kernel: Add update script

1 files changed, 62 insertions, 0 deletions

diff --git a/pkgs/os-specific/linux/kernel/update.sh b/pkgs/os-specific/linux/kernel/update.sh
new file mode 100755
index 000000000000..d9db7f9f916c
--- /dev/null
+++ b/pkgs/os-specific/linux/kernel/update.sh
@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+set -e
+
+# Get the latest versions from kernel.org
+LINUXSED='s/.*linux-\([0-9]\+\(.[0-9]\+\)*\).*/\1/p'
+KDATA="$(curl -s https://www.kernel.org | sed -n -e '/Download complete/p')"
+VERSIONS=($(sed -n -e $LINUXSED <<< "$KDATA" | sort -Vr))
+
+# Remove mainline version if there is a stable update
+# Note due to sorting these two will always exist at the bottom
+if grep -q "^${VERSIONS[1]}" <<< "${VERSIONS[0]}"; then
+  VERSIONS=(${VERSIONS[@]:0:1} ${VERSIONS[@]:2})
+fi
+
+# Inspect each file and see if it has the latest version
+NIXPKGS="$(git rev-parse --show-toplevel)"
+ls $NIXPKGS/pkgs/os-specific/linux/kernel | while read FILE; do
+  KERNEL="$(sed -n $LINUXSED <<< "$FILE")"
+  [ -z "$KERNEL" ] && continue
+
+  # Find the matching new kernel version
+  MATCHING=""
+  for V in "${VERSIONS[@]}"; do
+    if grep -q "^$KERNEL" <<< "$V"; then
+      MATCHING="$V"
+      break
+    fi
+  done
+  if [ -z "$MATCHING" ]; then
+    echo "Out-of-support $KERNEL"
+    continue
+  fi
+
+  # Inspect the nix expression to check for changes
+  DATA="$(<$NIXPKGS/pkgs/os-specific/linux/kernel/$FILE)"
+  URL="$(sed -n -e 's/.*url = "\(.*\)";.*/\1/p' <<< "$DATA" | sed -e "s/\${version}/$MATCHING/g")"
+  OLDVER=$(sed -n -e 's/.*version = "\(.*\)".*/\1/p' <<< "$DATA")
+  if [ "$OLDVER" = "$V" ]; then
+    echo "No updates for $KERNEL"
+    continue
+  fi
+
+  # Download the new file for the hash
+  if ! HASH="$(nix-prefetch-url $URL 2>/dev/null)"; then
+    echo "Failed to get hash of $URL"
+    continue
+  fi
+  sed -i "s/sha256 = \".*\"/sha256 = \"$HASH\"/g" $NIXPKGS/pkgs/os-specific/linux/kernel/$FILE
+
+  # Rewrite the expression
+  sed -i -e '/version = /d' -e '/modDirVersion = /d' $NIXPKGS/pkgs/os-specific/linux/kernel/$FILE
+  if grep -q '^[0-9]\+.[0-9]\+$' <<< "$V"; then
+    sed -i "\#import ./generic.nix (args // rec {#a \  modDirVersion = \"${V}.0\";" $NIXPKGS/pkgs/os-specific/linux/kernel/$FILE
+  fi
+  sed -i "\#import ./generic.nix (args // rec {#a \  version = \"$V\";" $NIXPKGS/pkgs/os-specific/linux/kernel/$FILE
+
+  # Commit the changes
+  git add -u $NIXPKGS/pkgs/os-specific/linux/kernel/$FILE
+  git commit -m "kernel: $OLDVER -> $V" >/dev/null 2>&1
+  
+  echo "Updated $OLDVER -> $V"
+done