Initial commit

docker/kernel-builder-arch/Dockerfile

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+FROM archlinux:latest
+
+# Only packaging tools needed — kernel is already compiled
+RUN pacman -Syu --noconfirm && pacman -S --noconfirm \
+    zstd libarchive && \
+    pacman -Scc --noconfirm
+
+WORKDIR /out/staging
+
+# Pre-built artifacts are bind-mounted at /out/staging
+# Output packages go to /out
+
+COPY docker/kernel-builder-arch/build.sh /build.sh
+RUN chmod +x /build.sh
+
+CMD ["/build.sh"]

docker/kernel-builder-arch/build.sh

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+#!/bin/bash
+# Packages pre-built kernel artifacts as a pacman .pkg.tar.zst.
+# Runs inside Docker as root; packages manually (makepkg refuses root).
+# Expects build artifacts staged in /out/staging by the ubuntu build step.
+set -e
+
+if [ ! -f /out/staging/boot/bzImage ]; then
+    echo "Error: no staged artifacts in /out/staging — run the kernel build step first"
+    exit 1
+fi
+
+# Determine version from staged modules directory
+KVER=$(ls /out/staging/lib/modules/)
+PKGNAME="linux-custom"
+VERSION=${KVER%%-*}
+
+echo "==> Packaging kernel $KVER as pacman package"
+
+STAGING=$(mktemp -d)
+
+# Copy staged boot artifacts
+mkdir -p "$STAGING/boot"
+cp /out/staging/boot/bzImage "$STAGING/boot/vmlinuz-$KVER"
+cp /out/staging/System.map   "$STAGING/boot/System.map-$KVER"
+cp /out/staging/.config      "$STAGING/boot/config-$KVER"
+
+# Copy pre-installed modules (Arch uses /lib -> /usr/lib)
+mkdir -p "$STAGING/usr/lib/modules"
+cp -a "/out/staging/lib/modules/$KVER" "$STAGING/usr/lib/modules/"
+
+# Create .PKGINFO
+BUILDDATE=$(date -u +%s)
+INSTALLED_SIZE=$(du -sb "$STAGING" | awk '{print $1}')
+cat > "$STAGING/.PKGINFO" << EOF
+pkgname = $PKGNAME
+pkgbase = $PKGNAME
+pkgver = ${VERSION}-1
+pkgdesc = Custom Linux kernel $KVER for PS5
+url = https://kernel.org
+builddate = $BUILDDATE
+packager = bootstrap_docker
+size = $INSTALLED_SIZE
+arch = x86_64
+license = GPL-2.0-only
+provides = linux=$VERSION
+provides = linux-custom=$VERSION
+EOF
+
+# Create .MTREE (required by newer pacman)
+cd "$STAGING"
+LANG=C bsdtar -czf .MTREE --format=mtree \
+    --options='!all,use-set,type,uid,gid,mode,time,size,md5,sha256,link' \
+    .PKGINFO *
+
+# Build the package
+LANG=C bsdtar -cf - .PKGINFO .MTREE * | zstd -c -T0 > "/out/${PKGNAME}-${VERSION}-1-x86_64.pkg.tar.zst"
+
+echo "==> Done: /out/${PKGNAME}-${VERSION}-1-x86_64.pkg.tar.zst"