	encoding = "b64",
+	path = "/tmp/nuage_test_b64_b64"
+}, false)
+if not r then
+	n.err("b64 encoding alias should work: " .. tostring(err))
+end
+
+os.exit(0)

libexec/nuageinit/tests/nuage.sh

@@ -14,6 +14,7 @@ atf_test_case adduser
 atf_test_case adduser_passwd
 atf_test_case addgroup
 atf_test_case addfile
+atf_test_case decode_base64
 
 settimezone_body()
 {
@@ -90,6 +91,12 @@ addfile_body()
 	atf_check /usr/libexec/flua $(atf_get_srcdir)/addfile.lua
 }
 
+decode_base64_body()
+{
+	mkdir tmp
+	atf_check /usr/libexec/flua $(atf_get_srcdir)/decode_base64.lua
+}
+
 atf_init_test_cases()
 {
 	atf_add_test_case sethostname
@@ -98,4 +105,5 @@ atf_init_test_cases()
 	atf_add_test_case adduser_passwd
 	atf_add_test_case addgroup
 	atf_add_test_case addfile
+	atf_add_test_case decode_base64
 }