From bd9279f96d0a7c9ad02c06e83c85db31ab2767d2 Mon Sep 17 00:00:00 2001
From: Michael Chus <mike@mchus.pro>
Date: Thu, 5 Mar 2026 16:23:55 +0300
Subject: [PATCH] perf: use lz4 compression for modloop squashfs
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xz → lz4 for mksquashfs: kernel modloop rebuild is ~10x faster.
Size increase is acceptable since modloop is loaded into RAM.
Applied in both setup-builder.sh and build-debug.sh.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 iso/builder/build-debug.sh   | 5 +++++
 iso/builder/setup-builder.sh | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/iso/builder/build-debug.sh b/iso/builder/build-debug.sh
index bfbc0b6..340788d 100644
--- a/iso/builder/build-debug.sh
+++ b/iso/builder/build-debug.sh
@@ -28,6 +28,11 @@ done
 . "${BUILDER_DIR}/VERSIONS"
 export PATH="$PATH:/usr/local/go/bin"
 
+# Use lz4 for mksquashfs — much faster than xz, size difference is negligible for RAM-loaded modloop.
+mkdir -p /etc/mkinitfs
+grep -q 'MKSQUASHFS_OPTS' /etc/mkinitfs/mkinitfs.conf 2>/dev/null || \
+    echo 'MKSQUASHFS_OPTS="-comp lz4 -Xhc"' >> /etc/mkinitfs/mkinitfs.conf
+
 echo "=== bee debug ISO build ==="
 echo "Alpine: ${ALPINE_VERSION}, Go: ${GO_VERSION}"
 echo ""
diff --git a/iso/builder/setup-builder.sh b/iso/builder/setup-builder.sh
index 783ebe8..e1d9565 100644
--- a/iso/builder/setup-builder.sh
+++ b/iso/builder/setup-builder.sh
@@ -122,6 +122,11 @@ if [ ! -f "${HOME}/.abuild/abuild.conf" ]; then
     fi
 fi
 
+# --- mkinitfs: use lz4 compression for faster modloop builds ---
+mkdir -p /etc/mkinitfs
+grep -q 'MKSQUASHFS_OPTS' /etc/mkinitfs/mkinitfs.conf 2>/dev/null || \
+    echo 'MKSQUASHFS_OPTS="-comp lz4 -Xhc"' >> /etc/mkinitfs/mkinitfs.conf
+
 echo ""
 echo "=== builder setup complete ==="
 echo "Next: sh iso/builder/build-debug.sh"