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01/07: derivations: Add properties.

From: guix-commits
Subject: 01/07: derivations: Add properties.
Date: Wed, 28 Nov 2018 04:40:17 -0500 (EST)

civodul pushed a commit to branch master
in repository guix.

commit 8856f409d13cd7376be4319b9f75df0692c009d6
Author: Ludovic Court├Ęs <address@hidden>
Date:   Mon Nov 26 22:14:11 2018 +0100

    derivations: Add properties.
    * guix/derivations.scm (derivation): Add #:properties parameter.
    [user+system-env-vars]: Honor it.
    (derivation-properties): New procedure.
    (build-expression->derivation): Add #:properties and pass it to
    * guix/gexp.scm (gexp->derivation): Likewise.
    * tests/derivations.scm ("derivation-properties"): New test.
    * tests/gexp.scm ("gexp->derivation properties"): New test.
    * doc/guix.texi (Derivations, G-Expressions): Adjust accordingly.
 doc/guix.texi         |  8 ++++++--
 guix/derivations.scm  | 30 +++++++++++++++++++++++++-----
 guix/gexp.scm         |  4 +++-
 tests/derivations.scm | 10 ++++++++++
 tests/gexp.scm        | 10 +++++++++-
 5 files changed, 53 insertions(+), 9 deletions(-)

diff --git a/doc/guix.texi b/doc/guix.texi
index 917a3e9..c040a85 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -5060,7 +5060,7 @@ a derivation is the @code{derivation} procedure:
   [#:system (%current-system)] [#:references-graphs #f] @
   [#:allowed-references #f] [#:disallowed-references #f] @
   [#:leaked-env-vars #f] [#:local-build? #f] @
-  [#:substitutable? #t]
+  [#:substitutable? #t] [#:properties '()]
 Build a derivation with the given arguments, and return the resulting
 @code{<derivation>} object.
@@ -5097,6 +5097,9 @@ When @var{substitutable?} is false, declare that 
substitutes of the
 derivation's output should not be used (@pxref{Substitutes}).  This is
 useful, for instance, when building packages that capture details of the
 host CPU instruction set.
address@hidden must be an association list describing ``properties'' of the
+derivation.  It is kept as-is, uninterpreted, in the derivation.
 @end deffn
@@ -5790,7 +5793,8 @@ information about monads.)
        [#:leaked-env-vars #f] @
        [#:script-name (string-append @var{name} "-builder")] @
        [#:deprecation-warnings #f] @
-       [#:local-build? #f] [#:substitutable? #t] [#:guile-for-build #f]
+       [#:local-build? #f] [#:substitutable? #t] @
+       [#:properties '()] [#:guile-for-build #f]
 Return a derivation @var{name} that runs @var{exp} (a gexp) with
 @var{guile-for-build} (a derivation) on @var{system}; @var{exp} is
 stored in a file called @var{script-name}.  When @var{target} is true,
diff --git a/guix/derivations.scm b/guix/derivations.scm
index 7afecb1..f6176a7 100644
--- a/guix/derivations.scm
+++ b/guix/derivations.scm
@@ -80,6 +80,7 @@
+            derivation-properties
@@ -681,7 +682,8 @@ name of each input with that input's hash."
                      allowed-references disallowed-references
                      leaked-env-vars local-build?
-                     (substitutable? #t))
+                     (substitutable? #t)
+                     (properties '()))
   "Build a derivation with the given arguments, and return the resulting
 <derivation> object.  When HASH and HASH-ALGO are given, a
 fixed-output derivation is created---i.e., one whose result is known in
@@ -708,7 +710,10 @@ 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.
 When SUBSTITUTABLE? is false, declare that substitutes of the derivation's
-output should not be used."
+output should not be used.
+PROPERTIES must be an association list describing \"properties\" of the
+derivation.  It is kept as-is, uninterpreted, in the derivation."
   (define (add-output-paths drv)
     ;; Return DRV with an actual store path for each of its output and the
     ;; corresponding environment variable.
@@ -763,6 +768,10 @@ output should not be used."
                                . ,(string-join leaked-env-vars)))
+                      ,@(match properties
+                          (() '())
+                          (lst `(("guix properties"
+                                  . ,(object->string properties)))))
       (match references-graphs
         (((file . path) ...)
@@ -851,6 +860,14 @@ long-running processes that know what they're doing.  Use 
with care!"
   (invalidate-memoization! derivation-path->base16-hash)
   (hash-clear! %derivation-cache))
+(define derivation-properties
+  (mlambdaq (drv)
+    "Return the property alist associated with DRV."
+    (match (assoc "guix properties"
+                  (derivation-builder-environment-vars drv))
+      ((_ . str) (call-with-input-string str read))
+      (#f        '()))))
 (define* (map-derivation store drv mapping
                          #:key (system (%current-system)))
   "Given MAPPING, a list of pairs of derivations, return a derivation based on
@@ -1129,7 +1146,8 @@ they can refer to each other."
-                                       local-build? (substitutable? #t))
+                                       local-build? (substitutable? #t)
+                                       (properties '()))
   "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
@@ -1149,7 +1167,8 @@ EXP is built using GUILE-FOR-BUILD (a derivation).  When 
 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,
   (define guile-drv
     (or guile-for-build (%guile-for-build)))
                 #:allowed-references allowed-references
                 #:disallowed-references disallowed-references
                 #:local-build? local-build?
-                #:substitutable? substitutable?)))
+                #:substitutable? substitutable?
+                #:properties properties)))
diff --git a/guix/gexp.scm b/guix/gexp.scm
index f33fb19..786e378 100644
--- a/guix/gexp.scm
+++ b/guix/gexp.scm
@@ -631,6 +631,7 @@ names and file names suitable for the #:allowed-references 
argument to
                            allowed-references disallowed-references
                            local-build? (substitutable? #t)
+                           (properties '())
                            ;; TODO: This parameter is transitional; it's here
                            ;; to avoid a full rebuild.  Remove it on the next
@@ -800,7 +801,8 @@ The other arguments are as for 'derivation'."
                       #:disallowed-references disallowed
                       #:leaked-env-vars leaked-env-vars
                       #:local-build? local-build?
-                      #:substitutable? substitutable?))))
+                      #:substitutable? substitutable?
+                      #:properties properties))))
 (define* (gexp-inputs exp #:key native?)
   "Return the input list for EXP.  When NATIVE? is true, return only native
diff --git a/tests/derivations.scm b/tests/derivations.scm
index 159a697..5f294c1 100644
--- a/tests/derivations.scm
+++ b/tests/derivations.scm
@@ -1132,6 +1132,16 @@
                                     ((p2 . _)
                                      (string<? p1 p2)))))))))))))
+(test-equal "derivation-properties"
+  (list '() '((type . test)))
+  (let ((drv1 (build-expression->derivation %store "bar"
+                                            '(mkdir %output)))
+        (drv2 (build-expression->derivation %store "foo"
+                                           '(mkdir %output)
+                                           #:properties '((type . test)))))
+    (list (derivation-properties drv1)
+          (derivation-properties drv2))))
 (test-equal "map-derivation"
   (let* ((joke (package-derivation %store guile-1.8))
diff --git a/tests/gexp.scm b/tests/gexp.scm
index ab60bda..7ae9201 100644
--- a/tests/gexp.scm
+++ b/tests/gexp.scm
@@ -476,7 +476,15 @@
     (return (and (string=? (readlink (string-append out "/foo")) guile)
                  (string=? (readlink out2) file)
                  (equal? refs (list (dirname (dirname guile))))
-                 (equal? refs2 (list file))))))
+                 (equal? refs2 (list file))
+                 (null? (derivation-properties drv))))))
+(test-assertm "gexp->derivation properties"
+  (mlet %store-monad ((drv (gexp->derivation "foo"
+                                             #~(mkdir #$output)
+                                             #:properties '((type . test)))))
+    (return (equal? '((type . test))
+                    (derivation-properties drv)))))
 (test-assertm "gexp->derivation vs. grafts"
   (mlet* %store-monad ((graft?  (set-grafting #f))

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