libmakepkg: Implement extendable signature verification

Lookup the existence of matching functions for each protocol, and
fallback on the generic file handler. New verification protocols can
then be added via thirdparty libmakepkg drop-ins without requiring
modifications to verify_signature.sh

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

1 files changed, 4 insertions, 3 deletions

diff --git a/scripts/libmakepkg/integrity/verify_signature.sh.in b/scripts/libmakepkg/integrity/verify_signature.sh.in
index 9742bdf2..4037f562 100644
--- a/scripts/libmakepkg/integrity/verify_signature.sh.in
+++ b/scripts/libmakepkg/integrity/verify_signature.sh.in
@@ -49,8 +49,8 @@ check_pgpsigs() {
 	for netfile in "${all_sources[@]}"; do
 		proto="$(get_protocol "$netfile")"
 
-		if [[ $proto = git ]]; then
-			verify_git_signature "$netfile" "$statusfile" || continue
+		if declare -f verify_${proto}_signature > /dev/null; then
+			verify_${proto}_signature "$netfile" "$statusfile" || continue
 		else
 			verify_file_signature "$netfile" "$statusfile" || continue
 		fi
@@ -263,7 +263,8 @@ source_has_signatures() {
 		proto="$(get_protocol "$netfile")"
 		query=$(get_uri_query "$netfile")
 
-		if [[ ${netfile%%::*} = *.@(sig?(n)|asc) || ( $proto = git && $query = signed ) ]]; then
+		if [[ ${netfile%%::*} = *.@(sig?(n)|asc) ]] || \
+				( declare -f verify_${proto}_signature > /dev/null && [[ $query = signed ]] ); then
 			return 0
 		fi
 	done