From 1f1cf718067a73aedcdc2b605ac7512f9474e846 Mon Sep 17 00:00:00 2001
From: Francois Dupoux <2386566-fdupoux@users.noreply.gitlab.com>
Date: Wed, 19 Jan 2022 07:59:37 +0000
Subject: [PATCH] Recompress kernel modules to save disk space (#247)

---
 ChangeLog | 1 +
 build.sh  | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index f5377fa..d795360 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,7 @@ SystemRescue ChangeLog
 9.01 (YYYY-MM-DD):
 -------------------------------------------------------------------------------
 * Support for adding Certification Authorities (CAs) via YAML config (Gerd v. Egidy)
+* Recompress kernel modules using xz to reduce the size of the ISO image (#247)
 
 -------------------------------------------------------------------------------
 9.00 (2022-01-16):
diff --git a/build.sh b/build.sh
index 0ebb538..16c53f1 100755
--- a/build.sh
+++ b/build.sh
@@ -223,6 +223,13 @@ make_customize_airootfs() {
 
     # strip large binaries
     find ${work_dir}/${arch}/airootfs/usr/lib -type f -name "lib*.so.*" -exec strip --strip-all {} \;
+
+    # recompress kernel modules to save space (#247)
+    echo "Recompressing kernel modules ..."
+    kernelver=$(basename ${work_dir}/${arch}/airootfs/usr/lib/modules/*)
+    find ${work_dir}/${arch}/airootfs/usr/lib/modules/${kernelver} -type f -name "*.ko.zst" -exec zstd -q -d --rm {} \;
+    find ${work_dir}/${arch}/airootfs/usr/lib/modules/${kernelver} -type f -name "*.ko" -exec xz {} \;
+    depmod --all --basedir=${work_dir}/${arch}/airootfs/usr ${kernelver}
 }
 
 # Copy mkinitcpio archiso hooks and build initramfs (airootfs)