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  • Book Overview & Buying Drush for Developers - Second Edition
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Drush for Developers - Second Edition

Drush for Developers - Second Edition

By : Juan Pablo Novillo Requena, Juan P Novillo Requena
4.5 (6)
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Drush for Developers - Second Edition

Drush for Developers - Second Edition

4.5 (6)
By: Juan Pablo Novillo Requena, Juan P Novillo Requena
Buy this Book

Overview of this book

This book is a best fit for backend developers with a basic knowledge of Drupal's APIs and some experience using the command line. Perhaps you already worked on one or two Drupal projects, but have never dived deep into Drush's toolset. In any case, this book will give you a lot of advice by covering real-world challenges in Drupal projects that can be solved using Drush.
Table of Contents (8 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Introduction, Installation, and Basic Usage
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1. Introduction, Installation, and Basic Usage
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Installation requirements
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The Drush command structure
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Understanding Drush's context system
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Setting the context manually
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Summary
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2. Keeping Database Configuration and Code Together
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2. Keeping Database Configuration and Code Together
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Meeting the update path
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Summary
3
3. Running and Monitoring Tasks in Drupal Projects
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3. Running and Monitoring Tasks in Drupal Projects
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Running periodic tasks with cron
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Running a task outside cron
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Running long tasks in batches
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Evaluating code on the fly and running scripts
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Logging messages in Drush
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Redirecting Drush output into a file
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Running a command in the background
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Summary
4
4. Error Handling and Debugging
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4. Error Handling and Debugging
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Validating input
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Rolling back when an error happens
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Browsing hook implementations
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Inspecting the bootstrapping process
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Inspecting hook and function implementations
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Summary
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5. Managing Local and Remote Environments
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5. Managing Local and Remote Environments
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Managing local environments
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Managing remote environments
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Special site aliases
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Adding site alias support to the update path
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Copying database and files between environments
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Summary
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6. Setting Up a Development Workflow
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6. Setting Up a Development Workflow
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Moving configuration, commands, and site aliases out of Drupal
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Configuring the development database for the team
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Running post sql-sync tasks in local environments
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Summary
7
Index
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Index

Rolling back when an error happens

When drush_set_error() is called during a command execution, the rollback mechanism jumps into action. The rollback mechanism gives us a chance to exit gracefully if something goes wrong. It is especially useful when we only want to perform a final action if a command is completed successfully. Drush itself uses the rollback mechanism when dealing with core and module upgrades, performing actions such as restoring original files back in place, and deleting the downloaded files of the new version if there is an error.

Here is the full sequence of invocations for a given command. In the following list, hook is the filename where the Drush command is implemented (excluding the .drush.inc extension) and COMMAND is the actual command name:

# 1.  hook_drush_init()
# 2.  drush_COMMAND_init()
# 3.  drush_hook_COMMAND_pre_validate()
# 4.  drush_hook_COMMAND_validate()
# 5.  drush_hook_pre_COMMAND()
# 6.  drush_hook_COMMAND()
# 7.  drush_hook_post_COMMAND()
# 8. hook_drush_exit...
CONTINUE READING
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Tech Concepts
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Programming languages
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Drush for Developers - Second Edition
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