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-rw-r--r--guix/derivations.scm60
1 files changed, 51 insertions, 9 deletions
diff --git a/guix/derivations.scm b/guix/derivations.scm
index 09f58f0fb8..7bc14586ba 100644
--- a/guix/derivations.scm
+++ b/guix/derivations.scm
@@ -49,7 +49,10 @@
read-derivation
write-derivation
derivation-path->output-path
- derivation))
+ derivation
+
+ %guile-for-build
+ build-expression->derivation))
;;;
;;; Nix derivations, as implemented in Nix's `derivations.cc'.
@@ -282,14 +285,14 @@ known in advance, such as a file download."
system builder args env-vars)
(let* ((drv-hash (derivation-hash drv))
(outputs (map (match-lambda
- ((output-name . ($ <derivation-output>
- _ algo hash))
- (let ((path (output-path output-name
- drv-hash name)))
- (cons output-name
- (make-derivation-output path algo
- hash)))))
- outputs)))
+ ((output-name . ($ <derivation-output>
+ _ algo hash))
+ (let ((path (output-path output-name
+ drv-hash name)))
+ (cons output-name
+ (make-derivation-output path algo
+ hash)))))
+ outputs)))
(make-derivation outputs inputs sources system builder args
(map (match-lambda
((name . value)
@@ -351,3 +354,42 @@ known in advance, such as a file download."
(map derivation-input-path
inputs))
drv)))
+
+
+;;;
+;;; Guile-based builders.
+;;;
+
+(define %guile-for-build
+ ;; The derivation of the Guile to be used within the build environment,
+ ;; when using `build-expression->derivation'.
+ (make-parameter (false-if-exception (nixpkgs-derivation "guile"))))
+
+(define* (build-expression->derivation store name system exp inputs
+ #:key hash hash-algo)
+ "Return a derivation that executes Scheme expression EXP as a builder for
+derivation NAME. INPUTS must be a list of string/derivation-path pairs. EXP
+is evaluated in an environment where %OUTPUT is bound to the output path, and
+where %BUILD-INPUTS is bound to an alist of string/output-path pairs made
+from INPUTS."
+ (define guile
+ (string-append (derivation-path->output-path (%guile-for-build))
+ "/bin/guile"))
+
+ (let* ((prologue `(begin
+ (define %output (getenv "out"))
+ (define %build-inputs
+ ',(map (match-lambda
+ ((name . drv)
+ (cons name
+ (derivation-path->output-path drv))))
+ inputs))) )
+ (builder (add-text-to-store store
+ (string-append name "-guile-builder")
+ (string-append (object->string prologue)
+ (object->string exp))
+ (map cdr inputs))))
+ (derivation store name system guile `("--no-auto-compile" ,builder)
+ '(("HOME" . "/homeless"))
+ `((,(%guile-for-build))
+ (,builder)))))