appc/spec

actool: fetch & unpack ACI rootfs to local FS

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#250 opened on Mar 19, 2015

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component/toolinghelp wanted

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Description

Originally filed by @bcwaldon at https://github.com/coreos/rocket/issues/633

I would like to be able to discover, download, verify and unpack a given ACI to a directory on my local filesystem. For example, an ACI with the following structure discoverable at aci.example.com/foo:

/manifest
/rootfs
/rootfs/bin/foo

...could be securely unpacked into a local directory like this:

$ actool fetch --unpack aci.example.com/foo 
$ ls
bin/foo

Usage options:

actool fetch --unpack [-C <output-dir> ] <image> // default output-dir to cwd

actool fetch --unpack [-C <output-dir>] <image> [<rootfs-rel-path> ...] // maybe you can unpack specific files out of the ACI; take inspiration for -C from tar -x

Contributor guide

Research direction
Implement the 'actool fetch unpack' command by adding a new subcommand to the actool CLI. Study existing code for fetching and unpacking, and integrate with the appc spec libraries.
Tech stack
go
Domain
cli
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Go
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30