From: "Thomas Schmitt" <scdbackup@gmx.net>
To: bug-xorriso@gnu.org
Cc: 33639@debbugs.gnu.org
Subject: bug#33639: ISO installer image is broken on i686
Date: Mon, 15 Apr 2019 19:55:07 +0200 [thread overview]
Message-ID: <1582867226375139246@scdbackup.webframe.org> (raw)
In-Reply-To: <20190415165451.dpzngealeisbibc7@pelzflorian.localdomain>
Hi,
Florian Pelz wrote:
> Well this is strange. I got fine ISO images each time (fine with no
> complaints from xorriso or fdisk and bootable in QEMU without errors),
> but after dd’ing them to different USB flash drives each time I get
> kernel output when inserting the flash drive:
> [ 10.025223] GPT:Primary header thinks Alt. header is not at the end of
> the disk.
The alternative/backup header is a property of GPT which makes it
rather unsuitable for disk images. xorriso puts it correctly into the
last 512-byte block of the image. But when copied to a storage device,
it should move up to the last block of the device.
Even worse, the main GPT header at 512-byte LBA 1 needs to learn the
new address.
So i would rather advise to use a MBR partition table. Wonderfully dumb
and open ended.
I see from
http://git.savannah.gnu.org/cgit/guix.git/tree/gnu/build/vm.scm#n462
that program grub-mkrescue is in control of xorrisofs boot options.
Vladimir Serbinenko decided for GPT with no mountable ISO partition.
The libisoburn repo and tarball have a wrapper script by which other
boot layouts can be derived from the options which grub-mkrescue hands
over to xorrisofs:
https://dev.lovelyhq.com/libburnia/libisoburn/raw/master/frontend/grub-mkrescue-sed.sh
To get MBR instead of GPT do:
export MKRESCUE_SED_MODE=mbr_only
export MKRESCUE_SED_PROTECTIVE=""
and maybe
export MKRESCUE_SED_XORRISO=/...path/to/the/xorriso/binary/if/exotic...
Then start grub-mkrescue with the wrapper in the role of "xorriso":
grub-mkrescue --xorriso=...path/to/grub-mkrescue-sed.sh \
-partition_offset 16 \
-iso_mbr_part_type 0x83 \
\
...all.other.usual.arguments...
The mode "mbr_only" will move the EFI partition image out of the ISO
filesystem and rather append it after the ISO's end.
The option
-partition_offset 16
costs the space of a second superblock and directory tree. But it brings
as benefits:
- More normal partition layout with partition 1 starting at block 64
rather than at block 0.
- Nevertheless the partition 1 is mountable and shows the ISO content.
- The base device is mountable as the the same ISO too.
(The ISO superblock of the base device also serves on CD or DVD.)
- Th base device superblock claims not only the ISO in partition 1 but
also the EFI partition 2. So "/sbin/isosize" will tell the size of the
image file, not only of the ISO filesystem.
Option
-iso_mbr_part_type 0x83
chooses for partition 1 the MBR partitions type "Linux". (This is
purely ornamental. Nobody cares. But it looks good in partition editors.)
The partition layout of above wrapper run's output ISO will look like:
$ /sbin/fdisk -l output.iso
Disk output.iso: 16.5 MiB, 17338368 bytes, 33864 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000
Device Boot Start End Sectors Size Id Type
output.iso1 * 64 28103 28040 13.7M 83 Linux
output.iso2 28104 33863 5760 2.8M ef EFI (FAT-12/16/32)
$ expr $(/sbin/isosize output.iso) / 512
33864
Have a nice day :)
Thomas
next prev parent reply other threads:[~2019-04-15 17:54 UTC|newest]
Thread overview: 128+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-06 0:02 bug#33639: ISO installer image is broken on i686 Ludovic Courtès
2018-12-06 7:19 ` Ludovic Courtès
2018-12-06 10:34 ` Ludovic Courtès
2018-12-06 14:08 ` Thomas Schmitt
2018-12-06 15:34 ` Ludovic Courtès
2018-12-06 16:59 ` Thomas Schmitt
2018-12-15 18:40 ` Thomas Schmitt
2018-12-15 19:24 ` Thomas Schmitt
2018-12-16 15:52 ` Ludovic Courtès
2018-12-16 16:52 ` Thomas Schmitt
2018-12-18 11:16 ` Ludovic Courtès
2018-12-18 21:45 ` Thomas Schmitt
2018-12-19 14:05 ` Ludovic Courtès
2018-12-19 14:51 ` Thomas Schmitt
2018-12-20 13:38 ` Thomas Schmitt
2018-12-21 20:44 ` Ludovic Courtès
2018-12-21 21:42 ` Thomas Schmitt
2019-04-07 20:18 ` pelzflorian (Florian Pelz)
2019-04-07 21:35 ` Thomas Schmitt
2019-04-08 8:50 ` Ludovic Courtès
2019-04-09 22:13 ` pelzflorian (Florian Pelz)
2019-04-10 11:17 ` Thomas Schmitt
2019-04-10 21:23 ` pelzflorian (Florian Pelz)
2019-04-12 21:26 ` Ludovic Courtès
2019-04-13 6:37 ` Thomas Schmitt
2019-04-13 13:46 ` pelzflorian (Florian Pelz)
2019-04-13 16:20 ` Thomas Schmitt
2019-04-14 21:43 ` Ludovic Courtès
2019-04-15 6:07 ` pelzflorian (Florian Pelz)
2019-04-15 8:16 ` Thomas Schmitt
2019-04-15 8:35 ` Thomas Schmitt
2019-04-19 11:40 ` bug#35283: ISO images are not reproducible Ludovic Courtès
2019-04-19 12:46 ` Thomas Schmitt
2019-04-20 22:57 ` Ludovic Courtès
2019-04-21 8:17 ` Thomas Schmitt
2019-04-21 16:42 ` Ludovic Courtès
2019-04-21 18:44 ` Thomas Schmitt
2019-04-20 23:03 ` bug#35283: [PATCH] mformat: initialize boot sector before writing it Ludovic Courtès
2019-04-21 16:32 ` bug#35283: [PATCH] grub-mkrescue: Allow users to specify a FAT serial number Ludovic Courtès
2019-04-14 15:47 ` bug#33639: ISO installer image is broken on i686 Ludovic Courtès
2019-04-15 16:54 ` pelzflorian (Florian Pelz)
2019-04-15 17:55 ` Thomas Schmitt [this message]
2019-04-16 9:57 ` Gábor Boskovits
2019-04-16 13:40 ` ISO installer image: GPT versus MBR partitions (was bug#33639) Thomas Schmitt
2019-04-16 16:32 ` pelzflorian (Florian Pelz)
2019-04-16 17:57 ` ISO installer image: GPT versus MBR partitions Thomas Schmitt
2019-04-16 19:55 ` pelzflorian (Florian Pelz)
2019-04-16 20:31 ` pelzflorian (Florian Pelz)
2019-04-16 21:15 ` Thomas Schmitt
2019-04-17 8:59 ` pelzflorian (Florian Pelz)
2019-04-17 10:23 ` Thomas Schmitt
2019-04-17 10:30 ` pelzflorian (Florian Pelz)
2019-04-17 15:51 ` Thomas Schmitt
2019-04-17 22:35 ` pelzflorian (Florian Pelz)
2019-04-18 6:32 ` Thomas Schmitt
2019-04-18 7:00 ` Thomas Schmitt
2019-04-18 7:07 ` pelzflorian (Florian Pelz)
2019-04-18 8:13 ` Thomas Schmitt
2019-04-18 12:19 ` pelzflorian (Florian Pelz)
2019-04-18 13:50 ` Thomas Schmitt
2019-04-18 21:28 ` Thomas Schmitt
2019-04-19 7:29 ` pelzflorian (Florian Pelz)
2019-04-19 8:03 ` pelzflorian (Florian Pelz)
2019-04-19 9:01 ` Thomas Schmitt
2019-04-19 9:39 ` pelzflorian (Florian Pelz)
2019-04-19 10:58 ` Thomas Schmitt
2019-04-19 14:57 ` pelzflorian (Florian Pelz)
2019-04-19 11:30 ` pelzflorian (Florian Pelz)
2019-04-19 18:33 ` pelzflorian (Florian Pelz)
2019-04-19 19:23 ` Thomas Schmitt
2019-04-20 10:26 ` pelzflorian (Florian Pelz)
2019-04-20 10:50 ` Thomas Schmitt
2019-04-20 11:16 ` Thomas Schmitt
2019-04-20 11:29 ` Thomas Schmitt
2019-04-20 14:23 ` Thomas Schmitt
2019-04-20 14:54 ` pelzflorian (Florian Pelz)
2019-04-20 15:17 ` pelzflorian (Florian Pelz)
2019-04-20 15:33 ` pelzflorian (Florian Pelz)
2019-04-20 16:32 ` Thomas Schmitt
2019-04-21 7:58 ` pelzflorian (Florian Pelz)
2019-04-21 9:35 ` Thomas Schmitt
2019-04-21 11:10 ` pelzflorian (Florian Pelz)
2019-04-21 11:16 ` Thomas Schmitt
2019-04-21 11:56 ` pelzflorian (Florian Pelz)
2019-04-21 12:27 ` Thomas Schmitt
2019-04-21 14:11 ` pelzflorian (Florian Pelz)
2019-04-21 14:36 ` Thomas Schmitt
2019-04-22 13:11 ` Thomas Schmitt
2019-04-23 16:40 ` pelzflorian (Florian Pelz)
2019-04-23 17:23 ` Thomas Schmitt
2019-04-17 12:24 ` Ludovic Courtès
2019-04-17 13:42 ` pelzflorian (Florian Pelz)
2019-04-23 18:14 ` Thomas Schmitt
2019-04-23 19:50 ` pelzflorian (Florian Pelz)
2019-04-23 20:18 ` Thomas Schmitt
2019-04-23 21:43 ` pelzflorian (Florian Pelz)
2019-04-24 6:56 ` Thomas Schmitt
2019-04-24 9:13 ` pelzflorian (Florian Pelz)
2019-04-24 10:34 ` Thomas Schmitt
2019-04-24 22:13 ` Danny Milosavljevic
2019-04-25 7:07 ` Thomas Schmitt
2019-04-25 9:45 ` pelzflorian (Florian Pelz)
2019-04-25 13:44 ` Thomas Schmitt
2019-04-25 14:59 ` Danny Milosavljevic
2019-04-25 16:22 ` Thomas Schmitt
2019-04-25 17:55 ` Danny Milosavljevic
2019-04-25 18:46 ` Thomas Schmitt
2019-04-25 19:01 ` Danny Milosavljevic
2019-04-25 16:34 ` Ludovic Courtès
2019-04-26 11:34 ` pelzflorian (Florian Pelz)
2019-04-26 14:41 ` Ludovic Courtès
2019-04-26 15:30 ` pelzflorian (Florian Pelz)
2019-04-26 13:57 ` Thomas Schmitt
2019-04-27 13:20 ` Ludovic Courtès
2019-04-27 16:24 ` Thomas Schmitt
2019-04-28 12:53 ` Ludovic Courtès
2019-04-25 11:49 ` pelzflorian (Florian Pelz)
2019-04-25 15:09 ` Thomas Schmitt
2019-04-25 15:58 ` pelzflorian (Florian Pelz)
2019-04-25 16:40 ` Thomas Schmitt
2019-04-16 9:57 ` bug#33639: ISO installer image is broken on i686 Gábor Boskovits
2019-04-16 21:01 ` Ludovic Courtès
2019-04-17 9:03 ` pelzflorian (Florian Pelz)
2018-12-06 16:28 ` Ludovic Courtès
2018-12-06 17:29 ` Thomas Schmitt
2018-12-07 22:51 ` Ludovic Courtès
2018-12-08 12:42 ` Thomas Schmitt
2018-12-06 9:35 ` swedebugia
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