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-rw-r--r--guix/store.scm23
-rw-r--r--tests/store.scm27
2 files changed, 49 insertions, 1 deletions
diff --git a/guix/store.scm b/guix/store.scm
index 0f1e2f9466..290118d74b 100644
--- a/guix/store.scm
+++ b/guix/store.scm
@@ -87,7 +87,8 @@
store-path?
derivation-path?
store-path-package-name
- store-path-hash-part))
+ store-path-hash-part
+ log-file))
(define %protocol-version #x10c)
@@ -660,3 +661,23 @@ syntactically valid store path."
"/([0-9a-df-np-sv-z]{32})-[^/]+$"))))
(and=> (regexp-exec path-rx path)
(cut match:substring <> 1))))
+
+(define (log-file store file)
+ "Return the build log file for FILE, or #f if none could be found. FILE
+must be an absolute store file name, or a derivation file name."
+ (define state-dir ; XXX: factorize
+ (or (getenv "NIX_STATE_DIR") %state-directory))
+
+ (cond ((derivation-path? file)
+ (let* ((base (basename file))
+ (log (string-append (dirname state-dir) ; XXX: ditto
+ "/log/nix/drvs/"
+ (string-take base 2) "/"
+ (string-drop base 2) ".bz2")))
+ (and (file-exists? log) log)))
+ (else
+ (match (valid-derivers store file)
+ ((derivers ...)
+ ;; Return the first that works.
+ (any (cut log-file store <>) derivers))
+ (_ #f)))))
diff --git a/tests/store.scm b/tests/store.scm
index b5e0cb0eab..430027c33b 100644
--- a/tests/store.scm
+++ b/tests/store.scm
@@ -140,6 +140,33 @@
(equal? (valid-derivers %store o)
(list (derivation-file-name d))))))
+(test-assert "log-file, derivation"
+ (let* ((b (add-text-to-store %store "build" "echo $foo > $out" '()))
+ (s (add-to-store %store "bash" #t "sha256"
+ (search-bootstrap-binary "bash"
+ (%current-system))))
+ (d (derivation %store "the-thing"
+ s `("-e" ,b)
+ #:env-vars `(("foo" . ,(random-text)))
+ #:inputs `((,b) (,s)))))
+ (and (build-derivations %store (list d))
+ (file-exists? (pk (log-file %store (derivation-file-name d)))))))
+
+(test-assert "log-file, output file name"
+ (let* ((b (add-text-to-store %store "build" "echo $foo > $out" '()))
+ (s (add-to-store %store "bash" #t "sha256"
+ (search-bootstrap-binary "bash"
+ (%current-system))))
+ (d (derivation %store "the-thing"
+ s `("-e" ,b)
+ #:env-vars `(("foo" . ,(random-text)))
+ #:inputs `((,b) (,s))))
+ (o (derivation->output-path d)))
+ (and (build-derivations %store (list d))
+ (file-exists? (pk (log-file %store o)))
+ (string=? (log-file %store (derivation-file-name d))
+ (log-file %store o)))))
+
(test-assert "no substitutes"
(let* ((s (open-connection))
(d1 (package-derivation s %bootstrap-guile (%current-system)))