Add PGPSIG field in repo-add

Use base64 encoding to store the value in the database if a .sig file exists
for the package being added.

Signed-off-by: Geoffroy Carrier <geoffroy.carrier@koon.fr>
Signed-off-by: Dan McGee <dan@archlinux.org>

scripts/repo-add.sh.in

@@ -268,6 +268,12 @@ db_write_entry()
 	msg2 "$(gettext "Computing md5 checksums...")"
 	echo -e "%MD5SUM%\n$md5sum\n" >>desc
 
+	# add base64'd PGP signature
+	if [[ -f $startdir/$pkgfile.sig ]]; then
+		pgpsig=$(openssl base64 -in "$startdir/$pkgfile.sig" | tr -d '\n')
+		echo -e "%PGPSIG%\n$pgpsig\n" >>desc
+	fi
+
 	[[ -n $url ]] && echo -e "%URL%\n$url\n" >>desc
 	write_list_entry "LICENSE" "$_licenses" "desc"
 	[[ -n $arch ]] && echo -e "%ARCH%\n$arch\n" >>desc