unisonweb/unison

Built-ins to get and set file permissions

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#2,790 opened on Jan 10, 2022

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 (0 comments) (0 reactions) (0 assignees)Haskell (6,624 stars) (304 forks)batch import
feature: new builtinhelp wanted

Description

It is currently not possible to query or modify the permissions of a file or directory from Unison. Support for these functions would need a native implementation.

My use-case: In dhall-unison I'd like to check if the cache directories are readable and writeable. As a "workaround" I always attempt to read/write files and handle errors appropriately

See also this discussion on Slack https://unisonlanguage.slack.com/archives/CLUNF0J5S/p1641645307009800

Contributor guide

Tech stack
None
Domain
backenddeveloper experience
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
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
Unison knowledgeHaskell experience
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Explore existing native built in implementations in the Unison codebase to understand the pattern. Look at how similar file system functions are implemented. Review the Slack discussion for additional context on requirements. The implementation will likely involve adding new primitives in the runtime (Haskell) and exposing them in the Unison standard library.