github_check_branch.sh

#/bin/bash
#
# Assumes you have run 'github_get_all.sh' to get the latest git repos for your org
#
# Note:This script will ONLY work reliably if you have run 'github_get_all.sh on an empty
#      directory, so that all repos are freashly cloned and clean
#
# Iterate over all the github repos under the cwd, for each reports if
# branch1 is behind branch2
#
# eg: To see if develop is behind master:
#
#       github_check_branch.sh MyOrg master develop
#
# Outputs to ~github_check_branch.log logfile in the current dir.
#

# See https://github.com/davidoram/ght
ght repos -o "$1" > all_repos.txt

branch1=$2
branch2=$3

logfile=$(pwd)/~github_check_branch.log
echo "> Started. Checking if branch '${branch1}' is behind '${branch2}'" > ${logfile}

while read org_repo; do

  if [[ $org_repo =~ (.*)/(.*) ]]; then
    org=${BASH_REMATCH[1]}
    repo=${BASH_REMATCH[2]}

    if [[ -d "${repo}" ]]; then
      pushd "${repo}"

      diffurl="https://github.com/${org_repo}/compare/${branch1}...${branch2}"

      # Check branch1 exists
      git checkout "${branch1}"
      if [[ $? -eq 0 ]]; then

        # Check branch2 exists
        git checkout "${branch2}"
        if [[ $? -eq 0 ]]; then

          # See https://stackoverflow.com/questions/20433867/git-ahead-behind-info-between-master-and-branch
          behind=$( git rev-list --right-only --count ${branch1}...${branch2} )
          if [[ $behind -eq 0 ]]; then
            echo "OK ${org_repo} branch '${branch1}' is behind branch '${branch2}' by ${behind} commits. ${diffurl}" >> ${logfile}
          else
            echo "BEHIND ${org_repo} branch '${branch1}' is behind branch '${branch2}' by ${behind} commits. ${diffurl}" >> ${logfile}
          fi

        else
          echo "MISSING ${org_repo} doesnt have branch '${branch2}'. ${diffurl}" >> ${logfile}
        fi
      else
        echo "MISSING ${org_repo} doesnt have branch '${branch1}'. ${diffurl}" >> ${logfile}
      fi

      popd
    else
      echo "${org_repo} ERROR: Missing repo " >> ${logfile}
    fi

  fi
done <all_repos.txt

echo '> Finished' >> ${logfile}

echo "See ${logfile}"