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 (304 forks)batch import
feature: new builtinhelp wanted

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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

Research direction
Study Unison's built in mechanism by examining existing native functions like 'File.read' and 'File.write'. Understand how Haskell code is exposed to Unison via the foreign function interface. Implement getFilePermissions and setFilePermissions using Haskell's System.Posix.Files module.
Tech stack
haskell
Domain
backend
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
HaskellUnison basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40