from synology-gitlab-jboxberger package to this package

Migration only works within a version. restoring a backup from version 11.5.0 to 11.5.1 or from 11.5.1 to 11.5.0 will NOT work

Prev. Version	New Version	Status
11.0.4-0101	11.0.4-0053	full migration needed*
11.4.0-0102	11.4.0-0053	full migration needed*
11.5.1-0102	11.5.1-0053	full migration needed*

# migration synology-gitlab-jboxberger to synology-gitlab

# 1. create backup and save it from deletion
  sudo mkdir /volume1/docker/gitlab-backup
  sudo /usr/local/bin/docker exec -it synology_gitlab bash -c "sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production"
  sudo cp -p /volume1/docker/gitlab/backups/*_gitlab_backup.tar /volume1/docker/gitlab-backup

# 2. uninstall currently installed giltab package (do *NOT* Remove GitLab data) - save database password (required for rollback).

# 3. move old gitlab data out of the way.
  sudo mv /volume1/docker/gitlab /volume1/docker/gitlab.backup
  sudo mv /volume1/docker/gitlab-db /volume1/docker/gitlab-db.backup

# 4. install the synology-gitlab package with the same version as the prevous synology-gitlab-jboxberger package.

# 5. Restore the backup files and gitlab content
  sudo cp -p /volume1/docker/gitlab-backup/*_gitlab_backup.tar /volume1/docker/gitlab/gitlab/backups

# (file_name)'1547251748_2019_01_12_11.5.0_gitlab_backup.tar' => <backup_name>'1547251748_2019_01_12_11.5.0'
  sudo /usr/local/bin/docker exec -it synology_gitlab bash -c "sudo -u git -H bundle exec rake gitlab:backup:restore RAILS_ENV=production BACKUP=<backup_name>"

# 6. Test your environment as carefull as possible. Take time for testing.
# Depending on your testing result plseas continue with 6.1 or 6.2
# If you get a 422 GitLab error, please clear the whole broswer cache including data and cookies.

# 6.1 Oh...Oh...! Something is broken... Restore11!
# Uninstall currently installed synology-gitlab package (check delete database)
  sudo mv /volume1/docker/gitlab.backup /volume1/docker/gitlab
  sudo mv /volume1/docker/gitlab-db.backup /volume1/docker/gitlab-db
# Now install the synology-gitlab-jboxberger (same version as installed prevously).
#   Check "Use existing data"!
#   Use the same database passowrd you have used on the prevous installation!

# 6.2 Yay it works!!! I've backed everything up in case i miss something later! Now Cleanup.
  sudo rm -rf /volume1/docker/gitlab-backup
  sudo rm -rf /volume1/docker/gitlab.backup
  sudo rm -rf /volume1/docker/gitlab-db.backup

###################################################################################################################
If shit hits the fan! Call 911 or write me an email. I try to help as good i can.

from old modified synology-gitlab package

Prev. Version	New Version	Status
10.1.4	11.0.4-0053	modification needed*
10.1.4	11.5.1-0053	modification needed*
10.1.4	11.5.3-0053	modification needed*
---------------	-------------	----------------------
10.2.5	11.0.4-0053	modification needed*
10.2.5	11.5.1-0053	modification needed*
10.2.5	11.5.3-0053	modification needed*

# *modification - we need to restore the naming scheme from the stock package BEFORE the update

sudo vi /var/packages/Docker-GitLab/INFO
change the line: version="10.x.x" to version="10.x.x-0050"

sudo vi /var/packages/Docker-GitLab/etc/config
change the line: VERSION="10.x.x" to VERSION="0050"

from maria_db to postgres_sql

This is the snippet how the synology-gitlab original package converts from mariadb to postgres, just in case you need it otherwise. You find the db_converter.py in the .spk file, just extract it like a zip file and watch for the scripts folder.

#!/bin/sh
MYSQLDUMP_BIN="/usr/local/mariadb10/bin/mysqldump"
DOCKER_HOST=$(ip address show docker0 | grep inet | awk '{print $2}' | cut -f1 -d/ | head -n 1)
DB_USER="gitlab_user"
DB_PASS="<database_password>"
DB_NAME="gitlab"
MYSQL_TMP="/tmp/mysql_tmp.sql"
POSTGRESQL_TMP="/tmp/postgresql_tmp.sql"
PREUPGRADE_CHECK_DB_CONVERT="/var/packages/Docker-GitLab/scripts/preupgrade_check_db_convert/"
POSTGRESQL_NAME=synology_gitlab_postgresql

"$MYSQLDUMP_BIN" --compatible=postgresql --default-character-set=utf8 --hex-blob --host="$host" -u "$DB_USER" --password="$DB_PASS" "$DB_NAME" > "$MYSQL_TMP"
/bin/python "$PREUPGRADE_CHECK_DB_CONVERT/db_converter.py" "$MYSQL_TMP" "$POSTGRESQL_TMP"
if [ "$?" -ne 0 ]; then
	logger -p 0 "$PKG_NAME: preupgrade fail to convert db."
	exit 1
fi
docker cp "$POSTGRESQL_TMP" "$POSTGRESQL_NAME":/gitlab.psql
rm "$MYSQL_TMP" "$POSTGRESQL_TMP"

docker stop synology_gitlab
docker exec "$POSTGRESQL_NAME" psql -U "postgres" -c "DROP DATABASE IF EXISTS $DB_NAME;"
docker exec "$POSTGRESQL_NAME" psql -U "postgres" -c "CREATE DATABASE $DB_NAME;"
docker exec "$POSTGRESQL_NAME" psql -U "postgres" -c "GRANT ALL privileges ON DATABASE $DB_NAME TO $DB_USER;"
docker exec "$POSTGRESQL_NAME" psql -U "$DB_USER" -v "ON_ERROR_STOP=1" -f /gitlab.psql -d "$DB_NAME"
docker start synology_gitlab