339 lines
7.7 KiB
Markdown
339 lines
7.7 KiB
Markdown
---
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comments: false
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type: reference
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---
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# GitLab Git Workshop
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## Agenda
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1. Brief history of Git.
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1. GitLab walkthrough.
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1. Configure your environment.
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1. Workshop.
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## Git introduction
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<https://git-scm.com/about>
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- Distributed version control.
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- Does not rely on connection to a central server.
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- Many copies of the complete history.
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- Powerful branching and merging.
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- Adapts to nearly any workflow.
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- Fast, reliable and stable file format.
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## Help
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Use the tools at your disposal when you get stuck.
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- Use '`git help <command>`' command.
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- Use Google.
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- Read documentation at <https://git-scm.com>.
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## GitLab Walkthrough
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## Configure your environment
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- Windows: Install 'Git for Windows'
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> <https://gitforwindows.org>
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- Mac: Type '`git`' in the Terminal application.
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> If it's not installed, it will prompt you to install it.
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- Debian: '`sudo apt-get install git-all`' or Red Hat '`sudo yum install git-all`'
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## Git Workshop
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### Overview
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1. Configure Git.
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1. Configure SSH Key.
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1. Create a project.
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1. Committing.
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1. Feature branching.
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1. Merge requests.
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1. Feedback and Collaboration.
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## Configure Git
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One-time configuration of the Git client:
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```shell
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git config --global user.name "Your Name"
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git config --global user.email you@example.com
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```
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## Configure SSH Key
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```shell
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ssh-keygen -t rsa -b 4096 -C "you@computer-name"
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```
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```shell
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# You will be prompted for the following information. Press enter to accept the defaults. Defaults appear in parentheses.
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Generating public/private rsa key pair.
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Enter file in which to save the key (/Users/you/.ssh/id_rsa):
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Enter passphrase (empty for no passphrase):
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Enter same passphrase again:
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Your identification has been saved in /Users/you/.ssh/id_rsa.
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Your public key has been saved in /Users/you/.ssh/id_rsa.pub.
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The key fingerprint is:
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39:fc:ce:94:f4:09:13:95:64:9a:65:c1:de:05:4d:01 you@computer-name
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```
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Copy your public key and add it to your GitLab profile:
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```shell
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cat ~/.ssh/id_rsa.pub
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```
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```shell
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ssh-rsa AAAAB3NzaC1yc2EAAAADAQEL17Ufacg8cDhlQMS5NhV8z3GHZdhCrZbl4gz you@example.com
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```
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## Create a project
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- Create a project in your user namespace.
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- Choose to import from 'Any Repo by URL' and use <https://gitlab.com/gitlab-org/training-examples.git>.
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- Create a '`development`' or '`workspace`' directory in your home directory.
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- Clone the '`training-examples`' project.
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## Commands (project)
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```shell
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mkdir ~/development
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cd ~/development
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-or-
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mkdir ~/workspace
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cd ~/workspace
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git clone git@gitlab.example.com:<username>/training-examples.git
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cd training-examples
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```
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## Git concepts
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### Untracked files
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New files that Git has not been told to track previously.
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### Working area
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Files that have been modified but are not committed.
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### Staging area
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Modified files that have been marked to go in the next commit.
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## Committing
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1. Edit '`edit_this_file.rb`' in '`training-examples`'.
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1. See it listed as a changed file (working area).
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1. View the differences.
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1. Stage the file.
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1. Commit.
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1. Push the commit to the remote.
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1. View the Git log.
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## Commands (committing)
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```shell
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# Edit `edit_this_file.rb`
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git status
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git diff
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git add <file>
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git commit -m 'My change'
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git push origin master
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git log
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```
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## Feature branching
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- Efficient parallel workflow for teams.
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- Develop each feature in a branch.
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- Keeps changes isolated.
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- Consider a 1-to-1 link to issues.
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- Push branches to the server frequently.
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- Hint: This is a cheap backup for your work-in-progress code.
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## Feature branching steps
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1. Create a new feature branch called 'squash_some_bugs'.
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1. Edit '`bugs.rb`' and remove all the bugs.
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1. Commit.
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1. Push.
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## Commands (feature branching)
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```shell
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git checkout -b squash_some_bugs
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# Edit `bugs.rb`
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git status
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git add bugs.rb
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git commit -m 'Fix some buggy code'
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git push origin squash_some_bugs
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```
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## Merge requests
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- When you want feedback create a merge request.
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- Target is the ‘default’ branch (usually master).
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- Assign or mention the person you would like to review.
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- Add 'WIP' to the title if it's a work in progress.
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- When accepting, always delete the branch.
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- Anyone can comment, not just the assignee.
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- Push corrections to the same branch.
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## Merge requests steps
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Create your first merge request:
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1. Use the blue button in the activity feed.
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1. View the diff (changes) and leave a comment.
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1. Push a new commit to the same branch.
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1. Review the changes again and notice the update.
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## Feedback and Collaboration
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- Merge requests are a time for feedback and collaboration.
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- Giving feedback is hard.
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- Be as kind as possible.
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- Receiving feedback is hard.
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- Be as receptive as possible.
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- Feedback is about the best code, not the person. You are not your code.
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## Feedback and Collaboration resources
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Review the Thoughtbot code-review guide for suggestions to follow when reviewing merge requests:
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<https://github.com/thoughtbot/guides/tree/master/code-review>.
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See GitLab merge requests for examples: <https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests>.
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## Explore GitLab projects
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- Dashboard
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- User Preferences
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- ReadMe, Changelog, License shortcuts
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- Issues
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- Milestones and Labels
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- Manage project members
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- Project settings
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## Tags
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- Useful for marking deployments and releases.
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- Annotated tags are an unchangeable part of Git history.
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- Soft/lightweight tags can be set and removed at will.
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- Many projects combine an annotated release tag with a stable branch.
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- Consider setting deployment/release tags automatically.
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## Tags steps
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1. Create a lightweight tag.
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1. Create an annotated tag.
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1. Push the tags to the remote repository.
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Additional resources: <https://git-scm.com/book/en/v2/Git-Basics-Tagging>.
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## Commands (tags)
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```shell
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git checkout master
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# Lightweight tag
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git tag my_lightweight_tag
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# Annotated tag
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git tag -a v1.0 -m ‘Version 1.0’
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git tag
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git push origin --tags
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```
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## Merge conflicts
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- Happen often.
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- Learning to fix conflicts is hard.
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- Practice makes perfect.
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- Force push after fixing conflicts. Be careful!
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## Merge conflicts steps
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1. Checkout a new branch and edit `conflicts.rb`. Add 'Line4' and 'Line5'.
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1. Commit and push.
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1. Checkout master and edit `conflicts.rb`. Add 'Line6' and 'Line7' below 'Line3'.
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1. Commit and push to master.
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1. Create a merge request.
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## Merge conflicts commands
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After creating a merge request you should notice that conflicts exist. Resolve
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the conflicts locally by rebasing.
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```shell
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git rebase master
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# Fix conflicts by editing the files.
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git add conflicts.rb
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git commit -m 'Fix conflicts'
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git rebase --continue
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git push origin <branch> -f
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```
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## Rebase with squash
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You may end up with a commit log that looks like this:
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```
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Fix issue #13
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Test
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Fix
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Fix again
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Test
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Test again
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Does this work?
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```
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Squash these in to meaningful commits using an interactive rebase.
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## Rebase with squash commands
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Squash the commits on the same branch we used for the merge conflicts step.
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```shell
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git rebase -i master
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```
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In the editor, leave the first commit as 'pick' and set others to 'fixup'.
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## Questions?
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Thank you for your hard work!
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## Additional Resources
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See [additional resources](index.md#additional-resources).
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<!-- ## Troubleshooting
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Include any troubleshooting steps that you can foresee. If you know beforehand what issues
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one might have when setting this up, or when something is changed, or on upgrading, it's
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important to describe those, too. Think of things that may go wrong and include them here.
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This is important to minimize requests for support, and to avoid doc comments with
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questions that you know someone might ask.
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Each scenario can be a third-level heading, e.g. `### Getting error message X`.
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If you have none to add when creating a doc, leave this section in place
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but commented out to help encourage others to add to it in the future. -->
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