diff options
Diffstat (limited to 'guix/store')
| -rw-r--r-- | guix/store/deduplication.scm | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/guix/store/deduplication.scm b/guix/store/deduplication.scm index 8234819f14..8c19d7309e 100644 --- a/guix/store/deduplication.scm +++ b/guix/store/deduplication.scm @@ -31,14 +31,38 @@ #:export (nar-sha256 deduplicate)) +;; XXX: This port is used as a workaround on Guile <= 2.2.4 where +;; 'port-position' throws to 'out-of-range' when the offset is great than or +;; equal to 2^32: <https://bugs.gnu.org/32161>. +(define (counting-wrapper-port output-port) + "Return two values: an output port that wraps OUTPUT-PORT, and a thunk to +retrieve the number of bytes written to OUTPUT-PORT." + (let ((byte-count 0)) + (values (make-custom-binary-output-port "counting-wrapper" + (lambda (bytes offset count) + (put-bytevector output-port bytes + offset count) + (set! byte-count + (+ byte-count count)) + count) + (lambda () + byte-count) + #f + (lambda () + (close-port output-port))) + (lambda () + byte-count)))) + (define (nar-sha256 file) "Gives the sha256 hash of a file and the size of the file in nar form." - (let-values (((port get-hash) (open-sha256-port))) - (write-file file port) + (let*-values (((port get-hash) (open-sha256-port)) + ((wrapper get-size) (counting-wrapper-port port))) + (write-file file wrapper) + (force-output wrapper) (force-output port) (let ((hash (get-hash)) - (size (port-position port))) - (close-port port) + (size (get-size))) + (close-port wrapper) (values hash size)))) (define (tempname-in directory) |