[Qemu-devel] [PATCH v2 3/3] add debian-bootstrap.docker target (and pre script)

["Alex Bennée" <alex.bennee@linaro.org>]

Together with the debian-bootstrap.pre script can now build an arbitrary
architecture of Debian using debootstrap. The docker script will now
search for an associated $dockerfile.pre script which gets run in the
same build context as the dockerfile will be. This allows debootstrap to
set up its first stage before the container is built.

To build a container you need a command line like:

  DEB_ARCH=armhf DEB_TYPE=testing \
    ./tests/docker/docker.py build \
    --include-executable=arm-linux-user/qemu-arm debian:armhf \
    ./tests/docker/dockerfiles/debian-bootstrap.docker

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
v2
  - use .pre script instead of embedded HOST_CMD
  - make default image include all QEMU build-deps
---
 tests/docker/docker.py                           |  5 +++++
 tests/docker/dockerfiles/debian-bootstrap.docker | 21 +++++++++++++++++++++
 tests/docker/dockerfiles/debian-bootstrap.pre    |  5 +++++
 3 files changed, 31 insertions(+)
 create mode 100644 tests/docker/dockerfiles/debian-bootstrap.docker
 create mode 100755 tests/docker/dockerfiles/debian-bootstrap.pre

diff --git a/tests/docker/docker.py b/tests/docker/docker.py
index ed6fa45..43041eb 100755
--- a/tests/docker/docker.py
+++ b/tests/docker/docker.py
@@ -205,6 +205,11 @@ class BuildCommand(SubCommand):
             # Create a docker context directory for the build
             docker_dir = tempfile.mkdtemp(prefix="docker_build")
 
+            # Is there a .pre file to run in the build context?
+            docker_pre = os.path.splitext(args.dockerfile)[0]+".pre"
+            if os.path.exists(docker_pre):
+                subprocess.call(os.path.realpath(docker_pre), cwd=docker_dir)
+
             # Do we include a extra binary?
             if args.include_executable:
                 _copy_binary_with_libs(args.include_executable,
diff --git a/tests/docker/dockerfiles/debian-bootstrap.docker b/tests/docker/dockerfiles/debian-bootstrap.docker
new file mode 100644
index 0000000..3a9125e
--- /dev/null
+++ b/tests/docker/dockerfiles/debian-bootstrap.docker
@@ -0,0 +1,21 @@
+# Create Debian Bootstrap Image
+#
+# This is intended to be pre-poluated by:
+#  - a first stage debootstrap (see debian-bootstrap.pre)
+#  - a native qemu-$arch that binfmt_misc will run
+FROM scratch
+
+# Add everything from the context into the container
+ADD . /
+
+# Patch all mounts as docker already has stuff set up
+RUN sed -i 's/in_target mount/echo not for docker in_target mount/g' /debootstrap/functions
+
+# Run stage 2
+RUN /debootstrap/debootstrap --second-stage
+
+# At this point we can install additional packages if we want
+# Duplicate deb line as deb-src
+RUN cat /etc/apt/sources.list | sed "s/deb/deb-src/" >> /etc/apt/sources.list
+RUN apt-get update
+RUN apt-get -y build-dep qemu
diff --git a/tests/docker/dockerfiles/debian-bootstrap.pre b/tests/docker/dockerfiles/debian-bootstrap.pre
new file mode 100755
index 0000000..6f42da6
--- /dev/null
+++ b/tests/docker/dockerfiles/debian-bootstrap.pre
@@ -0,0 +1,5 @@
+#!/bin/sh
+#
+# Simple wrapper for debootstrap, run in the docker build context
+#
+fakeroot debootstrap --variant=buildd --foreign --arch=$DEB_ARCH $DEB_TYPE . http://httpredir.debian.org/debian
-- 
2.7.4