cuirass: Optionally support using of substitutes.

* bin/cuirass.in (options): Add --use-substitutes.
(show-help): Idem.
(main): Set %use-substitutes?.

Signed-off-by: Mathieu Lirzin <mthl@gnu.org>

bin/cuirass.in

@@ -35,6 +35,7 @@ exec ${GUILE:-@GUILE@} --no-auto-compile -e main -s "$0" "$@"
                             Add specifications from SPECFILE to database.
   -D  --database=DB         Use DB to store build results.
   -I, --interval=N          Wait N seconds between each poll
+      --use-substitutes     Allow usage of pre-built substitutes
   -V, --version             Display version
   -h, --help                Display this help message")
   (newline)
@@ -46,6 +47,7 @@ exec ${GUILE:-@GUILE@} --no-auto-compile -e main -s "$0" "$@"
     (specifications (single-char #\S) (value #t))
     (database       (single-char #\D) (value #t))
     (interval       (single-char #\I) (value #t))
+    (use-substitutes                  (value #f))
     (version        (single-char #\V) (value #f))
     (help           (single-char #\h) (value #f))))
 
@@ -60,7 +62,8 @@ exec ${GUILE:-@GUILE@} --no-auto-compile -e main -s "$0" "$@"
         ((%program-name     (car args))
          (%package-database (option-ref opts 'database (%package-database)))
          (%package-cachedir
-          (option-ref opts 'cache-directory (%package-cachedir))))
+          (option-ref opts 'cache-directory (%package-cachedir)))
+         (%use-substitutes? (option-ref opts 'use-substitutes #f)))
       (cond
        ((option-ref opts 'help #f)
         (show-help)

bin/evaluate.in

@@ -44,8 +44,9 @@ exec ${GUILE:-@GUILE@} --no-auto-compile -e main -s "$0" "$@"
               (string-append cachedir "/" (assq-ref spec #:name))
             (primitive-load (assq-ref spec #:file)))))
        (with-store store
-         ;; Make sure we don't resort to substitutes.
-         (set-build-options store #:use-substitutes? #f #:substitute-urls '())
+         (unless (assoc-ref spec #:use-substitutes?)
+           ;; Make sure we don't resort to substitutes.
+           (set-build-options store #:use-substitutes? #f #:substitute-urls '()))
          ;; Grafts can trigger early builds.  We do not want that to happen
          ;; during evaluation, so use a sledgehammer to catch such problems.
          (set! build-things
@@ -54,7 +55,8 @@ exec ${GUILE:-@GUILE@} --no-auto-compile -e main -s "$0" "$@"
                           stderr)
                  (simple-format stderr "'build-things' arguments: ~S~%" args)
                  (exit 1)))
-         (parameterize ((%package-database database))
+         (parameterize ((%package-database database)
+                        (%use-substitutes? (assoc-ref spec #:use-substitutes?)))
            ;; Call the entry point of FILE and print the resulting job sexp.
            (let* ((proc    (module-ref %user-module 'hydra-jobs))
                   (thunks  (proc store (assq-ref spec #:arguments)))

src/cuirass/base.scm

@@ -34,7 +34,12 @@
             build-packages
             process-specs
             ;; Parameters.
-            %package-cachedir))
+            %package-cachedir
+            %use-substitutes?))
+
+(define %use-substitutes?
+  ;; Define whether to use substitutes
+  (make-parameter #f))
 
 (define %package-cachedir
   ;; Define to location of cache directory of this package.
@@ -149,7 +154,8 @@ if required."
                   (with-store store
                     (let* ((spec* (acons #:current-commit commit spec))
                            (jobs  (evaluate store db spec*)))
-                      (set-build-options store #:use-substitutes? #f)
+                      (unless (%use-substitutes?)
+                        (set-build-options store #:use-substitutes? #f))
                       (build-packages store db jobs))))
                 (db-add-stamp db spec commit)))
             jobspecs))