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;;; tramp-fuse.el --- Tramp access functions for FUSE mounts -*- lexical-binding:t -*-
;; Copyright (C) 2021 Free Software Foundation, Inc.
;; Author: Michael Albinus <michael.albinus@gmx.de>
;; 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:
;; These are helper functions for FUSE file systems.
;;; Code:
(require 'tramp)
;; File name primitives.
(defun tramp-fuse-handle-delete-directory
(directory &optional recursive trash)
"Like `delete-directory' for Tramp files."
(with-parsed-tramp-file-name (expand-file-name directory) nil
(tramp-flush-directory-properties v localname)
(delete-directory (tramp-fuse-local-file-name directory) recursive trash)))
(defun tramp-fuse-handle-delete-file (filename &optional trash)
"Like `delete-file' for Tramp files."
(with-parsed-tramp-file-name (expand-file-name filename) nil
(delete-file (tramp-fuse-local-file-name filename) trash)
(tramp-flush-file-properties v localname)))
(defun tramp-fuse-handle-directory-files
(directory &optional full match nosort count)
"Like `directory-files' for Tramp files."
(unless (file-exists-p directory)
(tramp-compat-file-missing (tramp-dissect-file-name directory) directory))
(when (file-directory-p directory)
(setq directory (file-name-as-directory (expand-file-name directory)))
(with-parsed-tramp-file-name directory nil
(let ((result
(tramp-compat-directory-files
(tramp-fuse-local-file-name directory) full match nosort count)))
;; Massage the result.
(when full
(let ((local (concat "^" (regexp-quote (tramp-fuse-mount-point v))))
(remote (directory-file-name
(funcall
(if (tramp-compat-file-name-quoted-p directory)
#'tramp-compat-file-name-quote #'identity)
(file-remote-p directory)))))
(setq result
(mapcar
(lambda (x) (replace-regexp-in-string local remote x))
result))))
;; Some storage systems do not return "." and "..".
(dolist (item '(".." "."))
(when (and (string-match-p (or match (regexp-quote item)) item)
(not
(member (if full (setq item (concat directory item)) item)
result)))
(setq result (cons item result))))
;; Return result.
(if nosort result (sort result #'string<))))))
(defun tramp-fuse-handle-file-attributes (filename &optional id-format)
"Like `file-attributes' for Tramp files."
(with-parsed-tramp-file-name (expand-file-name filename) nil
(with-tramp-file-property
v localname (format "file-attributes-%s" id-format)
(file-attributes (tramp-fuse-local-file-name filename) id-format))))
(defun tramp-fuse-handle-file-executable-p (filename)
"Like `file-executable-p' for Tramp files."
(with-parsed-tramp-file-name (expand-file-name filename) nil
(with-tramp-file-property v localname "file-executable-p"
(file-executable-p (tramp-fuse-local-file-name filename)))))
(defun tramp-fuse-handle-file-name-all-completions (filename directory)
"Like `file-name-all-completions' for Tramp files."
(all-completions
filename
(delete-dups
(append
(file-name-all-completions
filename (tramp-fuse-local-file-name directory))
;; Some storage systems do not return "." and "..".
(let (result)
(dolist (item '(".." ".") result)
(when (string-prefix-p filename item)
(catch 'match
(dolist (elt completion-regexp-list)
(unless (string-match-p elt item) (throw 'match nil)))
(setq result (cons (concat item "/") result))))))))))
(defun tramp-fuse-handle-file-readable-p (filename)
"Like `file-readable-p' for Tramp files."
(with-parsed-tramp-file-name (expand-file-name filename) nil
(with-tramp-file-property v localname "file-readable-p"
(file-readable-p (tramp-fuse-local-file-name filename)))))
;; This function isn't used.
(defun tramp-fuse-handle-insert-directory
(filename switches &optional wildcard full-directory-p)
"Like `insert-directory' for Tramp files."
(insert-directory
(tramp-fuse-local-file-name filename) switches wildcard full-directory-p)
(goto-char (point-min))
(while (search-forward (tramp-fuse-local-file-name filename) nil 'noerror)
(replace-match filename)))
(defun tramp-fuse-handle-make-directory (dir &optional parents)
"Like `make-directory' for Tramp files."
(with-parsed-tramp-file-name (expand-file-name dir) nil
(make-directory (tramp-fuse-local-file-name dir) parents)
;; When PARENTS is non-nil, DIR could be a chain of non-existent
;; directories a/b/c/... Instead of checking, we simply flush the
;; whole file cache.
(tramp-flush-file-properties v localname)
(tramp-flush-directory-properties
v (if parents "/" (file-name-directory localname)))))
;; File name helper functions.
(defun tramp-fuse-mount-spec (vec)
"Return local mount spec of VEC."
(if-let ((host (tramp-file-name-host vec))
(user (tramp-file-name-user vec)))
(format "%s@%s:/" user host)
(format "%s:/" host)))
(defun tramp-fuse-mount-point (vec)
"Return local mount point of VEC."
(or (tramp-get-connection-property vec "mount-point" nil)
(expand-file-name
(concat
tramp-temp-name-prefix
(tramp-file-name-method vec) "."
(when (tramp-file-name-user vec)
(concat (tramp-file-name-user-domain vec) "@"))
(tramp-file-name-host-port vec))
(tramp-compat-temporary-file-directory))))
(defun tramp-fuse-mounted-p (vec)
"Check, whether fuse volume determined by VEC is mounted."
(when (tramp-get-connection-process vec)
;; We cannot use `with-connection-property', because we don't want
;; to cache a nil result.
(or (tramp-get-connection-property
(tramp-get-connection-process vec) "mounted" nil)
(let* ((default-directory (tramp-compat-temporary-file-directory))
(command (format "mount -t fuse.%s" (tramp-file-name-method vec)))
(mount (shell-command-to-string command)))
(tramp-message vec 6 "%s\n%s" command mount)
(tramp-set-connection-property
(tramp-get-connection-process vec) "mounted"
(when (string-match
(format
"^\\(%s\\)\\s-" (regexp-quote (tramp-fuse-mount-spec vec)))
mount)
(match-string 1 mount)))))))
(defun tramp-fuse-unmount (vec)
"Unmount fuse volume determined by VEC."
(let ((default-directory (tramp-compat-temporary-file-directory))
(command (format "fusermount3 -u %s" (tramp-fuse-mount-point vec))))
(tramp-message vec 6 "%s\n%s" command (shell-command-to-string command))
(tramp-flush-connection-property
(tramp-get-connection-process vec) "mounted")
;; Give the caches a chance to expire.
(sleep-for 1)))
(defun tramp-fuse-local-file-name (filename)
"Return local mount name of FILENAME."
(setq filename (tramp-compat-file-name-unquote (expand-file-name filename)))
(with-parsed-tramp-file-name filename nil
;; As long as we call `tramp-*-maybe-open-connection' here,
;; we cache the result.
(with-tramp-file-property v localname "local-file-name"
(funcall
(intern
(format "tramp-%s-maybe-open-connection" (tramp-file-name-method v)))
v)
(let ((quoted (tramp-compat-file-name-quoted-p localname))
(localname (tramp-compat-file-name-unquote localname)))
(funcall
(if quoted #'tramp-compat-file-name-quote #'identity)
(expand-file-name
(if (file-name-absolute-p localname)
(substring localname 1) localname)
(tramp-fuse-mount-point v)))))))
(add-hook 'tramp-unload-hook
(lambda ()
(unload-feature 'tramp-fuse 'force)))
(provide 'tramp-fuse)
;;; tramp-fuse.el ends here
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