Uly.me

cloud engineer

git

XCode after Catalina Upgrade

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I tried running git after the Mac OS Catalina upgrade and got this error.

xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools),
missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun

Here’s the fix. For some very odd reason, Apple does not automatically reinstall xcode after each Mac OS upgrade.

You will need to either reset it or install it again.

# Try reset first
xcode-select --reset
# Or install it if reset doesn't work
xcode-select --install

Close your terminal, and reopen and run git again.

Git Diff Head

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Here’s how to check what’s changed in your local Git repo vs the master repo.

Git Status tells you what file has changed, but not to the level of detail such as what lines or what code was changed.

git diff HEAD

Storing Git Credentials

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There are two ways to store git credentials. One is temporary and the other permanent. You can store your git credentials unencrypted on disk forever or in cache memory temporarily.

Temporary. Store for 15 minutes.

git config credential.helper 'cache --timeout=900'

Permanent.

git config credential.helper store
git push http://example.com/repo.git
Username: <type your username>
Password: <type your password>

Next time you use git, you will not be prompted for a password.

Cloning A GCP Repo

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Here are the steps on how to clone a Google Cloud Platform (GCP) repository. This is assuming you already installed Google Cloud SDK.

gcloud init
gcloud source repos clone name_of_repo --project=project_name
cd name_of_repo
git commit -a -m "your comment"
git push -u origin master

Git Diff

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When working with version control, sometimes you would like to know what files were committed locally vs what’s on the master origin repository. One way to know the difference is to use the git diff or the git log commands. Here are the commands to check the differences between the local and master origin repositories. Diff is better in my opinion since it actually displays the code changes instead of just displaying the commit ID.

$ git diff origin/master..HEAD
$ git log origin/master..HEAD

GitLab Moves to GCP

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Gitlab is moving from Microsoft Azure to Google Cloud Platform mainly due to its integration with Google Kubernetes Engine. Gitlab believes Kubernetes is the future and makes their platform to massively scale as it grows. The move is scheduled on July 28. Gitlab plans to use their Geo product for the migration of Gitlab.com. For more, read the article.

Github Acquired by Microsoft

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Microsoft acquired Github today for $7.5 billion. Github was founded in 2008. It stores and manages code in repositories using Git, a distributed version control software developed by Linus Torvalds. It has 28 million users and 85 million projects. Github public repositories are free. Private repositories start at $7 per month for developers. For teams, it starts at $9 per user/month and up to $21 per user/month. If you like to run your own Git repository, check out GitLab. Just install it on a Linux server.

Gitlab Community Edition

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Git is the most popular version control software for managing your code. If you’re looking for the best version control system out there, Git is the pretty much the de-facto standard of version control. Although you can run Git locally without a server, you’ll need some kind of repository to share your code with others.

Enter Github. Github provide free and paid Git repositories. Github public repositories are free, while private ones require subscription. For $7 dollars a month, you can have up to 5 private repositories. For $50 per month, you can use up to 50 repositories.

If you want to run your own Git repository either on the cloud or on your own private network (it’s more secure this way), then you’ll need to look at Gitlab’s Community Edition (Github.com is proprietary). Gitlab requires that you install their software on a Linux server (I’m using Ubuntu Server).

I tried running Gitlab CE on the cheapest server ($5 per month) I can find at Digital Ocean. It works but, it’s painfully slow. I don’t recommend it. The $5 per month server only has 1 CPU core and 512 MB of RAM. I recommend that you go for a system that has 2 CPU cores and 2GB of RAM. This system will cost $20 per month.

By the way, if you don’t want managing your own server, you can simply sign up with Gitlab.com. It’s free! They offer unlimited private and public repositories up to 10GB of disk space per project. Of course, Gitlab has other products. For a paid subscription you can get enterprise support and more advanced features.

Visit Gitlab for more details.

Remove Sensitive Info From Github

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I made a mistake by publishing my database password to an environment file that’s visible. Rookie mistake. Replacing the database password entry with something else and submitting kinda takes care of the problem, but anyone can still view the history of the file and see your password. One way of getting rid of this, if you don’t really care about the history of your submits, is to reinitialize the project back to the initial commit. Here’s how.

// Clone the project to your local computer
$ git clone https://github.com/name/myproject.git
 
// go to your project directory
$ cd myproject
 
// delete the .git folder where all the history is kept
$ rm -rf .git
 
// reinitialize your repository
$ git init
 
// add Github url
$ git remote add origin https://github.com/name/myproject.git
 
// verify remote
$ git remote -v
 
// Add all files and commit the changes
$ git add --all
$ git commit -am 'initial commit'
 
// Finally, push to the origin server which is Github
$ git push -f origin master

Your sensitive data is now gone from history. Just be careful next time.