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Extend Tramp to work with Docker ... even remotely.

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Howard Abrams 2022-07-26 20:23:47 -07:00
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@ -119,6 +119,56 @@ Add my org-specific predicates, see this [[http://www.howardism.org/Technical/Em
"A list of predicates than can be applied to a globbing pattern.")
(add-to-list 'eshell-predicate-alist '(?T . (eshell-org-file-tags)))
#+end_src
* Remote Editing with Tramp
[[https://www.emacswiki.org/emacs/TrampMode][Tramp]] allows almost all Emacs features to execute on a remote system.
#+begin_src emacs-lisp
(use-package tramp
:straight (:type built-in)
:config
;; Use remote PATH on tramp (handy for eshell).
(add-to-list 'tramp-remote-path 'tramp-own-remote-path)
;; Make sure version control system doesn't slow tramp:
(setq vc-ignore-dir-regexp
(format "%s\\|%s" vc-ignore-dir-regexp tramp-file-name-regexp)))
#+end_src
Will Schenk has [[https://willschenk.com/articles/2020/tramp_tricks/][a simple extension]] to allow editing of files /inside/ a Docker container:
#+begin_src emacs-lisp
(use-package tramp
:straight (:type built-in)
:config
(push '("docker" . ((tramp-login-program "docker")
(tramp-login-args (("exec" "-it") ("%h") ("/bin/sh")))
(tramp-remote-shell "/bin/sh")
(tramp-remote-shell-args ("-i") ("-c"))))
tramp-methods)
(defadvice tramp-completion-handle-file-name-all-completions
(around dotemacs-completion-docker activate)
"(tramp-completion-handle-file-name-all-completions \"\" \"/docker:\" returns
a list of active Docker container names, followed by colons."
(if (equal (ad-get-arg 1) "/docker:")
(let* ((command "docker ps --format '{{.Names}}:'")
(dockernames-raw (shell-command-to-string command))
(dockernames (split-string dockernames-raw "\n")))
(setq ad-return-value dockernames))
ad-do-it)))
#+end_src
Keep in mind you need to /name/ your Docker session, with the =—name= option. I actually do more docker work on remote systems (as Docker seems to make my fans levitate my laptop over the desk). Granted, the =URL= is a bit lengthy, for instance:
#+begin_example
/ssh:kolla-compute1.cedev13.d501.eng.pdx.wd|sudo:kolla-compute1.cedev13.d501.eng.pdx.wd|docker:kolla_toolbox:/
#+end_example
Which means, I need to put it as a link in an org file.
*Note:* That we need to have Tramp SSH option comes from my personal [[file:~/.ssh/config][.ssh/config]] file instead of its internal cache:
#+begin_src emacs-lisp
(use-package tramp-sh
:after tramp
:straight (:type built-in)
:custom (tramp-use-ssh-controlmaster-options nil))
#+end_src
* Remote Terminals
Sure =iTerm= is nice for connecting and running commands on remote systems, however, it lacks a command line option that allows you to select and manipulate the displayed text without a mouse. This is where Emacs can shine.