Add zstd compression support for squashfs modules

This will provide compression ratios approaching those of xz,
while achieving decompression rations similar to lzo (5 times faster
than xz).

We will need to have a zstd package in Slackware first, and then
rebuild squashfs-tools to add zstd support.

1 files changed, 4 insertions, 3 deletions

diff --git a/makemod b/makemod
index ae030c9..38a5566 100755
--- a/makemod
+++ b/makemod
@@ -62,9 +62,10 @@ fi
 
 MODEXT=$(echo "$2" |rev |cut -d'.' -f1 |rev)
 case $MODEXT in
-  sxz) COMPR="xz" ;;
-  sgz) COMPR="gzip" ;;
-  xzm) COMPR="xz" ;;
+  sxz) COMPR=${COMPR:-"xz"} ;;
+  sgz) COMPR=${COMPR:-"gzip"} ;;
+  szs) COMPR=${COMPR:-"zstd"} ;;
+  xzm) COMPR=${COMPR:-"xz"} ;;  # Porteus module extension and compressor
     *) echo "-- Unsupported module extension '$MODEXT'" ; exit 1 ;;
 esac