dcli
  • Introduction
  • What does DCli do?
  • Install DCli
    • Installing on Windows
  • Writing your first CLI app
  • Add DCli to your project
  • pub.dev
  • github
  • Dart basics
    • Dart lambda functions
    • Function Arguments
    • Futures
    • stdin/stdout/stderr a primer
  • Tour
    • Overview
    • Using DCli functions
    • User input
      • Ask Validators
    • Displaying information
    • Managing Files And Directories
    • Environment variables
    • Calling apps
    • Redirecting output
    • Command Line Arguments
    • Paths
    • Glob Expansion
    • Piping
    • Locking
    • Fetch
    • The evils of CD
    • Assets/Resources
    • Cross Platform
      • Posix
      • Windows
      • Docker
        • Detecting Docker
        • Add DCli to a Docker Container
        • Example DCli app in Docker
  • Elevated Privileges
    • Sudo
  • Performance
  • Dependency Management
    • Dependency Management
    • Pubspec Managment
  • DCli Tools
    • DCli tools
    • Use a shebang #!
    • DCli Compile
    • DCli Clean
    • DCli Create
    • DCli Doctor
    • DCli Install
    • DCli Run
    • DCli Warmup
    • DCli Pack
    • Upgrade DCli
  • Internal Workings
    • Internal Workings
    • waitForEx
  • Contributing
    • Creating a release
    • Running Unit tests
    • Implemention support for a shell
    • Templates
  • References
  • Examples
    • Projects
    • Code
      • hello world.
      • dcompress
      • dpath
      • dmysql
      • dshell
      • dwhich
      • dipaddr
      • gnome launcher
  • Articles
    • build CLI apps in dart - part 1
    • build CLI apps in dart - part 2
    • Dealing with permissions
    • 3rd Party console packages
  • Dart on Linux - the perfect CLI tooling
  • Improving your build environment
    • Existing tooling
    • Building with Dart
    • A home for your build tools
  • Olivier Revial - CLI apps made easy
  • Video: package of the week
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  • DockerShell
  • Detecting if you are running in a Docker

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  1. Tour
  2. Cross Platform
  3. Docker

Detecting Docker

The DCli api allows you to detect if you are running in a Docker container

DockerShell

DCli has the ability to detect which shell (bash, powershell, zsh etc) that you are running under.

If you DCli app is used as the Docker ENTRYPOINT then your parent won't be a shell.

In this case calling Shell.current will return a DockerShell:

DockerShell shell = Shell.current;

Attributes of DockerShell.

  • shell name is 'docker'

  • loggedInUser = 'root'

  • isPrivilegedUser will always be true

Detecting if you are running in a Docker

Using DockerShell to detect if you are in a Docker container is not reliable as in some circumstances you DCli app will be run from within a standard shell (bash etc) within Docker

Instead use:

if (DockerShell.inDocker)
{
    /// do something docker
}

This method looks for the presence of /.dockerenv which Docker guarantee will exist.

PreviousDockerNextAdd DCli to a Docker Container

Last updated 2 years ago

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