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#!/usr/bin/env bash
# Librerelease
# Uploads packages and releases them

# Copyright (C) 2010-2012 Joshua Ismael Haase Hernández (xihh) <hahj87@gmail.com>
# Copyright (C) 2010-2013 Nicolás Reynolds <fauno@parabola.nu>
# Copyright (C) 2013 Michał Masłowski <mtjm@mtjm.eu>
# Copyright (C) 2013-2014, 2017-2018 Luke Shumaker <lukeshu@parabola.nu>
# Copyright (C) 2020 bill-auger <bill-auger@programmer.net>
#
# For just the create_signature() function:
#   Copyright (C) 2006-2013 Pacman Development Team <pacman-dev@archlinux.org>
#   Copyright (C) 2002-2006 Judd Vinet <jvinet@zeroflux.org>
#   Copyright (C) 2005 Aurelien Foret <orelien@chez.com>
#   Copyright (C) 2006 Miklos Vajna <vmiklos@frugalware.org>
#   Copyright (C) 2005 Christian Hamar <krics@linuxforum.hu>
#   Copyright (C) 2006 Alex Smith <alex@alex-smith.me.uk>
#   Copyright (C) 2006 Andras Voroskoi <voroskoi@frugalware.org>
#
# License: GNU GPLv3+
#
# This file is part of Parabola.
#
# Parabola is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Parabola is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Parabola. If not, see <http://www.gnu.org/licenses/>.

# create_signature() is taken from pacman:makepkg, which is GPLv2+,
# so we take the '+' to combine it with our GPLv3+.


set -euE

source "$(librelib conf)"
source "$(librelib messages)"

setup_traps

dryrun=""
upload_only=false
readonly rsync_flags=(
  --no-group
  --no-perms
  --copy-links
  --hard-links
  --partial
  --human-readable
  --progress
)


# Functions ####################################################################

list0_files() {
  find -L "${WORKDIR}/staging" -type f -not -name '*.lock' \
    -exec realpath -z --relative-to="${WORKDIR}/staging" {} +
}

# This function is taken almost verbatim from makepkg
create_signature() {
  local ret=$EXIT_SUCCESS
  local filename="$1"
  msg "Signing package..."

  local SIGNWITHKEY=()
  if [[ -n $GPGKEY ]]; then
    SIGNWITHKEY=(-u "${GPGKEY}")
  fi

  gpg --detach-sign --use-agent "${SIGNWITHKEY[@]}" --no-armor "$filename" &>/dev/null || ret=$EXIT_FAILURE

  if (( ! ret )); then
    msg2 "Created signature file %s." "$filename.sig"
  else
    error "Failed to sign package file."
    return $ret
  fi
}

sign_packages() {
  IFS=$'\n'
  local files=($(find "${WORKDIR}/staging/" -type f -not -iname '*.sig' -print))
  local file
  for file in "${files[@]}"; do
    if [[ -f "${file}.sig" ]]; then
      msg2 "File signature found, verifying..."

      # Verify that the signature is correct, else remove for re-signing
      if ! gpg --quiet --verify "${file}.sig" >/dev/null 2>&1; then
        error "Failed!  Re-signing..."
        rm -f "${file}.sig"
      fi
    fi

    if ! [[ -f "${file}.sig" ]]; then
      create_signature "$file" || return
    fi
  done
}

# Clean everything if not in dry-run mode
clean_files() (
  local file_list=$1

  local rmcmd=(rm -fv)
  if [[ -n "${dryrun}" ]]; then
    rmcmd=(printf "$(_ "removed '%s' (dry-run)")\n")
  fi

  msg "Removing files from local staging directory"
  cd "${WORKDIR}/staging"
  xargs -0r -a "$file_list" "${rmcmd[@]}"
  find . -depth -mindepth 1 -type d \
       -exec rmdir --ignore-fail-on-non-empty -- '{}' +
)

################################################################################

usage() {
  print "Usage: %s [OPTIONS]" "${0##*/}"
  print 'Upload packages in $WORKDIR/staging to the Parabola server'
  echo
  prose 'By default, `librerelease` expects the $LIBREUSER
         to match the hackers.git login for which $LIBREUSER has credentials.'
  prose '$LIBREUSER is determined at runtime, per /usr/lib/libretools/conf.sh.
         $LIBREUSER is normally the login of the invoking user, per $SUDO_USER;
         but may be over-ridden by setting $LIBREUSER
         in the `configuration` section of conf.sh.'
  prose 'If $LIBREUSER does not match the hackers.git login,
         for which $LIBREUSER has the repo login credentials,
         you must specify `$REPOUSER` as the remote login,
         in the `configuration` section of conf.sh.'
  echo
  print "Options:"
  flag '-c'            'Clean; delete packages in $WORKDIR/staging'
  flag '-l'            "List; list packages but not upload them"
  flag '-u'            "Upload-only; do not run db-update on the server"
  flag '-n'            "Dry-run; don't actually do anything"
  flag '-h'            "Show this message"
}

main() {
  if [[ -w / ]]; then
    error "This program should be run as regular user"
    return $EXIT_NOPERMISSION
  fi

  # Parse options
  local mode="release_packages"
  while getopts 'clunh' arg; do
    case $arg in
      c) mode=clean ;;
      l) mode=pretty_print_packages ;;
      u) upload_only=true ;;
      n) dryrun="--dry-run" ;;
      h) mode=usage ;;
      *) usage >&2; return $EXIT_INVALIDARGUMENT ;;
    esac
  done
  shift $((OPTIND - 1))
  if [[ $# != 0 ]]; then
    usage >&2
    return $EXIT_INVALIDARGUMENT
  fi

  if [[ $mode == usage ]]; then
    usage
    return $EXIT_SUCCESS
  fi

  declare -i ret=0
  load_conf makepkg.conf GPGKEY || ret=$?
  load_conf libretools.conf WORKDIR REPODEST DBSCRIPTS_CONFIG || ret=$? # and HOOK{PRE,POST}RELEASE, which are optional
  [[ $ret = 0 ]] || exit $ret

  local re_url='^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?$'
  local re_authority='^(([^@]*)@)?([^][@:]*|\[[^]]*\])(:([0-9]*))?$'
  local REPODEST_ok=false
  if [[ "$REPODEST" =~ $re_url ]]; then
    REPODEST_ok=true

    REPODEST_scheme=${BASH_REMATCH[2]}
    REPODEST_authority=${BASH_REMATCH[4]}
    REPODEST_path=${BASH_REMATCH[5]}
    REPODEST_query=${BASH_REMATCH[7]}
    REPODEST_fragment=${BASH_REMATCH[9]}

    if [[ "$REPODEST_authority" =~ $re_authority ]]; then
      REPODEST_userinfo=${BASH_REMATCH[2]}
      REPODEST_host=${BASH_REMATCH[3]}
      REPODEST_port=${BASH_REMATCH[5]}

      if [[ "$REPODEST_host" = '['*']' ]]; then
        REPODEST_host=${REPODEST_HOST#'['}
        REPODEST_host=${REPODEST_HOST#']'}
      fi
    else
      REPODEST_ok=false
    fi

    [[ $REPODEST_scheme == ssh ]] || REPODEST_ok=false
    [[ -n $REPODEST_host ]] || REPODEST_ok=false
    [[ -n $REPODEST_path ]] || REPODEST_ok=false
  fi
  if ! $REPODEST_ok; then
    error 'The format of libretools.conf:REPODEST has changed.'
    plain 'Merge the /etc/libretools.conf.pacnew file!'
    return $EXIT_NOTCONFIGURED
  fi
  if [[ "$REPODEST_path" = '/~'* ]]; then
    if [[ "$REPODEST_path" = '/~/'* ]]; then
      REPODEST_path=${REPODEST_path#'/~/'}
    else
      error 'Unfortunately, `~user` home-directory expansion is not (yet?) supported in libretools.conf:REPODEST'
      return $EXIT_NOTCONFIGURED
    fi
  fi
  REPODEST_userhost="${REPODEST_userinfo:+${REPODEST_userinfo%%:*}@}${REPODEST_host}"

  "$mode"
}

# The different modes (sans 'usage') ###########################################

pretty_print_packages() {
  find "$WORKDIR/staging/" -mindepth 1 -maxdepth 1 -type d -not -empty | sort |
  while read -r path; do
    msg2 "${path##*/}"
    cd "$path"
    find -L . -type f -not -name '*.lock' | sed 's|^\./|     |' | sort
  done
}

clean() {
  lock 8 "${WORKDIR}/staging.lock" \
    'Waiting for an exclusive lock on the staging directory'

  local file_list
  file_list="$(mktemp -t "${0##*/}.XXXXXXXXXX")"
  trap "rm -f -- ${file_list@Q}" EXIT
  list0_files > "$file_list"

  lock_close 8

  clean_files "$file_list"
}

release_packages() {
  if [[ -n $HOOKPRERELEASE ]]; then
    msg "Running HOOKPRERELEASE..."
    (
      PS4="   \\[$BOLD\\]\$\\[$ALL_OFF\\] "
      eval -- "set -x; $HOOKPRERELEASE"
    )
  fi

  lock 8 "${WORKDIR}/staging.lock" \
    'Waiting for an exclusive lock on the staging directory'

  sign_packages || return

  # Make the permissions of the packages 644 otherwise the user will get access
  # denied error when they try to download (rsync --no-perms doesn't seem to
  # work).
  find "${WORKDIR}/staging" -type f -exec chmod 644 {} +
  find "${WORKDIR}/staging" -type d -exec chmod 755 {} +

  local file_list="$(mktemp -t ${0##*/}.XXXXXXXXXX)"
  trap "rm -f -- ${file_list@Q}" EXIT
  list0_files > "$file_list"

  lock_close 8

  msg "%s to upload" "$(cd "${WORKDIR}/staging" && du -hc --files0-from="$file_list" | sed -n '$s/\t.*//p')"
  msg "Uploading packages..."
  xargs -0r -a "$file_list" dirname -z | ssh ${REPODEST_port:+-p "$REPODEST_port"} "${REPODEST_userhost}" "mkdir -p -- ${REPODEST_path@Q} && cd ${REPODEST_path@Q} && xargs -0r mkdir -pv --"
  if ! rsync ${dryrun} "${rsync_flags[@]}" \
    -e "ssh ${REPODEST_port:+-p $REPODEST_port}" \
    -0 --files-from="$file_list" \
    "${WORKDIR}/staging" \
    "$REPODEST_userhost:$REPODEST_path/"
  then
    error "Sync failed, try again"
    return $EXIT_FAILURE
  fi

  clean_files "$file_list"

  if $upload_only; then
    return $EXIT_SUCCESS
  fi

  msg "Running db-update on repos"
  # eg: ssh -p 1863 autobuilder@repo.parabola.nu STAGING='staging/' DBSCRIPTS_CONFIG='/etc/dbscripts/config.local.parabola' db-update
  ssh ${REPODEST_port:+-p "$REPODEST_port"} "${REPODEST_userhost}" "STAGING=${REPODEST_path@Q} DBSCRIPTS_CONFIG=${DBSCRIPTS_CONFIG@Q} db-update"

  if [[ -n $HOOKPOSTRELEASE ]]; then
    msg "Running HOOKPOSTRELEASE..."
    (
      PS4="   \\[$BOLD\\]\$\\[$ALL_OFF\\] "
      eval -- "set -x; $HOOKPOSTRELEASE"
    )
  fi

  # notify pbot of the excellent work we have done
  local login=${REPODEST_userinfo:-somebody} ; login=${login%%:*} ;
  local select_pkgs='\.pkg\.tar\.[^\.]+$'
  local reject_pkgs='\-debug\-'
  local pkgname_rx='s|\([^/]*\)/\([^/ ]*\)-[^-]*$|\2(\1) |'
  local packages=$(grep -zE  "${select_pkgs}" ${file_list} | \
                   grep -zEv "${reject_pkgs}"              | \
                   sed -z    "${pkgname_rx}"               | \
                   sort -zu | xargs -0                       )
  local pbotsay_fmt="which pbot-say && pbot-say %s just published: %s"

  if [[ -n "$(echo ${packages})" ]]; then
    local pbotsay_cmd="$(printf "${pbotsay_fmt}" "${login}" "${packages}")"
    ssh ${REPODEST_port:+-p "$REPODEST_port"} "${REPODEST_userhost}" "${pbotsay_cmd}"
  fi

  return $EXIT_SUCCESS
}

main "$@"