Add a single file to multiple local Git repositories and automatically open GitHub PRs

multi_commit.sh

#!/bin/bash

# Copy a set of files to each repo in a dir, create a branch, and push to origin
# Requires GitHub CLI: `brew install gh` and must be logged in with `gh auth login`: https://cli.github.com/manual/

# Usage: multi_commit.sh BRANCH_NAME PATH_TO_LANDING_DIR_IN_REPO_1 PATH_TO_LANDING_DIR_IN_REPO_2 ... PATH_TO_FILE_TO_ADD

# You can edit these variables
MAIN_BRANCH="master"

# Do not edit below this line
#############################

if [ "$#" -lt 4 ]; then  # if less than 4 parameters (script name counts as one)
    echo "Missing required parameters"
fi

NEW_BRANCH_NAME=$1 # First argument is the branch name
REPO_PATHS=${@:2:$(($#-2))}  # Second through second-to-last argument are the paths to where in the repos the file should be copied
FILE_PATH=${@:$#} # Last argument is the file to add
FILE_NAME=$(basename "$FILE_PATH") # Get the file name
COMMIT_MESSAGE="Added $FILE_NAME"

echo "Pushing changes for each repo..."

for REPO_PATH in $REPO_PATHS
do
    # go to the repo
    cd "$REPO_PATH" || exit 1

    echo "Working in $(pwd)..."

    # set up new branch
    # this is where things will fail if this is not a Git repository
    git stash  # stash any changes on our current branch
    git checkout "$MAIN_BRANCH"  # checkout our main branch
    git stash  # stash any changes on our main branch
    git pull  # update our main branch
    git checkout -b "$NEW_BRANCH_NAME" || git checkout "$NEW_BRANCH_NAME"  # make and/or checkout new branch
    
    # copy in file
    cp "$FILE_PATH" .
    echo "Copied $FILE_PATH to $(pwd)"
    
    # add file (as part of all changes)
    git add "$FILE_NAME"
    
    # show diff
    git diff
    
    # commit
    git commit -m "$COMMIT_MESSAGE"
    
    # push
    git push --set-upstream origin "$NEW_BRANCH_NAME"

    # open a pull request via GitHub CLI
    gh pr create --fill --base "$MAIN_BRANCH"
done

echo "Check GitHub for the open pull requests"