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;;; docker-tramp-compat.el --- TRAMP integration for docker containers -*- lexical-binding: t; -*-
;; Copyright (C) 2015 Mario Rodas <marsam@users.noreply.github.com>
;; Author: Mario Rodas <marsam@users.noreply.github.com>
;; URL: https://github.com/emacs-pe/docker-tramp.el
;; Keywords: docker, convenience
;; Version: 0.1
;; Package-Requires: ((emacs "24"))
;; This file is NOT part of GNU Emacs.
;;; License:
;; This program 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.
;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(require 'tramp-sh)
(when (version< tramp-version "2.3")
;; Overwrite `tramp-wait-for-output' to work with Alpine busy boxes in Tramp<2.3
;;
;; See:
;; + https://lists.gnu.org/archive/html/tramp-devel/2016-05/msg00000.html
;; + http://git.savannah.gnu.org/cgit/tramp.git/commit/?id=98a511248a9405848ed44de48a565b0b725af82c
(defconst tramp-device-escape-sequence-regexp "\e[[0-9]+n"
"Terminal control escape sequences for device status.")
(defun tramp-wait-for-output (proc &optional timeout)
"Wait for output from remote command."
(unless (buffer-live-p (process-buffer proc))
(delete-process proc)
(tramp-error proc 'file-error "Process `%s' not available, try again" proc))
(with-current-buffer (process-buffer proc)
(let* (;; Initially, `tramp-end-of-output' is "#$ ". There might
;; be leading escape sequences, which must be ignored.
;; Busyboxes built with the EDITING_ASK_TERMINAL config
;; option send also escape sequences, which must be
;; ignored.
(regexp (format "[^#$\n]*%s\\(%s\\)?\r?$"
(regexp-quote tramp-end-of-output)
tramp-device-escape-sequence-regexp))
;; Sometimes, the commands do not return a newline but a
;; null byte before the shell prompt, for example "git
;; ls-files -c -z ...".
(regexp1 (format "\\(^\\|\000\\)%s" regexp))
(found (tramp-wait-for-regexp proc timeout regexp1)))
(if found
(let (buffer-read-only)
;; A simple-minded busybox has sent " ^H" sequences.
;; Delete them.
(goto-char (point-min))
(when (re-search-forward "^\\(.\b\\)+$" (point-at-eol) t)
(forward-line 1)
(delete-region (point-min) (point)))
;; Delete the prompt.
(goto-char (point-max))
(re-search-backward regexp nil t)
(delete-region (point) (point-max)))
(if timeout
(tramp-error
proc 'file-error
"[[Remote prompt `%s' not found in %d secs]]"
tramp-end-of-output timeout)
(tramp-error
proc 'file-error
"[[Remote prompt `%s' not found]]" tramp-end-of-output)))
;; Return value is whether end-of-output sentinel was found.
found)))
)
(provide 'docker-tramp-compat)
;;; docker-tramp-compat.el ends here
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