From eae5b3fff54e6f0a38d03d01187142accbed1eb8 Mon Sep 17 00:00:00 2001
From: Ludovic Courtès <ludo@gnu.org>
Date: Wed, 24 Jun 2015 18:02:15 +0200
Subject: linux-initrd: Produce cpio archives with zeroed timestamps, etc.

* guix/cpio.scm (file->cpio-header*): New procedure.
* gnu/build/linux-initrd.scm (write-cpio-archive): Add #:file->header argument
  to 'cpio:write-cpio-archive'.
---
 guix/cpio.scm | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'guix')

diff --git a/guix/cpio.scm b/guix/cpio.scm
index f1c2130bfa..e4692e2e9c 100644
--- a/guix/cpio.scm
+++ b/guix/cpio.scm
@@ -26,6 +26,7 @@
   #:export (cpio-header?
             make-cpio-header
             file->cpio-header
+            file->cpio-header*
             write-cpio-header
             read-cpio-header
 
@@ -174,6 +175,18 @@ using FILE-NAME as its file name."
                       #:rdev (stat:rdev st)
                       #:name-size (string-length file-name))))
 
+(define* (file->cpio-header* file
+                             #:optional (file-name file)
+                             #:key (stat lstat))
+  "Similar to 'file->cpio-header', but return a header with a zeroed
+modification time, inode number, UID/GID, etc.  This allows archives to be
+produced in a deterministic fashion."
+  (let ((st (stat file)))
+    (make-cpio-header #:mode (stat:mode st)
+                      #:nlink (stat:nlink st)
+                      #:size (stat:size st)
+                      #:name-size (string-length file-name))))
+
 (define %trailer
   "TRAILER!!!")
 
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