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-rw-r--r--guix/store.scm41
1 files changed, 41 insertions, 0 deletions
diff --git a/guix/store.scm b/guix/store.scm
index 8746d3c2d6..56aa38ba8d 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -27,6 +27,7 @@
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-9 gnu)
+ #:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
@@ -93,6 +94,7 @@
path-info-nar-size
references
+ references/substitutes
requisites
referrers
optimize-store
@@ -724,6 +726,45 @@ error if there is no such root."
"Return the list of references of PATH."
store-path-list))
+(define (references/substitutes store items)
+ "Return the list of list of references of ITEMS; the result has the same
+length as ITEMS. Query substitute information for any item missing from the
+store at once. Raise a '&nix-protocol-error' exception if reference
+information for one of ITEMS is missing."
+ (let* ((local-refs (map (lambda (item)
+ (guard (c ((nix-protocol-error? c) #f))
+ (references store item)))
+ items))
+ (missing (fold-right (lambda (item local-ref result)
+ (if local-ref
+ result
+ (cons item result)))
+ '()
+ items local-refs))
+
+ ;; Query all the substitutes at once to minimize the cost of
+ ;; launching 'guix substitute' and making HTTP requests.
+ (substs (substitutable-path-info store missing)))
+ (when (< (length substs) (length missing))
+ (raise (condition (&nix-protocol-error
+ (message "cannot determine \
+the list of references")
+ (status 1)))))
+
+ ;; Intersperse SUBSTS and LOCAL-REFS.
+ (let loop ((local-refs local-refs)
+ (remote-refs (map substitutable-references substs))
+ (result '()))
+ (match local-refs
+ (()
+ (reverse result))
+ ((#f tail ...)
+ (match remote-refs
+ ((remote rest ...)
+ (loop tail rest (cons remote result)))))
+ ((head tail ...)
+ (loop tail remote-refs (cons head result)))))))
+
(define* (fold-path store proc seed path
#:optional (relatives (cut references store <>)))
"Call PROC for each of the RELATIVES of PATH, exactly once, and return the