Shell script to copy files to git branches

copytobranches.sh

#!/bin/bash

# Checks out each of your branches 
# copies the current version of 
# certain files to each branch

echo "\n\n\n\n===================================\n"

# Show this help screen if bad options are passed
showHelp() {
   echo "Usage: $0 -k args_key -f parameter_files -b parameter_branches  -b parameter_exclude -p parameter_push"
   echo "\t-k The name of the key branch, otherwise main/master if available"
   echo "\t-f List of files you want to copy to the branches"
   echo "\t-b List of branches you want to copy the files to"
   echo "\t-e List of branches you want to exclude"
   echo "\t-p Optionally push the branch back to the repository"
   exit 1 # Exit script after printing help
}


# Get the options from arguments passed to project
while getopts "pk:f:b:e:" opt
do
   case "$opt" in
      p ) args_action=PUSH ;;
      k ) args_key="$OPTARG" ;;
      f ) set -f
          args_files=($OPTARG)
          set +f ;;
      b ) set -b
          args_branches=($OPTARG)
          set +f ;;
      e ) set -b
          args_exclude=($OPTARG)
          set +f ;;
      ? ) showHelp ;;
   esac
done

# Set default list of branches to use
if [ ! -z "${args_branches}" ];
then
	ALL_THE_BRANCHES=( "${args_branches[@]}" )
else
  ALL_THE_BRANCHES=`git branch --list|sed 's/\*//g'`
fi

# Set the KEY branch
if [ ! -z "${args_key}" ];
then
	KEY_BRANCH=$args_key
elif [[ $ALL_THE_BRANCHES[*]} =~ 'master' ]];
then
  KEY_BRANCH='master'
elif [[ $ALL_THE_BRANCHES[*]} =~ 'main' ]];
then
  KEY_BRANCH='main'
else
	echo "Error: A key branch does not exist"
 	exit 1
fi

# Set default list of files to copy
if [ ! -z "${args_files}" ];
then
  echo "\n\n\n\n===================================\n"
  echo "FILES TO PROCESS: ${args_files[*]}"
	ALL_THE_FILES=( "${args_files[@]}" )
else
  ALL_THE_FILES=('LICENSE' 'NOTICE' 'README.md')
fi

# Loop through the array of branches and perform
# a series of checkouts from the KEY_BRANCH 
for CURRENT_BRANCH in ${ALL_THE_BRANCHES[@]};
  do

    # exclude certain branches from processing if the user
    # has added a -e flag with a list of branches in quotations

    CONTINUE_BRANCH=false

    for EXCLUDE_BRANCH in "${args_exclude[@]}"
      do
        if [ "$CURRENT_BRANCH" = "$EXCLUDE_BRANCH" ]
        then
          CONTINUE_BRANCH=true
        fi
      done

      if [ "$CONTINUE_BRANCH" = true ]
      then 
        continue
      fi

    # Check out the current branch, but only if
    # the branch is NOT the same as the key branch
    if [ "${KEY_BRANCH}" != "${CURRENT_BRANCH}" ];
    then
      echo "-------------------------------"
      git checkout $CURRENT_BRANCH

      # Go through each of the files
      # Check out the selected files from the source branch
      for CURRENT_FILE in ${ALL_THE_FILES[@]};
        do
            echo "\n--COPY: $CURRENT_FILE"
            git checkout $KEY_BRANCH $CURRENT_FILE
        done

      # Commit the changes
      git add -A && git commit -m "Moving: ${ALL_THE_FILES[@]} from $KEY_BRANCH branch"

      # push the branch to the repository origin
      if [ "$args_action" = "PUSH" ];
      then
        git push --set-upstream origin $CURRENT_BRANCH
      fi

    fi
  done

# Check out the key branch
git checkout $KEY_BRANCH

echo "\n===================================\n\n\n\n"