appc/spec

actool build: Error walking rootfs: archive/tar: write too long

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#503 opened on Sep 25, 2015

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Description

If you try to output your aci into the input directory you get a very esoteric error message:

$ actool build /tmp/build-dir-wtZCZk  /tmp/build-dir-wtZCZk/my-code-1.0-linux-amd64.aci 
build: Error walking rootfs: archive/tar: write too long

Took me a good 20 minutes to figure out the problem goes away if I write my aci to a different directory.

Note that tar doesn't suffer from this problem because it collects the file list before creating the output file.

$ go version
go version go1.4.1 linux/amd64

Contributor guide

Research direction
Investigate the 'archive/tar: write too long' error. The issue occurs when the output ACI is written into the same directory being walked. Examine how actool walks the rootfs and writes the tar archive concurrently, and consider implementing a two pass approach (collect file list first) to avoid the race condition.
Tech stack
go
Domain
clitooling
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
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.
70