run: Java Jar file support

[penberg]

Adds support for running Java Jar files directly without having to
define a Capstanfile. Capstan will automatically pull
"cloudius/osv-openjdk" base image and build new image with the Jar file
in it.

To run a Jar file, simply type:

[penberg@nero capstan-example-java]$ capstan run target/capstan-example-java-1.0-SNAPSHOT-jar-with-dependencies.jar

and you will see something like this:

Building capstan-example-java-1.0-SNAPSHOT-jar-with-dependencies...
Uploading files...
[ ... ]
Created instance: capstan-example-java-1.0-SNAPSHOT-jar-with-dependencies
OSv v0.13
eth0: 192.168.122.15
hello, world!

Signed-off-by: Pekka Enberg penberg@cloudius-systems.com

[penberg]

@asias Comments on the approach? It feels like an ugly hack especially because we need to change RunConfig... Perhaps this can be done at a higher level?

[asias]

On Wed, Oct 22, 2014 at 4:03 PM, Pekka Enberg notifications@github.com
wrote:

@asias https://github.com/asias Comments on the approach? It feels like
an ugly hack especially because we need to change RunConfig... Perhaps
this can be done at a higher level?

—
Reply to this email directly or view it on GitHub
#127 (comment)
.

Pekka, I did not see any changes for RunConfig. What is the that?

So, we now have both of the following working.

$ capstan run foo.jar

$ capstan run bar.qcow

Asias

[penberg]

@asias I we update the contents of RunConfig after building an image. Look at what we do with the return value of buildJarImage.

[tzach]

@penberg how this will be extend for the next runtime (e.g. node?)
An idle solution would be to allow plugin (build pack?) to be added with out modifying capstan itself.
Clearly we can wait till we have a few before generalizing

[penberg]

@tzach It doesn't really generalize well because it's based on the assumption that there's a single Jar file that contains all the necessary dependencies and instructions how to run itself.

Having something like a "build pack" is obviously a much better long-term solution.

[tzach]

Thanks @penberg clear.
The immediate value is too important to delay further.
Lets merge and include in release 14 announcement