tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

machined: when opening a shell via machined, pass tty fds in With this change we'll open the shell's tty right from machined and then pass it to the transient unit we create. This way we make sure the pty is opened exactly as long as the transient service is around, and no longer, and vice versa. This way pty forwarders do not have to deal with EIO problems due to vhangup, as the pty is open all the time from the point we set things up to the point where the service goes away.

machined: introduce pseudo-machine ".host" refererring to the host system Some of the operations machined/machinectl implement are also very useful when applied to the host system (such as machinectl login, machinectl shell or machinectl status), hence introduce a pseudo-machine by the name of ".host" in machined that refers to the host system, and may be used top execute operations on the host system with. This copies the pseudo-image ".host" machined already implements for image related commands. (This commit also adds a PK privilege for opening a PTY in a container, which was previously not accessible for non-root.)

machined: rework state tracking logic for machines This splits up the stopping logic for machines into two steps: first on machine_stop() we begin with the shutdown of a machine by queuing the stop method call for it. Then, in machine_finalize() we actually remove the rest of its runtime context. This mimics closely how sessions are handled in logind. This also reworks the GC logic to strictly check the current state of the machine unit, rather than shortcutting a few cases, like for example assuming that UnitRemoved really means a machine is gone (which it isn't since Reloading might trigger it, see #376). Fixes #376.

machine: drop state variable from Machine object We never made use of it, let's get rid of it.

machined: make sure to track machine unit states properly If a unit is stopped for a moment, we need to invalidate our knowledge of it, otherwise we might be confused by automatic restarts This makes reboots for nspawn containers run as service work correctly. https://bugs.freedesktop.org/show_bug.cgi?id=87428

remove unused includes This patch removes includes that are not used. The removals were found with include-what-you-use which checks if any of the symbols from a header is in use.

machined: make "machinectl copy-to" and "machinectl copy-from" server side operations This way, any bus client can make use of these calls.

Revert "machined: don't force terminate registered machines" This reverts commit 206e7a5f7b55ac61188efd895e65ab26e478cbb2. We actually want to allow shutting down containers that use RegisterMachine() rather than CreateMachine() to register their own unit. It should be safe to do so, since the primary usecase for RegisterMachine() are container managers that run only a single container within their own unit, such as systemd-nspawn.

machined: Move image discovery logic into src/shared, so that we can make use of it from nspawn

machined: add new call OpenMachineLogin() that starts a getty in a container on a pty and returns the pty master fd to the client This is a one-stop solution for "machinectl login", and should simplify getting logins in containers.

machined: add OpenMachinePTY() bus call for allocating a PTY device within a container Then, port "machinectl" over to make use of it.

machined: allow registering host-side network interfaces for communication with containers

machinectl: show /etc/os-release information of container in status output

machined: don't force terminate registered machines When a machine is registered in machined with CreateMachine it is OK to kill the machine when it is terminated, but when an existing unit is simply registered via RegisterMachine we shouldn't do that, as the unit is controlled by somebody else.

machined: add logic to query IP addresses of containers

machined: optionally, allow registration of pre-existing units (scopes or services) as machine with machined

bus: also add error parameter to object find and enumerator callbacks Just in order to bring things inline with the method and property callbacks.

machined: simplifications

machined: port over to libsystemd-bus

machined: forward scope properties array from client to systemd This makes nspawn's --scope= switch work again.

machined: split out machine registration stuff from logind Embedded folks don't need the machine registration stuff, hence it's nice to make this optional. Also, I'd expect that machinectl will grow additional commands quickly, for example to join existing containers and suchlike, hence it's better keeping that separate from loginctl.