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gexp: 'gexp->script' and 'gexp->file' have a new #:module-path parameter. 

* guix/gexp.scm (load-path-expression): Add 'path' optional parameter.
(gexp->script): Add #:module-path and honor it.
(gexp->file): Likewise.
* tests/gexp.scm ("gexp->script #:module-path"): New test.
* doc/guix.texi (G-Expressions): Update accordingly.
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Ludovic Courtès 2018-03-23 18:21:28 +01:00
parent 7aff5d025d
commit 1ae16033f3
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3 changed files with 63 additions and 16 deletions
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10
doc/guix.texi
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@ -5150,9 +5150,11 @@ is a list of additional arguments to pass to @code{gexp->derivation}.
This is the declarative counterpart of @code{gexp->derivation}.
@end deffn
@deffn {Monadic Procedure} gexp->script @var{name} @var{exp}
@deffn {Monadic Procedure} gexp->script @var{name} @var{exp} @
[#:guile (default-guile)] [#:module-path %load-path]
Return an executable script @var{name} that runs @var{exp} using
@var{guile}, with @var{exp}'s imported modules in its search path.
Look up @var{exp}'s modules in @var{module-path}.
The example below builds a script that simply invokes the @command{ls}
command:
@ -5186,11 +5188,13 @@ This is the declarative counterpart of @code{gexp->script}.
@end deffn
@deffn {Monadic Procedure} gexp->file @var{name} @var{exp} @
[#:set-load-path? #t]
[#:set-load-path? #t] [#:module-path %load-path] @
[#:guile (default-guile)]
Return a derivation that builds a file @var{name} containing @var{exp}.
When @var{set-load-path?} is true, emit code in the resulting file to
set @code{%load-path} and @code{%load-compiled-path} to honor
@var{exp}'s imported modules.
@var{exp}'s imported modules. Look up @var{exp}'s modules in
@var{module-path}.
The resulting file holds references to all the dependencies of @var{exp}
or a subset thereof.

35
guix/gexp.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
;;;
;;; This file is part of GNU Guix.
@ -1116,11 +1116,14 @@ they can refer to each other."
(module-ref (resolve-interface '(gnu packages guile))
'guile-2.2))
(define (load-path-expression modules)
(define* (load-path-expression modules #:optional (path %load-path))
"Return as a monadic value a gexp that sets '%load-path' and
'%load-compiled-path' to point to MODULES, a list of module names."
(mlet %store-monad ((modules (imported-modules modules))
(compiled (compiled-modules modules)))
'%load-compiled-path' to point to MODULES, a list of module names. MODULES
are searched for in PATH."
(mlet %store-monad ((modules (imported-modules modules
#:module-path path))
(compiled (compiled-modules modules
#:module-path path)))
(return (gexp (eval-when (expand load eval)
(set! %load-path
(cons (ungexp modules) %load-path))
@ -1129,11 +1132,13 @@ they can refer to each other."
%load-compiled-path)))))))
(define* (gexp->script name exp
#:key (guile (default-guile)))
#:key (guile (default-guile))
(module-path %load-path))
"Return an executable script NAME that runs EXP using GUILE, with EXP's
imported modules in its search path."
imported modules in its search path. Look up EXP's modules in MODULE-PATH."
(mlet %store-monad ((set-load-path
(load-path-expression (gexp-modules exp))))
(load-path-expression (gexp-modules exp)
module-path)))
(gexp->derivation name
(gexp
(call-with-output-file (ungexp output)
@ -1148,12 +1153,16 @@ imported modules in its search path."
(write '(ungexp set-load-path) port)
(write '(ungexp exp) port)
(chmod port #o555)))))))
(chmod port #o555))))
#:module-path module-path)))
(define* (gexp->file name exp #:key (set-load-path? #t))
(define* (gexp->file name exp #:key
(set-load-path? #t)
(module-path %load-path))
"Return a derivation that builds a file NAME containing EXP. When
SET-LOAD-PATH? is true, emit code in the resulting file to set '%load-path'
and '%load-compiled-path' to honor EXP's imported modules."
and '%load-compiled-path' to honor EXP's imported modules. Lookup EXP's
modules in MODULE-PATH."
(match (if set-load-path? (gexp-modules exp) '())
(() ;zero modules
(gexp->derivation name
@ -1164,13 +1173,15 @@ and '%load-compiled-path' to honor EXP's imported modules."
#:local-build? #t
#:substitutable? #f))
((modules ...)
(mlet %store-monad ((set-load-path (load-path-expression modules)))
(mlet %store-monad ((set-load-path (load-path-expression modules
module-path)))
(gexp->derivation name
(gexp
(call-with-output-file (ungexp output)
(lambda (port)
(write '(ungexp set-load-path) port)
(write '(ungexp exp) port))))
#:module-path module-path
#:local-build? #t
#:substitutable? #f)))))

34
tests/gexp.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -25,6 +25,7 @@
#:use-module (guix packages)
#:use-module (guix tests)
#:use-module ((guix build utils) #:select (with-directory-excursion))
#:use-module ((guix utils) #:select (call-with-temporary-directory))
#:use-module (gnu packages)
#:use-module (gnu packages base)
#:use-module (gnu packages bootstrap)
@ -853,6 +854,37 @@
(return (and (zero? (close-pipe pipe))
(= (expt n 2) (string->number str)))))))
(test-assertm "gexp->script #:module-path"
(call-with-temporary-directory
(lambda (directory)
(define str
"Fake (guix base32) module!")
(mkdir (string-append directory "/guix"))
(call-with-output-file (string-append directory "/guix/base32.scm")
(lambda (port)
(write `(begin (define-module (guix base32))
(define-public %fake! ,str))
port)))
(mlet* %store-monad ((exp -> (with-imported-modules '((guix base32))
(gexp (begin
(use-modules (guix base32))
(write (list %load-path
%fake!))))))
(drv (gexp->script "guile-thing" exp
#:guile %bootstrap-guile
#:module-path (list directory)))
(out -> (derivation->output-path drv))
(done (built-derivations (list drv))))
(let* ((pipe (open-input-pipe out))
(data (read pipe)))
(return (and (zero? (close-pipe pipe))
(match data
((load-path str*)
(and (string=? str* str)
(not (member directory load-path))))))))))))
(test-assertm "program-file"
(let* ((n (random (expt 2 50)))
(exp (with-imported-modules '((guix build utils))