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-rw-r--r--gnu/build/linux-initrd.scm3
-rw-r--r--guix/cpio.scm13
2 files changed, 15 insertions, 1 deletions
diff --git a/gnu/build/linux-initrd.scm b/gnu/build/linux-initrd.scm
index 815c7a0aeb..e26c067b49 100644
--- a/gnu/build/linux-initrd.scm
+++ b/gnu/build/linux-initrd.scm
@@ -68,7 +68,8 @@ COMPRESS? is true, compress it using GZIP. On success, return OUTPUT."
(call-with-output-file output
(lambda (port)
- (cpio:write-cpio-archive files port)))
+ (cpio:write-cpio-archive files port
+ #:file->header cpio:file->cpio-header*)))
(or (not compress?)
(and (zero? (system* gzip "--best" output))
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!!!")