From c70b432b6facd5a072f518444acc2645eeb967b5 Mon Sep 17 00:00:00 2001
From: Justin Cormack <justin.cormack@unikernel.com>
Date: Thu, 31 Dec 2015 00:25:25 +0000
Subject: [PATCH] add experimental package for qemu-user emulation for arm

Signed-off-by: Justin Cormack <justin.cormack@unikernel.com>
---
 alpine/Dockerfile                                 |  3 +++
 alpine/packages/qemu-user-static/.gitignore       |  1 +
 alpine/packages/qemu-user-static/Dockerfile       |  3 +++
 alpine/packages/qemu-user-static/Makefile         | 10 ++++++++++
 alpine/packages/qemu-user-static/binfmt-arm       |  9 +++++++++
 .../qemu-user-static/etc/init.d/qemu-user-static  | 15 +++++++++++++++
 6 files changed, 41 insertions(+)
 create mode 100644 alpine/packages/qemu-user-static/.gitignore
 create mode 100644 alpine/packages/qemu-user-static/Dockerfile
 create mode 100644 alpine/packages/qemu-user-static/Makefile
 create mode 100644 alpine/packages/qemu-user-static/binfmt-arm
 create mode 100755 alpine/packages/qemu-user-static/etc/init.d/qemu-user-static

diff --git a/alpine/Dockerfile b/alpine/Dockerfile
index 0588c009d..230045eee 100644
--- a/alpine/Dockerfile
+++ b/alpine/Dockerfile
@@ -33,6 +33,8 @@ COPY packages/diagnostics/etc /etc/
 COPY packages/automount/etc /etc/
 COPY packages/9pinit/etc /etc/
 COPY packages/ntp15m/etc /etc/
+COPY packages/qemu-user-static/qemu-* /usr/bin/
+COPY packages/qemu-user-static/etc /etc/
 
 RUN \
   rc-update add swap boot && \
@@ -63,6 +65,7 @@ RUN \
   rc-update add mdnstool default && \
   rc-update add automount boot && \
   rc-update add diagnostics default && \
+  rc-update add qemu-user-static sysinit && \
   ln -s /bin/busybox /init
 
 CMD ["/bin/sh"]
diff --git a/alpine/packages/qemu-user-static/.gitignore b/alpine/packages/qemu-user-static/.gitignore
new file mode 100644
index 000000000..4e5fcd368
--- /dev/null
+++ b/alpine/packages/qemu-user-static/.gitignore
@@ -0,0 +1 @@
+qemu-arm-static
diff --git a/alpine/packages/qemu-user-static/Dockerfile b/alpine/packages/qemu-user-static/Dockerfile
new file mode 100644
index 000000000..1c5345415
--- /dev/null
+++ b/alpine/packages/qemu-user-static/Dockerfile
@@ -0,0 +1,3 @@
+FROM debian:jessie
+
+RUN apt-get update && apt-get -y install qemu-user-static
diff --git a/alpine/packages/qemu-user-static/Makefile b/alpine/packages/qemu-user-static/Makefile
new file mode 100644
index 000000000..d03803c29
--- /dev/null
+++ b/alpine/packages/qemu-user-static/Makefile
@@ -0,0 +1,10 @@
+all: qemu-arm-static 
+
+qemu-arm-static :
+	docker build -t qemu-user-static:build .
+	docker run qemu-user-static:build cat /usr/bin/qemu-arm-static > qemu-arm-static
+	chmod 755 qemu-arm-static
+	docker run qemu-user-static:build cat /var/lib/binfmts/qemu-arm > binfmt-arm
+
+clean:
+	rm -f qemu-arm-static binfmt-arm
diff --git a/alpine/packages/qemu-user-static/binfmt-arm b/alpine/packages/qemu-user-static/binfmt-arm
new file mode 100644
index 000000000..66b3c65ba
--- /dev/null
+++ b/alpine/packages/qemu-user-static/binfmt-arm
@@ -0,0 +1,9 @@
+qemu-user-static
+magic
+0
+\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00
+\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff
+/usr/bin/qemu-arm-static
+
+yes
+
diff --git a/alpine/packages/qemu-user-static/etc/init.d/qemu-user-static b/alpine/packages/qemu-user-static/etc/init.d/qemu-user-static
new file mode 100755
index 000000000..b3d00fd86
--- /dev/null
+++ b/alpine/packages/qemu-user-static/etc/init.d/qemu-user-static
@@ -0,0 +1,15 @@
+#!/sbin/openrc-run
+
+description="Configure binfmt misc emulation"
+
+start()
+{
+	ebegin "Configuring binfmt misc"
+	mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
+	echo ":qemu-arm:M:0:\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/bin/qemu-arm-static:OC" > /proc/sys/fs/binfmt_misc/register
+}
+
+stop()
+{
+	umount /proc/sys/fs/binfmt_misc
+}