drupal_copy_code

#!/bin/bash

## Copy Drupal code from local Webhead to its fellow Webheads
##
## Order of operations:
## 1. Test ability to use drush to connect to each group of test, stage or production Drupal instances
## 2. Put the local (source) Drupal instance into ready-only maintenance mode
## 3. Rsync Drupal code files from the local Webhead to its fellow Webheads
## 4  Apply any db changes, clear the Drupal cache, and turn maintenance mode off
##

# Must be this user to run this script
# Assume that this user's ~/.ssh/known_hosts on the remote machine already has
#   an entry for the local machine
USER=druadmin
if [ "`/usr/bin/id -urn`" != "$USER" ] ; then
	echo "You must be the $USER user to execute this script - exiting."
	exit 1
fi

# Avoid being in the Drupal root tree to avoid built-in aliases (e.g. @self)
cd $HOME

DRUSH="/usr/local/bin/drush"

# STEP 1 ---------------------------------------------------------------------------------------------------------------------------
echo -e "\nSTEP 1"

# Get local drush alias
# All drush aliases can be found in /home/$USER/.drush/aliases.drushrc.php
SRC_ALIAS=`$DRUSH site-alias --local`
if [ $? -ne 0 ] ; then
	echo -e "\nUnable to get source alias for local Drupal instance - exiting."
	exit 1
fi

# Expected drush alias format is rhel-test[digits], rhel-stage[digits], rhel-prod[digits]
BASE_ALIAS=`echo $SRC_ALIAS | sed 's/[0-9]*$//'`
echo -e "\nCollecting variables from all $BASE_ALIAS Drupal instances."

# Get drush aliases for fellow sites
DEST_ALIASES=`$DRUSH site-alias | grep -v $SRC_ALIAS | grep $BASE_ALIAS`
if [ -z "$DEST_ALIASES" ] ; then
	echo -e "\nUnable to get destination aliases - exiting."
	exit 1
fi

# Get URIS for local and fellow sites
SRC_URI="`$DRUSH site-alias --field-labels=0 --fields=uri --format=list @$SRC_ALIAS`"
if [ -z "$SRC_URI" ] ; then
	echo -e "\nNo source webheads found - exiting."
	exit 1
fi
DEST_URIS=""
for ALIAS in $DEST_ALIASES ; do
        DEST_URIS="$DEST_URIS `$DRUSH site-alias --field-labels=0 --fields=uri --format=list @$ALIAS`"
done
if [ -z "$DEST_URIS" ] ; then
	echo -e "\nNo destination webheads found - exiting."
	exit 1
fi

# Determine Drupal Code directory: it is the same on source and all destinations

# Ask source for its Drupal root directory
SRC_ROOT_DIR=`$DRUSH site-alias --field-labels=0 --fields=root --format=list @$SRC_ALIAS 2>/dev/null`
if [ $? -ne 0 ] ; then
        echo -e "\nUnable to determine $SRC_ALIAS root directory - exiting."
        exit 1
fi
# Drupal code directory is one level above
DRUPAL_CODE_DIR=`dirname $SRC_ROOT_DIR 2>/dev/null`
if [ $? -ne 0 ] ; then
        echo -e "\nUnable to determine $SRC_ALIAS code directory - exiting."
        exit 1
fi

echo -e "\nSucessfully connected to $SRC_ALIAS and $DEST_ALIASES Drupal instances."

# STEP 2 ---------------------------------------------------------------------------------------------------------------------------
echo -e "\n\nSTEP 2"

# Put local Drupal instance into maintenance (read-only) mode
echo -e "\nPutting the $SRC_ALIAS Drupal instance into maintenance mode."
$DRUSH @$SRC_ALIAS vset maintenance_mode 1

# STEP 3 ---------------------------------------------------------------------------------------------------------------------------
echo -e "\n\nSTEP 3"

# Copy the Drupal code files from here to $DEST_URIS

# Rsync options being used:
# -c = decision to skip is based on checksum, not on (default) modification time & size
# -r = recurse into directories
# -l = copy symlinks as symlinks
# -g = preserve group ($USER owns the files)
# -o = preserve owner ($USER owns the files)
# -p = preserve permissions ($USER owns the files)
# -t = preserve times ($USER owns the files)
# -H = preserve hard links
# -v = increase verbosity
# --delete = delete extraneous files from dest dirs - for example if need to remove obsolete code/modules
# --safe-links = ignore symlinks that point outside the tree - don't have examples of any symlinks
# --temp-dir = create temporary files in directory DIR

# Appending a slash to the source directory name causes rsync to copy the contents
# Otherwise, rsync would copy the directory itself
for DEST_URI in $DEST_URIS; do
        echo -e "\nCopying Drupal code files from here to $DEST_URI."
        rsync -e 'ssh' -c -r -l -g -o -p -t -H -v	\
		--delete --safe-links --temp-dir=/tmp	\
		$DRUPAL_CODE_DIR/ $DEST_URI:$DRUPAL_CODE_DIR
done

# STEP 4 ---------------------------------------------------------------------------------------------------------------------------
echo -e "\n\nSTEP 4"

# Apply any database changes.
echo -e "\nApplying any database changes."
$DRUSH @$SRC_ALIAS -y updatedb

# Clear the cache
echo -e "\nClearing the Drupal cache."
$DRUSH @$SRC_ALIAS -y cache-clear all

# Turn maintenance mode off
echo -e "\nTurning maintenance mode off."
$DRUSH @$SRC_ALIAS vset maintenance_mode 0

# Clear the cache again to be sure maintenance mode is not preserved
echo -e "\nClearing the Drupal cache."
$DRUSH @$SRC_ALIAS -y cache-clear all

# All done
echo -e "\nCopying of code from here to$DEST_URIS is complete."