Hi James, Nice. This is a nice example showing how to reduce a python snap package. A few days ago, I also made a small example to make use of the python3 coming with the core at:
https://github.com/liu-xiao-guo/httpstat In the above example, I in fact do not package the python. It works. Thanks & best regards, XiaoGuo On Mon, Feb 20, 2017 at 10:16 AM, James Henstridge < james.henstri...@canonical.com> wrote: > To learn a bit more about I put together a snap for Python 3.6.0, > which can be installed with: > > snap install --edge python36-jamesh > > You can then run "python36-jamesh.python3", which will give you the a > Python shell running with strict confinement, with the full standard > library available. > > Now I know Snapcraft already has support for packaging Python > applications, so what benefits does this package add? There were a > few extra points in how I built the package: > > 1. the interpreter binary and extension modules all have appropriate > $ORIGIN relative rpath set. > > 2. a sitecustomize.py is provided that will add > $SNAP/lib/python3.6/site-packages to sys.path. (more on why this is > useful later) > > This makes the interpreter fully relocatable in the file system while > still being able to find the bundled libraries. In turn, this means > the interpreter is functional when exported to another snap via the > content interface. > > To demonstrate this, I put together a trivial "hello world" snapcraft > project here: > > https://github.com/jhenstridge/python-snap-pkg/tree/master/examples/hello- > world > > After building this package, it can be run after installing and > connecting the interface: > > $ snap install --dangerous hello-world_0.1_amd64.snap > hello-world 0.1 installed > $ snap connect hello-world:python3 python36-jamesh:python3 > $ hello-world > Hello world! > > Since the hello-world snap doesn't actually include Python, it is > quite light weight (4 kB, which I think is as small as a squashfs > gets). The space savings may not be that great with a single snap > (the interpreter snap is almost 20MB), but the space savings increase > as you install more snaps using the interface. It also means that we > could upgrade to Python 3.6.1 (when it comes out) without rebuilding > this snap. > > And since the interpreter is being run under the hello-world snap's > confinement policy, it can do potentially do things the main > "python36-jamesh.python3" binary can't. For example, if you add the > "network" plug, you'll be able to access the network. > > And the sitecustomize script will also mean the interpreter can locate > packages shipped in the plug snap. > > I'd be interested in any suggestions or feedback about the snap. > > Thanks, > > James. > > -- > Snapcraft mailing list > Snapcraft@lists.snapcraft.io > Modify settings or unsubscribe at: https://lists.ubuntu.com/ > mailman/listinfo/snapcraft > -- XiaoGuo, Liu
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