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#!/bin/bash
#
# Drupal management script.
#

BASE=${BASE:="/var/www/data"}
SITES=${SITES:="$BASE/drupal"}
SERIES="6 7 8"

# Ensure we have a proper path, useful when called through cron
export PATH='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'

# Read a parameter from user
function drupal_user_input {
  local input
  param="$1"
  default="$2"
  shift 2

  if echo $param | grep -q 'passwd'; then
    read -s -rep "$* (defaults to $default): " input
  else
    read -rep "$* (defaults to $default): " input
  fi

  if [ -z "$input" ]; then
    export $param="$default"
  else
    export $param="$input"
  fi
}

# Get drupal major version
function drupal_get_major {
  echo $1 | sed -e 's/\(^.\).*/\1/'
}

# Check for existing installations
function drupal_check_existing {
  if [ -e "$BASE/drupal-$1" ]; then
    echo "Folder $BASE/drupal-$1 already exists, skipping"
    exit 1
  fi  
}

# Check for non existing installations
function drupal_check_not_existing {
  if [ ! -e "$BASE/drupal-$1" ]; then
    echo "Folder $BASE/drupal-$1 does not exist, skipping"
    exit 1
  fi  
}

# Iterate through all drupal instances
function drupal_iterate {
  local command="$1"

  if [ -z "$command" ]; then
    return
  fi

  if [ "$command" != "cron" ] && [ "$SILENT" != "yes" ]; then
    echo "Issuing $command in all installed instances..."
  fi

  for version in $SERIES; do
    # Setup base folder
    base="$BASE/drupal-$version"

    if [ ! -d "$base/sites" ]; then
      continue
    fi

    # Setup site folders with .onion sites in the end of the list
    # and ignoring site names without dots
    cd $base/sites
    drupals="`ls -1 -I default -I all -I example.sites.php -I '*.onion' | grep "\." | xargs`"
    drupals="$drupals `ls -1 | grep '.onion$' | xargs`"
  
    # Issue updates
    for drupal in $drupals; do
      if [ -e "$drupal/settings.php" ]; then
        hash="`sha1sum $drupal/settings.php | cut -d ' ' -f 1`"
        # Process sites just once, avoiding symlinks
        if echo $settings_hash | grep -q -v "$command:$hash"; then
          settings_hash="$settings_hash-$command:$hash"
          if [ "$command" != "cron" ] && [ "$SILENT" != "yes" ]; then
            echo "Processing $drupal..."
          fi

          if [ "$command" == "update" ] || [ "$command" == "cron-update" ]; then
            shift
            drupal_update $command $drupal $*
          else
            drush -l $drupal $*
          fi
        fi
      fi
    done
  
    # Fix permissions
    chown -R root.root $base/modules
    chown -R root.root $base/themes
    if [ -e "$base/sites/all/modules" ]; then
      chown -R root.root $base/sites/all/modules
    fi
    if [ -e "$base/sites/all/themes" ]; then
      chown -R root.root $base/sites/all/themes
    fi
  done
}

# Update a drupal instance
function drupal_update {
  local method="$1"
  local instance="$2"
  local confirm
  local line
  shift 2

  if [ "$method" == "cron-update" ]; then
    confirm="-y"
  fi

  # See https://drupal.org/node/823146#comment-3319070
  drush -l $instance up -u 1 --pipe | \
    grep -v -E 'Unknown|Up-to-date|Atualizado|Desconhecido|^Array$|^\($|^\)$|OK' | while read line ; do
    # Avoid automated core updates
    code="`echo $line | cut -d " " -f1`"
    if [ "$code" == "drupal" ]; then
      echo "Core update available: $line"
    else
      echo "Updating $code on instance $instance..."
      drush -l $instance up -u 1 $confirm $* $code
    fi
  done
}

# Deploy a fresh drupal tree
function drupal_download {
  if [ -z "$1" ]; then
    echo "Usage: `basename $0` download <version> [--upgrade]"
    exit 1
  fi

  # Setup
  new="$1"
  drupal_series="`drupal_get_major $new`"
  cd $BASE
  drupal_check_existing $new

  # Deploy a fresh drupal tree
  wget http://ftp.drupal.org/files/projects/drupal-$new.tar.gz
  tar zxvf drupal-$new.tar.gz && rm drupal-$new.tar.gz
  chown -R root.root drupal-$new/

  # Upgrade mode, erase sites folder as the previous should be copied.
  if [ "$2" == "--upgrade" ]; then
    cd drupal-$new && rm -rf sites
  fi

  # Make symlink if needed.
  if [ ! -e "$BASE/drupal-$drupal_series/CHANGELOG.txt" ]; then
    # Deal with a possibly empty drupal folder
    rmdir $BASE/drupal-$drupal_series &> /dev/null
    ( cd $BASE && ln -s drupal-$new drupal-$drupal_series )
  fi
}

# Upgrade a drupal instance using upstream source
function drupal_upgrade {
  if [ "$#" != "2" ]; then
    echo "Usage: `basename $0` upgrade <old_version> <new_version>"
    exit 1
  fi

  # Setup
  old="$1"
  new="$2"
  old_major="`drupal_get_major $old`"
  new_major="`drupal_get_major $new`"
  extra_folders=""
  drupal_series="$new_major"
  
  if [ "$old_major" != "$new_major" ]; then
    echo "Major versions doesn't match"
    exit 1
  fi

  drupal_check_existing $new
  drupal_check_not_existing $old
  
  cd $BASE
  
  # Deploy a fresh drupal tree
  drupal_download $new --upgrade

  # Ensure we're in the new drupal folder
  cd $BASE/drupal-$new

  # Copy files
  for file in sites; do
    if [ ! -h "../drupal-$old/$file" ]; then
      cp -a ../drupal-$old/$file . &> /dev/null
    else
      # Symlink handling
      ln -sf $file `readlink ../drupal-$old/$file`
    fi
  done

  # Extra folder
  for extra_folder in $extra_folders; do
    if [ -d ../drupal-$old/$extra_folder ]; then
      cp -Rp ../drupal-$old/$extra_folder .
    fi
  done
  
  # Copy installation profiles
  rsync -av --exclude=default ../drupal-$old/profiles/ profiles/

  # Copy installation themes and modules for Drupal 8 or newer
  if [ "$new_major" != "5" ] && [ "$new_major" != "6" ] && [ "$new_major" != "7" ]; then
    rsync -av ../drupal-$old/modules/ modules/
    rsync -av ../drupal-$old/themes/  themes/
  fi

  # Change symlink to point to the new location
  cd $BASE ; rm -rf drupal-$drupal_series && ln -s drupal-$new drupal-$drupal_series

  # Done
  echo "Audit: `du -hs drupal-$old`"
  echo "Audit: `du -hs drupal-$new`"
  echo "Check procedure and remove drupal-$old once you make sure that everything is fine."
}

# Run a drupal makefile
function drupal_make {
  if [ -z "$1" ]; then
    echo "Usage: `basename $0` make <series>"
    exit 1
  fi

  series="$1"
  base="$BASE/drupal-$series"
  makefile="/usr/local/share/drupal/drupal$series.make"
  makefile_themes="/usr/local/share/drupal/themes$series.make"

  if [ -e "$makefile" ]; then
    if [ ! -e "$base" ]; then
      echo "Please download drupal code at $base first"
      exit 1
    fi
    drush dl drush_make
    ( cd $base && drush make -y --no-core $makefile )
    ( cd $base && drush make -y --no-core $makefile_themes )
  else
    echo "Makefile not found: $makefile"
    exit 1
  fi
}

# Install a new instance
function drupal_install {
  if [ -z "$2" ]; then
    echo "Usage: `basename $0` install <series> <name> [aliases]"
    exit 1
  fi

  # Required arguments
  series="$1"
  site="$2"
  shift 2

  # Site aliases
  aliases="$*"

  # Other parameters
  domain="`facter domain`"

  if [ "$series" != "6" ]; then
    # Installation parameters
    drupal_user_input name        "$site"                    "Site name"
    drupal_user_input site_email  "$site@$domain"            "Site email"
    drupal_user_input profile     "standard"                 "Installation profile"
    drupal_user_input locale      "pt-br"                    "Installation language"
    drupal_user_input admin       "$site"                    "Admin user"
    drupal_user_input admin_email "$admin@$domain"           "Admin email"
  fi

  if [ -e "$BASE/drupal-$series/sites/$site" ]; then
    echo "Drupal $site already installed at $BASE/drupal-$series"
    echo "Installation will be overwritten"
  else
    # Check installation
    if [ ! -e "$BASE/drupal-$series" ]; then
      echo "Please download your drupal $series farm first"
      exit 1
    fi  

    echo "Creating $SITES/$site/drupal/ structure..."
    mkdir -p $SITES/$site/drupal/{files,themes,modules,libraries}

    echo "Copying default configuration file..."
    cp $BASE/drupal-$series/sites/default/default.settings.php $SITES/$site/drupal/settings.php
    chmod 640 $SITES/$site/drupal/settings.php

    (
    echo "Creating symlinks..."
    cd $BASE/drupal-$series/sites
    ln -s $SITES/$site/drupal $site
    ln -s $SITES/$site/drupal $site.$domain

    for alias in $aliases; do
      ln -s $SITES/$site/drupal $alias
    done
    )

    # Aditional parameters
    drupal_user_input dbname      "$site"                    "Database name"
    drupal_user_input dbuser      "$site"                    "Database user"
    drupal_user_input dbpasswd    "$site"                    "Database passwd"
    echo ""

    echo "Configuring settings.php"
    if [ "$series" == "7" ]; then
      cat >> $SITES/$site/drupal/settings.php <<-EOF
\$databases['default']['default'] = array(
'driver'   => 'mysql',
'database' => '$dbname',
'username' => '$dbuser',
'password' => '$dbpasswd',
'host'     => 'localhost',
'prefix'   => '',
);
EOF
    elif [ "$series" == "6" ]; then
      cat >> $SITES/$site/drupal/settings.php <<-EOF
\$db_url = 'mysql://$dbuser:$dbpasswd@localhost/$dbname';
EOF
    fi
  fi

  if [ "$series" != "6" ]; then
    (
    echo "Installing drupal $series for $site using $profile profile..."
    cd $BASE/drupal-$series/
    drush site-install $profile --site-name="$name" --site-mail="$site_email" --locale=$locale \
      --uri="$site" --sites-subdir="$site" --account-name="$admin" --account-mail="$admin_email"
    )
  fi

  # Fix permissions
  if grep -qe "^$site:" /etc/passwd; then
    chown root.$site  $SITES/$site/drupal/settings.php
    chown $site.$site $SITES/$site/drupal/{files,themes,modules,libraries}
  else
    chown root.www-data     $SITES/$site/drupal/settings.php
    chown www-data.www-data $SITES/$site/drupal/{files,themes,modules,libraries}
  fi

  if [ "$series" == "6" ]; then
    echo "Now please access http://$site.$domain/install.php to continue with the installation."
  else
    echo "Done. Please check your installation."
  fi
}

# Main procedure
if [ -z "$1" ]; then
  echo "Usage: `basename $0` <cron|download|update|updatedb|upgrade|run|make|install> [arguments]"
  exit 1
elif [ "$1" == "cron" ]; then
  drupal_iterate cron
elif [ "$1" == "cron-update" ]; then
  SILENT="yes"
  drupal_iterate pm-refresh &> /dev/null
  drupal_iterate cron-update
elif [ "$1" == "download" ] || [ "$1" == "dl" ]; then
  shift
  drupal_download $*
elif [ "$1" == "update" ]; then
  shift
  drupal_iterate pm-refresh
  drupal_iterate update $*

  # Update alone might not trigger updatedb in a farm for all instances.
  drupal_iterate updatedb $*
  drupal_iterate cc all $*
elif [ "$1" == "updatedb" ]; then
  shift
  drupal_iterate updatedb $*
elif [ "$1" == "upgrade" ]; then
  shift
  drupal_upgrade $*
elif [ "$1" == "run" ]; then
  shift
  drupal_iterate $*
elif [ "$1" == "make" ]; then
  shift
  drupal_make $*
elif [ "$1" == "install" ]; then
  shift
  drupal_install $*
else
  echo "No action $1"
  exit 1
fi