makepkg: properly correlate checksums for multiple sources

Previously, we used a single boolean value to determine correlation of
sources to checksums. Since the introduction of arch-specific sources,
this is no longer sufficient, as we must ensure that we have checksums
for (potentially) multiple source arrays.

This change inlines the logic of have_sources to build an associative
array of source array names, unsetting them as we discover their
checksums. The error condition then becomes a non-empty correlation
array.

Fixes: https://bugs.archlinux.org/task/43192

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

scripts/makepkg.sh.in

@@ -1317,47 +1317,41 @@ verify_integrity_sums() {
 	fi
 }
 
-have_sources() {
-	local a
-
-	(( ${#source[*]} )) && return 0
+check_checksums() {
+	local integ a
+	declare -A correlation
+	(( SKIPCHECKSUMS )) && return 0
 
+	# Initialize a map which we'll use to verify that every source array has at
+	# least some kind of checksum array associated with it.
+	(( ${#source[*]} )) && correlation['source']=1
 	case $1 in
 		all)
 			for a in "${arch[@]}"; do
-				array_build _ source_"$a" && return 0
+				array_build _ source_"$a" && correlation["source_$a"]=1
 			done
 			;;
 		*)
-			array_build _ source_"$CARCH" && return 0
+			array_build _ source_"$CARCH" && correlation["source_$CARCH"]=1
 			;;
 	esac
 
-	return 1
-}
-
-check_checksums() {
-	(( SKIPCHECKSUMS )) && return 0
-	have_sources "$1" || return 0
-
-	local correlation=0
-	local integ a
 	for integ in "${known_hash_algos[@]}"; do
-		verify_integrity_sums "$integ" && correlation=1
+		verify_integrity_sums "$integ" && unset "correlation[source]"
 
 		case $1 in
 			all)
 				for a in "${arch[@]}"; do
-					verify_integrity_sums "$integ" "$a" && correlation=1
+					verify_integrity_sums "$integ" "$a" && unset "correlation[source_$a]"
 				done
 				;;
 			*)
-				verify_integrity_sums "$integ" "$CARCH" && correlation=1
+				verify_integrity_sums "$integ" "$CARCH" && unset "correlation[source_$CARCH]"
 				;;
 		esac
 	done
 
-	if (( ! correlation )); then
+	if (( ${#correlation[*]} )); then
 		error "$(gettext "Integrity checks are missing.")"
 		exit 1 # TODO: error code
 	fi