libappc

Note: Not actively being worked on.

Overview

A C++ library for working with App Containers. The goal of the libary is to be a flexible toolkit: manifest parsing and creation, pluggable discovery, image creation / extraction / caching, thin-provisioned file systems, etc...not a particular ACE implementation. In other words, the goal is that you can use it to make one. Some or all pieces may be used, just use the headers you require.

Getting Started

Requires libarchive, libcurl, and functional std::regex (If using gcc, >= 4.9)

1. Bootstrap it (download and build dependencies): ./bootstrap.sh
2. Run the tests: ./test.sh
3. Build the examples: ./build.sh

Status

Early, early (like really early) development. Many pieces are incomplete and require tests, build scripts need work, use of syntax likely inconsistent, etc.

Components that exist in some form:

• Schema parsing and validation
• Discovery (Simple, Local, no Meta)
• ACI inspection and extraction

Examples

Example code is located in src/examples. Run build.sh and the examples will be built in bin/examples, e.g.

$ ./build.sh
--- 8< ---
[100%] Built target validate

$ ./bin/examples/schema/generate_complete_crm > /tmp/container.json

$ ./bin/examples/schema/validate /tmp/container.json || echo invalid

$ ./bin/examples/schema/parse /tmp/container.json
Kind: ContainerRuntimeManifest
Version: 0.2.0
UUID: 0F426158-97EE-49F8-B4A3-792ECDA926FB
--- 8< ---

$ ./bin/examples/schema/validate image_bad.json
Invalid Manifest: "imageID must be <hash name>-<hex representation> format"

$ ./bin/examples/discovery/discover_image nosecone.net/example/test 
Resolved: nosecone.net/example/test -> file:///tmp/images/nosecone.net/example/test-1.0.0-linux-amd64.aci
Fetch failed: file:///tmp/images/nosecone.net/example/test-1.0.0-linux-amd64.aci No such file or directory
Resolved: nosecone.net/example/test -> https://nosecone.net/example/test-1.0.0-linux-amd64.aci
Fetched: https://nosecone.net/example/test-1.0.0-linux-amd64.aci
Stored: file:///tmp/images/nosecone.net/example/test-1.0.0-linux-amd64.aci

Contributing

See CONTRIBUTING.md

License

libappc is licensed under the Apache License, Version 2.0.

Included 3rd party libraries/headers (subject to change):

• JSON parsing is performed by Niels Lohmann's library which is licensed under the MIT license.
• Image retrieval is performed by libcurl which is licensed under the MIT license.
• Image extraction is performed by libarchive which is licensed under the BSD 2-Clause license.