#!/usr/bin/env bash
#
# Release script for Akka.
#
# ATTENTION: This script involves calling `git clean -fxd` which will remove all untracked
#            files from your working directory (including IDE settings).
#
# Prerequisites and Installation Instructions
#
# 1) You must be able to sign the artifacts with PGP
#
# 1.1) If you don't have PGP and a PGP key
#      On OS X from othe command line:
#        shell> brew install gnupg
#        shell> gpg --gen-key
#
#      Default values for the key type and 2048 bits is OK.
#      Make sure to use the email address that you will use later to register
#      with Sonatype.
#
# 1.2) Check that signing works
#      From inside sbt do the following
#        sbt> publish-local-signed
#      It should should ask you for your pass phrase, and create .asc files for
#      all artifacts
#
# 1.3) Publish your key to a server that Sonatype use
#      From the command line:
#        shell> gpg --keyserver hkp://pool.sks-keyservers.net/ --send-keys <your key id>
#      To find out your key id do this from the command line:
#        shell> gpg --list-keys
#        pub    2048/<your key id> ...
#      You can verify the existence of your key here, if you don't trust your tool:
#        https://sks-keyservers.net/i/#extract
#
# 2) You must have publishing rights to oss.sonatype.org
#
# 2.1) Register with oss.sonatype.org by only following the instructions under
#      sign up here https://docs.sonatype.org/display/Repository/Sonatype+OSS+Maven+Repository+Usage+Guide
#      Use the same email address as you used for the pgp key.
#
# 2.2) Ask Jonas who is the original creator of this ticket https://issues.sonatype.org/browse/OSSRH-3097
#      to add a comment that says that your username (not your full name) should
#      have publish access to that project. There is manual administration of
#      the ticket at Sonatype, so it could take a little while.
#
# 2.3) Add your credentials to sbt by adding a global.sbt file in your sbt home
#      directory containing the following.
#        credentials += Credentials("Sonatype Nexus Repository Manager",
#                          "oss.sonatype.org",
#                          "<your username>",
#                          "<your password>")
#
# 3) You must have access to repo.akka.io
#
# 3.1) Ask someone in the team for login information for the akkarepo user.
#
# 3.2) Install your public ssh key to avoid typing in your password.
#      From the command line:
#        shell> cat ~/.ssh/id_rsa.pub | ssh akkarepo@repo.akka.io "cat >> ~/.ssh/authorized_keys"
#
# 4) You must have upload access to S3 bucket "downloads.typesafe.com"
#
# 4.1) Ask Akka team member for the AWS access key for 'akka.team' user.
#
# 4.2) Add your credentials to sbt by adding this to your global.sbt file
#        credentials += Credentials("Amazon S3",
#          "downloads.typesafe.com.s3.amazonaws.com",
#          "<Access Key Id>",
#          "<Secret Access Key>")
#
# 5) Have access to github.com/akka/akka. This should be a given.
#
# Now you should be all set to run the script
#
# Run the script in two stages.
#  First a dry run:
#    shell> project/scripts/release <version>
#  And if all goes well a real run:
#    shell> project/scripts/release --real-run <version>
#
# The artifacts published to oss.sonatype.org needs to be released by following the
# instructions under release here
# https://docs.sonatype.org/display/Repository/Sonatype+OSS+Maven+Repository+Usage+Guide

# defaults
declare -r default_server="akkarepo@repo.akka.io"
declare -r default_path="www"

# settings
declare -r release_dir="target/release"
declare release_server=${default_server}
declare release_path=${default_path}

# flags
unset run_tests dry_run no_mima no_revert

# dry-run is the default
dry_run=true

# get the source location for this script; handles symlinks
function get_script_path {
  local source="${BASH_SOURCE[0]}"
  while [ -h "${source}" ] ; do
    source="$(readlink "${source}")";
  done
  echo ${source}
}

# path, name, and dir for this script
declare -r script_path=$(get_script_path)
declare -r script_name=$(basename "${script_path}")
declare -r script_dir="$(cd -P "$(dirname "${script_path}")" && pwd)"

# print usage info
function usage {
  cat <<EOM
Dry run is be default.
Usage: ${script_name} [options] VERSION
  -h | --help            Print this usage message
  -t | --run-tests       Run all tests before releasing
  -s | --server SERVER   Set the release server (default ${default_server})
  -p | --path PATH       Set the path on the release server (default ${default_path})
  -e | --real-run        Build everything and push the release
  -m | --no-mima         Skip binary compatibility check in dry-run
  -r | --no-revert       On dry-run don't revert git commits and tags
EOM
}

# echo a log message
function echolog {
  echo "[${script_name}] $@"
}

# echo an error message
function echoerr {
  echo "[${script_name}] $@" 1>&2
}

# echo a dry run log message
function echodry {
  echolog "(dry run) $@"
}

# fail the script with an error message
function fail {
  echoerr "$@"
  exit 1
}

# process options and set flags
while true; do
  case "$1" in
    -h | --help ) usage; exit 1 ;;
    -t | --run-tests ) run_tests=true; shift ;;
    -s | --server ) release_server=$2; shift 2 ;;
    -p | --path ) release_path=$2; shift 2 ;;
    -e | --real-run) unset dry_run; shift ;;
    -m | --no-mima) no_mima=true; shift ;;
    -r | --no-revert) no_revert=true; shift ;;
    * ) break ;;
  esac
done

if [ $# != "1" ]; then
  usage
  fail "A release version must be specified"
fi

declare -r version=$1
declare -r publish_path="${release_server}:${release_path}"

[[ `java -version 2>&1 | grep -E "java version|openjdk version" | cut -d ' ' -f3 | cut -d '.' -f2` -eq 8 ]] || fail "Java version is not 1.8"

# check for a git command
type -P git &> /dev/null || fail "git command not found"

# check for an sbt command
type -P sbt &> /dev/null || fail "sbt command not found"

# check for an rsync command
type -P rsync &> /dev/null || fail "rsync command not found"

# check for a tar command
type -P tar &> /dev/null || fail "tar command not found"

# get the current git branch
function get_current_branch {
  local ref=$(git symbolic-ref HEAD 2> /dev/null)
  local branch=${ref#refs/heads/}
  echo "${branch}"
}

# get the current project version from sbt
# a little messy as the ansi escape codes are included
function get_current_version {
  local result=$(sbt version | grep -v warn | tail -1 | cut -f2)
  # remove ansi escape code from end
  local code0=$(echo -e "\033[0m")
  echo ${result%$code0}
}

# store the current git branch for cleaning up
declare -r initial_branch=$(get_current_branch)

# check we have an initial branch
[[ "${initial_branch}" ]] || fail "Not on a git branch"

# check that we have a clean status
[[ -z "$(git status --porcelain)" ]] || {
  git status
  fail "There are uncommitted changes - please commit before releasing"
}

(read -p "The working directory will now be cleaned from all non-tracked files. Are you sure you want this? " x; test "$x" = yes) || fail "bailing out"
git clean -fxd || fail "cannot git clean -fxd"

# the branch we'll release on
declare -r release_branch="releasing-${version}"

# try to run a cleanup command - these shouldn't actually fail
function safely {
  "$@" || fail "Failed to clean up release - please check current state"
}

# perform a clean up when a failure has occurred
function git_cleanup {
  echoerr "Cleaning up..."
  local branch=$(get_current_branch)
  safely git reset --hard
  safely git clean -f
  if [ "${branch}" == "${release_branch}" ]; then
    safely git checkout ${initial_branch}
    safely git branch -D ${release_branch}
    local tags=$(git tag -l)
    [[ "${tags}" == *v${version}* ]] && safely git tag -d v${version}
  fi
}

# clean up and fail the script with an error message
function bail_out {
  echoerr "Bailing out!"
  git_cleanup
  echoerr "Cleaned up failed release"
  fail "$@"
}

# bail out for signals
function signal_bail_out {
  echoerr "Interrupted by signal"
  bail_out "Received signal to stop release"
}

# bail out on signals
trap signal_bail_out SIGHUP SIGINT SIGTERM

# try to run a command or otherwise bail out
function try {
  "$@" || bail_out "Failed to create release"
}

echolog "Creating release ${version} ..."

if [ $dry_run ]; then
  echodry "Building everything but not pushing release"
else
  echolog "Publishing to ${publish_path}"
fi

[[ $run_tests ]] && echolog "All tests will be run"

# try ssh'ing to the release server
echolog "Checking ssh connection to ${release_server}"
try ssh -t ${release_server} echo "Successfully contacted release server."

echolog "Getting current project version from sbt..."
declare -r current_version=$(get_current_version)
echolog "Current version is ${current_version}"

# check out a release branch
try git checkout -b ${release_branch}

# find and replace the version
try ${script_dir}/find-replace ${current_version} ${version}

# start clean
try sbt clean

# run the tests if specified
if [ $run_tests ]; then
  echolog "Running all tests..."
  try sbt test
  echolog "All tests are green"
fi

# build the release
echolog "Building the release..."
if [ ! $dry_run ]; then
  RELEASE_OPT="-Dakka.genjavadoc.enabled=true -Dpublish.maven.central=true"
else
  RELEASE_OPT="-Dakka.genjavadoc.enabled=true"
fi
try sbt $RELEASE_OPT +build-release
echolog "Successfully created local release"

# check binary compatibility for dry run
if [ ! $no_mima ] && [ $dry_run ]; then
  echodry "Running migration manager report..."
  sbt mima-report-binary-issues
  echodry "Finished migration manager report"
fi

# commit and tag this release
echolog "Committing and tagging..."
try git add .
try git commit -am "Update version for release ${version}"
try git tag -am "Version ${version}" v${version}

# the point of no return... we're now pushing out to servers

# use a special failure from now on
function arrgh {
  cat 1>&2 <<EOM
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

  Release failed while pushing to servers!

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
EOM
  fail "Could not complete release - please check current state"
}

# try running a pushing command or otherwise fail
function important {
  "$@" || arrgh
}

# new interrupted bail out for signals
function arrgh_interrupt {
  echoerr "Interrupted by signal"
  arrgh
}

# new exit on signals
trap arrgh_interrupt SIGHUP SIGINT SIGTERM

# push the commits and tags to git origin
echolog "Pushing to git origin..."
if [ $dry_run ]; then
  echodry "Not actually pushing to git origin. Commands:"
  echodry "  git push origin --tags"
else
  important git push origin --tags
fi

# push the release to the server
echolog "Pushing ${release_dir} to ${publish_path} ..."
if [ $dry_run ]; then
  echodry "Not actually pushing to server. Command:"
  echodry "  rsync -rlpvz --chmod=Dg+ws,Fg+w --exclude ${release_dir}/downloads ${release_dir}/ ${publish_path}/"
  echodry "  sbt upload-release"
else
  important rsync -rlpvz --chmod=Dg+ws,Fg+w --exclude ${release_dir}/downloads ${release_dir}/ ${publish_path}/
  important sbt upload-release
fi

echolog "Updating http://doc.akka.io/docs/versions.json [from $script_dir/../../akka-docs/versions.json]..."
if [ $dry_run ]; then
  echodry "Not actually updating versions.json. Command:"
  echodry "  important scp $script_dir/../../akka-docs/versions.json ${publish_path}/docs/"
else
  important scp $script_dir/../../akka-docs/versions.json ${publish_path}/docs/
fi

if [ $dry_run ]; then
  if [ $no_revert ]; then
    echodry "No revert: git branch ${release_branch} and git tag v${version} remain"
  else
    git_cleanup
  fi
  echodry "Successfully created release ${version}"
  echodry "See ${release_dir}"
else
  echolog "Switching back to initial branch"
  git checkout ${initial_branch}
  echolog "Successfully created release ${version}"
fi