Workaround for pg_dump non-idempotent behaviour

Problem
=======

* `pg_dump` may dump the data rows in arbitrary order. This messes with
  the final hash of the dump file, even though the data after restoring
  would be same. This creates additional uploads with no value

Solution
========

* Utilize `pgdump-sort` script by `tigra564`, which attempts to sort
  data in the dump file specifically for hashing purposes.

backup-bitwarden.sh

@@ -2,15 +2,20 @@
 
 set -euo pipefail
 
+scriptpath="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+
 dumpfile="dump.sql"
 
 tmpdir="$(mktemp -d -p "${PWD}")"
 
 function check_for_hash() {
     local ret=0
-    echo "Checking if hash ${1} is present"
+    echo -n "Checking if hash ${1} is present: "
     aws s3 ls "s3://${S3_BUCKET}/sums/${1}" || ret=$?
-    echo "Returned: ${ret}"
+		case "$ret" in
+				0) echo "Yes." ;;
+				*) echo "No." ;;
+		esac
     return $ret
 }
 
@@ -18,6 +23,7 @@ function create_and_upload() {
     local sum=$1
     local backup_file
     backup_file="$(date +%Y/%m/backup-%d-%H-%M-%S.tar.gz)"
+		echo "Uploading ${backup_file}"
     tar -zc . | aws s3 cp - "s3://${S3_BUCKET}/${backup_file}"
     aws s3api put-object --bucket "${S3_BUCKET}" --key "sums/${sum}"
 }
@@ -29,16 +35,17 @@ pushd "${tmpdir}"
 rm -rf "${dumpfile}"
 touch "${dumpfile}"
 chmod ugo+w "${dumpfile}"
-sudo -u postgres -- pg_dump --no-owner --no-privileges --clean --if-exists --quote-all-identifiers "${DATABASE_URL}" -F plain -f "${dumpfile}"
+sudo -u postgres -- pg_dump --no-owner --no-privileges --clean --if-exists --quote-all-identifiers "${DATABASE_URL}" -f "${dumpfile}"
+
+"${scriptpath}/pgdump-sort" "${dumpfile}" "sorted.sql"
 
 cp -r "${ROOT_DIR}/data" "./data"
 cp "${ROOT_DIR}/.env" "./.env"
 cp "${ROOT_DIR}/bitwarden.exceede.com.conf" "./bitwarden.exceede.com.conf"
 
-# remove icon_cache
-rm -rf ./data/icon_cache
+sum=$(find . -type f -not -name "${dumpfile}" -and -not -path "./data/icon_cache/*" -exec md5sum {} + | LC_ALL=C sort | md5sum | cut -d ' ' -f 1)
 
-sum=$(find . -type f -exec md5sum {} + | LC_ALL=C sort | md5sum | cut -d ' ' -f 1)
+rm sorted.sql
 
 check_for_hash "$sum" || create_and_upload "${sum}"