diff options
Diffstat (limited to 'guix/grafts.scm')
| -rw-r--r-- | guix/grafts.scm | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/guix/grafts.scm b/guix/grafts.scm index 53e697688a..3e7a81a4c7 100644 --- a/guix/grafts.scm +++ b/guix/grafts.scm @@ -227,13 +227,29 @@ resulting list of grafts. This is a monadic procedure in %STATE-MONAD where the state is a vhash mapping derivations to the corresponding set of grafts." + (define (graft-origin? drv graft) + ;; Return true if DRV corresponds to the origin of GRAFT. + (match graft + (($ <graft> (? derivation? origin) output) + (match (assoc-ref (derivation->output-paths drv) output) + ((? string? result) + (string=? result + (derivation->output-path origin output))) + (_ + #f))) + (_ + #f))) + (define (dependency-grafts item) (let-values (((drv output) (item->deriver store item))) (if drv - (cumulative-grafts store drv grafts references - #:outputs (list output) - #:guile guile - #:system system) + ;; If GRAFTS already contains a graft from DRV, do not override it. + (if (find (cut graft-origin? drv <>) grafts) + (state-return grafts) + (cumulative-grafts store drv grafts references + #:outputs (list output) + #:guile guile + #:system system)) (state-return grafts)))) (define (return/cache cache value) |