Upload
abraham-mathews
View
213
Download
0
Embed Size (px)
Citation preview
Git
A distributed version control system
Powerpoint credited to University of PA
And modified by Pepper
Apr 21, 2023
Version control systems
Version control (or revision control, or source control) is all about managing multiple versions of documents, programs, web sites, etc.
Almost all “real” projects use some kind of version control Essential for team projects, but also very useful for individual projects
Some well-known version control systems are CVS, Subversion, Mercurial, and Git
CVS and Subversion use a “central” repository; users “check out” files, work on them, and “check them in”
Mercurial and Git treat all repositories as equal
Distributed systems like Mercurial and Git are newer and are gradually replacing centralized systems like CVS and Subversion
2
Why version control?
For working by yourself: Gives you a “time machine” for going back to earlier versions Gives you great support for different versions (standalone,
web app, etc.) of the same basic project For working with others:
Greatly simplifies concurrent work, merging changes For getting an internship or job:
Any company with a clue uses some kind of version control Companies without a clue are bad places to work
3
Download and install Git
There are online materials that are better than any that I could provide
Standard one: http://git-scm.com/downloads Here’s one from StackExchange:
http://stackoverflow.com/questions/315911/git-for-beginners-the-definitive-practical-guide#323764
Install Git on your machine from http://git-scm.com/downloads Accept context menu items
Git access: Right click from windows explorer gitBash to enter commands
4
Introduce yourself to Git
Start git / gitBash Enter these lines (with appropriate changes):
git config --global user.name "John Smith" git config --global user.email [email protected]
You only need to do this once
If you want to use a different name/email address for a particular project, you can change it for just that project cd to the project directory Use the above commands, but leave out the --global
5
Choose an editor
When you “commit,” git will require you to type in a commit message
For longer commit messages, you will use an editor The default editor is probably vim To change the default editor:
git config --global core.editor /usr/bin/vim
You may also want to turn on colors: git config --global color.ui auto
See your options: git config -l
6
Your repositories
We have created 6 class repositories on panther, and here are their paths.
ssh://[email protected]/opt/git/csc271books.git ssh://[email protected]/opt/git/csc271tv.git ssh://[email protected]/opt/git/csc271store.git ssh://[email protected]/opt/git/csc271movies1.git ssh://[email protected]/opt/git/csc271games1.git ssh://[email protected]/opt/git/csc271movies2.git Prior class: csc440Spring14r1
Use instructions to follow
7
Using your repositories on panther Get the files from your repository before starting
Make a local respository as a clone of master git clone /opt/git/csc271books See all the contents of the folder
ls -a to see the .git folder.
Make changes See what changed
git diff Stage changes
git add –all (or particular files) git diff –cached Still only in your repository
8
Using your repository Put changes back up into repository
Commit your staged changes in your repository git commit -m "the reason for the change"
Update the respository: git push origin
See what is on the repository git remote
Get what is on repository git pull If it says to resolve manually, just vi that file and see the head
which is yours
9
Typical workflow
git pull remote_repository Get changes from a remote repository and merge them into
your own repository git status
See what Git thinks is going on Use this frequently!
Work on your files git add –-all (or just changes) git commit –m “What I did” git push
10
Helpful gitBash commands
Show staged differences: git diff -- cached Show status : git status Show branches: git branch See history: git log Checkout a branch: git checkout branch Fetch so you can look but maybe not take: git fetch Pull will fetch and merge with what you have: git merge
11
Git log commands
git log --pretty=oneline --max-count=2 git log --pretty=oneline --since='5 minutes ago' git log --pretty=oneline --until='5 minutes ago' git log --pretty=oneline --author=<your name> git log --pretty=oneline –all
12
Git log pretty
git log --pretty=format:"%h %ad | %s%d [%an]" --graph --date=short
--pretty="..." defines the output format. %h is the abbreviated hash of the commit %d commit decorations (e.g. branch heads or tags) %ad is the commit date %s is the comment %an is the name of the author --graph tells git to display the commit tree in the form of an
ASCII graph layout --date=short keeps the date format short and nice
13
Good aliases
alias gs='git status ' alias ga='git add ' alias gb='git branch ' alias gc='git commit' alias gd='git diff' alias go='git checkout ' alias gk='gitk --all&' alias gx='gitx --all' alias got='git ' alias get='git '
14