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Branching and merging

From: Fundamentals of Software Version Control

Video: Branching and merging

Let's explore branching and merging in Hg. In Hg, branching and merging is very easy. First, let's run hg branch and see that there is only one branch default, and that's the one we're on. Sometimes it's called the trunk. But in Hg, it's called the default. So to create a branch, we say hg branch b1. Now notice it says mark the working directory as branch b1. It hasn't actually done the branch yet, so we have to commit it to make the branch. Okay, now if we say hg branch, you can see we're on branch b1, and if we see hg branches, you can see there are two branches, b1 and default.

Branching and merging

Let's explore branching and merging in Hg. In Hg, branching and merging is very easy. First, let's run hg branch and see that there is only one branch default, and that's the one we're on. Sometimes it's called the trunk. But in Hg, it's called the default. So to create a branch, we say hg branch b1. Now notice it says mark the working directory as branch b1. It hasn't actually done the branch yet, so we have to commit it to make the branch. Okay, now if we say hg branch, you can see we're on branch b1, and if we see hg branches, you can see there are two branches, b1 and default.

Now to work with a branch we simply update to the branch, hg update b1, and we ask hg branch it tells we're on b1, and if we say hg update default and we type hg branch, we're back on the default branch. So let's go back to branch b1 and make a change. So we'll add another feature to our little haiku up here "No more available space," "Look to the cloud," "Your hard drive is full!" Now if we save this and commit it--and remember now we can say hg branch--and see that we're in branch b1, type out f1.c, and see that we've got the new feature. If we go hg update default, type out the f1.c, you see we just have the original values.

I'll go back to the branch, I will look at the log, and you can see that it shows us in the list which branch it was in. So it was in branch b1 that we did the update. Like Git, however, it's a good convention in your summary to indicate which branch the changes are in. So now we're going to go make one other update, and we're going to change website to node and then we'll commit that, and we'll put the branch number in front of it, so we know exactly where we did, what we did.

All right, so now let's talk a little bit about merging. If you continue to work in a branch for an extended period of time, you'll want to do a forward integration from the default back to your private branch. Remember back in the conceptual section we talked about forward integration and reverse integration? Forward integration is that process of taking things from the main or the trunk or the default and moving them into your private branch. The purpose of doing this is to make sure that your private branch doesn't get too far out of date with the main, if you have other people working on the main branch so that you're collecting together updates perhaps in sections of the application that are different than the one you are working in.

Now in this case, we don't have anything useful in our main branch to bring forward, so we're just going to do a reverse integration. Remember, a reverse integration is taking changes from our private branch and putting them back in the main. In order to merge, we need to switch back to the master branch or the default branch. So we're going to say hg update default, we can see we just have our original data, and then we're going to ask it to merge branch b1 get back into the default branch. And notice it says here, again, branch merge, don't forget to commit.

If we see hg status, you can see that not only does it have modified file f1. It also has this file it doesn't know what to do with code f1.c.orig, and you should just leave that alone, and in this case, we're going to do the commit, and if we do hg log, you can see that now we have our updated from branch b1, and that's it. Now we type f1.c, you can see we have all our changes from the branch merged back into the default, we can verify when the default branch by saying hg branch and see that we're in the default branch.

So that's branching and merging in Hg. Next step, we'll take a quick look at looking at GUI tools and shell integration for Hg.

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This video is part of

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Fundamentals of Software Version Control

49 video lessons · 11549 viewers

Michael Lehman
Author

 
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  1. 2m 12s
    1. Welcome
      56s
    2. What you should know before taking this course
      23s
    3. Using the exercise files
      53s
  2. 25m 8s
    1. Overview of software version control
      2m 51s
    2. Understanding version control concepts
      5m 14s
    3. Demo one: Getting started
      11m 1s
    4. Demo two: Handling the "oops"
      6m 2s
  3. 11m 3s
    1. The history of version control
      3m 44s
    2. Terminology
      4m 27s
    3. Exploring centralized vs. distributed systems
      2m 52s
  4. 28m 42s
    1. Getting files in and out of a repository
      4m 38s
    2. Saving changes and tracking history
      2m 47s
    3. Reverting to a prior version
      1m 42s
    4. Creating tags and labels
      1m 5s
    5. Branching and merging
      4m 10s
    6. Exploring workflow integration and continuous builds
      2m 46s
    7. Using graphical user interface (GUI) tools
      2m 39s
    8. Integrating a version control system with an integrated development environment (IDE)
      2m 50s
    9. Examining shell integration
      3m 26s
    10. Looking at forward and reverse integration
      2m 39s
  5. 25m 59s
    1. Installation and setup
      3m 31s
    2. Creating a repository and a project
      5m 10s
    3. Working with check-in, checkout, and revert
      6m 12s
    4. Tagging
      1m 34s
    5. Branching and merging
      5m 32s
    6. Working with GUI clients and IDE integration
      4m 0s
  6. 16m 13s
    1. Installation and setup
      55s
    2. Working with check-in, checkout, and revert
      9m 34s
    3. Tagging
      1m 7s
    4. Branching and merging
      4m 37s
  7. 26m 41s
    1. Installation and setup
      3m 47s
    2. Creating a repository and a project
      6m 15s
    3. Working with check-in, checkout, and revert
      8m 31s
    4. Tracking history and tagging
      2m 15s
    5. Branching and merging
      5m 53s
  8. 19m 25s
    1. Installation and setup
      3m 1s
    2. Creating a repository and a project
      1m 6s
    3. Working with check-in, checkout, and revert
      6m 39s
    4. Tagging
      2m 13s
    5. Branching and merging
      3m 44s
    6. Working with GUI clients and IDE integration
      2m 42s
  9. 16m 54s
    1. Installation and setup
      1m 48s
    2. Creating a repository and a project
      59s
    3. Working with check-in, checkout, revert, and tracking history
      6m 9s
    4. Tagging
      1m 50s
    5. Branching and merging
      4m 29s
    6. Exploring GUI and shell integration
      1m 39s
  10. 3m 38s
    1. Selecting a software version control that is right for you
      2m 30s
    2. Next steps
      1m 8s

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