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Getting Started with GitHub

Currently GemStone2.4, PharoCore 1.3, PharoCore 1.4 and Squeak4.3 are supported.

  1. Set up git.
  2. Create a GitHub repository.
  3. Create filetree: packages directory
  4. Install Metacello
  5. Attach to git repository
  6. Create baseline
  7. Prime Metacello registry
  8. Saving your work
  9. Create configuration
  10. Git workflow

Create filetree: packages directory

Technically the FileTree packages repository can be located in the root of your git checkout, but I like to provide some initial structure to the git repository so there is room for adding artifacts (like documentation) in addition to the packages.

I start my projects with the following files and directories:

+-Sample
  +-docs
  |  +-README.md
  +-license.txt
  +-packages
  +-README.md

I put the Monticello packages in the packages directory.

Install Metacello

These expressions install the Metacello Preview and FileTree.

"Get the Metacello configuration"
Gofer new
  url: 'http://seaside.gemtalksystems.com/ss/metacello/';
  package: 'ConfigurationOfMetacello';
  load.

"Bootstrap Metacello Preview, using mcz files (#'previewBootstrap' symbolic version)"
((Smalltalk at: #ConfigurationOfMetacello) project 
  version: #'previewBootstrap') load.

"Load the Preview version of Metacello from GitHub"
(Smalltalk at: #Metacello) new
  configuration: 'MetacelloPreview';
  version: #stable;
  repository: 'github://dalehenrich/metacello-work:configuration';
  load.

For Squeak, you will want to use Installer to load the ConfigurationOfMetacello.

Attach to git repository

When you install FileTree, a new Monticello repository type, filetree: is added to the MonticelloBrowser menu. Selecting the filetree: menu item will bring up a directory selector. Select the directory in your git repository where you want the packages installed.

If you prefer you can execute the following:

| pathToPackageDirectory packageDirectory repo |
"edit to match the path to your chosen package directory"
pathToPackageDirectory := '/opt/git/Sample/packages'.
packageDirectory := FileDirectory on: pathToPackageDirectory.
"create a FileTree repository"
repo := MCFileTreeRepository new
    directory: packageDirectory.
"add repo to default repositories"
MCRepositoryGroup default addRepository: repo.
^repo

MCFileTreeRepository can be used anywhere that normal Monticello repositories can be used. I.e., you can copy packages into and out of an MCFileTreeRepository repository like any other repository.

Create baseline

During development phase of a project using a FileTree repository, you only need to create a baseline for your project.

Start by creating a subclass of BaselineOf:

BaselineOf subclass: #BaselineOfSample
  instanceVariableNames: ''
  classVariableNames: ''
  poolDictionaries: ''
  category: 'BaselineOfSample'

Next, you need to create a baseline: method.

If you've already got a configuration created for your project, you can use one of your baselineXXX: methods as a starting point and make the following edits:

  • make sure that the versionString: for each project is pointing at an explicit version.
  • remove the repository: statement. The baseline references the repository that it is loaded from.

If you don't have a configuration, here is a sample baseline:

baseline: spec
  <baseline>

  spec for: #common do: [
    spec configuration: 'Seaside30' with: [
      spec
        version: #stable;
        repository: 'http://www.squeaksource.com/MetacelloRepository' ].
    spec
      package: 'Sample-Core' with: [
        spec requires: 'Seaside30' ];
      package: 'Sample-Tests' with: [
        spec requires: 'Sample-Core' ]].

For more information about creating Metacello configurations, see the Metacello chapter of Pharo by Example.

After you've created the BaselineOf, save it into your project repository.

To use a BaselineOf in another configuration or baseline simply do this:

baseline: spec
  <baseline>

  spec for: #common do: [
    spec baseline: 'Sample' with: [
      repository: 'github://dalehenrich/Sample:master' ].
    spec package: 'OtherProject-Core with: [
      spec requires: 'Sample' ] ].

If your BaselineOf provides groups or multiple packages, you need to tell Metacello that it shouldn't complain about names it can not initially resolve. Names defined by a BaselineOf can only be resolved after it has been loaded, so Metacello needs to assume that unresolved names will be resolvable in the BaselineOf. Use the message #import: to do that:

baseline: spec
  <baseline>

  spec for: #common do: [
    spec baseline: 'Sample' with: [
      repository: 'github://dalehenrich/Sample:master' ].
    spec import: 'Sample'.
    spec package: 'OtherProject-Core with: [
      spec requires: 'default' ] ].

The #import: message has one drawback: if your configuration references multiple BaselineOf Metacello does not know with which one to resolve ambiguous names. Example:

baseline: spec
  <baseline>

  spec for: #common do: [
    "Sample defines the group 'default'"
    spec baseline: 'Sample' with: [
      repository: 'github://dalehenrich/Sample:master' ].
    spec import: 'Sample'.

    "OtherSample *also* defines the group 'default'"
    spec baseline: 'OtherSample' with: [
      repository: 'github://dalehenrich/Sample:master' ].
    spec import: 'OtherSample'.

    "'default' is now ambiguous"
    spec package: 'OtherProject-Core with: [
      spec requires: 'default' ] ].

To solve these ambiguities, newer versions of Metacello include the message #import:provides: which allows you to specify the explicit relationship:

baseline: spec
  <baseline>

  spec for: #common do: [
    "Sample defines the group 'default'"
    spec baseline: 'Sample' with: [
      repository: 'github://dalehenrich/Sample:master' ].
    spec import: 'Sample' provides: #('default').

    "OtherSample *also* defines the group 'default'"
    spec baseline: 'OtherSample' with: [
      repository: 'github://dalehenrich/Sample:master' ].
    spec import: 'OtherSample' provides: #('default').

    "'default' can now be successfully resolved, even though
    both projects define the same name"
    spec package: 'OtherProject-Core with: [
      spec requires: 'default' ] ].

Prime Metacello registry

You must do at least one fully-specified load of a project to make sure that the project is correctly registered in the Metacello Project Registry:

| pathToPackageDirectory |
"edit to match the path to your chosen package directory"
pathToPackageDirectory := '/opt/git/Sample/packages'.
Metacello new
  baseline: 'Sample';
  repository: 'filetree://', pathToPackageDirectory;
  load.

For GitHub repositories specifically you can use the following to fetch your project from GitHub:

| repositorySpec |
"edit to match your username, repository name and branch"
repositorySpec := 'dalehenrich/metacello-work:master'.
Metacello new
  baseline: 'Sample';
  repository: 'github://', repositorySpec;
  load.

For more information on the github://dalehenrich/sample:cecd1626d27f67175f22e6075ca2d1177da1d525/packages description see the section on github:// in the Metacello Scripting API reference.

Once you've done the first load, you can execute the following expressions to refresh the baseline and reload the project (useful if you've done a git checkout or pull):

Metacello image
  baseline: 'Sample';
  get;
  load.

Saving your work

When you've finished a unit of work, you need to perform the following steps to save your work to GitHub:

  1. Monticello commit from the MonticelloBrowser for each of your dirty packages.
  2. Git commit to save your work into your local git repository.
  3. Git push to share the work with your GitHub repository.

Note that I do a git commit after every Monticello commit, but I don't always do a git push after every git commit. The push is only necessary when I'm ready to share my work with others.

Create configuration

When you are ready to make a release of your project, you should create a configuration.

Start by creating a subclass of ConfigurationOf:

ConfigurationOf subclass: #ConfigurationOfSample
  instanceVariableNames: ''
  classVariableNames: ''
  poolDictionaries: ''
  category: 'ConfigurationOfSample'
version100: spec
    <version: '1.0.0'>
    spec
        for: #'common'
        do: [
            spec blessing: #'release'.
            spec description: 'a lot of cool stuff'.
            spec author: 'dkh'.
            spec timestamp: '7/30/2012 15:52'.
            spec
                baseline: 'Sample' with: [ spec repository: 'github://dalehenrich/sample:cecd1626d27f67175f22e6075ca2d1177da1d525/packages' ];
                import: 'Sample' ]

Note that you should only use this approach if you are sharing your configuration with folks who are participating in the Metacello Preview.

For more information on the github://dalehenrich/sample:cecd1626d27f67175f22e6075ca2d1177da1d525/packages description see the section on github:// in the Metacello Scripting API reference.

Git workflow

For the most part I tend to follow the GitHub Flow model. It is worth reading about git-flow.