git tricks



Git is a distributed version control and source code management (SCM) system with an emphasis on speed. I use git for all my project including this website. I use it in command line with tig.

Merge two different repository

If you have two different repository (first and second) to merge in one even in local:

We create a new git repository ans make an initial commit:

mkdir newRepository
git init
touch .gitignore
git add .gitignore
git commit .gitignore -m 'init'

We fetch and merge the first:

git remote add first pathTo/first
git fetch first
git merge first/master

If you have a message like fatal: refusing to merge unrelated histories you need to force git to merge the projects using --allow-unrelated-histories.

We fetch and merge the second:

git remote add second pathTo/second
git fetch second
git merge second/master

Remove unwanted data (passwords) from git history

It append to put unwanted data in a file, and then commit this data to git, in this case you may want to remove all this data from your history. To do so, just rewrite the history with the following command:

git filter-branch --tree-filter 'git ls-files -z "*.py" |xargs -0 perl -p -i -e "s#(PASSWORD1|PASSWORD2)#youPassowrd#g"' -- --all

This command will just change the history of python files and replace "PASSWORD1" and "PASSWORD2" whit "youPassword".

WARNING rewriting history is dangerous, make a backup before doing anything.