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-rw-r--r--gnu/build/vm.scm13
1 files changed, 13 insertions, 0 deletions
diff --git a/gnu/build/vm.scm b/gnu/build/vm.scm
index 2d41c5756b..d8c53ef37f 100644
--- a/gnu/build/vm.scm
+++ b/gnu/build/vm.scm
@@ -367,6 +367,19 @@ Grub configuration and OS-DRV as the stuff in it."
"var=/tmp/root/var"
"run=/tmp/root/run"
"--"
+ ;; Store two copies of the headers.
+ ;; The resulting ISO-9660 image has a DOS MBR and
+ ;; one protective partition (with type 0xCD).
+ ;; Because GuixSD only uses actual partitions
+ ;; rather than what /proc/partitions returns, work
+ ;; around it by storing the primary volume
+ ;; descriptor twice, once where it should be and
+ ;; once in the partition.
+ ;; Allegedly, otherwise, many other GNU tools
+ ;; (automounters etc) would also be confused by
+ ;; the extra partition so it makes sense to
+ ;; store two copies in any case.
+ "-boot_image" "any" "partition_offset=16"
"-volid" ,(string-upcase volume-id)
,@(if volume-uuid
`("-volume_date" "uuid"