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derivations: Add #:local-build? parameter for derivations.

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* guix/derivations.scm (derivation): Add #:local-build? parameter and
  honor it.
  (build-expression->derivation): Likewise.
* doc/guix.texi (Derivations): Update documentation of these
  procedures.
This commit is contained in:
Ludovic Courtès 2014-01-25 17:04:35 +01:00
parent b6cbb314d9
commit 1909431c5b
2 changed files with 41 additions and 19 deletions
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16
doc/guix.texi
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@ -1452,7 +1452,11 @@ derivations as Scheme objects, along with procedures to create and
otherwise manipulate derivations. The lowest-level primitive to create
a derivation is the @code{derivation} procedure:
@deffn {Scheme Procedure} derivation @var{store} @var{name} @var{builder} @var{args} [#:outputs '("out")] [#:hash #f] [#:hash-algo #f] [#:hash-mode #f] [#:inputs '()] [#:env-vars '()] [#:system (%current-system)] [#:references-graphs #f]
@deffn {Scheme Procedure} derivation @var{store} @var{name} @var{builder} @
@var{args} [#:outputs '("out")] [#:hash #f] [#:hash-algo #f] @
[#:hash-mode #f] [#:inputs '()] [#:env-vars '()] @
[#:system (%current-system)] [#:references-graphs #f] @
[#:local-build? #f]
Build a derivation with the given arguments, and return the resulting
@code{<derivation>} object.
@ -1464,6 +1468,11 @@ When @var{references-graphs} is true, it must be a list of file
name/store path pairs. In that case, the reference graph of each store
path is exported in the build environment in the corresponding file, in
a simple text format.
When @var{local-build?} is true, declare that the derivation is not a
good candidate for offloading and should rather be built locally
(@pxref{Daemon Offload Setup}). This is the case for small derivations
where the costs of data transfers would outweigh the benefits.
@end deffn
@noindent
@ -1494,7 +1503,7 @@ the caller to directly pass a Guile expression as the build script:
[#:system (%current-system)] [#:inputs '()] @
[#:outputs '("out")] [#:hash #f] [#:hash-algo #f] @
[#:env-vars '()] [#:modules '()] @
[#:references-graphs #f] [#:guile-for-build #f]
[#:references-graphs #f] [#:local-build? #f] [#:guile-for-build #f]
Return a derivation that executes Scheme expression @var{exp} as a
builder for derivation @var{name}. @var{inputs} must be a list of
@code{(name drv-path sub-drv)} tuples; when @var{sub-drv} is omitted,
@ -1516,7 +1525,8 @@ terminates by passing the result of @var{exp} to @code{exit}; thus, when
@var{guile-for-build} is omitted or is @code{#f}, the value of the
@code{%guile-for-build} fluid is used instead.
See the @code{derivation} procedure for the meaning of @var{references-graphs}.
See the @code{derivation} procedure for the meaning of @var{references-graphs}
and @var{local-build?}.
@end deffn
@noindent

44
guix/derivations.scm
View File

@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2012, 2013 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
@ -532,7 +532,8 @@ the derivation called NAME with hash HASH."
(system (%current-system)) (env-vars '())
(inputs '()) (outputs '("out"))
hash hash-algo hash-mode
references-graphs)
references-graphs
local-build?)
"Build a derivation with the given arguments, and return the resulting
<derivation> object. When HASH, HASH-ALGO, and HASH-MODE are given, a
fixed-output derivation is created---i.e., one whose result is known in
@ -540,7 +541,11 @@ advance, such as a file download.
When REFERENCES-GRAPHS is true, it must be a list of file name/store path
pairs. In that case, the reference graph of each store path is exported in
the build environment in the corresponding file, in a simple text format."
the build environment in the corresponding file, in a simple text format.
When LOCAL-BUILD? is true, declare that the derivation is not a good candidate
for offloading and should rather be built locally. This is the case for small
derivations where the costs of data transfers would outweigh the benefits."
(define (add-output-paths drv)
;; Return DRV with an actual store path for each of its output and the
;; corresponding environment variable.
@ -571,16 +576,20 @@ the build environment in the corresponding file, in a simple text format."
;; Some options are passed to the build daemon via the env. vars of
;; derivations (urgh!). We hide that from our API, but here is the place
;; where we kludgify those options.
(match references-graphs
(((file . path) ...)
(let ((value (map (cut string-append <> " " <>)
file path)))
;; XXX: This all breaks down if an element of FILE or PATH contains
;; white space.
`(("exportReferencesGraph" . ,(string-join value " "))
,@env-vars)))
(#f
env-vars)))
(let ((env-vars (if local-build?
`(("preferLocalBuild" . "1")
,@env-vars)
env-vars)))
(match references-graphs
(((file . path) ...)
(let ((value (map (cut string-append <> " " <>)
file path)))
;; XXX: This all breaks down if an element of FILE or PATH contains
;; white space.
`(("exportReferencesGraph" . ,(string-join value " "))
,@env-vars)))
(#f
env-vars))))
(define (env-vars-with-empty-outputs env-vars)
;; Return a variant of ENV-VARS where each OUTPUTS is associated with an
@ -904,7 +913,8 @@ they can refer to each other."
(env-vars '())
(modules '())
guile-for-build
references-graphs)
references-graphs
local-build?)
"Return a derivation that executes Scheme expression EXP as a builder
for derivation NAME. INPUTS must be a list of (NAME DRV-PATH SUB-DRV)
tuples; when SUB-DRV is omitted, \"out\" is assumed. MODULES is a list
@ -923,7 +933,8 @@ EXP returns #f, the build is considered to have failed.
EXP is built using GUILE-FOR-BUILD (a derivation). When GUILE-FOR-BUILD is
omitted or is #f, the value of the `%guile-for-build' fluid is used instead.
See the `derivation' procedure for the meaning of REFERENCES-GRAPHS."
See the `derivation' procedure for the meaning of REFERENCES-GRAPHS and
LOCAL-BUILD?."
(define guile-drv
(or guile-for-build (%guile-for-build)))
@ -1046,4 +1057,5 @@ See the `derivation' procedure for the meaning of REFERENCES-GRAPHS."
#:hash hash #:hash-algo hash-algo
#:outputs outputs
#:references-graphs references-graphs)))
#:references-graphs references-graphs
#:local-build? local-build?)))