From 66c94cd0ede3f2770ad9da53b716417310e1c315 Mon Sep 17 00:00:00 2001
From: Copilot <198982749+Copilot@users.noreply.github.com>
Date: Fri, 5 Jun 2026 11:03:51 +0800
Subject: [PATCH] Cache kernel source tarball in /usr/src/ to skip redundant
 downloads (#4)

* Initial plan

* Cache kernel source tarball in /usr/src/ to skip re-downloads

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
---
 dkms-kernel-source.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dkms-kernel-source.sh b/dkms-kernel-source.sh
index 9fdcec4..ed9eb53 100755
--- a/dkms-kernel-source.sh
+++ b/dkms-kernel-source.sh
@@ -18,7 +18,14 @@ if (( patch != 0 )); then
 else
   kernelprefix="linux-$major.$minor"
 fi
-wget --no-check-certificate https://mirrors.edge.kernel.org/pub/linux/kernel/v$major.x/$kernelprefix.tar.xz -O $kernelprefix.tar.xz
+
+if [[ -f "/usr/src/$kernelprefix.tar.xz" ]]; then
+  echo "File /usr/src/$kernelprefix.tar.xz already exists, skipping download."
+else
+  wget --no-check-certificate https://mirrors.edge.kernel.org/pub/linux/kernel/v$major.x/$kernelprefix.tar.xz -O /usr/src/$kernelprefix.tar.xz
+fi
+
+cp /usr/src/$kernelprefix.tar.xz $kernelprefix.tar.xz
 
 for arg in "$@"; do
     echo "Extracting: $kernelprefix/$arg"