The PowerShell gem.

This gem enables you to execute PowerShell from within ruby without having to instantiate and tear down a PowerShell process for each command called. It supports Windows PowerShell as well as PowerShell Core (and, soon, just PowerShell) - if you're running *PowerShell v3+, this gem supports you.

The Manager class enables you to execute and interoperate with PowerShell from within ruby, leveraging the strengths of both languages as needed.


Add this line to your application's Gemfile:

gem 'ruby-pwsh'

And then execute:

bundle install

Or install it yourself as:

gem install ruby-pwsh


Instantiating the manager can be done using some defaults:

# Instantiate the manager for Windows PowerShell, using the default path and arguments
# Note that this takes a few seconds to instantiate.
posh = Pwsh::Manager.instance(Pwsh::Manager.powershell_path, Pwsh::Manager.powershell_args)
# If you try to create another manager with the same arguments it will reuse the existing one.
ps = Pwsh::Manager.instance(Pwsh::Manager.powershell_path, Pwsh::Manager.powershell_args)
# Note that this time the return is very fast.
# We can also use the defaults for PowerShell Core, though these only work if PowerShell is
# installed to the default paths - if it is installed anywhere else, you'll need to specify
# the full path to the pwsh executable.
pwsh = Pwsh::Manager.instance(Pwsh::Manager.pwsh_path, Pwsh::Manager.pwsh_args)

Execution can be done with relatively little additional work - pass the command string you want executed:

# Instantiate the Manager:
posh = Pwsh::Manager.instance(Pwsh::Manager.powershell_path, Pwsh::Manager.powershell_args)
# Pretty print the output of `$PSVersionTable` to validate the version of PowerShell running
# Note that the output is a hash with a few different keys, including stdout.
# Lets reduce the noise a little and retrieve just the version number:
# Note: We cast to a string because PSVersion is actually a Version object.
# We could store this output to a ruby variable if we wanted, for further use:
ps_version = posh.execute('[String]$PSVersionTable.PSVersion')[:stdout].strip
pp("The PowerShell version of the currently running Manager is #{ps_version}")


You can find the full reference documentation online, here.

Releasing the Gem and Puppet Module

Steps to release an update to the gem and module include:

  1. Ensure that the release branch is up to date with the main: bash git push upstream upstream/main:release --force
  2. Checkout a new working branch for the release prep (where xyz is the appropriate version, sans periods): bash git checkout -b maint/release/prep-xyz upstream/release
  3. Update the version in lib/pwsh/version.rb and metadata.json to the appropriate version for the new release.
  4. Run the changelog update task (make sure to verify the changelog, correctly tagging PRs as needed): bash bundle exec rake changelog
  5. Commit your changes with a short, sensible commit message, like: text git add lib/pwsh/version.rb git add metadata.json git add git commit -m '(MAINT) Prep for x.y.z release'
  6. Push your changes and submit a pull request for review against the release branch: bash git push -u origin maint/release/prep-xyz
  7. Ensure tests pass and the code is merged to release.
  8. Grab the commit hash from the merge commit on release, use that as the tag for the version (replacing x.y.z with the appropriate version and commithash with the relevant one), then push the tags to upstream: bash bundle exec rake tag['x.y.z', 'commithash']
  9. Build the Ruby gem and publish: bash bundle exec rake build bundle exec rake push['ruby-pwsh-x.y.z.gem']
  10. Verify that the correct version now exists on RubyGems
  11. Build the Puppet module: bash bundle exec rake build_module
  12. Publish the updated module version (found in the pkg folder) to the Forge.
  13. Submit the mergeback PR from the release branch to main.

Known Issues

Supported Operating Systems

The following platforms are supported:

  • Windows
  • CentOS
  • Debian
  • Fedora
  • OSX
  • RedHat
  • Ubuntu