EnvCompare

Compare Heroku ENV variables across environments in an HTML table.

In a perfect world, you're using a platform or tool for managing your environment variables across Heroku environments. However, you may find the need to compare review app settings, staging, or even production environment variables

This gem helps pull down the environment variables and give you a little interface to view & compare them with (via a UI)

The heavy lifting is done via the heroku platform-api gem to retrieve environment variables, format them in an HTML page, and generate a small HTML file and open it with launchy

It automates a few things:

• Hides environment variables that match across all environments
• Puts them in alpha order

It's primarily intended to compare pre-production ENV variables across similar/identical environments

Installation

Prerequisites

# Install Heroku CLI
brew tap heroku/brew && brew install heroku

# Login with Heroku CLI
heroku login

# Install the heroku oauth plugin to generate an OAuth token
heroku plugins:install heroku-cli-oauth

# Create a token to access your applications
heroku authorizations:create -d "Platform API token for environment variables"

# Set the Token from above to an environment variable
export OAUTH_TOKEN=<token>

If you want to add the environment variable to your shell permanently, you can run a variation of the command below:

# Add permanently to `.bash_profile`
echo 'export OAUTH_TOKEN=<token>' >>~/.bash_profile

Install gem

gem install env_compare

After installation you should have access to the ec executable wrapper.

Usage

Use ec command to start comparing 2 or more heroku application environment variables.

When only one application name is specified, output is shown in cli. Otherwise, your default browser is launched.

Comparing environment variables

Show differences *default

ec diff heroku-app-name1 heroku-app-name2 heroku-app-name3

Show all

add --all option:

ec diff --all heroku-app-name1 heroku-app-name2 heroku-app-name3

Themes

• --theme dark default
• --theme light

For Example:

ec diff --theme light heroku-app-name1 heroku-app-name2

Updating environment variables across multiple apps

You can use ec update to set or clear an environment variable across multiple Heroku applications. This includes the options:

• --key= is required. The name of the Heroku environment variable you want to update.
• --value= is optional. The value of the environment variable you want to update. If not provided, will unset the environment variable.
• --force is a default option. Updates the environment variable, or adds it if not present. ** 0.1.3.pre.beta **
• --no-force is optional. Only update the environment variable if present in the application. ** 0.1.3.pre.beta **

Examples

Update an environment variable

ec update heroku-app-name1 heroku-app-name2 heroku-app-name3 --key=MY_KEY --value=asdf

Clear an environment variable

The default key value is nil; omit the --key argument if you want to clear an environment variable.

ec update heroku-app-name1 heroku-app-name2 heroku-app-name3 --key=MY_KEY

Development

To test this on your machine locally, after cloning the repo:

git clone https://github.com/jaydorsey/env_compare.git && cd env_compare
bundle
bundle exec ec diff heroku-app-name1 heroku-app-name2

You can also optionally build & install the gem locally to test:

rake build
gem install pkg/env_compare.<version_number>.gem

Then, use the ec command as normal.

Publishing the gem

If you have access to publish the gem on rubygems:

rake build
cd pkg
gem push env_compare.<version_number>.gem

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/jaydorsey/env_compare.