Implements executing the init system

[mildred]

Add the toolbox recreate sub command

The recreate command is saving the current container as a new image, removing the container, and recreating a new container with all the updated options.

Implements debarshiray/toolbox#143

Allow to run systemd within the container

debarshiray/toolbox#176

Add an --init option to create or recreate a container with a split PID namespace. In such circumstances, the /sbin/init is executed instead of sleep. Toolbox shells are then able to access systemd using systemctl.

[mildred]

Updated the PR to make this dependent upon the --init command-line option

[ibotty]

Any updates? Is that a viable approach? Would that possibly get merged if the conflicts get resolved?

[mildred]

Just updated this PR on top of latest master, and removed the recreate command to simplify this PR.

I'm using this feature and it works well.

[mildred]

I'm using containers created by this PR daily and it works really great.

[mjburling]

Perhaps the use-case for running an RDBMs is too high-minded. From toolbox, I just don't want to have to run:

1. emacs --daemon=foo
2. emacsclient --socket-name=foo --create-frame &

This seems to be able to satisfy the systemd requirements... What's holding up the merge?

[mildred]

Just rebased my branch to latest master. If someone can take a look at it, I would be grateful. The change is really light (just replace the sleep by init and change just a few container options : unshare pid namespace, host dbus and mount /run as tmpfs)

[mildred]

Sorry, this is no longer working with the newer version. And having journald mounted from within the container does not work.

[bam80]

Progress?