abuild: Do not store whitespaces in license field

Currently, abuild stores the license variable ad-verbatim in the PKGINFO
file. This causes many downstream systems to fail. For example, `apk
info` won't show anything after the newline, our webview that lists
licenses do not show these either.

Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>

abuild.in

@@ -1135,7 +1135,7 @@ prepare_metafiles() {
 		echo "provider_priority = $provider_priority" >> "$pkginfo"
 	fi
 
-	echo "license = $license" >> "$pkginfo"
+	echo "license = $(echo $license)" >> "$pkginfo"
 	for i in $replaces; do
 		echo "replaces = $i" >> "$pkginfo"
 	done

tests/abuild.bats

@@ -239,3 +239,9 @@ setup() {
 	! TESTDEPVER="1.0-0" $ABUILD all
 }
 
+@test "abuild: check multi-line licenses" {
+	cd 'testrepo/test-licenses'
+	$ABUILD rootpkg
+	grep '^license = MIT AND GPL-3.0-only OR GPL-3.0-or-later AND BSD-Clause-4$' \
+	     "${APORTSDIR}/test-licenses/pkg/.control.test-licenses/.PKGINFO"
+}

tests/testrepo/test-licenses/APKBUILD

@@ -0,0 +1,31 @@
+# Maintainer: Olliver Schinagl <oliver@schinagl.nl>
+
+# test package
+pkgname="${TESTNAME-test-licenses}"
+pkgver="1.0"
+pkgrel=0
+pkgdesc='Dummy test package that has multi-line licenses'
+url='https://gitlab.alpinelinux.org/alpine/aports'
+arch='noarch'
+license='MIT AND
+         GPL-3.0-only OR  
+  
+ GPL-3.0-or-later AND   
+		 BSD-Clause-4
+'
+
+prepare() {
+	mkdir -p "${builddir}"
+}
+
+build() {
+	touch foo
+}
+
+check() {
+	true
+}
+
+package() {
+	mkdir -p "${pkgdir}"
+}