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New -as mkisofs option -appended_gpt_with_gaps

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Thomas Schmitt
2024-12-16 18:25:58 +01:00
parent 6deb2435ab
commit f8d09f39de
5 changed files with 165 additions and 59 deletions
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40
xorriso/xorrisofs.texi
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@ -50,7 +50,7 @@
@c man .\" First parameter, NAME, should be all caps
@c man .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
@c man .\" other parameters are allowed: see man(7), man(1)
@c man .TH XORRISOFS 1 "Version 1.5.7, Nov 01, 2024"
@c man .TH XORRISOFS 1 "Version 1.5.7, Nov 17, 2024"
@c man .\" Please adjust this date whenever revising the manpage.
@c man .\"
@c man .\" Some roff macros, for reference:
@ -1868,6 +1868,9 @@ of the cylinder size.
Beware of subsequent multi-session runs. The appended partition will get
overwritten.
@*
@cindex Appended partitions, MBR
With @strong{MBR}:
@*
partition_number may be 1 to 4. Number 1 will put the whole ISO image into
the unclaimed space before partition 1. So together with most xorriso MBR
or GPT features, number 2 would be the most natural choice.
@ -1890,6 +1893,23 @@ type "Apple_HFS", any other to "Data".
If some other command causes the production of GPT, then the appended
partitions will be mentioned there too, even if not -appended_part_as_gpt
is given.
@*
@cindex Appended partitions, GPT
@strong{GPT} can be forced by option -appended_part_as_gpt.
@*
partition_number may be 1 to 8. But other than with MBR partitions it is not
guaranteed that the resulting GPT partition will have this number, because
it might get occupied by a partition entry which fills a gap in the coverage
of the whole emerging image.
@*
The chance to get the desired partition number is increased much by
option -appended_gpt_with_gaps.
@*
The type_code may be the same as described with MBR. Given GUIDs are used
unchanged. Given MBR partition types get translated. 0xef becomes
C12A7328-F81F-11D2-BA4B-00A0C93EC93B, others become
EBD0A0A2-B9E5-4433-87C0-68B6B72699C7.
@*
@c man .TP
@item -appended_part_as_gpt
@kindex -appended_part_as_gpt Appended partitions in GPT
@ -1921,6 +1941,24 @@ parameter partition_number.
By default, appended partitions get marked in APM only if APM is produced
because of other options and -part_like_isohybrid is enabled.
@c man .TP
@item -appended_gpt_with_gaps
@kindex appended_gpt_with_gaps Sparsely filled GPT
@cindex GPT, sparsely filled, -appended_gpt_with_gaps
Possibly leave some parts of the resulting image unclaimed by partitions in
the emerging GPT in order to increase he chance to get in GPT the
partition numbers given with option -append_partition.
@*
The ISO 9660 filesystem gets marked by a GPT partition
only if none of the appended partitions has partition number 1,
and if no other command causes a partition inside the emerging ISO 9660
filesystem, and if -partition_offset is 16.
@*
If this option is not given, then gap filling partitions will be inserted
so that no part of the emerging image after block 16 is unclaimed by GPT
partitions. This happens only if partitions get appended and a valid GPT
emerges, e.g. by option -appended_part_as_gpt.
Commands which produce isohybrid-style invalid GPT disable gap filling.
@c man .TP
@item -efi-boot-part disk_path
@kindex -efi-boot-part EFI boot partition
@cindex Bootability, for EFI, -efi-boot-part