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  • Book Overview & Buying Git Version Control Cookbook
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Git Version Control Cookbook

Git Version Control Cookbook

By : Olsson, Voss
4 (3)
Buy this Book
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Git Version Control Cookbook

Git Version Control Cookbook

4 (3)
By: Olsson, Voss
Buy this Book

Overview of this book

This practical guide contains a wide variety of recipes, taking you through all the topics you need to know about to fully utilize the most advanced features of the Git system. If you are a software developer or a build and release engineer who uses Git in your daily work and want to take your Git knowledge to the next level, then this book is for you. To understand and follow the recipes included in this book, basic knowledge of Git command-line code is mandatory.
Table of Contents (14 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
Free Chapter
1
1. Navigating Git
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1. Navigating Git
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Introduction
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Git's objects
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The three stages
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Viewing the DAG
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Extracting fixed issues
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Getting a list of the changed files
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Viewing history with Gitk
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Finding commits in history
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Searching through history code
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2. Configuration
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2. Configuration
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Configuration targets
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Querying the existing configuration
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Templates
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A .git directory template
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A few configuration examples
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Git aliases
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The refspec exemplified
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3. Branching, Merging, and Options
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3. Branching, Merging, and Options
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Introduction
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Managing your local branches
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Branches with remotes
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Forcing a merge commit
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Using git rerere to merge known conflicts
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The difference between branches
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4. Rebase Regularly and Interactively, and Other Use Cases
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4. Rebase Regularly and Interactively, and Other Use Cases
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Introduction
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Rebasing commits to another branch
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Continuing a rebase with merge conflicts
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Rebasing selective commits interactively
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Squashing commits using an interactive rebase
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Changing the author of commits using a rebase
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Auto-squashing commits
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5. Storing Additional Information in Your Repository
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5. Storing Additional Information in Your Repository
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Introduction
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Adding your first Git note
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Separating notes by category
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Retrieving notes from the remote repository
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Pushing notes to a remote repository
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Tagging commits in the repository
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6. Extracting Data from the Repository
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6. Extracting Data from the Repository
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Introduction
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Extracting the top contributor
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Finding bottlenecks in the source tree
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Grepping the commit messages
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The contents of the releases
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7. Enhancing Your Daily Work with Git Hooks, Aliases, and Scripts
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7. Enhancing Your Daily Work with Git Hooks, Aliases, and Scripts
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Introduction
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Using a branch description in the commit message
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Creating a dynamic commit message template
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Using external information in the commit message
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Preventing the push of specific commits
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Configuring and using Git aliases
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Configuring and using Git scripts
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Setting up and using a commit template
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8. Recovering from Mistakes
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8. Recovering from Mistakes
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Introduction
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Undo – remove a commit completely
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Undo – remove a commit and retain the changes to files
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Undo – remove a commit and retain the changes in the staging area
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Undo – working with a dirty area
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Redo – recreate the latest commit with new changes
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Revert – undo the changes introduced by a commit
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Reverting a merge
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Viewing past Git actions with git reflog
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Finding lost changes with git fsck
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9. Repository Maintenance
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9. Repository Maintenance
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Introduction
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Pruning remote branches
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Running garbage collection manually
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Turning off automatic garbage collection
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Splitting a repository
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Rewriting history – changing a single file
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Back up your repositories as mirror repositories
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A quick submodule how-to
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Subtree merging
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Submodule versus subtree merging
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10. Patching and Offline Sharing
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10. Patching and Offline Sharing
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Introduction
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Creating patches
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Creating patches from branches
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Applying patches
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Sending patches
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Creating Git bundles
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Using a Git bundle
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Creating archives from a tree
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11. Git Plumbing and Attributes
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11. Git Plumbing and Attributes
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Introduction
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Displaying the repository information
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Displaying the tree information
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Displaying the file information
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Writing a blob object to the database
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Writing a tree object to the database
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Writing a commit object to the database
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Keyword expansion with attribute filters
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Metadata diff of binary files
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Storing binaries elsewhere
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Checking the attributes of a file
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Attributes to export an archive
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12. Tips and Tricks
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12. Tips and Tricks
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Introduction
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Using git stash
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Saving and applying stashes
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Debugging with git bisect
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Using the blame command
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Color UI in the prompt
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Autocompletion
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Bash prompt with status information
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More aliases
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Interactive add
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Interactive add with Git GUI
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Ignoring files
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Showing and cleaning ignored files
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Index
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Index

Rewriting history – changing a single file

In this example, we'll see how we can use Git filter-branch to remove sensitive data from a file throughout the repository history.

Getting ready

For simplicity, we'll use a very simple example repository. It contains a few files. One among them is .credentials, which contains a username and password. Start by cloning the repository and changing the directory, as shown in the following command:

$ git clone https://github.com/dvaske/remove-credentials.git
$ cd remove-credentials

How to do it...

  1. As we need to modify a file when rewriting the history of this repository, we'll use the tree-filter option to filter branch. The .credentials file looks as follows:

    username = foobar
password = verysecret

  2. All we need to do is to remove everything after the equals sign on each line of the file. We can use the following sed command to do this:

    sed -i '' 's/^\(.*=\).*$/\1/'

  3. We can now run the filter branch with the following command:

    $ git filter-branch --prune...

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