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diff --git a/doc/guix.texi b/doc/guix.texi index b991cc1da4..51b0652aae 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -3022,6 +3022,59 @@ best course of action for that is to write the build code as a ``G-expression'', and to pass it to @code{gexp->derivation}. For more information, @pxref{G-Expressions}. +Once upon a time, @code{gexp->derivation} did not exist and constructing +derivations with build code written in Scheme was achieved with +@code{build-expression->derivation}, documented below. This procedure +is now deprecated in favor of the much nicer @code{gexp->derivation}. + +@deffn {Scheme Procedure} build-expression->derivation @var{store} @ + @var{name} @var{exp} @ + [#:system (%current-system)] [#:inputs '()] @ + [#:outputs '("out")] [#:hash #f] [#:hash-algo #f] @ + [#:recursive? #f] [#:env-vars '()] [#:modules '()] @ + [#:references-graphs #f] [#:allowed-references #f] @ + [#:local-build? #f] [#:substitutable? #t] [#: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, +@code{"out"} is assumed. @var{modules} is a list of names of Guile +modules from the current search path to be copied in the store, +compiled, and made available in the load path during the execution of +@var{exp}---e.g., @code{((guix build utils) (guix build +gnu-build-system))}. + +@var{exp} is evaluated in an environment where @code{%outputs} is bound +to a list of output/path pairs, and where @code{%build-inputs} is bound +to a list of string/output-path pairs made from @var{inputs}. +Optionally, @var{env-vars} is a list of string pairs specifying the name +and value of environment variables visible to the builder. The builder +terminates by passing the result of @var{exp} to @code{exit}; thus, when +@var{exp} returns @code{#f}, the build is considered to have failed. + +@var{exp} is built using @var{guile-for-build} (a derivation). 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}, @var{allowed-references}, @var{local-build?}, +and @var{substitutable?}. +@end deffn + +@noindent +Here's an example of a single-output derivation that creates a directory +containing one file: + +@lisp +(let ((builder '(let ((out (assoc-ref %outputs "out"))) + (mkdir out) ; create /gnu/store/@dots{}-goo + (call-with-output-file (string-append out "/test") + (lambda (p) + (display '(hello guix) p)))))) + (build-expression->derivation store "goo" builder)) + +@result{} #<derivation /gnu/store/@dots{}-goo.drv => @dots{}> +@end lisp + @node The Store Monad @section The Store Monad |