Merge pull request #7 from justinsb/packages2aci

packages2aci for Java7 image

Author: jonboulle

README.md

@@ -46,3 +46,11 @@ Flannel has [dist/build-aci.sh](https://github.com/coreos/flannel/blob/master/di
 ```
 $ cd dist && ./build-aci.sh TAG
 ```
+
+### Java7 base image
+
+A base image containing OpenJDK 7 can be build using (packages2aci)[packages2aci.md].
+
+```
+bin/packages2aci java7/
+```

bin/packages2aci

@@ -0,0 +1,63 @@
+#!/bin/bash
+
+set -e
+
+SRCDIR=$1
+
+if [[ -z "${SRCDIR}" ]]; then
+  echo "Syntax: packages2aci <directory>"
+  exit 1
+fi
+
+if [[ ! -d "${SRCDIR}" ]]; then
+  echo "$1 is not a directory"
+  exit 1
+fi
+
+which actool || (echo "Make sure actool is on your path"; exit 1)
+
+pushd ${SRCDIR}
+SRCDIR=`pwd`
+popd
+
+OUTPUT=${SRCDIR}/image.aci
+BUILD=${SRCDIR}/.build/
+
+# apt-get reuses cached packages
+mkdir -p ${BUILD}/packages/
+
+# start from an empty build directory every time
+rm -rf ${BUILD}/layout
+mkdir -p ${BUILD}/layout/rootfs/
+
+# download packages specified in packages
+for p in `cat ${SRCDIR}/packages`; do
+  echo "Downloading $p"
+  pushd ${BUILD}/packages/
+  apt-get download $p
+  popd
+done
+
+# extract the packages into the rootfs dir
+for d in ${BUILD}/packages/*.deb; do
+  echo "Extracting $d"
+  dpkg-deb -x ${d} ${BUILD}/layout/rootfs/
+done
+
+# copy the ACI manifest file
+cp ${SRCDIR}/manifest ${BUILD}/layout/
+
+# call user postbuild script
+if [[ -x ${SRCDIR}/postbuild ]]; then
+  pushd ${BUILD}/layout/rootfs
+  ${SRCDIR}/postbuild ${BUILD}/layout/rootfs
+  popd
+fi
+
+# build the ACI
+actool build --overwrite ${BUILD}/layout/ ${OUTPUT}
+
+# great success
+echo "Your image is now available at ${OUTPUT}"
+echo "Test with: sudo rkt --insecure-skip-verify=true run ${OUTPUT}"
+ 

java7/.gitignore

@@ -0,0 +1,3 @@
+.build/
+image.aci
+

java7/manifest

@@ -0,0 +1,10 @@
+{
+  "acVersion": "0.5.1",
+  "acKind": "ImageManifest",
+  "name": "java",
+  "app": {
+    "exec": [ "/java", "-version" ],
+    "user": "0",
+    "group": "0"
+  }
+}

java7/packages

@@ -0,0 +1,37 @@
+ca-certificates-java
+java-common
+libasound2
+libatk1.0-0
+libatk-wrapper-java-jni
+libc6
+libcairo2
+libcups2
+libfontconfig1
+libfreetype6
+libgcc1
+libgdk-pixbuf2.0-0
+libgif4
+libglib2.0-0
+libgtk2.0-0
+libjpeg62-turbo
+libkrb5-3
+liblcms2-2
+libnss3
+libpango-1.0-0
+libpangocairo-1.0-0
+libpangoft2-1.0-0
+libpcsclite1
+libpng12-0
+libpulse0
+libstdc++6 
+libx11-6
+libxext6
+libxi6
+libxinerama1
+libxrandr2
+libxrender1
+libxtst6
+openjdk-7-jre
+openjdk-7-jre-headless
+tzdata-java
+zlib1g

java7/postbuild

@@ -0,0 +1,7 @@
+#!/bin/bash -e
+
+ROOTFS=${1}
+cd ${ROOTFS}
+
+# symlink java
+ln -s usr/lib/jvm/java-7-openjdk-amd64/bin/java java

packages2aci.md

@@ -0,0 +1,24 @@
+# Create ACI images from Debian packages
+
+This is a simple tool to create an ACI image using your operating system packages.
+
+It includes an example to build a Java7 base image in [java7](java7).
+
+### Steps to create your ACI image:
+
+1. Create a directory to hold your work (e.g. [java7](java7))
+1. Create the [packages](java7/packages) file with a list of packages to be installed, one per line.
+1. Create a [manifest](java7/manifest) file which will be your ACI manifest.
+1. (Optional) Create a [postbuild](java7/postbuild) script to do any post-processing after the packages are installed.  Here, we set up a convenience symlink.
+1. Run `./packages2aci <dirname>` to build your ACI image (e.g. `./packages2aci java7`)
+
+Your ACI image is then in `<dirname>/image.aci`.  Run it using:
+
+```
+sudo rkt --insecure-skip-verify=true run java7/image.aci
+```
+
+### Limitations:
+
+* You have to specify each package individually; it doesn't do recursive dependency analysis.
+* This works using your currently installed operating system, so is OS dependent.  (This could easily be fixed by doing this inside a rkt image!)