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[bug#62848] [PATCH 2/2] environment: Add --remote option and emacsclient
|
From: |
Antero Mejr |
|
Subject: |
[bug#62848] [PATCH 2/2] environment: Add --remote option and emacsclient-eshell backend. |
|
Date: |
Wed, 08 Nov 2023 15:21:06 +0000 |
* guix/scripts/environment.scm (launch-environment/eshell): New procedure.
(%remote-backends): New variable.
(guix-environment*): Add logic for remote backend switching.
(%options): Add --remote and --list-remote-backends options.
(show-environment-options-help): Add help text for new options.
* guix/profiles.scm (load-profile)[getenv-proc, setenv-proc, unsetenv-proc]:
New optional keyword arguments.
(purify-environment)[unsetenv-proc]: New argument.
* guix/build/emacs-utils.scm (%emacsclient): New parameter.
(emacsclient-batch-script): New procedure.
* doc/guix.texi(Invoking guix shell): Document --remote and
--list-remote-backends options.
* tests/build-emacs-utils.scm(emacsclient-batch-script): New test.
---
doc/guix.texi | 17 ++++++++
guix/build/emacs-utils.scm | 21 +++++++++
guix/profiles.scm | 30 +++++++------
guix/scripts/environment.scm | 82 ++++++++++++++++++++++++++++++++----
tests/build-emacs-utils.scm | 12 +++++-
5 files changed, 141 insertions(+), 21 deletions(-)
diff --git a/doc/guix.texi b/doc/guix.texi
index 9f06f1c325..92a0d99db7 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -6474,6 +6474,23 @@ Invoking guix shell
@itemx -s @var{system}
Attempt to build for @var{system}---e.g., @code{i686-linux}.
+@item --remote=@var{backend}[=@var{args}]
+Create an environment over a remote connection using @var{backend},
+optionally passing @var{args} to the backend.
+
+This option causes the @option{--container} option to be ignored.
+
+When @var{backend} is @code{emacsclient-eshell}, a new eshell buffer
+with the Guix environment will be opened. An Emacs server must already
+be running, and the @code{emacsclient} program must be available. Due
+to the way @code{eshell} handles commands, the @var{command} argument,
+if specified, will run in the initial @code{eshell} environment instead
+of the Guix @code{eshell} environment.
+
+@item --list-remote-backends
+Display the @var{backend} options for @code{guix shell --remote=BACKEND}
+and exit.
+
@item --container
@itemx -C
@cindex container
diff --git a/guix/build/emacs-utils.scm b/guix/build/emacs-utils.scm
index 8e12b5b6d4..e56e230efb 100644
--- a/guix/build/emacs-utils.scm
+++ b/guix/build/emacs-utils.scm
@@ -28,10 +28,12 @@ (define-module (guix build emacs-utils)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:export (%emacs
+ %emacsclient
emacs-batch-eval
emacs-batch-edit-file
emacs-batch-disable-compilation
emacs-batch-script
+ emacsclient-batch-script
emacs-batch-error?
emacs-batch-error-message
@@ -57,6 +59,10 @@ (define %emacs
;; The `emacs' command.
(make-parameter "emacs"))
+(define %emacsclient
+ ;; A list starting with the `emacsclient' command, plus optional arguments.
+ (make-parameter '("emacsclient")))
+
(define (expr->string expr)
"Converts EXPR, an expression, into a string."
(if (string? expr)
@@ -107,6 +113,21 @@ (define (emacs-batch-script expr)
(message (read-string (car error-pipe)))))))
output))
+(define (emacsclient-batch-script expr)
+ "Send the Elisp code EXPR to Emacs via emacsclient and return output."
+ (let* ((error-pipe (pipe))
+ (port (parameterize ((current-error-port (cdr error-pipe)))
+ (apply open-pipe* OPEN_READ
+ (car (%emacsclient)) "--eval" (expr->string expr)
+ (cdr (%emacsclient)))))
+ (output (read-string port))
+ (status (close-pipe port)))
+ (close-port (cdr error-pipe))
+ (unless (zero? status)
+ (raise (condition (&emacs-batch-error
+ (message (read-string (car error-pipe)))))))
+ (string-trim-both output (char-set-adjoin char-set:whitespace #\"))))
+
(define (emacs-generate-autoloads name directory)
"Generate autoloads for Emacs package NAME placed in DIRECTORY."
(let* ((file (string-append directory "/" name "-autoloads.el"))
diff --git a/guix/profiles.scm b/guix/profiles.scm
index 380f42c5a1..eca2b82cb3 100644
--- a/guix/profiles.scm
+++ b/guix/profiles.scm
@@ -2106,10 +2106,10 @@ (define %precious-variables
;; Environment variables in the default 'load-profile' allow list.
'("HOME" "USER" "LOGNAME" "DISPLAY" "XAUTHORITY" "TERM" "TZ" "PAGER"))
-(define (purify-environment allow-list allow-list-regexps)
+(define (purify-environment allow-list allow-list-regexps unsetenv-proc)
"Unset all environment variables except those that match the regexps in
ALLOW-LIST-REGEXPS and those listed in ALLOW-LIST."
- (for-each unsetenv
+ (for-each unsetenv-proc
(remove (lambda (variable)
(or (member variable allow-list)
(find (cut regexp-exec <> variable)
@@ -2121,23 +2121,29 @@ (define (purify-environment allow-list
allow-list-regexps)
(define* (load-profile profile
#:optional (manifest (profile-manifest profile))
#:key pure? (allow-list-regexps '())
- (allow-list %precious-variables))
+ (allow-list %precious-variables)
+ (getenv-proc getenv) (setenv-proc setenv)
+ (unsetenv-proc unsetenv))
"Set the environment variables specified by MANIFEST for PROFILE. When
PURE? is #t, unset the variables in the current environment except those that
match the regexps in ALLOW-LIST-REGEXPS and those listed in ALLOW-LIST.
Otherwise, augment existing environment variables with additional search
-paths."
+paths.
+GETENV-PROC is a one-argument procedure that returns an env var value.
+SETENV-PROC is a two-argument procedure the sets environment variables.
+UNSETENV-PROC is a one-argument procedure that unsets environment variables.
+Change those procedures to load a profile over a remote connection."
(when pure?
- (purify-environment allow-list allow-list-regexps))
+ (purify-environment allow-list allow-list-regexps unsetenv-proc))
(for-each (match-lambda
((($ <search-path-specification> variable _ separator) . value)
- (let ((current (getenv variable)))
- (setenv variable
- (if (and current (not pure?))
- (if separator
- (string-append value separator current)
- value)
- value)))))
+ (let ((current (getenv-proc variable)))
+ (setenv-proc variable
+ (if (and current (not pure?))
+ (if separator
+ (string-append value separator current)
+ value)
+ value)))))
(profile-search-paths profile manifest)))
(define (profile-regexp profile)
diff --git a/guix/scripts/environment.scm b/guix/scripts/environment.scm
index e1ab66c9ed..fa033dc0ae 100644
--- a/guix/scripts/environment.scm
+++ b/guix/scripts/environment.scm
@@ -3,6 +3,7 @@
;;; Copyright © 2015-2023 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Mike Gerwitz <mtg@gnu.org>
;;; Copyright © 2022, 2023 John Kehayias <john.kehayias@protonmail.com>
+;;; Copyright © 2023, Antero Mejr <antero@mailbox.org>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -29,6 +30,7 @@ (define-module (guix scripts environment)
#:use-module (guix profiles)
#:use-module (guix search-paths)
#:use-module (guix build utils)
+ #:use-module (guix build emacs-utils)
#:use-module (guix monads)
#:use-module ((guix gexp) #:select (lower-object))
#:autoload (guix describe) (current-profile current-channels)
@@ -72,6 +74,9 @@ (define-module (guix scripts environment)
(define %default-shell
(or (getenv "SHELL") "/bin/sh"))
+(define %remote-backends
+ '("emacsclient-eshell"))
+
(define* (show-search-paths profile manifest #:key pure?)
"Display the search paths of MANIFEST applied to PROFILE. When PURE? is #t,
do not augment existing environment variables with additional search paths."
@@ -104,6 +109,13 @@ (define (show-environment-options-help)
(display (G_ "
-r, --root=FILE make FILE a symlink to the result, and register it
as a garbage collector root"))
+ (display (G_ "
+ --remote=BACKEND[=ARGS]
+ create environment over a remote connection by
+ passing ARGS to BACKEND"))
+ (display (G_ "
+ --list-remote-backends
+ list available remote backends and exit"))
(display (G_ "
-C, --container run command within an isolated container"))
(display (G_ "
@@ -287,6 +299,13 @@ (define %options
(option '("bootstrap") #f #f
(lambda (opt name arg result)
(alist-cons 'bootstrap? #t result)))
+ (option '("remote") #t #f
+ (lambda (opt name arg result)
+ (alist-cons 'remote arg result)))
+ (option '("list-remote-backends") #f #f
+ (lambda args
+ (display (string-join %remote-backends "\n" 'suffix))
+ (exit 0)))
(append %transformation-options
%standard-build-options
@@ -719,6 +738,35 @@ (define* (launch-environment/fork command profile manifest
((_ . status)
status)))))
+(define* (launch-environment/eshell args command profile manifest
+ #:key pure? (allow-list '()))
+ "Create an new eshell buffer with an environment containing PROFILE,
+with the search paths specified by MANIFEST. When PURE?, pre-existing
+environment variables are cleared before setting the new ones, except those
+matching the regexps in ALLOW-LIST."
+
+ (parameterize ((%emacsclient (cons "emacsclient" args)))
+ (let* ((buf (emacsclient-batch-script '(buffer-name (eshell t))))
+ (ec-buf
+ (lambda (cmd)
+ (emacsclient-batch-script `(with-current-buffer ,buf ,cmd)))))
+ (load-profile
+ profile manifest #:pure? pure? #:allow-list-regexps allow-list
+ #:setenv-proc (lambda (var val)
+ (ec-buf (if (string=? var "PATH")
+ ;; TODO: TRAMP support?
+ `(eshell-set-path ,val)
+ `(setenv ,var ,val))))
+ #:unsetenv-proc (lambda (var)
+ (ec-buf `(setenv ,var))))
+ (match command
+ ((program . args)
+ (begin (ec-buf
+ `(eshell-command
+ ,(string-append program " " (string-join args))))
+ (ec-buf '(kill-buffer))))
+ (else #t)))))
+
(define* (launch-environment/container #:key command bash user user-mappings
profile manifest link-profile? network?
map-cwd? emulate-fhs? nesting?
@@ -748,7 +796,7 @@ (define* (launch-environment/container #:key command bash
user user-mappings
added to the container.
Preserve environment variables whose name matches the one of the regexps in
-WHILE-LIST."
+ALLOW-LIST."
(define (optional-mapping->fs mapping)
(and (file-exists? (file-system-mapping-source mapping))
(file-system-mapping->bind-mount mapping)))
@@ -1081,14 +1129,17 @@ (define (guix-environment* opts)
(bootstrap? (assoc-ref opts 'bootstrap?))
(system (assoc-ref opts 'system))
(profile (assoc-ref opts 'profile))
+ (remote (string-split (assoc-ref opts 'remote) #\=))
(command (or (assoc-ref opts 'exec)
;; Spawn a shell if the user didn't specify
;; anything in particular.
- (if container?
- ;; The user's shell is likely not available
- ;; within the container.
- '("/bin/sh")
- (list %default-shell))))
+ (cond (container?
+ ;; The user's shell is likely not available
+ ;; within the container.
+ '("/bin/sh"))
+ ;; For remote, let the backend decide.
+ (remote '())
+ (else (list %default-shell)))))
(mappings (pick-all opts 'file-system-mapping))
(allow-list (pick-all opts 'inherit-regexp)))
@@ -1129,6 +1180,10 @@ (define (guix-environment* opts)
(when (pair? symlinks)
(leave (G_ "'--symlink' cannot be used without '--container'~%"))))
+ (when (and remote (not (member (car remote) %remote-backends)))
+ (leave
+ (G_ "Invalid remote backend, see --list-remote-backends for
options.~%'")))
+
(with-store/maybe store
(with-status-verbosity (assoc-ref opts 'verbosity)
(define manifest-from-opts
@@ -1182,15 +1237,26 @@ (define (guix-environment* opts)
(mwhen (assoc-ref opts 'check?)
(return
- (if container?
+ (if (or container? remote)
(warning (G_ "'--check' is unnecessary \
-when using '--container'; doing nothing~%"))
+when using '--container' or '--remote'; doing nothing~%"))
(validate-child-shell-environment profile manifest))))
(cond
((assoc-ref opts 'search-paths)
(show-search-paths profile manifest #:pure? pure?)
(return #t))
+ (remote
+ (match (car remote)
+ ("emacsclient-eshell"
+ (return
+ (launch-environment/eshell
+ (match (cdr remote)
+ ((args) (string-split args #\space))
+ (_ '()))
+ command profile manifest
+ #:allow-list allow-list
+ #:pure? pure?)))))
(container?
(let ((bash-binary
(if bootstrap?
diff --git a/tests/build-emacs-utils.scm b/tests/build-emacs-utils.scm
index 4e851ed959..6b845b93b9 100644
--- a/tests/build-emacs-utils.scm
+++ b/tests/build-emacs-utils.scm
@@ -29,12 +29,22 @@ (define-module (test build-emacs-utils)
(test-begin "build-emacs-utils")
;; Only run the following tests if emacs is present.
-(test-skip (if (which "emacs") 0 5))
+(test-skip (if (which "emacs") 0 6))
(test-equal "emacs-batch-script: print foo from emacs"
"foo"
(emacs-batch-script '(princ "foo")))
+;; Note: If this test fails, subsequent runs might end up in a bad state.
+;; Running "emacsclient -s test -e '(kill-emacs)'" should fix it.
+(test-equal "emacsclient-batch-script: print foo from emacs via emacsclient"
+ "foo"
+ (begin (invoke (%emacs) "--quick" "--daemon=test")
+ (parameterize ((%emacsclient '("emacsclient" "-s" "test")))
+ (let ((out (emacsclient-batch-script '(princ "foo"))))
+ (emacsclient-batch-script '(kill-emacs))
+ out))))
+
(test-assert "emacs-batch-script: raise &emacs-batch-error on failure"
(guard (c ((emacs-batch-error? c)
;; The error message format changed between Emacs 27 and Emacs
--
2.41.0