Re: xorriso (& genisoimage) missing various eltorito options.

Hi,

B.S. wrote:
> In the mean time, being on Debian myself, probably not?

You could volunteer to try the newest GNU xorriso snapshot.

I read the man page of contemporary mkisofs
  http://cdrtools.sourceforge.net/private/man/cdrecord/mkisofs.8.html
and implemented in xorriso's mkisofs emulation:

  -eltorito-platform "x86"|"PPC"|"Mac"|"efi"|0xnn|nnn
      Set   the   Platform  Id  number  for  the  next  option  -b  or
      -eltorito-boot.  The number may be chosen by a platform name  or
      by  a number between 0 and 255 (0x00 and 0xFF). "x86" = 0 is for
      PC-BIOS, "PPC" = 1 for some PowerPC systems, "Mac" = 2 for  some
      MacIntosh  systems,  "efi" = 0xEF for EFI on modern PCs with x86
      compatible CPUs or others.
      If  the  new  platform  id  differs  from  the   previous   one,
      -eltorito-alt-boot is performed.

There may still be subtle differences between this and the behavior of
mkisofs. (But i lowered myself to make -eltorito-alt-boot conditional. :))

A test with

  xorriso -as mkisofs -o test.iso \
      -b bios_image -no-emul-boot -boot-load-size 4 -boot-info-table \
      -eltorito-alt-boot \
      -eltorito-platform 0xEF -eltorito-boot efi_image -no-emul-boot \
      images_directory

yields an ISO about which 

  xorriso -indev test.iso -report_el_torito plain

reports

  El Torito images   :   N  Pltf  B   Emul  Ld_seg  Hdpt  Ldsiz         LBA
  El Torito boot img :   1  BIOS  y   none  0x0000  0x00      4        3937
  El Torito boot img :   2  UEFI  y   none  0x0000  0x00  15612          34
  El Torito img path :   1  /bios_image
  El Torito img opts :   1  boot-info-table
  El Torito img path :   2  /efi_image

-------------------------------------------------------------------

GNU xorriso is a static compilation of the same source which Debian
has as 4 libraries and a small binary. Other than the libraries it
exists not only as release versions but also as development snapshot.

To get the current development snapshot do

  mkdir "$HOME"/xorriso_dir
  cd "$HOME"/xorriso_dir
  wget http://www.gnu.org/software/xorriso/xorriso-1.4.7.tar.gz
  tar xzf xorriso-1.4.7.tar.gz
  cd xorriso-1.4.7
  ./configure && make

This needs the tools from Debian meta-package "build-essential":
gcc, ld, "make", ...
(The MD5 of the current tarball is 46e10e669732d47151fa42a71500bfbf.
 In a few days, there may be a new upload with different MD5, though.)

After above commands there should be a binary which can tell its version

  $ ./xorriso/xorriso -version
  GNU xorriso 1.4.7 : RockRidge filesystem manipulator, libburnia project.
  ...
  xorriso version   :  1.4.7
  Version timestamp :  2017.06.03.163742
  ...

Next replace the little Debian xorriso binary by the large GNU xorriso:

  xorriso="$(which xorriso)"
  sudo mv "$xorriso" "$xorriso"-debian
  sudo cp xorriso/xorriso "$xorriso"

Verify that you now have GNU xorriso in the command PATH

  xorriso -version

and then try whether it brings better results with Mondo Rescue.


Have a nice day :)

Thomas


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