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pgxn utils

What is it?

It is a set of task that help developers to create PostgreSQL's extensions, putting the extension's files in the recomended places and supplying tasks to help bundle and release your extension to PGXN.

How to install it?

If you have pgxn client installed you can do:

pgxn install pgxn_utils

Or you can install it by rubygems:

gem install pgxn_utils

How it works?

It is all about tasks. Let's see them:

$ pgxn-utils help
Tasks:
  pgxn-utils bundle [extension_name]  # Bundles the extension in a zip file
  pgxn-utils change [extension_name]  # Changes META's attributes in current extension
  pgxn-utils help [TASK]              # Describe available tasks or one specific task
  pgxn-utils release filename         # Release an extension to PGXN
  pgxn-utils skeleton extension_name  # Creates an extension skeleton in current directory

Creating a new extension

$ pgxn-utils skeleton my_cool_extension
      create  my_cool_extension
      create  my_cool_extension/my_cool_extension.control
      create  my_cool_extension/.gitignore
      create  my_cool_extension/.template
      create  my_cool_extension/META.json
      create  my_cool_extension/Makefile
      create  my_cool_extension/README.md
      create  my_cool_extension/doc/my_cool_extension.md
      create  my_cool_extension/sql/my_cool_extension.sql
      create  my_cool_extension/sql/uninstall_my_cool_extension.sql
      create  my_cool_extension/test/expected/base.out
      create  my_cool_extension/test/sql/base.sql

Thats it! Just start coding! ":)

Git support

You can start a new extension with or without version control. By default pgxn-utils supports git but it will not create a repository unless you use --git option in the skeleton task.

$ pgxn-utils skeleton my_cool_versioned_extension --git
      create  my_cool_versioned_extension
      create  my_cool_versioned_extension/my_cool_versioned_extension.control
      create  my_cool_versioned_extension/.gitignore
      create  my_cool_versioned_extension/.template
      create  my_cool_versioned_extension/META.json
      create  my_cool_versioned_extension/Makefile
      create  my_cool_versioned_extension/README.md
      create  my_cool_versioned_extension/doc/my_cool_versioned_extension.md
      create  my_cool_versioned_extension/sql/my_cool_versioned_extension.sql
      create  my_cool_versioned_extension/sql/uninstall_my_cool_versioned_extension.sql
      create  my_cool_versioned_extension/test/expected/base.out
      create  my_cool_versioned_extension/test/sql/base.sql
        init  /tmp/my_cool_versioned_extension
      commit  initial commit

When you create a new extension with git support in addition to create skeleton, pgxn-utils will initialize a git repository and create the initial commit.

Once you have your extension in a git repository your bundle will use only the commited files to create the archive, but if your repository is dirty then pgxn-utils will hint you to commit or stash your changes, before bundle.

You must be careful with new files not added to repository, because they will NOT be archived.

Default templates

pgxn-utils has three templates: sql, c and fdw. If you call skeleton without specifying a template the sql is the default. But if your extension will supply some C modules or you will create a FDW, you can create the extension calling skeleton with a --template option.

$ pgxn-utils skeleton my_cool_c_extension --template=c
      create  my_cool_c_extension
      create  my_cool_c_extension/my_cool_c_extension.control
      create  my_cool_c_extension/.gitignore
      create  my_cool_c_extension/.template
      create  my_cool_c_extension/META.json
      create  my_cool_c_extension/Makefile
      create  my_cool_c_extension/README.md
      create  my_cool_c_extension/doc/my_cool_c_extension.md
      create  my_cool_c_extension/sql/my_cool_c_extension.sql
      create  my_cool_c_extension/sql/uninstall_my_cool_c_extension.sql
      create  my_cool_c_extension/src/my_cool_c_extension.c
      create  my_cool_c_extension/test/expected/base.out
      create  my_cool_c_extension/test/sql/base.sql



$ pgxn-utils skeleton my_cool_fdw_extension --template=fdw
      create  my_cool_fdw_extension
      create  my_cool_fdw_extension/my_cool_fdw_extension.control
      create  my_cool_fdw_extension/.gitignore
      create  my_cool_fdw_extension/.template
      create  my_cool_fdw_extension/META.json
      create  my_cool_fdw_extension/Makefile
      create  my_cool_fdw_extension/README.md
      create  my_cool_fdw_extension/doc/my_cool_fdw_extension.md
      create  my_cool_fdw_extension/sql/my_cool_fdw_extension.sql
      create  my_cool_fdw_extension/sql/uninstall_my_cool_fdw_extension.sql
      create  my_cool_fdw_extension/src/my_cool_fdw_extension_fdw.c
      create  my_cool_fdw_extension/test/expected/base.out
      create  my_cool_fdw_extension/test/sql/base.sql

The templates contains examples codes and some links to PostgreSQL documentation that will try to help you to start coding. SQL and C templates contains some tests examples, and the example code will compiles and pass make installcheck, but they are examples and you must write your own tests and code.

Custom templates

If you don't like the templates provided by pgxn-utils you can create you own templates. Just create a directory where you want with at least a META.json or META.json.tt file then you can use your directory as argument to the --template option.

To see how create your own template, you can use, as example, the templates directory.

Changing something

Well suppose you want to change the default maintainer's name and the license, just do:

$ pgxn-utils change my_cool_extension --maintainer "Dickson Guedes" --license bsd
    conflict  META.json
Overwrite /tmp/my_cool_extension/META.json? (enter "h" for help) [Ynaqdh]
{
     "name": "my_cool_extension",
     "abstract": "A short description",
     "description": "A long description",
     "version": "0.0.1",
-    "maintainer": "The maintainer's name",
+    "maintainer": "Dickson Guedes",
-    "license": "postgresql",
+    "license": "bsd",
     "provides": {
        "my_cool_extension": {
           "abstract": "A short description",
           "file": "sql/my_cool_extension.sql",
           "docfile": "doc/my_cool_extension.md",
           "version": "0.0.1"
        }
     },
     "release_status": "unstable",

     "generated_by": "The maintainer's name",


     "meta-spec": {
        "version": "1.0.0",
        "url": "http://pgxn.org/meta/spec.txt"
     }
  }
Retrying...
Overwrite /tmp/my_cool_extension/META.json? (enter "h" for help) [Ynaqdh]
       force  META.json
   identical  my_cool_extension.control

It will wait until you decide what to do.

For all switches that you can use with change, type:

$ pgxn-utils help change
Usage:
  pgxn-utils change [extension_name]

Options:
  -p, [--target=TARGET]                  # Define the target directory
                                         # Default: .
  -m, [--maintainer=MAINTAINER]          # Maintainer's name <maintainer@email>
  -a, [--abstract=ABSTRACT]              # Defines a short description to abstract
  -l, [--license=LICENSE]                # The extension license.
  -v, [--version=VERSION]                # Initial version
  -d, [--description=DESCRIPTION]        # A long text that contains more information about extension
  -b, [--generated-by=GENERATED_BY]      # Name of extension's generator
  -t, [--tags=one two three]             # Defines extension's tags
  -r, [--release-status=RELEASE_STATUS]  # Initial extension's release status

Changes META's attributes in current extension

Bundling and Releasing!

Well, since you finished your work you can bundle it to send to PGXN. Note that if you have your extension in a git repository bundle will use only the commited files to create the archive, but if your repository is dirty then pgxn-utils will hint you to commit or stash your changes, before bundle.

Let's bundle it:

$ pgxn-utils bundle my_cool_extension
         create /home/guedes/extensions/my_cool_extension-0.0.1.zip

and release it:

$ pgxn-utils release my_cool_extension-0.0.1.zip
Enter your PGXN username: guedes
Enter your PGXN password: ******
Trying to release my_cool_extension-0.0.1.zip ... released successfully!
Visit: https://manager.pgxn.org/distributions/my_cool_extension/0.0.1

You can export PGXN_USER and PGXN_PASSWORD environment variables to avoid type username and password everytime.

Working in progress

  • improve git support
  • proxy support
  • custom templates

Copyright and License

Copyright (c) 2011 Dickson S. Guedes.

This module is free software; you can redistribute it and/or modify it under the PostgreSQL License.

Permission to use, copy, modify, and distribute this software and its documentation for any purpose, without fee, and without a written agreement is hereby granted, provided that the above copyright notice and this paragraph and the following two paragraphs appear in all copies.

In no event shall Dickson S. Guedes be liable to any party for direct, indirect, special, incidental, or consequential damages, including lost profits, arising out of the use of this software and its documentation, even if Dickson S. Guedes has been advised of the possibility of such damage.

Dickson S. Guedes specifically disclaims any warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. The software provided hereunder is on an "as is" basis, and Dickson S. Guedes has no obligations to provide maintenance, support, updates, enhancements, or modifications.

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