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-rw-r--r--guix/cpio.scm20
1 files changed, 20 insertions, 0 deletions
diff --git a/guix/cpio.scm b/guix/cpio.scm
index 5d38573971..c9932f5bf9 100644
--- a/guix/cpio.scm
+++ b/guix/cpio.scm
@@ -27,6 +27,7 @@
make-cpio-header
file->cpio-header
file->cpio-header*
+ special-file->cpio-header*
write-cpio-header
read-cpio-header
@@ -190,6 +191,25 @@ produced in a deterministic fashion."
#:size (stat:size st)
#:name-size (string-length file-name))))
+(define* (special-file->cpio-header* file
+ device-type
+ device-major
+ device-minor
+ permission-bits
+ #:optional (file-name file))
+ "Create a character or block device header.
+
+DEVICE-TYPE is either 'char-special or 'block-special.
+
+The number of hard links is assumed to be 1."
+ (make-cpio-header #:mode (logior (match device-type
+ ('block-special C_ISBLK)
+ ('char-special C_ISCHR))
+ permission-bits)
+ #:nlink 1
+ #:rdev (device-number device-major device-minor)
+ #:name-size (string-length file-name)))
+
(define %trailer
"TRAILER!!!")