Mounting files to be used during features build

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
35/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
docker, typescript
Domain
build-system, devops

Research direction

Start at the devcontainer up flow and the feature installation path, then compare the requested behavior with BuildKit's RUN --mount option. Done means files downloaded before startup can be made available during feature installation without breaking existing dev container builds.

Written by the indexing model from the issue text.

Description

feature-request

I'd like to be able to mount some files which then be later used during feature installation.

My use case looks as follows:

  1. Before running devcontainer up I download some files
  2. Then custom feature needs to do some processing on downloaded files - but it fails since those files are not available during build

I can see that within the BuildKit there is an option that we can leverage:
https://docs.docker.com/reference/dockerfile/#run---mount

Dominant language
TypeScript
Stars
3k
Forks
461
Avg merge
18m
Merged PRs (30d)
5

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