makepkg: skip integrity checking early

If "SKIP" is provided for an integrity check, abort checking as soon
as possible.

Also swap fork to tr for bash4 conversion.

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

scripts/makepkg.sh.in

@@ -737,6 +737,12 @@ check_checksums() {
 				file="$(get_filename "$file")"
 				printf "%s" "    $file ... " >&2
 
+				if [[ ${integrity_sums[$idx]} = 'SKIP' ]]; then
+					echo "$(gettext "Skipped")" >&2
+					idx=$((idx + 1))
+					continue
+				fi
+
 				if ! file="$(get_filepath "$file")"; then
 					printf -- "$(gettext "NOT FOUND")\n" >&2
 					errors=1
@@ -744,18 +750,14 @@ check_checksums() {
 				fi
 
 				if (( $found )) ; then
-					if [[ ${integrity_sums[$idx]} = 'SKIP' ]]; then
-						echo "$(gettext "Skipped")" >&2
+					local expectedsum="${integrity_sums[idx],,}"
+					local realsum="$(openssl dgst -${integ} "$file")"
+					realsum="${realsum##* }"
+					if [[ $expectedsum = "$realsum" ]]; then
+						printf -- "$(gettext "Passed")\n" >&2
 					else
-						local expectedsum=$(tr '[:upper:]' '[:lower:]' <<< "${integrity_sums[$idx]}")
-						local realsum="$(openssl dgst -${integ} "$file")"
-						realsum="${realsum##* }"
-						if [[ $expectedsum = "$realsum" ]]; then
-							printf -- "$(gettext "Passed")\n" >&2
-						else
-							printf -- "$(gettext "FAILED")\n" >&2
-							errors=1
-						fi
+						printf -- "$(gettext "FAILED")\n" >&2
+						errors=1
 					fi
 				fi