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;;; tramp-docker.el --- Tramp integration for Docker containers -*- lexical-binding: t; -*-
;; Copyright © 2022 Free Software Foundation, Inc.
;; Author: Brian Cully <bjc@kublai.com>
;; Keywords: comm, processes
;; Package: tramp
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; ‘tramp-docker’ allows Tramp access to environments provided by
;; Docker.
;;
;; ## Usage
;;
;; Open a file on a running systemd-docker container:
;;
;; C-x C-f /docker:USER@CONTAINER:/path/to/file
;;
;; Where:
;; USER is the user on the container to connect as (optional)
;; CONTAINER is the container to connect to
;;; Code:
(require 'tramp)
;;;###tramp-autoload
(defcustom tramp-docker-program "docker"
"Name of the Docker client program."
:group 'tramp
:version "29.1"
:type '(choice (const "docker")
(const "podman")
(string)))
;;;###tramp-autoload
(defconst tramp-docker-method "docker"
"Tramp method name to use to connect to Docker containers.")
;;;###tramp-autoload
(defun tramp-docker--completion-function (&rest _args)
"List Docker containers available for connection.
This function is used by `tramp-set-completion-function', please
see its function help for a description of the format."
(when-let ((raw-list (shell-command-to-string
(concat tramp-docker-program
" ps --format '{{.ID}}\t{{.Names}}'")))
(lines (split-string raw-list "\n" 'omit))
(names (mapcar
(lambda (line)
(when (string-match
(rx bol (group (1+ nonl))
"\t" (? (group (1+ nonl))) eol)
line)
(or (match-string 2 line) (match-string 1 line))))
lines)))
(mapcar (lambda (m) (list nil m)) (delq nil names))))
;;;###tramp-autoload
(tramp--with-startup
(push `(,tramp-docker-method
(tramp-login-program ,tramp-docker-program)
(tramp-login-args (("exec")
("-it")
("-u" "%u")
("%h")
("%l")))
(tramp-remote-shell ,tramp-default-remote-shell)
(tramp-remote-shell-login ("-l"))
(tramp-remote-shell-args ("-i" "-c")))
tramp-methods)
(tramp-set-completion-function
tramp-docker-method
'((tramp-docker--completion-function ""))))
(add-hook 'tramp-unload-hook
(lambda ()
(unload-feature 'tramp-docker 'force)))
(provide 'tramp-docker)
;;; tramp-docker.el ends here
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