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App-dozo-1.01
/ README.md

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NAME

dozo - Dôzo, Docker with Zero Overhead

SYNOPSIS

dozo -I IMAGE [ options ] [ command ... ]

-h, --help         show help
    --version      show version
-d, --debug        debug mode (show full command)
-x, --trace        trace mode (set -x)
-q, --quiet        quiet mode
-n, --dryrun       dry-run mode

-I, --image=#      Docker image (required unless -D)
-D, --default      use default image
-E, --env=#        environment variable to inherit (repeatable)
-W, --mount-cwd    mount current working directory
-H, --mount-home   mount home directory
-U, --unmount      do not mount any directory
    --mount-mode=# mount mode (rw or ro, default: rw)
-R, --mount-ro     mount read-only (shortcut for --mount-mode=ro)
-V, --volume=#     additional volume to mount (repeatable)
-B, --batch        batch mode (non-interactive)
-L, --live         use live (persistent) container
-N, --name=#       live container name
-K, --kill         kill and remove existing container
-P, --port=#       port mapping (repeatable)
-O, --other=#      additional docker options (repeatable)

VERSION

Version 1.00

USAGE

When executed without arguments, Dôzo starts an interactive shell inside the container. When arguments are given, they are executed as a command.

dozo -I alpine                  # start shell
dozo -I alpine ls -la           # run command

By setting -D or your favorite image with -I in ~/.dozorc, you can simply run Dôzo without specifying an image. Since the git top directory is automatically mounted, git commands work as expected from anywhere in the tree.

$ dozo                          # start shell
$ dozo git log -p               # run git log -p

With -L option, you can use a persistent container. Tools installed in the container will remain available for subsequent use.

$ dozo -L                       # start shell and create container
# apt update && apt install -y cowsay
# exit
$ dozo -L /usr/games/cowsay Dôzo
 ______
< Dôzo >
 ------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

INSTALLATION

Using cpanminus:

cpanm -n App::dozo

To install the latest version from GitHub:

cpanm -n https://github.com/tecolicom/App-dozo.git

Alternatively, you can simply place dozo and getoptlong.sh in your PATH.

Dôzo requires Bash 4.4 or later, as does the getoptlong.sh script it uses.

DESCRIPTION

Dôzo is a generic Docker runner that simplifies running commands in Docker containers. The name comes from the Japanese word "dôzo" (どうぞ) meaning "please" or "go ahead", and also stands for "Docker with Zero Overhead". The command name is dozo for ease of typing.

It automatically configures the tedious Docker options such as volume mounts, environment variables, working directories, and interactive terminal settings, so you can focus on the command you want to run.

Dôzo is distributed as a standalone module and can be used as a general-purpose Docker runner. It was originally developed as part of App::Greple::xlate and is used by xlate for Docker operations.

Dôzo uses getoptlong.sh for option parsing.

Key Features

OPTIONS

Repeatable options (-E, -V, -P and -O) can be given more than once, and a single value is also split into multiple elements at spaces, tabs and commas. Thus -P 8000,9000 gives two port mappings, and -O with the value --memory 2g gives two docker options. As a consequence, a value containing a space cannot be given as a single element: -E with the value MSG=hello world defines two variables, MSG=hello and world.

INTERACTIVE MODE

Unless the -B (batch) option is given, the container is started with Docker's --interactive option, and --tty is added as well when the standard input is a terminal (TTY). The same rule is applied to docker exec in live container mode.

This allows seamless interactive use when attaching to containers or running interactive commands.

LIVE CONTAINER

The -L option enables live (persistent) container mode. Unlike normal mode where containers are removed after execution (--rm), live containers persist between invocations, allowing you to maintain state and reduce startup overhead.

Container Lifecycle

When -L is specified, Dôzo behaves as follows:

Container Naming

Container names are automatically generated in the format:

<image_name>.<mount_directory>

For example, if you run:

dozo -I tecolicom/xlate -L

from /home/user/project, the container name would be xlate.project.

You can override the auto-generated name using the -N option:

dozo -I tecolicom/xlate -L -N mycontainer

Managing Live Containers

CONFIGURATION FILE

.dozorc files are loaded from the following locations in order:

For single-value options (like -I, -N), later values override earlier ones. For repeatable options (like -E, -V, -P, -O), all values are accumulated in order.

You can use any command line option in the configuration file:

# Example .dozorc
-I tecolicom/xlate:latest
-E CUSTOM_VAR=value
-V /data:/data

Lines starting with # are treated as comments. A # in the middle of a line does not start a comment, and a trailing comment is not supported.

Each line is split into arguments in the same way as the shell does, so quotation marks have to be balanced. A line which cannot be parsed is an error, and Dôzo stops after showing the file name, the line number and the line itself.

Write nothing but options in the configuration file. Its contents are placed before the command line arguments, and option parsing stops at the first argument which is not an option. Everything after it, including options given on the command line, is passed to the container as the command to execute. This is the rule which lets you write dozo -I alpine ls -la without -la being taken as an option of Dôzo, but it also means that a stray word in .dozorc disables option parsing altogether. With a trailing comment like this:

-I alpine  # use alpine

dozo -n ls does not show the docker command line but runs # use alpine -n ls in the container.

DOCKER-IN-DOCKER

To use Docker commands inside the container, mount the host's Docker socket:

# .dozorc for Docker-in-Docker
-I docker
-V /var/run/docker.sock

This allows you to run Docker commands from within the container using the host's Docker daemon:

$ dozo docker run --rm alpine uname -a

Or run it as a one-liner without .dozorc:

$ dozo -I docker -V /var/run/docker.sock docker run --rm alpine uname -a

DEFAULT IMAGE

The tecolicom/xlate image is specifically designed for document translation and text processing tasks, providing a comprehensive environment with the following features:

Translation and AI Tools

Text Processing Tools

Greple Extensions

Multiple App::Greple extension modules are pre-installed:

Git Integration

The image includes a pre-configured git environment optimized for document comparison and review. Since Dôzo automatically mounts the git top directory by default, git commands work seamlessly with full repository context:

Additional Utilities

Environment

ENVIRONMENT

Configuration Variables

Inherited Variables

The following environment variables are inherited by default:

LANG TZ
HTTP_PROXY HTTPS_PROXY http_proxy https_proxy
TERM_PROGRAM TERM_BGCOLOR COLORTERM
DEEPL_AUTH_KEY OPENAI_API_KEY ANTHROPIC_API_KEY LLM_PERPLEXITY_KEY

Container Variables

The following environment variables are set inside the container:

SEE ALSO

xlate, App::Greple::xlate

getoptlong.sh

AUTHOR

Kazumasa Utashiro

LICENSE

Copyright © 2025-2026 Kazumasa Utashiro.

This software is released under the MIT License. https://opensource.org/licenses/MIT