[PATCH 1/2] build: union: Add create-all-directory? parameter to union-build

[huang_ying_caritas]

From: Huang Ying <huang.ying.cari...@gmail.com>

* guix/build/union.scm (union-build): Add create-all-directory? keyword
  parameter.  To add/remove some files from the directory.
---
 guix/build/union.scm | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/guix/build/union.scm b/guix/build/union.scm
index 6640b5652..4783066be 100644
--- a/guix/build/union.scm
+++ b/guix/build/union.scm
@@ -73,7 +73,8 @@ identical, #f otherwise."
                                   (loop)))))))))))))
 
 (define* (union-build output inputs
-                      #:key (log-port (current-error-port)))
+                      #:key (log-port (current-error-port))
+                      (create-all-directory? #f))
   "Build in the OUTPUT directory a symlink tree that is the union of all
 the INPUTS."
 
@@ -104,8 +105,10 @@ the INPUTS."
   (define (union output inputs)
     (match inputs
       ((input)
-       ;; There's only one input, so just make a link.
-       (symlink* input output))
+       ;; There's only one input, so just make a link unless 
create-all-directory?
+       (if (and create-all-directory? (file-is-directory? input))
+           (union-of-directories output inputs)
+           (symlink* input output)))
       (_
        (call-with-values (lambda () (partition file-is-directory? inputs))
          (match-lambda*
-- 
2.11.1