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-rw-r--r--guix/grafts.scm17
1 files changed, 17 insertions, 0 deletions
diff --git a/guix/grafts.scm b/guix/grafts.scm
index 5074809c43..a1f7d8801a 100644
--- a/guix/grafts.scm
+++ b/guix/grafts.scm
@@ -21,6 +21,7 @@
#:use-module (guix derivations)
#:use-module ((guix utils) #:select (%current-system))
#:use-module (srfi srfi-1)
+ #:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:export (graft?
@@ -44,6 +45,22 @@
(replacement-output graft-replacement-output ;string | #f
(default "out")))
+(define (write-graft graft port)
+ "Write a concise representation of GRAFT to PORT."
+ (define (->string thing output)
+ (if (derivation? thing)
+ (derivation->output-path thing output)
+ thing))
+
+ (match graft
+ (($ <graft> origin origin-output replacement replacement-output)
+ (format port "#<graft ~a ==> ~a ~a>"
+ (->string origin origin-output)
+ (->string replacement replacement-output)
+ (number->string (object-address graft) 16)))))
+
+(set-record-type-printer! <graft> write-graft)
+
(define* (graft-derivation store drv grafts
#:key
(name (derivation-name drv))