libmakepkg: lint disallowed variables in package()

makepkg will now error if disallowed variables are set inside of
the package function.

Disallowed variables are variables that do exist, like 'makedepends'
and 'pkgver' but can not be set inside of a package function.

Signed-off-by: morganamilo <morganamilo@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/scripts/libmakepkg/util/pkgbuild.sh.in b/scripts/libmakepkg/util/pkgbuild.sh.in
index 0dc239d1..298275a8 100644
--- a/scripts/libmakepkg/util/pkgbuild.sh.in
+++ b/scripts/libmakepkg/util/pkgbuild.sh.in
@@ -100,6 +100,15 @@ extract_function_variable() {
 	return $r
 }
 
+exists_function_variable() {
+	# $1: function name
+	# $2: variable name
+
+	local funcname=$1 attr=$2 out
+	extract_function_variable "$funcname" "$attr" 0 out ||
+		extract_function_variable "$funcname" "$attr" 1 out
+}
+
 get_pkgbuild_attribute() {
 	# $1: package name
 	# $2: attribute name