Getting


Based on slides by Mojtaba Shahi Senobari --- Amirehsan Davoodi and Scott Chacon



Git is an open source,

distributed,

version control system

designed for speed and efficiency



Git is an open source,

distributed,

version control system

designed for speed and efficiency

Open Source



Git was created for managing code
contributions to the Linux kernel


Git will always be open,
available for anyone to contribute



Git is an open source,

distributed,

version control system

designed for speed and efficiency

CENTRALIZED VCS


Examples: subversion, perforce, bitkeeper

Distributed VCS


Examples: git, mercurial, bazaar

Since git is distributed...


Every copy is a master

Every copy is a backup

Every copy contains the whole revision history

Everything is fast

Work offline

No Network Needed


Performing a diff

Viewing file history

Committing changes

Merging branches

Obtaining revision history

Creating/Switching branches



Git is an open source,

distributed,

version control system

designed for speed and efficiency

What is Version Control?



the task of keeping a software system consisting of many versions and configurations well organized.

or

Version control is a system that records changes to a file or set of files over time so that you can recall specific versions later. (from git-scm.com)

Why Version Control?



VCSs were built to manage code
as it developed over time...


Turns out to be perfect for
managing translations over time!

For Example


First commit
# 1. The Creation

![01-01](https://api.unfoldingword.org/obs/jpg/1/en/360px/obs-en-01-01.jpg)

This is how the beginning of everything happened. God created the universe and everything in it in six days. After God created the earth it was dark and empty, and nothing had been formed in it. But God's Spirit was there over the water.

Second commit
# 1. The Creation

![01-01](https://api.unfoldingword.org/obs/jpg/1/en/360px/obs-en-01-01.jpg)

This is how the beginning of everything happened. God created the universe and everything in it in six days. After God created the earth it was dark and empty, and nothing had been formed in it. But God's Spirit was over the water.

Added this.

What's different?

Easy, Look at the Diff!



Check it out yourself at
http://ufw.io/simple_diff

Git Doesn't Delete



In normal usage, git does not delete any data

You can always go back to a previous commit (translation in this case)

Data can only be permanently removed through specialized commands

Git Models Workflows


Git was built generically, to accommodate many different workflows

Turns out that developers and translators want to do the same things:

  • Restore old work
  • Start working where someone left off
  • Work on individual sections and then merge
  • Review each other's work
  • Tag various points in history (e.g. releases)
  • Track work being done (Gogs add-on, Issues)



Git is an open source,

distributed,

version control system

designed for speed and efficiency

Compared to SVN



Git is 3x-7x faster to commit than SVN


Git is 318x faster to perform a diff than SVN


Git is 34x faster to show the log than SVN

Committing and Pushing



Performing a git commit is  instant for small commits, no network needed


Performing a git push only sends the compressed changes to the server

Command Line Basics


IDENTITY

$ git config --global user.name "John Doe"
$ git config --global user.email johndoe@example.com

CREATING A REPOSITORY

$ mkdir Testing
$ cd Testing
$ git init

CLONING A REPOSITORY

$ git clone https://git.door43.org/jag3773/Testing.git  # HTTPS$ git clone git@git.door43.org:jag3773/Testing.git  # SSH

Common Commands (1)


ADD NEW FILE
$ git add README.rst 

REMOVE FILE
$ git rm file.py 
 
COMMIT CHANGES
$ git commit -am 'First commit'

COMMON COMMANDS (2)

SHOW LOG
$ git log

SHOW COMMITS
$ git show

SHOW DIFFS
$ git diff


UNDOING THINGS


UNMODIFY MODIFIED FILE

$ git checkout -- file.py


REVERT A COMMIT

$ git revert 1776f5


Dangerous: Wipe All Local Changes out

$ git reset --hard HEAD


Remote Commands

Push  To remote
$ git push origin branch_name
Fetch & Merge
$ git pull
# or
$ git pull --no-edit origin master
Fetch
$ git fetch origin
Merge
$ git merge origin master

BRANCHES

http://pcottle.github.io/learnGitBranching/


BRANCH MANAGEMENT


Create new Branch
$ git branch iss53
Switch Branch
$ git checkout iss53
Delete Branch
$ git branch -d iss53
Show Branches
$ git branch
     iss53
   * master

Conflict Resolution

(No Counselor Needed)


Usually, git does the right thing and merges happen automatically


Sometimes, there are conflicts that git can't handle by itself, in such a case the user is asked to choose the right one.

Note, git cannot decided which piece of text or code is better from a qualitative standpoint, it can only decided whether there is a conflict when merging

Example Auto-Merge



In this case, the latest commit is the only one that has changed the referenced lines, so it is accepted.

Example Conflict

jesse@jesse /tmp/Testing $ git branch
  conflict
* master
jesse@jesse /tmp/Testing $ git checkout conflict
Switched to branch 'conflict'
Your branch is up-to-date with 'origin/conflict'.
jesse@jesse /tmp/Testing $ git merge master
Auto-merging 01.txt
CONFLICT (content): Merge conflict in 01.txt
Automatic merge failed; fix conflicts and then commit the result.
jesse@jesse /tmp/Testing $ git status -s
UU 01.txt
jesse@jesse /tmp/Testing $ git diff
diff --cc 01.txt
index 44d36fa,e620274..0000000
--- a/01.txt
+++ b/01.txt
@@@ -4,4 -4,4 +4,8 @@@
  
  This is how the beginning of everything happened. God created the universe and everything in it in six days. After God created the earth it was dark and empty, and nothing had been formed in it. But God's Spirit was there over the water.
  
++<<<<<<< HEAD
 +This will cause problems.
++=======
+ Supposedly harmless addition...
++>>>>>>> master

Example Fix


Choose the best text, either from the 'conflict' branch or from the 'master' branch and update the file

Commit

Push

It makes more sense when you do it!

tS Uploads


translationStudio uploads to git.door43.org

You can see all the uploads on the https://git.door43.org/explore page

In an upcoming release, tS users will be able to associate their tS device with their Door43 account

This will make it easier to see what's "mine" and what's "yours"

How to Merge tS Uploads?


Find the relevant repos on https://git.door43.org/explore

Fork the "best" one to your account, or create a new repo in your account

Clone them to your computer

Merge the changes

Push to your own repo

Find the Repos



On the Explore page, search for the repos


Repos are named after the language and book of the Bible that was translated, for example: uw-1th-or

Fork the Most Complete One



Identify the repo that has most of the data that you want.  If you can't, just pick one, or create a new one.


After forking, consider your fork to be the "master" for this project.

From now on, all of the changes will be merged into your repo.

Clone the Repos


Clone all of the repos for your project


Make a list of them in a file, mylist.


Then clone them all
$ for x in `cat mylist`; do git clone $x; done

Track A: Copy and Paste


If you don't care to have the tS version history in your master repo, you can copy and paste.

You can use a file manager and copy the respective folders from the tS uploads into your master repo.


Once you have your master correct,
add, commit and push your changes

$ git add .
$ git commit -a
$ git push

Track B: Merge Step 1


If you want to preserve all the history from each tS device in the master repository, then you'll want to merge.


Push from each of the cloned repos in your master repo.

for x in `ls repos`; do
  cd repos/$x  git checkout -b $x
  git push ~/master_repo $x
done

Track B: Merge Step 2


You now have several branches in your local copy of your master repo.


Now you need to merge each of these into the master branch.

$ git merge -s ours $branch_name

Using -s ours will keep changes in your current branch
if there is a conflict

Last, push
$ git push

Reviewing on Door43



The "new" Door43 is a Git server git.door43.org

The goal is for this to be a back-end for technical users only (you!)

Do not send translators to git.door43.org, they will be confused unless they are also technical

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