Claude Code isolated inside Docker with dmenu and fzf (POSIX sh)

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GitHub - shirozuki/claude-cli · GitHub

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shirozuki

claude-cli

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claude-cli

A lightweight shell wrapper that runs Claude Code inside a Docker container, keeping your host system clean while persisting your Claude configuration across sessions.

Requirements

Docker with Buildx plugin

dmenu — mode selection prompt

fzf — directory picker

Current user must be a member of the docker group

Installation

git clone https://github.com/shirozuki/claude-cli<br>chmod +x claude-cli/claude-cli.sh<br>ln -s "$PWD/claude-cli/claude-cli.sh" ~/.local/bin/claude-cli

Usage

claude-cli [-b] [-c] [-h]

Option<br>Description

-b<br>Build (or rebuild) the claude-cli:latest Docker image

-c<br>Remove all claude-cli containers; optionally remove the image

-h<br>Show help

Running without any option launches a dmenu prompt to choose a mode.

Modes

no-dir

Launches Claude without mounting any project directories. Useful for general questions, quick tasks, or exploring Claude's capabilities without exposing local files.

single-dir

Opens an fzf picker to select one directory from your home tree (up to 3 levels deep). The selected directory is mounted and set as the working directory inside the container.

multi-dir

Opens fzf in multi-select mode to pick several directories (use Tab to select), then asks you to designate one of them as the working directory. All selected directories are mounted simultaneously — useful when working across multiple repos or sharing common config directories.

Configuration persistence

Claude's configuration (~/.claude/ and ~/.claude.json) is bind-mounted into the container on every run, so your account, settings, and session history survive container restarts.

The mount source is resolved in this order:

$XDG_CONFIG_HOME/claude/ — if $XDG_CONFIG_HOME is set

$HOME/ — fallback

Configuration variables

The following environment variables can be set to override defaults without editing the script:

Variable<br>Default<br>Description

CLAUDE_IMAGE<br>claude-cli:latest<br>Docker image name to use

NOTIFY_ERROR_ICON<br>$XDG_CONFIG_HOME/dunst/critical.png<br>Icon used in desktop error notifications

Example:

CLAUDE_IMAGE=my-claude:dev claude-cli

How it works

On first run (or after -b), the script builds a Docker image based on node:lts with @anthropic-ai/claude-code installed globally. The container user is created with the same UID/GID as the host user to avoid file permission issues on bind-mounted volumes.

The image is tagged claude-cli:latest and reused on subsequent runs until you explicitly rebuild with -b.

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License

BSD-2-Clause license

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