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

* 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 otherwise manipulate derivations. The lowest-level primitive to create
a derivation is the @code{derivation} procedure: 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 Build a derivation with the given arguments, and return the resulting
@code{<derivation>} object. @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 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 path is exported in the build environment in the corresponding file, in
a simple text format. 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 @end deffn
@noindent @noindent
@ -1494,7 +1503,7 @@ the caller to directly pass a Guile expression as the build script:
[#:system (%current-system)] [#:inputs '()] @ [#:system (%current-system)] [#:inputs '()] @
[#:outputs '("out")] [#:hash #f] [#:hash-algo #f] @ [#:outputs '("out")] [#:hash #f] [#:hash-algo #f] @
[#:env-vars '()] [#:modules '()] @ [#: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 Return a derivation that executes Scheme expression @var{exp} as a
builder for derivation @var{name}. @var{inputs} must be a list of 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, @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 @var{guile-for-build} is omitted or is @code{#f}, the value of the
@code{%guile-for-build} fluid is used instead. @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 @end deffn
@noindent @noindent

44
guix/derivations.scm
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@ -1,5 +1,5 @@
;;; GNU Guix --- Functional package management for GNU ;;; 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. ;;; This file is part of GNU Guix.
;;; ;;;
@ -532,7 +532,8 @@ the derivation called NAME with hash HASH."
(system (%current-system)) (env-vars '()) (system (%current-system)) (env-vars '())
(inputs '()) (outputs '("out")) (inputs '()) (outputs '("out"))
hash hash-algo hash-mode hash hash-algo hash-mode
references-graphs) references-graphs
local-build?)
"Build a derivation with the given arguments, and return the resulting "Build a derivation with the given arguments, and return the resulting
<derivation> object. When HASH, HASH-ALGO, and HASH-MODE are given, a <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 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 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 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) (define (add-output-paths drv)
;; Return DRV with an actual store path for each of its output and the ;; Return DRV with an actual store path for each of its output and the
;; corresponding environment variable. ;; 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 ;; 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 ;; derivations (urgh!). We hide that from our API, but here is the place
;; where we kludgify those options. ;; where we kludgify those options.
(match references-graphs (let ((env-vars (if local-build?
(((file . path) ...) `(("preferLocalBuild" . "1")
(let ((value (map (cut string-append <> " " <>) ,@env-vars)
file path))) env-vars)))
;; XXX: This all breaks down if an element of FILE or PATH contains (match references-graphs
;; white space. (((file . path) ...)
`(("exportReferencesGraph" . ,(string-join value " ")) (let ((value (map (cut string-append <> " " <>)
,@env-vars))) file path)))
(#f ;; XXX: This all breaks down if an element of FILE or PATH contains
env-vars))) ;; white space.
`(("exportReferencesGraph" . ,(string-join value " "))
,@env-vars)))
(#f
env-vars))))
(define (env-vars-with-empty-outputs env-vars) (define (env-vars-with-empty-outputs env-vars)
;; Return a variant of ENV-VARS where each OUTPUTS is associated with an ;; 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 '()) (env-vars '())
(modules '()) (modules '())
guile-for-build guile-for-build
references-graphs) references-graphs
local-build?)
"Return a derivation that executes Scheme expression EXP as a builder "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) 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 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 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. 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 (define guile-drv
(or guile-for-build (%guile-for-build))) (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 #:hash hash #:hash-algo hash-algo
#:outputs outputs #:outputs outputs
#:references-graphs references-graphs))) #:references-graphs references-graphs
#:local-build? local-build?)))