Iterates over the branches of a repository, executing a command (or custom script) on each checked out branch.

iterateRepoBranches.sh

#!/bin/bash -e

REPO_PATH=/home/jwliechty/dev/release/ascent-assays
COMMAND="$1"
ARG_COUNT="$#"

usage(){
    cat <<-END

Usage: $(basename $0) COMMAND

    where COMMAND will be the command executed with the branch name passed in
    as an argument. The command will be executed in the repository directory
    with the branch checked out. To pause on each branch, read from standard
    input within your custom script command.

Examples:

    $(basename $0) echo
    $(basename $0) my_custom_script.sh

END
  die
}

ensureCommandProvided(){
  [ -z "${command}" ] || usage
  [ "${ARG_COUNT}" = "1" ] || usage
}

goToRepo(){
  cd "${REPO_PATH}"
  isGitRepo || die "Not a git repository: ${REPO_PATH}"
}

updateRepo(){
  echo "Updating repository"
  git fetch origin
  git remote prune origin
}

runOnEachBranch(){
  echo -e "Iterating over branches...\n"
  for refname in $(git for-each-ref --format='%(refname:short)' refs/remotes/origin); do
    local branch="${refname#origin/}"
    [ "${branch}" != "HEAD" ] && executeOnBranch "${branch}"
  done
}

executeOnBranch(){
  local branch="$1"
  git checkout "${branch}" > /dev/null 2>&1 || die "Unable to checkout branch '${branch}'"
  git pull origin "${branch}" > /dev/null 2>&1 || die "Error while pulling branch '${branch}'"
  (
    ${COMMAND} "${branch}"
  ) || die "Command failed on branch '${branch}'"
}

isGitRepo(){
  git rev-parse 2> /dev/null
  return $?
}

die(){
  local msg="$1"
  echo "${msg}" >&2
  exit 1
}

ensureCommandProvided
goToRepo
updateRepo
runOnEachBranch