fix: add btrfs support using magic (#5)

* Use old GPL release from https://github.com/fabianishere/udm-kernel/tree/master to build and steal it's btrfs kernel module + depends.
* Can't use full kernel, NIC issues everywhere, so we will just use it for btrfs for OMV. Will move to our own kernel fully if I can get an updated GPL release from Ui.
* BONUS: Fixup issue where system would reboot when shutdown from touch screen

scripts/docker/bootstrap/001-bootstrap

@@ -10,6 +10,9 @@ export APT_LISTCHANGES_FRONTEND=none
 debconf-set-selections /debconf.set
 rm -f /debconf.set
 
+# Run depmod for our kernel so we pick up btrfs + more
+depmod -a 4.19.152-alpine-unvr
+
 # Initial package install
 apt-get clean
 apt-get update

scripts/docker/build_kernel.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+set -e
+
+scripts_path="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
+. ${scripts_path}/vars.sh
+
+# Make our temp builddir outside of the world of mounts for SPEEDS
+kernel_builddir=$(mktemp -d)
+tar -xzf ${root_path}/downloads/${kernel_filename} -C ${kernel_builddir}
+
+# Exports baby
+export PATH=${build_path}/toolchain/${toolchain_bin_path}:${PATH}
+export GCC_COLORS=auto
+export CROSS_COMPILE=${toolchain_cross_compile}
+export ARCH=arm64
+
+# Here we go
+cd ${kernel_builddir}/${kernel_filename%.tar.gz}
+
+# If we have patches, apply them
+if [[ -d ${root_path}/patches/kernel/ ]]; then
+    for file in ${root_path}/patches/kernel/*.patch; do
+        echo "Applying kernel patch ${file}"
+        patch -p1 < ${file}
+    done
+fi
+
+# Apply overlay if it exists
+if [[ -d ${root_path}/overlay/${kernel_overlay_dir}/ ]]; then
+    echo "Applying ${kernel_overlay_dir} overlay"
+    cp -R ${root_path}/overlay/${kernel_overlay_dir}/* ./
+fi
+
+# Normally we would build a full kernel, but the old GPL doesn't work right with NICs and I don't
+# want to debug a 2+ year old GPL source. Waiting for Unifi to release the lastest GPL code, and
+# then we can fully move to our own custom kernel but for now we just use the old GPL to strip out
+# some modules. This is why some lines below are commented out.
+
+# Build as normal, with our extra version set to a timestamp
+make ${kernel_config} 
+make -j`getconf _NPROCESSORS_ONLN` EXTRAVERSION=-alpine-unvr # Build kernel and modules
+#make -j`getconf _NPROCESSORS_ONLN` EXTRAVERSION=-alpine-unvr Image.gz # makes gzip image
+make INSTALL_MOD_PATH=./modules-dir -j`getconf _NPROCESSORS_ONLN` EXTRAVERSION=-alpine-unvr modules_install # installs modules to dir
+#mkimage -A arm64 -O linux -T kernel -C gzip -a 04080000 -e 04080000 -n "Linux-UNVR-NAS-$(date +%Y%m%d-%H%M%S)" -d ./arch/arm64/boot/Image.gz uImage
+
+# Save our config
+mkdir -p ${build_path}/kernel
+make savedefconfig
+mv defconfig ${build_path}/kernel/kernel_config
+
+# Save our kernel(s) and libs
+#cp ./arch/arm64/boot/Image.gz ${build_path}/kernel
+#mv uImage ${build_path}/kernel
+mv ./modules-dir ${build_path}/kernel/kernel-modules

scripts/docker/run_debootstrap.sh

@@ -19,10 +19,15 @@ debootstrap --no-check-gpg --foreign --arch=${deb_arch} --include=apt-transport-
 cp /usr/bin/qemu-aarch64-static usr/bin/
 chroot ${build_path}/rootfs /debootstrap/debootstrap --second-stage
 
-# Copy over our kernel modules and kernel
-mv -f "${build_path}/fw-extract/rootfs/lib/modules" ${build_path}/rootfs/lib
+# Copy over our kernel modules and kernel from the FS image
+# Note that in the future, we wanna use our own kernel, but the current GPL is way too old!!!!!
+mv -f "${build_path}/fw-extract/rootfs/lib/modules" "${build_path}/rootfs/lib"
 cp "${build_path}/fw-extract/kernel.bin" "${build_path}/rootfs/boot/uImage"
 
+# Now, for the old kernel we built, pull in btrfs + depends modules (we do depmod in bootstrap)
+cp "${build_path}/kernel/kernel-modules/lib/modules/4.19.152-alpine-unvr/kernel/lib/zstd/zstd_compress.ko" "${build_path}/rootfs/lib/modules/4.19.152-alpine-unvr/extra/"
+cp "${build_path}/kernel/kernel-modules/lib/modules/4.19.152-alpine-unvr/kernel/fs/btrfs/btrfs.ko" "${build_path}/rootfs/lib/modules/4.19.152-alpine-unvr/extra/"
+
 # Copy over our overlay if we have one
 if [[ -d ${root_path}/overlay/${fs_overlay_dir}/ ]]; then
 	echo "Applying ${fs_overlay_dir} overlay"