Git Hooks

• We always want to speed up our workflows, right? Of course, automation is the best way to do that.
  
  

• ​Git hooks are scripts that Git executes before or after events such as: commit, push, and receive.
  
  

• In my words, Hooks is like an event trigger, After you did some git operation it'll trigger some events.
  
  

• There are two types of git Hooks.
  ​
         1.) Client side (Local PC)
  ​       2.) Server side (Remote Server)
  

What is Hooks

• Git hooks is in .git folder in the project repository
   
• You can use any scripting language
   
• Have to make the hooks executable 
  
  ( Chmod +x file_name )

Where I can Find it ??

• Built in scripts are mostly shell and perl
   
• You can use shell script, Ruby, Python. You need to specify which interpreter are we using
             
  
  
   

Scripting Language

#!/bin/sh   => For shell Scripts

#!/usr/bin/env python    => For Python

#!/usr/bin/env ruby     => For Ruby

• They are local to any Git repository and they are not copied to new repository.
   
• To make the hooks stay update among developers or team it have to be under version control.
   
• Store hooks in the project directory
   
• Once it's updated copy those to the local .git/hooks folder

Scope of Hook..

• applypatch-msg

• pre-applypatch

• post-applypatch

• pre-commit

• prepare-commit-msg

• commit-msg

• post-commit

• pre-rebase

• pre-receive
• update

• post-receive

Types Of Hooks (.git/hooks)

pre-commit

Pre-commit - Check (Commit Life Cycle)

prepare-commit-msg

commit-msg

post-commit

Pre-commit - 1 

diff_files = %x(git diff --cached --name-only)

rails_result = `grep -rlns "binding.pry" --exclude-dir=".git" #{diff_files}`

if rails_result != ""
	puts 'You have added binding.pry in your files'.colorize(:red)
	puts rails_result
	exit 1
end

Pre-commit - 2 

failures = %x(rspec spec/ |grep "examples"| grep "failure"| awk {'print $3'}).to_i


if failures!=0
	puts 'Your modified files doesnot passed the test'.colorize(:red)
	exit 1
else
	puts 'All test passed'.colorize(:green)
	exit 0
end

Tired of Scripting ?? Try pre commit

https://github.com/jish/pre-commit

Thanks