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c5d6102313
* doc/misc/tramp.texi (Inline methods): Shorten kubernetes entry. (Kubernetes setup): New node. (Top, Configuration): Add it to the menu. * lisp/net/tramp-container.el (tramp-kubernetes--context-namespace): Adapt dpcstring. (tramp-kubernetes-connection-local-default-profile) (tramp-kubernetes-connection-local-default-variables) (tramp-flatpak-connection-local-default-profile) (tramp-flatpak-connection-local-default-variables): Rename. * lisp/net/tramp.el (tramp-expand-args): Use `tramp-compat-take'. * test/lisp/net/tramp-tests.el (tramp-test34-connection-local-variables) (tramp-test34-explicit-shell-file-name): Don't let-bind `connection-local-profile-alist' and `connection-local-criteria-alist'.
442 lines
15 KiB
EmacsLisp
442 lines
15 KiB
EmacsLisp
;;; tramp-container.el --- Tramp integration for Docker-like containers -*- lexical-binding: t; -*-
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;; Copyright © 2022-2023 Free Software Foundation, Inc.
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;; Author: Brian Cully <bjc@kublai.com>
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;; Keywords: comm, processes
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;; Package: tramp
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Allows Tramp access to environments provided by Docker and similar
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;; programs.
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;;
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;; ## Usage
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;;
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;; Open a file on a running Docker container:
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;;
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;; C-x C-f /docker:USER@CONTAINER:/path/to/file
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;;
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;; or Podman:
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;;
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;; C-x C-f /podman:USER@CONTAINER:/path/to/file
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;;
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;; Where:
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;; USER is the user on the container to connect as (optional).
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;; CONTAINER is the container to connect to.
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;;
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;;
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;;
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;; Open file in a Kubernetes container:
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;;
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;; C-x C-f /kubernetes:[CONTAINER.]POD:/path/to/file
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;;
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;; Where:
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;; POD is the pod to connect to.
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;; CONTAINER is the container to connect to (optional).
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;; By default, the first container in that pod will
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;; be used.
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;;
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;; Completion for POD and accessing it operate in the current
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;; namespace, use this command to change it:
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;;
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;; "kubectl config set-context --current --namespace=<name>"
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;;
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;;
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;;
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;; Open a file on an existing Toolbox container:
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;;
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;; C-x C-f /toolbox:CONTAINER:/path/to/file
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;;
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;; Where:
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;; CONTAINER is the container to connect to (optional).
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;;
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;; If the container is not running, it is started. If no container is
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;; specified, the default Toolbox container is used.
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;;
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;;
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;;
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;; Open a file on a running Flatpak sandbox:
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;;
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;; C-x C-f /flatpak:SANDBOX:/path/to/file
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;;
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;; Where:
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;; SANDBOX is the running sandbox to connect to.
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;; It could be an application ID, an instance ID, or a PID.
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;;; Code:
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(require 'tramp)
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;;;###tramp-autoload
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(defcustom tramp-docker-program "docker"
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"Name of the Docker client program."
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:group 'tramp
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:version "29.1"
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:type '(choice (const "docker")
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(string)))
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;;;###tramp-autoload
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(defcustom tramp-podman-program "podman"
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"Name of the Podman client program."
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:group 'tramp
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:version "29.1"
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:type '(choice (const "podman")
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(string)))
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;;;###tramp-autoload
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(defcustom tramp-kubernetes-program "kubectl"
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"Name of the Kubernetes client program."
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:group 'tramp
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:version "29.1"
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:type '(choice (const "kubectl")
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(string)))
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(defcustom tramp-kubernetes-context nil
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"Context of Kubernetes.
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If it is nil, the default context will be used."
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:group 'tramp
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:version "30.1"
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:type '(choice (const :tag "Use default" nil)
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(string)))
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(defcustom tramp-kubernetes-namespace "default"
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"Namespace of Kubernetes."
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:group 'tramp
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:version "30.1"
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:type 'string)
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;;;###tramp-autoload
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(defcustom tramp-toolbox-program "toolbox"
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"Name of the Toolbox client program."
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:group 'tramp
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:version "30.1"
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:type '(choice (const "toolbox")
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(string)))
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;;;###tramp-autoload
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(defcustom tramp-flatpak-program "flatpak"
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"Name of the Flatpak client program."
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:group 'tramp
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:version "30.1"
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:type '(choice (const "flatpak")
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(string)))
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;;;###tramp-autoload
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(defconst tramp-docker-method "docker"
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"Tramp method name to use to connect to Docker containers.")
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;;;###tramp-autoload
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(defconst tramp-podman-method "podman"
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"Tramp method name to use to connect to Podman containers.")
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;;;###tramp-autoload
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(defconst tramp-kubernetes-method "kubernetes"
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"Tramp method name to use to connect to Kubernetes containers.")
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;;;###tramp-autoload
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(defconst tramp-toolbox-method "toolbox"
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"Tramp method name to use to connect to Toolbox containers.")
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;;;###tramp-autoload
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(defconst tramp-flatpak-method "flatpak"
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"Tramp method name to use to connect to Flatpak sandboxes.")
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;;;###tramp-autoload
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(defun tramp-container--completion-function (program)
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"List running containers available for connection.
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PROGRAM is the program to be run for \"ps\", either
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`tramp-docker-program' or `tramp-podman-program'.
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This function is used by `tramp-set-completion-function', please
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see its function help for a description of the format."
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(when-let ((default-directory tramp-compat-temporary-file-directory)
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(raw-list (shell-command-to-string
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(concat program " ps --format '{{.ID}}\t{{.Names}}'")))
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(lines (split-string raw-list "\n" 'omit))
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(names (mapcar
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(lambda (line)
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(when (string-match
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(rx bol (group (1+ nonl))
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"\t" (? (group (1+ nonl))) eol)
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line)
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(or (match-string 2 line) (match-string 1 line))))
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lines)))
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(mapcar (lambda (name) (list nil name)) (delq nil names))))
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;;;###tramp-autoload
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(defun tramp-kubernetes--completion-function (&rest _args)
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"List Kubernetes pods available for connection.
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This function is used by `tramp-set-completion-function', please
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see its function help for a description of the format."
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(when-let ((default-directory tramp-compat-temporary-file-directory)
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(raw-list (shell-command-to-string
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(concat
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tramp-kubernetes-program " "
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(tramp-kubernetes--context-namespace nil)
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" get pods --no-headers"
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;; We separate pods by "|". Inside a pod,
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;; its name is separated from the containers
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;; by ":". Containers are separated by ",".
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" -o jsonpath='{range .items[*]}{\"|\"}{.metadata.name}"
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"{\":\"}{range .spec.containers[*]}{.name}{\",\"}"
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"{end}{end}'")))
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(lines (split-string raw-list "|" 'omit)))
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(let (names)
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(dolist (line lines)
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(setq line (split-string line ":" 'omit))
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;; Pod name.
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(push (car line) names)
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;; Container names.
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(dolist (elt (split-string (cadr line) "," 'omit))
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(push (concat elt "." (car line)) names)))
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(mapcar (lambda (name) (list nil name)) (delq nil names)))))
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(defconst tramp-kubernetes--host-name-regexp
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(rx (? (group (regexp tramp-host-regexp)) ".")
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(group (regexp tramp-host-regexp)))
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"The CONTAINER.POD syntax of kubernetes host names in Tramp.")
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;;;###tramp-autoload
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(defun tramp-kubernetes--container (vec)
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"Extract the container name from a kubernetes host name in VEC."
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(or (let ((host (tramp-file-name-host vec)))
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(and (string-match tramp-kubernetes--host-name-regexp host)
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(match-string 1 host)))
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""))
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;;;###tramp-autoload
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(defun tramp-kubernetes--pod (vec)
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"Extract the pod name from a kubernetes host name in VEC."
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(or (let ((host (tramp-file-name-host vec)))
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(and (string-match tramp-kubernetes--host-name-regexp host)
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(match-string 2 host)))
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""))
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(defun tramp-kubernetes--current-context (vec)
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"Return Kubernetes current context.
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Obey `tramp-kubernetes-context'"
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(or tramp-kubernetes-context
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(with-tramp-connection-property nil "current-context"
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(with-temp-buffer
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(when (zerop
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(tramp-call-process
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vec tramp-kubernetes-program nil t nil
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"config" "current-context"))
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(goto-char (point-min))
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(buffer-substring (point) (line-end-position)))))))
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(defun tramp-kubernetes--current-context-data (vec)
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"Return Kubernetes current context data as JSON string."
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(when-let ((current-context (tramp-kubernetes--current-context vec)))
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(with-temp-buffer
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(when (zerop
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(tramp-call-process
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vec tramp-kubernetes-program nil t nil
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"config" "view" "-o"
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(format
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"jsonpath='{.contexts[?(@.name == \"%s\")]}'" current-context)))
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(buffer-string)))))
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;;;###tramp-autoload
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(defun tramp-kubernetes--context-namespace (vec)
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"The kubectl options for context and namespace as string."
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(mapconcat
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#'identity
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`(,(when-let ((context (tramp-kubernetes--current-context vec)))
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(format "--context=%s" context))
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,(when tramp-kubernetes-namespace
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(format "--namespace=%s" tramp-kubernetes-namespace)))
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" "))
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;;;###tramp-autoload
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(defun tramp-toolbox--completion-function (&rest _args)
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"List Toolbox containers available for connection.
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This function is used by `tramp-set-completion-function', please
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see its function help for a description of the format."
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(when-let ((default-directory tramp-compat-temporary-file-directory)
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(raw-list (shell-command-to-string
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(concat tramp-toolbox-program " list -c")))
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;; Ignore header line.
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(lines (cdr (split-string raw-list "\n" 'omit)))
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(names (mapcar
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(lambda (line)
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(when (string-match
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(rx bol (1+ (not space))
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(1+ space) (group (1+ (not space))) space)
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line)
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(match-string 1 line)))
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lines)))
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(mapcar (lambda (name) (list nil name)) (delq nil names))))
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;;;###tramp-autoload
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(defun tramp-flatpak--completion-function (&rest _args)
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"List Flatpak sandboxes available for connection.
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It returns application IDs or, in case there is no application
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ID, instance IDs.
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This function is used by `tramp-set-completion-function', please
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see its function help for a description of the format."
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(when-let ((default-directory tramp-compat-temporary-file-directory)
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(raw-list
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(shell-command-to-string
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(concat tramp-flatpak-program
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" ps --columns=instance,application")))
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(lines (split-string raw-list "\n" 'omit))
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(names (mapcar
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(lambda (line)
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(when (string-match
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(rx bol (* space) (group (+ (not space)))
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(? (+ space) (group (+ (not space)))) eol)
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line)
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(or (match-string 2 line) (match-string 1 line))))
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lines)))
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(mapcar (lambda (name) (list nil name)) (delq nil names))))
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;;;###tramp-autoload
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(defvar tramp-default-remote-shell) ;; Silence byte compiler.
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;;;###tramp-autoload
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(tramp--with-startup
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(add-to-list 'tramp-methods
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`(,tramp-docker-method
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(tramp-login-program ,tramp-docker-program)
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(tramp-login-args (("exec")
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("-it")
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("-u" "%u")
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("%h")
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("%l")))
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(tramp-direct-async (,tramp-default-remote-shell "-c"))
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(tramp-remote-shell ,tramp-default-remote-shell)
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(tramp-remote-shell-login ("-l"))
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(tramp-remote-shell-args ("-i" "-c"))))
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(add-to-list 'tramp-methods
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`(,tramp-podman-method
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(tramp-login-program ,tramp-podman-program)
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(tramp-login-args (("exec")
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("-it")
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("-u" "%u")
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("%h")
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("%l")))
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(tramp-direct-async (,tramp-default-remote-shell "-c"))
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(tramp-remote-shell ,tramp-default-remote-shell)
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(tramp-remote-shell-login ("-l"))
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(tramp-remote-shell-args ("-i" "-c"))))
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(add-to-list 'tramp-methods
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`(,tramp-kubernetes-method
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(tramp-login-program ,tramp-kubernetes-program)
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(tramp-login-args (("%x") ; context and namespace.
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("exec")
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("-c" "%a") ; container.
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("%h")
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("-it")
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("--")
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("%l")))
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(tramp-direct-async (,tramp-default-remote-shell "-c"))
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(tramp-remote-shell ,tramp-default-remote-shell)
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(tramp-remote-shell-login ("-l"))
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(tramp-remote-shell-args ("-i" "-c"))))
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(add-to-list 'tramp-methods
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`(,tramp-toolbox-method
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(tramp-login-program ,tramp-toolbox-program)
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(tramp-login-args (("run")
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("-c" "%h")
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("%l")))
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(tramp-direct-async (,tramp-default-remote-shell "-c"))
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(tramp-remote-shell ,tramp-default-remote-shell)
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(tramp-remote-shell-login ("-l"))
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(tramp-remote-shell-args ("-c"))))
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(add-to-list 'tramp-default-host-alist `(,tramp-toolbox-method nil ""))
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(add-to-list 'tramp-methods
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`(,tramp-flatpak-method
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(tramp-login-program ,tramp-flatpak-program)
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(tramp-login-args (("enter")
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("%h")
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("%l")))
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(tramp-direct-async (,tramp-default-remote-shell "-c"))
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(tramp-remote-shell ,tramp-default-remote-shell)
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(tramp-remote-shell-login ("-l"))
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(tramp-remote-shell-args ("-c"))))
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(tramp-set-completion-function
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tramp-docker-method
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`((tramp-container--completion-function
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,(executable-find tramp-docker-program))))
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(tramp-set-completion-function
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tramp-podman-method
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`((tramp-container--completion-function
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,(executable-find tramp-podman-program))))
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(tramp-set-completion-function
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tramp-kubernetes-method
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'((tramp-kubernetes--completion-function "")))
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(tramp-set-completion-function
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tramp-toolbox-method
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'((tramp-toolbox--completion-function "")))
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(tramp-set-completion-function
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tramp-flatpak-method
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'((tramp-flatpak--completion-function "")))
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;; Default connection-local variables for Tramp.
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(defconst tramp-kubernetes-connection-local-default-variables
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'((tramp-config-check . tramp-kubernetes--current-context-data)
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;; This variable will be eval'ed in `tramp-expand-args'.
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(tramp-extra-expand-args
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. (?a (tramp-kubernetes--container (car tramp-current-connection))
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?h (tramp-kubernetes--pod (car tramp-current-connection))
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?x (tramp-kubernetes--context-namespace (car tramp-current-connection)))))
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"Default connection-local variables for remote kubernetes connections.")
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(connection-local-set-profile-variables
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'tramp-kubernetes-connection-local-default-profile
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tramp-kubernetes-connection-local-default-variables)
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(connection-local-set-profiles
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`(:application tramp :protocol ,tramp-kubernetes-method)
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'tramp-kubernetes-connection-local-default-profile)
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(defconst tramp-flatpak-connection-local-default-variables
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`((tramp-remote-path . ,(cons "/app/bin" tramp-remote-path)))
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"Default connection-local variables for remote flatpak connections.")
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(connection-local-set-profile-variables
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'tramp-flatpak-connection-local-default-profile
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tramp-flatpak-connection-local-default-variables)
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(connection-local-set-profiles
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`(:application tramp :protocol ,tramp-flatpak-method)
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'tramp-flatpak-connection-local-default-profile))
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(add-hook 'tramp-unload-hook
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(lambda ()
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(unload-feature 'tramp-container 'force)))
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(provide 'tramp-container)
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;;; tramp-container.el ends here
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