Build aufs support

Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>

kernel/.gitignore

@@ -1 +1,2 @@
 vmlinuz64
+aufs-utils.tar

kernel/Dockerfile

@@ -1,6 +1,6 @@
 FROM debian:jessie
 
-ENV KERNEL_VERSION 4.1.13
+ENV KERNEL_VERSION 4.1.12
 
 RUN apt-get update && apt-get -y upgrade && apt-get -y install \
   unzip \
@@ -18,15 +18,56 @@ RUN apt-get update && apt-get -y upgrade && apt-get -y install \
   isolinux \
   automake \
   pkg-config \
+  git \
+  ncurses-dev \
   p7zip-full
 
 ADD https://www.kernel.org/pub/linux/kernel/v4.x/linux-${KERNEL_VERSION}.tar.xz .
 
 RUN cat linux-${KERNEL_VERSION}.tar.xz | tar --absolute-names -xJ &&  mv /linux-${KERNEL_VERSION} /linux
 
+# http://aufs.sourceforge.net/
+ENV AUFS_REPO       https://github.com/sfjro/aufs4-standalone
+ENV AUFS_BRANCH     aufs4.1
+ENV AUFS_COMMIT     4912d6da07e3e24d7a8484e0e8a4c1315adbc8fd
+# we use AUFS_COMMIT to get stronger repeatability guarantees
+
+# Download AUFS and patch kernel
+RUN git clone -b "$AUFS_BRANCH" "$AUFS_REPO" /aufs && \
+    cd /aufs && \
+    git checkout -q "$AUFS_COMMIT" && \
+    cd /linux && \
+    cp -r /aufs/Documentation /linux && \
+    cp -r /aufs/fs /linux && \
+    cp -r /aufs/include/uapi/linux/aufs_type.h /linux/include/uapi/linux/ && \
+    set -e && for patch in \
+        /aufs/aufs*-kbuild.patch \
+        /aufs/aufs*-base.patch \
+        /aufs/aufs*-mmap.patch \
+        /aufs/aufs*-standalone.patch \
+        /aufs/aufs*-loopback.patch \
+    ; do \
+        patch -p1 < "$patch"; \
+    done
+
 COPY kernel_config /linux/.config
 
 RUN jobs=$(nproc); \
     cd /linux && \
     make -j ${jobs} oldconfig && \
-    make -j ${jobs} bzImage
+    make -j ${jobs} bzImage && \
+    make INSTALL_HDR_PATH=/tmp/kernel-headers headers_install
+
+# Build aufs tools, do this here as they need kernel headers and to match aufs
+# Fortunately they are build statically linked
+
+ENV AUFS_TOOLS_COMMIT 5e0c348bd8b1898beb1e043b026bcb0e0c7b0d54
+
+RUN git clone https://github.com/Distrotech/aufs-util.git && \
+    cd /aufs-util && \
+    git checkout "$AUFS_TOOLS_COMMIT" && \
+    CPPFLAGS="-I/tmp/kernel-headers/include" CLFAGS=$CPPFLAGS LDFLAGS=$CPPFLAGS make && \
+    DESTDIR=/tmp/aufs-utils make install && \
+    rm -rf /tmp/aufs-utils/usr/lib /tmp/aufs-utils/usr/share && \
+    cd /tmp/aufs-utils && tar cf /aufs-utils.tar .
+

kernel/Makefile

@@ -1,8 +1,13 @@
-all:	vmlinuz64
+all:	vmlinuz64 aufs-utils.tar
 
-vmlinuz64: kernel_config
-	docker build -t mobykernel:test .
-	docker run mobykernel:test cat /linux/arch/x86_64/boot/bzImage > vmlinuz64
+kernel: kernel_config Dockerfile
+	docker build -t mobykernel:build .
+
+vmlinuz64: kernel
+	docker run mobykernel:build cat /linux/arch/x86_64/boot/bzImage > vmlinuz64
+
+aufs-utils.tar: kernel
+	docker run mobykernel:build cat /aufs-utils.tar > aufs-utils.tar
 
 clean:
-	rm -f vmlinuz64
+	rm -f vmlinuz64 aufs-utils.tar

kernel/kernel_config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 4.1.13 Kernel Configuration
+# Linux/x86 4.1.12 Kernel Configuration
 #
 CONFIG_64BIT=y
 CONFIG_X86_64=y
@@ -223,7 +223,6 @@ CONFIG_VM_EVENT_COUNTERS=y
 # CONFIG_COMPAT_BRK is not set
 CONFIG_SLAB=y
 # CONFIG_SLUB is not set
-# CONFIG_SLOB is not set
 # CONFIG_SYSTEM_TRUSTED_KEYRING is not set
 CONFIG_PROFILING=y
 CONFIG_TRACEPOINTS=y
@@ -2563,6 +2562,23 @@ CONFIG_PSTORE=y
 # CONFIG_PSTORE_RAM is not set
 # CONFIG_SYSV_FS is not set
 # CONFIG_UFS_FS is not set
+CONFIG_AUFS_FS=y
+# CONFIG_AUFS_BRANCH_MAX_127 is not set
+# CONFIG_AUFS_BRANCH_MAX_511 is not set
+# CONFIG_AUFS_BRANCH_MAX_1023 is not set
+CONFIG_AUFS_BRANCH_MAX_32767=y
+CONFIG_AUFS_SBILIST=y
+# CONFIG_AUFS_HNOTIFY is not set
+# CONFIG_AUFS_EXPORT is not set
+CONFIG_AUFS_XATTR=y
+# CONFIG_AUFS_FHSM is not set
+# CONFIG_AUFS_RDU is not set
+# CONFIG_AUFS_SHWH is not set
+# CONFIG_AUFS_BR_RAMFS is not set
+# CONFIG_AUFS_BR_FUSE is not set
+# CONFIG_AUFS_BR_HFSPLUS is not set
+CONFIG_AUFS_BDEV_LOOP=y
+# CONFIG_AUFS_DEBUG is not set
 CONFIG_NETWORK_FILESYSTEMS=y
 CONFIG_NFS_FS=y
 CONFIG_NFS_V2=y