To allow emacsclient running on Phobos to communication with Emacs back on Earth, socket created by the edit server needs to be forwarded. ![]() Naming things is the most difficult things in software engineering, but let’s try and settle on the local machine being earth.local while the remote one being. Rather than talking abstractly about local and remote hosts, it might be more fun to pick some names for machines in question. Solution described herein is therefore not recommended unless administrator of the remote host is trusted. However, just like with X and agent forwarding, remote socket forwarding gives remote host’s administrator access to local socket which can be exploited to run arbitrary code on local host. Normally this is not an issue since only the user running the server is able to connect to it. This means that whoever connects to the editor can execute arbitrary code with privileges of the user Emacs runs under. The edit server protocol allows for Elisp forms to be sent for evaluation. Security implicationsīefore going further, there’s an important security consideration. Depending on particular system, commands and configuration described further down may need adjustments to match where the server’s socket is actually located. To keep things simple, this article assumes values as listed in the table above. Note that where exactly the socket ends up may vary. Variable Expected value server-use-tcp nil server-socket-dir " /run/user/ /emacs" server-name " server" Their values can be inspected by typing C-h v variable-name RET (which runs describe-variable command). The former is the case if server-use-tcp is nil the later is indicated by server-socket-dir and server-name variables. There are other ways to start a server but whichever method one picks, the important points are to i) make sure TCP is not used and ii) note where the UNIX-domain socket is created. If the server is working correctly, executing emacsclient -e emacs-version in a terminal should result in Emacs version being printed. The simplest way to start a server is by calling start-server command inside of Emacs by typing M-x server-start RET. Its most obvious benefit is opening files in an existing Emacs instance rather than having to launch a new copy each time. Edit server is a feature of Emacs which allows the editor to be controlled by a separate process, namely emacsclient. Starting Emacs serverįirst step is to get edit server running. Herein I will describe how to accomplish that. And besides, having multiple Emacs instance running (one local and one remote) is not the way.įortunately, by utilising SSH remote forwarding, Emacs can be configured to edit remote files and accept server commands from within an SSH session. X forwarding is another option but gets sluggish over high-latency connections. ![]() Running Emacs in a terminal is of course possible, but graphical interface provides minor benefits which I like to keep. ![]() emacsclient filename works locally but gets a bit tricky over SSH. Since more often than not I open files from shell rather than from within my editor, this in particular means having the same command opening files in Emacs available on all computers. ![]() In those situations, I like to have things work the same way regardless of which host I’m on. I often develop software on remote machines logged in via SSH to a workstation where all source code reside.
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