mega-cmd-server

Docker container with MegaCmd installed and configured to start mega-cmd-server for background synchronisation.

Source code is in: https://github.com/thomfab/docker-mega-cmd-server

objective

This image is aimed to be used on systems where MegaCmd is not supported (for example Truenas Scale), or to synchronize multiple accounts easily by launching several containers with different user ids.

design principles

This image launches the mega-cmd-server binary to provide continuous synchronisation of one or more local folders with your Mega account.

The objective is to be able to map a user and group id to a local ones so that files are created and modified with the correct attributes. The Docker USER directive (or parameter --user) was not chosen because the home directory of the user in the container is needed by megacmd and it cannot be created on the fly when launching the container.

Therefore, gosu is used and user and group ids are passed with environment variables (see usage paragraph).

mega-cmd-server is run with a user named user that is created if needed when starting the container. A check is done for user id collision (for example if passed id is 1000, then the default ubuntu user is deleted and a new user user is created).

possible environment variables

• PUID and PGID : used to match IDs defined on the Docker host so that UNIX rights are correct when accessing the volumes

volumes

Define one or more volumes for the folders to be synchronized on the host.

For example: --volume=/path/to/host/folder:/sync and then the /sync folder can be used in the mega-sync command to create a synchronisation task.

You can also define a volume to persist mega-cmd data: --volume=/path/to/host/folder:/home/user/.megaCmd

usage

Assuming that you have a user johndoe on your host, with a user id of 1234 and a primary group johngroup with a group id of 5678, and you want to synchronize the host folder /home/johndoe/photos with the /photos folder on your Mega account.

start container

Launch the container with the following command line:

$ docker run -d --name mega \
        -v "/home/johndoe/photos:/sync" \
        -e "PUID=1234" \
        -e "PGID=5678" \
        thomfab/mega-cmd-server

You can check that the container started with docker logs mega:

[...]
Starting with :
   user  : user
   uid   : 1234
   group : user
   gid   : 5678

.===========================================================================.
|               __  __ _____ ____    _                      _               |
|              |  \/  | ___|/ ___|  / \   ___ _ __ ___   __| |              |
|              | |\/| | \  / |  _  / _ \ / __| '_ ` _ \ / _` |              |
|              | |  | | /__\ |_| |/ ___ \ (__| | | | | | (_| |              |
|              |_|  |_|____|\____/_/   \_\___|_| |_| |_|\__,_|              |
|                                                                           |
|                                  SERVER                                   |
`===========================================================================´

login

You now need to login to your Mega account (replace your Mega email and password in the command below):

$ docker exec -it mega gosu user mega-login [email protected] yoursecretpassword

If 2FA is activated on your account, Mega will ask you to enter the OTP.

Please note: when running mega commands in the container with docker exec, always prefix them with gosu user to run them as the same user as the mega-cmd-server process. Otherwise, the command you run with create a second mega-cmd-server as root, process in which you will not be logged and which will synchronize files with id 0.

synchronize

Once logged in you can use the mega commands.

List remote folders:

$ docker exec -it mega gosu user mega-ls
documents
photos

Synchronize the photos folder:

$ docker exec -it mega gosu user mega-sync /sync /photos
Added sync: /sync to /photos

more advanced usage

synchronize multiple folders

Launch with:

$ docker run -d --name mega \
        -v "/home/johndoe/photos:/sync/photos" \
        -v "/home/johndoe/documents:/sync/documents" \
        -e "PUID=1234" \
        -e "PGID=5678" \
        thomfab/mega-cmd-server

Synchronize:

$ docker exec -it mega gosu user mega-sync /sync/documents /documents
Added sync: /sync/documents to /photos
$ docker exec -it mega gosu user mega-sync /sync/photos /photos
Added sync: /sync/photos to /photos

map the megacmd folder to keep session if container is deleted

Launch with:

$ docker run -d --name mega \
        -v "/home/johndoe/photos:/sync/photos" \
        -v "/home/johndoe/mega-session:/home/user/.megaCmd" \
        -e "PUID=1234" \
        -e "PGID=5678" \
        thomfab/mega-cmd-server