1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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 Guix 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 Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix remote)
#:use-module (guix ssh)
#:use-module (guix gexp)
#:use-module (guix inferior)
#:use-module (guix store)
#:use-module (guix monads)
#:use-module (guix modules)
#:use-module (guix derivations)
#:use-module (ssh popen)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:export (remote-eval))
;;; Commentary:
;;;
;;; Note: This API is experimental and subject to change!
;;;
;;; Evaluate a gexp on a remote machine, over SSH, ensuring that all the
;;; elements the gexp refers to are deployed beforehand. This is useful for
;;; expressions that have side effects; for pure expressions, you would rather
;;; build a derivation remotely or offload it.
;;;
;;; Code:
(define (remote-pipe-for-gexp lowered session)
"Return a remote pipe for the given SESSION to evaluate LOWERED."
(define shell-quote
(compose object->string object->string))
(apply open-remote-pipe* session OPEN_READ
(string-append (derivation->output-path
(lowered-gexp-guile lowered))
"/bin/guile")
"--no-auto-compile"
(append (append-map (lambda (directory)
`("-L" ,directory))
(lowered-gexp-load-path lowered))
(append-map (lambda (directory)
`("-C" ,directory))
(lowered-gexp-load-path lowered))
`("-c"
,(shell-quote (lowered-gexp-sexp lowered))))))
(define (%remote-eval lowered session)
"Evaluate LOWERED, a lowered gexp, in SESSION. This assumes that all the
prerequisites of EXP are already available on the host at SESSION."
(let* ((pipe (remote-pipe-for-gexp lowered session))
(result (read-repl-response pipe)))
(close-port pipe)
result))
(define (trampoline exp)
"Return a \"trampoline\" gexp that evaluates EXP and writes the evaluation
result to the current output port using the (guix repl) protocol."
(define program
(scheme-file "remote-exp.scm" exp))
(with-imported-modules (source-module-closure '((guix repl)))
#~(begin
(use-modules (guix repl))
(send-repl-response '(primitive-load #$program)
(current-output-port))
(force-output))))
(define* (remote-eval exp session
#:key
(build-locally? #t)
(module-path %load-path)
(socket-name "/var/guix/daemon-socket/socket"))
"Evaluate EXP, a gexp, on the host at SESSION, an SSH session. Ensure that
all the elements EXP refers to are built and deployed to SESSION beforehand.
When BUILD-LOCALLY? is true, said dependencies are built locally and sent to
the remote store afterwards; otherwise, dependencies are built directly on the
remote store."
(mlet %store-monad ((lowered (lower-gexp (trampoline exp)
#:module-path %load-path))
(remote -> (connect-to-remote-daemon session
socket-name)))
(define inputs
(cons (gexp-input (lowered-gexp-guile lowered))
(lowered-gexp-inputs lowered)))
(define to-build
(map (lambda (input)
(if (derivation? (gexp-input-thing input))
(cons (gexp-input-thing input)
(gexp-input-output input))
(gexp-input-thing input)))
inputs))
(if build-locally?
(let ((to-send (map (lambda (input)
(match (gexp-input-thing input)
((? derivation? drv)
(derivation->output-path
drv (gexp-input-output input)))
((? store-path? item)
item)))
inputs)))
(mbegin %store-monad
(built-derivations to-build)
((store-lift send-files) to-send remote #:recursive? #t)
(return (close-connection remote))
(return (%remote-eval lowered session))))
(let ((to-send (map (lambda (input)
(match (gexp-input-thing input)
((? derivation? drv)
(derivation-file-name drv))
((? store-path? item)
item)))
inputs)))
(mbegin %store-monad
((store-lift send-files) to-send remote #:recursive? #t)
(return (build-derivations remote to-build))
(return (close-connection remote))
(return (%remote-eval lowered session)))))))
|
