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Git Hook.md

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Problem Statement

The Nautilus application development team was working on a git repository /opt/ecommerce.git which is cloned under /usr/src/kodekloudrepos directory present on Storage server in Stratos DC. The team want to setup a hook on this repository, please find below more details:

Merge the feature branch into the master branch`, but before pushing your changes complete below point.

Create a post-update hook in this git repository so that whenever any changes are pushed to the master branch, it creates a release tag with name release-2023-06-15, where 2023-06-15 is supposed to be the current date. For example if today is 20th June, 2023 then the release tag must be release-2023-06-20. Make sure you test the hook at least once and create a release tag for today's release.

Finally remember to push your changes.

Solution

1. SSH into the Server

First, connect to the server where the Git repository is hosted:

ssh natasha@ststor01
sudo su

2. Navigate to the Repository Directory

Change to the Git repository’s hooks directory:

cd /opt/ecommerce.git/hooks

3. Create the post-update Hook Script

Create the post-update hook file using your preferred text editor. Here we use vi, but you can use nano or any other text editor:

vi post-update

4. Edit the post-update Hook Script

Add the following script to the post-update hook file. This script will:

  • Check if the master branch was updated.
  • Create a tag with the current date.
  • Push the tag to the remote repository.
#!/bin/bash

# Get the current date in YYYY-MM-DD format
current_date=$(date +%Y-%m-%d)

# Define the tag name
tag_name="release-$current_date"

# Iterate over each ref updated
for ref in "$@"; do
    if [[ "$ref" == *"refs/heads/master"* ]]; then
        echo "Creating tag $tag_name on master branch"
        # Create a new tag for the latest commit on master
        git tag "$tag_name" "$(git rev-parse HEAD)"
        # Push the new tag to the remote repository
        git push origin "$tag_name"
    fi
done

This script:

  • Retrieves the current date.
  • Defines a tag name based on the current date.
  • Checks if the update was made to the master branch.
  • Tags the latest commit on the master branch.
  • Pushes the tag to the remote repository.

5. Make the Script Executable

Ensure the post-update script has executable permissions:

sudo chmod +x post-update

6. Merge the Feature Branch into Master

Navigate to the cloned repository directory and merge the feature branch into the master branch:

cd /usr/src/kodekloudrepos/ecommerce
git checkout master
git pull origin master
git merge feature

Expected Output:

Updating 00092bb..5388672
Fast-forward
feature.txt | 1 +
1 file changed, 1 insertion(+)
create mode 100644 feature.txt

7. Push the Changes to Master

Push the changes to the remote master branch:

git push origin master

Expected Output:

To /opt/ecommerce.git
00092bb..5388672  master -> master

8. Verify the Tag Creation

After pushing, check if the new tag has been created and pushed by listing the tags:

git tag

You should see a tag in the format release-YYYY-MM-DD corresponding to today’s date.

9. Push Local Changes (if applicable)

If you made any local changes (e.g., modifying the post-update hook script), commit and push them:

git add .
git commit -m "Set up post-update hook for release tagging"
git push origin master