gistfile1.txt

#!/bin/bash
# Usage: myscript --base branchA --head branchB
# This script iterates through directories starting with "MYREPO" in the current folder,
# checks if they are Git repositories, updates the specified branches, and saves the commit
# diff (with a custom format) into a release info file for each repo.

# Define your repository prefix
PREFIX="MYREPO"

# Parse command-line arguments
while [[ "$#" -gt 0 ]]; do
    case $1 in
        --base)
            BASE="$2"
            shift
            ;;
        --head)
            HEAD="$2"
            shift
            ;;
        *)
            echo "Unknown parameter passed: $1"
            exit 1
            ;;
    esac
    shift
done

if [[ -z "$BASE" || -z "$HEAD" ]]; then
    echo "Usage: $0 --base branchA --head branchB"
    exit 1
fi

# Save the top-level directory (where the script was invoked)
TOP_DIR=$(pwd)

# Iterate over each directory starting with the defined prefix
for dir in ${PREFIX}*/; do
    if [ -d "$dir" ]; then
        repo_name=$(basename "$dir")
        # Check if the directory contains a .git folder
        if [ -d "${dir}/.git" ]; then
            echo "Processing repository: $repo_name"
            cd "$dir" || continue

            # Save current branch so we can return to it later
            current=$(git rev-parse --abbrev-ref HEAD)

            # Update the base branch
            echo "Checking out and pulling latest changes for $BASE in $repo_name..."
            git checkout "$BASE" || { echo "Failed to checkout $BASE in $repo_name"; cd "$TOP_DIR"; continue; }
            git pull || { echo "Failed to pull on $BASE in $repo_name"; cd "$TOP_DIR"; continue; }

            # Update the head branch
            echo "Checking out and pulling latest changes for $HEAD in $repo_name..."
            git checkout "$HEAD" || { echo "Failed to checkout $HEAD in $repo_name"; cd "$TOP_DIR"; continue; }
            git pull || { echo "Failed to pull on $HEAD in $repo_name"; cd "$TOP_DIR"; continue; }

            # Save the commit list directly to the output file with the desired formatting.
            # The format is "|||commit-hash|||commit-message|||;" with a newline after each commit.
            output_file="${TOP_DIR}/${repo_name}_release-info.txt"
            git log "$BASE..$HEAD" --pretty=format:"|||%H|||%s|||;\n" > "$output_file"

            echo "Saved release info for $repo_name to $output_file"

            # Return to the original branch and then to the top-level directory
            git checkout "$current" || { echo "Failed to return to $current in $repo_name"; }
            cd "$TOP_DIR" || exit
        else
            echo "Skipping $repo_name: no .git folder found."
        fi
    fi
done