370 lines
8.6 KiB
Markdown
370 lines
8.6 KiB
Markdown
---
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comments: false
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---
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# Training
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This training material is the markdown used to generate training slides
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which can be found at [End User Slides](https://gitlab-org.gitlab.io/end-user-training-slides/#/)
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through it's [RevealJS](https://gitlab.com/gitlab-org/end-user-training-slides)
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project.
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## Git Intro
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### What is a Version Control System (VCS)
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- Records changes to a file
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- Maintains history of changes
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- Disaster Recovery
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- Types of VCS: Local, Centralized and Distributed
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### Short Story of Git
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- 1991-2002: The Linux kernel was being maintained by sharing archived files
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and patches.
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- 2002: The Linux kernel project began using a DVCS called BitKeeper
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- 2005: BitKeeper revoked the free-of-charge status and Git was created
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### What is Git
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- Distributed Version Control System
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- Great branching model that adapts well to most workflows
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- Fast and reliable
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- Keeps a complete history
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- Disaster recovery friendly
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- Open Source
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### Getting 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 (i.e. StackOverflow, Google groups)
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- Read documentation at <https://git-scm.com>
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## Git Setup
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Workshop Time!
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### Setup
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- Windows: Install 'Git for Windows'
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- <https://git-for-windows.github.io>
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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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- Linux
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- Debian: `sudo apt-get install git-all`
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- Red Hat `sudo yum install git-all`
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### Configure
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- One-time configuration of the Git client:
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```bash
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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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- If you don't use the global flag you can set up a different author for
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each project
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- Check settings with:
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```bash
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git config --global --list
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```
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- You might want or be required to use an SSH key.
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- Instructions: [SSH](http://doc.gitlab.com/ce/ssh/README.html)
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### Workspace
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- Choose a directory on you machine easy to access
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- Create a workspace or development directory
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- This is where we'll be working and adding content
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```bash
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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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```
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## Git Basics
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### Git Workflow
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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 (Workspace)
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- Files that have been modified but are not committed.
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- Staging area (Index)
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- Modified files that have been marked to go in the next commit.
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- Upstream
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- Hosted repository on a shared server
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### GitLab
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- GitLab is an application to code, test and deploy.
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- Provides repository management with access controls, code reviews,
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issue tracking, Merge Requests, and other features.
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- The hosted version of GitLab is gitlab.com
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### New Project
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- Sign in into your gitlab.com account
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- Create a project
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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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- On your machine clone the `training-examples` project
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### Git and GitLab basics
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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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```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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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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```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 Request
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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 request example
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- Create your first merge request
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- Use the blue button in the activity feed
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- View the diff (changes) and leave a comment
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- Push a new commit to the same branch
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- 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
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---
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- Review the Thoughtbot code-review guide for suggestions to follow when reviewing merge requests:
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[Thoughtbot](https://github.com/thoughtbot/guides/tree/master/code-review)
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- See GitLab merge requests for examples: [Merge Requests](https://gitlab.com/gitlab-org/gitlab-foss/merge_requests)
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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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### Example Plan
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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 and watch it fail
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1. Rebase our new branch with master
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1. Fix conflicts on the conflicts.rb file.
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1. Stage the file and continue rebasing
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1. Force push the changes
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1. Finally continue with the Merge Request
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### Example 1/2
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```sh
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git checkout -b conflicts_branch
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# vi conflicts.rb
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# Add 'Line4' and 'Line5'
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git commit -am "add line4 and line5"
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git push origin conflicts_branch
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git checkout master
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# vi conflicts.rb
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# Add 'Line6' and 'Line7'
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git commit -am "add line6 and line7"
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git push origin master
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```
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### Example 2/2
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Create a merge request on the GitLab web UI. You'll see a conflict warning.
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```sh
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git checkout conflicts_branch
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git fetch
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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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# No need to commit this file
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git rebase --continue
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# Remember that we have rewritten our commit history so we
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# need to force push so that our remote branch is restructured
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git push origin conflicts_branch -f
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```
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### Notes
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- When to use `git merge` and when to use `git rebase`
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- Rebase when updating your branch with master
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- Merge when bringing changes from feature to master
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- Reference: <https://www.atlassian.com/git/tutorials/merging-vs-rebasing/>
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## Revert and Unstage
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### Unstage
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To remove files from stage use reset HEAD. Where HEAD is the last commit of the current branch:
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```sh
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git reset HEAD <file>
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```
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This will unstage the file but maintain the modifications. To revert the file back to the state it was in before the changes we can use:
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```sh
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git checkout -- <file>
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```
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To remove a file from disk and repo use 'git rm' and to rm a dir use the '-r' flag:
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```sh
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git rm '*.txt'
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git rm -r <dirname>
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```
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If we want to remove a file from the repository but keep it on disk, say we forgot to add it to our .gitignore file then use `--cache`:
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```sh
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git rm <filename> --cache
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```
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### Undo Commits
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Undo last commit putting everything back into the staging area:
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```sh
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git reset --soft HEAD^
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```
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Add files and change message with:
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```sh
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git commit --amend -m "New Message"
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```
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Undo last and remove changes
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```sh
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git reset --hard HEAD^
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```
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Same as last one but for two commits back:
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```sh
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git reset --hard HEAD^^
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```
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Don't reset after pushing
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### Reset Workflow
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1. Edit file again 'edit_this_file.rb'
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1. Check status
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1. Add and commit with wrong message
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1. Check log
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1. Amend commit
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1. Check log
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1. Soft reset
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1. Check log
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1. Pull for updates
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1. Push changes
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```sh
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# Change file edit_this_file.rb
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git status
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git commit -am "kjkfjkg"
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git log
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git commit --amend -m "New comment added"
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git log
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git reset --soft HEAD^
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git log
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git pull origin master
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git push origin master
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```
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### git revert vs git reset
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Reset removes the commit while revert removes the changes but leaves the commit
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Revert is safer considering we can revert a revert
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```sh
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# Changed file
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git commit -am "bug introduced"
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git revert HEAD
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# New commit created reverting changes
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# Now we want to re apply the reverted commit
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git log # take hash from the revert commit
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git revert <rev commit hash>
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# reverted commit is back (new commit created again)
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```
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## Questions
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## Instructor Notes
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### Version Control
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- Local VCS was used with a filesystem or a simple db.
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- Centralized VCS such as Subversion includes collaboration but
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still is prone to data loss as the main server is the single point of
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failure.
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- Distributed VCS enables the team to have a complete copy of the project
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and work with little dependency to the main server. In case of a main
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server failing the project can be recovered by any of the latest copies
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from the team
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