Git - Check stale branches and alert on Slack - #git #stale #branches #slack #sanity

git-sanity-check.sh

#!/usr/bin/env bash

: ' Script that checks stale branches based on a specific date on a git
    repository and send an alert message on a Slack channel

    '

# check if debug flag is set
if [ "${DEBUG}" = true ]; then

  set -x # enable print commands and their arguments as they are executed.
  export # show all declared variables (includes system variables)
  whoami # print current user

else

  # unset if flag is not set
  unset DEBUG

fi

# bash default parameters
set -o errexit  # make your script exit when a command fails
set -o pipefail # exit status of the last command that threw a non-zero exit code is returned
set -o nounset  # exit when your script tries to use undeclared variables

# check binaries
__BASENAME=$(which basename)
__CURL=$(which curl)
__DATE=$(which date)
__GIT=$(which git)
__HEAD=$(which head)
__SED=$(which sed)

# parameters
__date=${1:-"4 weeks ago"}
__branch_exclusion_list=${2:-"dev|stage|master"}
__slack_channel_or_person="${3:-"#my-ci-channel"}"
__msg_from="${4:-"bitbucket-sanity-check-bot"}"
__msg_alert_icon="${5:-":x:"}"
__slack_webhook_url="${6:-"https://hooks.slack.com/services/ASD4456S5/AHCE54563/ai85930591zBNasd456qwett"}"

# variables
readonly __date_epoch=$(${__DATE} --date="${__date}" +%s)
readonly __git_repo_name=$(${__BASENAME} $(${__GIT} rev-parse --show-toplevel))

# functions
function push_to_slack {

  # parameters
  local __from="${1:-}"
  local __channel_or_person="${2:-}"
  local __text="${3:-}"

  # push to slack via webhook
  ${__CURL} --request POST \
            --data-urlencode \
              "payload={\"username\": \"${__from}\",
                        \"channel\": \"${__channel_or_person}\",
                        \"text\": \"${__text}\",
                        \"as_user\": \"false\",
                        \"link_names\": \"true\"
                       }" \
            "${__slack_webhook_url}"

} # end of push_to_slack

# flow
for __branch in $(${__GIT} branch --remote); do

  # check if it is not one of the environment branches/tags
  if [[ ! ${__branch} =~ ^.*(${__branch_exclusion_list}|->|origin\/HEAD)$ ]]; then

    # get the last commit date in UNIX epoch format
    __last_commit_date_epoch=$(${__GIT} show ${__branch} --name-only --pretty="format:%at" | ${__HEAD} -1)

    # check if the last commit is older than the reference date
    if [[ ${__last_commit_date_epoch} < ${__date_epoch} ]]; then

      __branch_name=$(echo ${__branch} | ${__SED} 's/^origin\///')
      __last_commit_author=$(${__GIT} show ${__branch} --name-only --pretty="format: %ci by %an" | ${__HEAD} -n 1)
      push_to_slack "${__msg_from}" \
                    "${__slack_channel_or_person}" \
                    "${__msg_alert_icon}   Repository *${__git_repo_name}*  ${__msg_alert_icon}\nBranch *${__branch_name}* is older than *${__date}*\n Last commit *${__last_commit_author}* \n@channel please check."

    fi

  fi

done