Local Feature to install Oh-My-Posh in a devcontainer

devcontainer-feature.json

{
    // this file goes to .devcontainer/features/oh-my-posh/
  
    "name": "oh-my-posh",
    "description": "oh-my-posh",
    "version": "0.1.0",
    "options": {
        "defaultTemplate": {
            "type": "string",
            "default": "jandedobbeleer",
            "description": "The default oh-my-posh theme to use"
        }
    },
    "dependsOn": {
        "ghcr.io/devcontainers/features/common-utils:2": {
            "installZsh": false,
            "installOhMyZsh": false,
            "installOhMyZshConfig": false
        },
        "ghcr.io/devcontainers/features/powershell:1": {
            "version": "7.4.1",
            "modules": "posh-git,z,PSFzf,Terminal-Icons"
        },
    },
    "installsAfter": [
        "ghcr.io/devcontainers/features/powershell"
    ]
}

devcontainer.json

{
    // this file goes to .devcontainer/
  
    "name": "your devcontainer",
    
    "image": "mcr.microsoft.com/devcontainers/base:ubuntu-22.04",

    "features": {
        "ghcr.io/devcontainers/features/common-utils:2": {
            "installZsh": false,
            "installOhMyZsh": false,
            "installOhMyZshConfig": false
        },
        "ghcr.io/devcontainers/features/powershell:1": {
            "version": "7.4.1",
            "modules": "posh-git,z,PSFzf,Terminal-Icons"
        },
        "./features/oh-my-posh": {
            // optional: select one of the templates
            "defaultTemplate": "tokyo"
        }
    },

    "customizations": {
        "vscode": {
            "settings": {
                // optional: make pwsh the default shell in VS code terminal
                "terminal.integrated.shell.linux": "/opt/microsoft/powershell/7/pwsh"
            },
            "extensions": [
                // optional
                "ms-vscode.powershell",
            ]
        }
    }
}    

install.sh

#!/bin/bash

# this file goes to .devcontainer/features/oh-my-posh/

# makre sure we have fzf installed
apt-get update && apt-get install -y fzf

# Install oh-my-posh:
curl -s https://ohmyposh.dev/install.sh | bash -s

# Copy oh-my-posh cache (and themes) from root to the vscode user:
mkdir -p "${_REMOTE_USER_HOME}/.cache/oh-my-posh"
cp -R "/root/.cache/oh-my-posh/" "${_REMOTE_USER_HOME}/.cache/"
chmod 777 -R ${_REMOTE_USER_HOME}/.cache

# Can be used to override the devcontainer prompt default theme:
POSH_THEME="${_REMOTE_USER_HOME}/.cache/oh-my-posh/themes/${DEFAULTTEMPLATE}.omp.json"

# Copy the pwsh profile file, but replace the selected theme while doing that:
mkdir -p "${_REMOTE_USER_HOME}/.config/powershell"
awk "{gsub(/%POSHTHEMEFILE%/, \"${POSH_THEME}\")}1" < Microsoft.PowerShell_profile.ps1 > "${_REMOTE_USER_HOME}/.config/powershell/Microsoft.PowerShell_profile.ps1"

# make the .config folder and all files accessible (again)
chmod 777 -R "${_REMOTE_USER_HOME}/.config"

Microsoft.PowerShell_profile.ps1

# this file goes to .devcontainer/features/oh-my-posh/

Import-Module posh-git
Import-Module PSFzf -ArgumentList 'Ctrl+t', 'Ctrl+r'
Import-Module z
Import-Module Terminal-Icons

Set-PSReadlineKeyHandler -Key Tab -Function MenuComplete

$env:POSH_GIT_ENABLED=$true
$env:POSH_THEME_FILE="%POSHTHEMEFILE%"

oh-my-posh prompt init pwsh --config $env:POSH_THEME_FILE | Invoke-Expression