#!/bin/bash

# This script is a one-off script to move the shared files on a
# mySociety instance of Alaveteli out of the repository and into the
# vhost's shared directory.  This is specific to mySociety's servers -
# the list of files and directories which are moved would be unlikely
# to be correct in another environment.
#
# This should be run *before* the first time the site is deployed with
# the timestamped_deploy option.

set -e

# (Using `pwd -P` here instead of readlink -f so that it works on Mac
# OS as well, just in case that's required for testing on a laptop.)
RAILS_ROOT="$(cd "$(dirname "$BASH_SOURCE")/.." && pwd -P)"
VHOST_DIR="$(cd "$RAILS_ROOT/.." && pwd -P)"
SHARED_DIR="$VHOST_DIR/shared"

cd "$RAILS_ROOT"

mkdir -p "$SHARED_DIR"

for F in \
    cache \
    public/foi-live-creation.png \
    public/foi-user-use.png \
    config/aliases \
    lib/acts_as_xapian/xapiandbs \
    vendor/bundle
do
    SYMLINK_LOCATION="$F"
    INTENDED_DESTINATION="$SHARED_DIR/$F"
    echo "Switching to $SYMLINK_LOCATION -> $INTENDED_DESTINATION"
    # If anything exists where the symlink should be:
    if [ -e "$SYMLINK_LOCATION" ]
    then
        # First, if it's a symlink, check whether it's correct:
        if [ -L "$SYMLINK_LOCATION" ]
        then
            SYMLINK_DESTINATION="$(readlink "$SYMLINK_LOCATION")"
            if [ "$SYMLINK_DESTINATION" = "$INTENDED_DESTINATION" ]
            then
                echo "  already correct!"
            else
                echo "  ERROR: already symlinked to $INTENDED_DESTINATION"
            fi
        else
            # So the file or directory is there, and it's not a
            # symlink.  Check first that that destination doesn't
            # exist (in which case a move would either fail or
            # overwrite what's there):
            if [ -e "$INTENDED_DESTINATION" ]
            then
                echo "   ERROR: would move, but something already existed at $INTENDED_DESTINATION"
            else
                # Otherwise (bar race condition) everything's fine,
                # and we should be able to move the file or directory
                # and create a symlink to its new location:
                mkdir -p "$(dirname "$INTENDED_DESTINATION")"
                mv "$SYMLINK_LOCATION" "$INTENDED_DESTINATION"
                ln -snf "$INTENDED_DESTINATION" "$SYMLINK_LOCATION"
            fi
        fi
    else
        # This may not be anything to worry about, e.g. if the
        # public/foi-user-use.png graph has never been generated:
        echo "  ERROR: nothing existed at $SYMLINK_LOCATION"
    fi

done