How to Bash Script Git Local Branch Check?

Question

Seeking a solution to achieve the following:

If a branch is not current created on local create
If it already exists prompt user and move to next statement

So far I've got it working but not quite there. My issue really is the latter, but I want to take a moment to rethink the whole thing and get some feedback on how to write this more soundly.

The variable existing_branch provides SHA and the refs/heads/branchName when a branch is there otherwise git takes hold and provides the expected fatal:

check_for_branch() {
 args=("$@")
 echo `$branch${args[0]}`
 existing_branch=$?
}

create_branch() {
  current="git rev-parse --abbrev-ref HEAD"
  branch="git show-ref --verify refs/heads/"

  args=("$@")
  branch_present=$(check_for_branch ${args[0]})
  echo $branch_present
  read -p "Do you really want to create branch $1 " ans
  case $ans in
    y | Y | yes | YES | Yes)
        if [  ! -z branch_present ]; then
          echo  "Branch already exists"
        else
          `git branch ${args[0]}`
          echo  "Created ${args[0]} branch"
        fi
    ;;
     n | N | no | NO | No)
      echo "exiting"
    ;;
    *)
    echo "Enter something I can work with y or n."
    ;;
    esac
}

Joe · Accepted Answer · 2013-01-19 11:59:28Z

7

You can avoid prompting if the branch already exists, and shorten the script a little, like this:

create_branch() {
  branch="${1:?Provide a branch name}"

  if git show-ref --verify --quiet "refs/heads/$branch"; then
    echo >&2 "Branch '$branch' already exists."
  else
    read -p "Do you really want to create branch $1 " ans
    ...
  fi
}

answered Jan 19, 2013 at 11:59

Joe

31.4k13 gold badges77 silver badges101 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

rhodee Over a year ago

Thank you this worked as I intended. New to bash scripting, care to explain how to use the curly braces and technique in line 2 and line 5 a bit more?

Joe Over a year ago

Check out parameter expansion, in POSIX or bash, and redirection. >&2 means that echo goes to stderr, rather than stdout.

Collectives™ on Stack Overflow

How to Bash Script Git Local Branch Check?

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related