Add chezmoi toolbox image with optional dotfiles initialization #10

Copilot · 2025-12-01T19:10:31Z

Adds a chezmoi toolbox for managing dotfiles via container image.

Changes

base/Dockerfile: Added git to base image
- Git is now available to all toolbox images extending the base
- Eliminates duplication across derived images
chezmoi/Dockerfile: New image extending base toolbox
- Installs chezmoi v2.56.1 via mise (aqua:twpayne/chezmoi)
- Sets zsh as default command for easy container startup
- Accepts optional CHEZMOI_REPO build arg to initialize dotfiles during build
- Supports SSH key mounting for private repositories using RUN --mount=type=ssh
- Dynamically detects Git host from SSH URLs (GitHub, GitLab, Bitbucket, self-hosted, etc.)
- Includes security warning about code execution from dotfiles repos
devcontainer/Dockerfile: Simplified to remove git installation
- Now inherits git from base image
.github/workflows/build-chezmoi-image.yml: CI/CD pipeline following devcontainer pattern
- Triggers on chezmoi directory changes and after base image updates
- Publishes to ghcr.io/jhulten/toolbox/chezmoi
README.md: Documents available toolboxes and usage
- Updated base image description to include git
- Updated devcontainer description to remove redundant git mention
- Added security warning for CHEZMOI_REPO usage
- Simplified container run command (zsh is now default)
- Added examples for all authentication methods (HTTPS, token, SSH)

Usage

# Build without repo initialization
docker build -t my-chezmoi ./chezmoi

# Build with public dotfiles repo
docker build --build-arg CHEZMOI_REPO=https://github.com/username/dotfiles.git -t my-chezmoi ./chezmoi

# Build with private repo using SSH keys (GitHub)
docker buildx build --ssh default --build-arg [email protected]:username/dotfiles.git -t my-chezmoi ./chezmoi

# Build with private repo using SSH keys (GitLab or other Git hosts)
docker buildx build --ssh default --build-arg [email protected]:username/dotfiles.git -t my-chezmoi ./chezmoi

# Build with private repo using token
docker build --build-arg CHEZMOI_REPO=https://[email protected]/username/dotfiles.git -t my-chezmoi ./chezmoi

# Run the container (zsh starts by default)
docker run -it my-chezmoi

Warning

Using CHEZMOI_REPO will execute code from the dotfiles repository during the build process. Only use with trusted repositories.

Private Repository Access

For private dotfiles repositories, you can pass credentials via:

Token in URL: --build-arg CHEZMOI_REPO=https://[email protected]/user/dotfiles.git
SSH keys: Use Docker buildx --ssh default flag with SSH URL format (git@host:user/repo.git)
- Automatically detects Git host from SSH URL
- Works with any Git hosting service (GitHub, GitLab, Bitbucket, self-hosted)
- Only configures SSH when using SSH-based URLs (not for HTTPS)
Manual init: Skip build-time initialization and run chezmoi init after starting the container with mounted credentials

Original prompt

Create a chezmoi image based on the base toolbox that installs chezmoi and fetches a repo provided in an argument to install.

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

Co-authored-by: jhulten <[email protected]>

jhulten

Isnt git part of the base image? If not, add it there instead of in chezmoi image.

Co-authored-by: jhulten <[email protected]>

Copilot · 2025-12-01T19:33:50Z

Isnt git part of the base image? If not, add it there instead of in chezmoi image.

You're right - git wasn't in the base image but was being duplicated in both devcontainer and chezmoi. I've moved it to the base image in commit 8c68db7, which also cleaned up the devcontainer Dockerfile by removing the duplicate git installation.

Copilot

Pull request overview

This PR adds a new chezmoi toolbox image for managing dotfiles via containers. The changes refactor git installation to the base image, eliminating duplication across derived images, and introduce a new chezmoi image with optional dotfiles initialization during build time.

Key changes:

Consolidates git installation into the base image, removing duplication from devcontainer
Adds new chezmoi toolbox with version-pinned installation and optional CHEZMOI_REPO build argument
Implements CI/CD workflow following the established devcontainer pattern with base image dependency triggers

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
base/Dockerfile	Adds git package to base image for reuse across all derived toolboxes
devcontainer/Dockerfile	Removes redundant git installation now inherited from base
chezmoi/Dockerfile	New toolbox image with chezmoi v2.56.1 and optional dotfiles repo initialization
.github/workflows/build-chezmoi-image.yml	CI/CD pipeline for building and publishing chezmoi image with base image dependency handling
README.md	Documents the new chezmoi toolbox with usage examples and security warnings

Comments suppressed due to low confidence (1)

chezmoi/Dockerfile:15

The chezmoi installation uses curl -fsLS without verifying the downloaded script's integrity (e.g., checksum or signature). Consider adding verification or using a pinned version with checksum validation for better security.

RUN sh -c "$(curl -fsLS get.chezmoi.io)" -- -b /usr/local/bin -t v${CHEZMOI_VERSION}

chezmoi/Dockerfile

Copilot · 2025-12-01T19:57:07Z

.github/workflows/build-chezmoi-image.yml

+          build-args: |
+            BASE_IMAGE_TAG=${{ steps.base-tag.outputs.tag }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max


Missing trailing newline at end of file. According to POSIX standard and common best practices, text files should end with a newline character.

Fixed in commit 679a0c4.

Copilot · 2025-12-01T19:57:07Z

README.md

+Base toolbox image with common dependencies (ca-certificates, curl, git, zsh, mise).
+
+### Devcontainer
+Development container image with git, SSH, GPG, and locale support.


The description mentions "git" as available in the base image, but the Devcontainer description also lists "git" as one of its features. Since git is now inherited from the base image, this creates redundancy. Consider updating the description to focus on what Devcontainer adds beyond the base: "Development container image with SSH, GPG, and locale support."

Suggested change

Development container image with git, SSH, GPG, and locale support.

Development container image with SSH, GPG, and locale support.

Fixed in commit 679a0c4.

Copilot · 2025-12-01T19:57:07Z

chezmoi/Dockerfile

+
+# Install chezmoi using the official installation script
+ARG CHEZMOI_VERSION=2.56.1
+RUN sh -c "$(curl -fsLS get.chezmoi.io)" -- -b /usr/local/bin -t v${CHEZMOI_VERSION}


The install command uses curl get.chezmoi.io without an explicit scheme, which defaults to HTTP. Piping unverified HTTP content directly to sh enables a network attacker (e.g., MITM) to inject and execute arbitrary code during the image build. Fix by explicitly using https://get.chezmoi.io and adding integrity checks (e.g., download a specific release asset over https and verify its checksum/signature), for example:

RUN sh -c "$(curl -fsLS --proto '=https' https://get.chezmoi.io)" -- -b /usr/local/bin -t v${CHEZMOI_VERSION}

Suggested change

RUN sh -c "$(curl -fsLS get.chezmoi.io)" -- -b /usr/local/bin -t v${CHEZMOI_VERSION}

RUN sh -c "$(curl -fsLS --proto '=https' https://get.chezmoi.io)" -- -b /usr/local/bin -t v${CHEZMOI_VERSION}

Instead of using the curl endpoint, please install chezmoi with mise (aqua:twpayne/chezmoi).

Done in commits 679a0c4 and f716f20. Now using mise use --global aqua:twpayne/chezmoi@${CHEZMOI_VERSION} as the toolsmith user.

`... || exit 1` is redundant Co-authored-by: Copilot <[email protected]>

jhulten · 2025-12-01T20:01:22Z

chezmoi/Dockerfile

+
+# Install chezmoi using the official installation script
+ARG CHEZMOI_VERSION=2.56.1
+RUN sh -c "$(curl -fsLS get.chezmoi.io)" -- -b /usr/local/bin -t v${CHEZMOI_VERSION}


Instead of using the curl endpoint, please install chezmoi with mise (aqua:twpayne/chezmoi).

jhulten · 2025-12-01T20:04:03Z

README.md

+
+Run the container:
+```bash
+docker run -it my-chezmoi zsh


Make zsh the default command for a run or start

Fixed in commit 679a0c4 by adding CMD ["/bin/zsh"] to the Dockerfile.

jhulten · 2025-12-01T20:04:58Z

chezmoi/Dockerfile

+# Optional: Initialize chezmoi with a dotfiles repo
+# WARNING: This will execute code from the dotfiles repository during build.
+# Only use with trusted repositories.
+ARG CHEZMOI_REPO=""


How would we pass credentials to chezmoi to get dotfiles from a private repo?

For private repos, credentials can be passed by:

Using --build-arg CHEZMOI_REPO=https://[email protected]/user/dotfiles.git with a GitHub personal access token

Mounting SSH keys at build time with --ssh in Docker buildx (requires modifying the Dockerfile to use RUN --mount=type=ssh)

Or, skip initialization during build and run chezmoi init manually after starting the container with mounted credentials

The current implementation supports option 1. Options 2-3 would require additional Dockerfile modifications if you'd like me to add them.

Co-authored-by: jhulten <[email protected]>

Copilot · 2025-12-01T20:14:19Z

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

https://api.github.com/repos/BurntSushi/ripgrep/releases
- Triggering command: /usr/bin/mise mise use --global aqua:BurntSushi/ripgrep@latest (http block)
https://api.github.com/repos/BurntSushi/ripgrep/releases/tags/latest
- Triggering command: /usr/bin/mise mise use --global aqua:BurntSushi/ripgrep@latest (http block)
https://api.github.com/repos/BurntSushi/ripgrep/releases/tags/vlatest
- Triggering command: /usr/bin/mise mise use --global aqua:BurntSushi/ripgrep@latest (http block)
https://api.github.com/repos/twpayne/chezmoi/releases
- Triggering command: /usr/bin/mise mise ls-remote aqua:twpayne/chezmoi (http block)
- Triggering command: /usr/bin/mise mise install aqua:twpayne/[email protected] (http block)
https://api.github.com/repos/twpayne/chezmoi/releases/tags/2.56.1
- Triggering command: /usr/bin/mise mise install aqua:twpayne/[email protected] (http block)
https://api.github.com/repos/twpayne/chezmoi/releases/tags/v2.56.1
- Triggering command: /usr/bin/mise mise install aqua:twpayne/[email protected] (http block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

jhulten · 2025-12-01T20:17:39Z

@copilot Lets see option 2

Co-authored-by: jhulten <[email protected]>

… SSH when needed Co-authored-by: jhulten <[email protected]>

Copilot · 2025-12-01T20:22:03Z

@copilot Lets see option 2

Implemented in commits f8ca570 and dcfd2b3. The Dockerfile now supports SSH key mounting with:

RUN --mount=type=ssh to mount SSH keys during build
Dynamic Git host detection from SSH URLs (works with GitHub, GitLab, Bitbucket, self-hosted, etc.)
Smart SSH configuration only when using SSH-based repositories (not for HTTPS)

Usage: docker buildx build --ssh default --build-arg [email protected]:username/dotfiles.git -t my-chezmoi ./chezmoi

Initial plan

eb61f1c

Copilot AI assigned Copilot and jhulten Dec 1, 2025

Copilot started work on behalf of jhulten December 1, 2025 19:10 View session

Copilot AI and others added 2 commits December 1, 2025 19:15

Add chezmoi toolbox with Dockerfile and workflow

477a5fd

Co-authored-by: jhulten <[email protected]>

Use official chezmoi installation script for better security

55f3384

Co-authored-by: jhulten <[email protected]>

Copilot AI changed the title ~~[WIP] Add chezmoi image using base toolbox~~ Add chezmoi toolbox image with optional dotfiles initialization Dec 1, 2025

Copilot AI requested a review from jhulten December 1, 2025 19:20

Copilot finished work on behalf of jhulten December 1, 2025 19:20

jhulten requested changes Dec 1, 2025

View reviewed changes

Copilot started work on behalf of jhulten December 1, 2025 19:30 View session

Copilot AI and others added 2 commits December 1, 2025 19:32

Move git installation to base image to avoid duplication

8c68db7

Co-authored-by: jhulten <[email protected]>

Add security warning and error handling for CHEZMOI_REPO

66210e0

Co-authored-by: jhulten <[email protected]>

Copilot AI requested a review from jhulten December 1, 2025 19:35

Copilot finished work on behalf of jhulten December 1, 2025 19:35

jhulten approved these changes Dec 1, 2025

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jhulten marked this pull request as ready for review December 1, 2025 19:52

Copilot AI review requested due to automatic review settings December 1, 2025 19:52

Copilot started reviewing on behalf of jhulten December 1, 2025 19:53 View session

Copilot finished reviewing on behalf of jhulten December 1, 2025 19:55

Copilot AI reviewed Dec 1, 2025

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Apply suggestion from @Copilot

0506649

`... || exit 1` is redundant Co-authored-by: Copilot <[email protected]>

jhulten requested changes Dec 1, 2025

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Copilot started work on behalf of jhulten December 1, 2025 20:05 View session

Copilot AI and others added 2 commits December 1, 2025 20:08

Install chezmoi with mise, add CMD for zsh, and fix formatting

679a0c4

Co-authored-by: jhulten <[email protected]>

Fix mise installation to run as toolsmith user

f716f20

Co-authored-by: jhulten <[email protected]>

Copilot finished work on behalf of jhulten December 1, 2025 20:14

Copilot AI requested a review from jhulten December 1, 2025 20:14

Copilot started work on behalf of jhulten December 1, 2025 20:18 View session

Copilot AI and others added 2 commits December 1, 2025 20:19

Add SSH key mounting support for private repository access

f8ca570

Co-authored-by: jhulten <[email protected]>

Improve SSH support to dynamically detect Git host and only configure…

dcfd2b3

… SSH when needed Co-authored-by: jhulten <[email protected]>

Copilot finished work on behalf of jhulten December 1, 2025 20:23

	Development container image with git, SSH, GPG, and locale support.
	Development container image with SSH, GPG, and locale support.

	RUN sh -c "$(curl -fsLS get.chezmoi.io)" -- -b /usr/local/bin -t v${CHEZMOI_VERSION}
	RUN sh -c "$(curl -fsLS --proto '=https' https://get.chezmoi.io)" -- -b /usr/local/bin -t v${CHEZMOI_VERSION}

Add chezmoi toolbox image with optional dotfiles initialization #10

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Add chezmoi toolbox image with optional dotfiles initialization #10

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Copilot AI commented Dec 1, 2025

I tried to connect to the following addresses, but was blocked by firewall rules:

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