guix hash: Extract file hashing procedures.

* guix/scripts/hash.scm (guix-hash)[vcs-file?] (nar-hash, default-hash):
  Extract hashing logic to...
* guix/hash.scm (vcs-file?, file-hash*): ... these new procedures in this
  new file.

Modified-by: Maxime Devos <maximedevos@telenet.be>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

1 files changed, 4 insertions, 18 deletions

diff --git a/guix/scripts/hash.scm b/guix/scripts/hash.scm
index c44a4de9a4..9715dc7779 100644
--- a/guix/scripts/hash.scm
+++ b/guix/scripts/hash.scm
@@ -4,6 +4,7 @@
 ;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2018 Tim Gesthuizen <tim.gesthuizen@yahoo.de>
 ;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
+;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -24,6 +25,7 @@
   #:use-module (gcrypt hash)
   #:use-module (guix serialization)
   #:use-module (guix ui)
+  #:use-module (guix hash)
   #:use-module (guix scripts)
   #:use-module (guix base16)
   #:use-module (guix base32)
@@ -46,20 +48,14 @@
 (define* (nar-hash file #:optional
                    (algorithm (assoc-ref %default-options 'hash-algorithm))
                    select?)
-  (let-values (((port get-hash)
-                (open-hash-port algorithm)))
-    (write-file file port #:select? select?)
-    (force-output port)
-    (get-hash)))
+  (file-hash* file #:algorithm algorithm #:select? select? #:recursive? #true))
 
 (define* (default-hash file #:optional
                        (algorithm (assoc-ref %default-options 'hash-algorithm))
                        select?)
   (match file
     ("-" (port-hash algorithm (current-input-port)))
-    (_
-     (call-with-input-file file
-       (cute port-hash algorithm <>)))))
+    (_ (file-hash* file #:algorithm algorithm #:recursive? #false))))
 
 (define* (git-hash file #:optional
                        (algorithm (assoc-ref %default-options 'hash-algorithm))
@@ -181,16 +177,6 @@ use '--serializer' instead~%"))
     (parse-command-line args %options (list %default-options)
                         #:build-options? #f))
 
-  (define (vcs-file? file stat)
-    (case (stat:type stat)
-      ((directory)
-       (member (basename file) '(".bzr" ".git" ".hg" ".svn" "CVS")))
-      ((regular)
-       ;; Git sub-modules have a '.git' file that is a regular text file.
-       (string=? (basename file) ".git"))
-      (else
-       #f)))
-
   (let* ((opts (parse-options))
          (args (filter-map (match-lambda
                             (('argument . value)