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Re: grub-mkrescue fails with HFS+ error possibly due to directory size

From: Thomas Schmitt
Subject: Re: grub-mkrescue fails with HFS+ error possibly due to directory size
Date: Sat, 25 Jul 2020 10:38:34 +0200


what shall be done about the failure of grub-mkrescue for I386_EFI,
X86_64_EFI, and POWERPC_IEEE1275 with very large input file trees ?

libisofs now emits a better error message
  Too many files in HFS+ directory tree
instead of
  Too much files to mangle, cannot guarantee unique file names
man xorrisofs now says:
  The  HFS+  implementation in libisofs has a limit of 125,829,120
  bytes for the size of the overall directory tree. This  suffices
  for about 300,000 files of normal name length. If the limit gets
  exceeded, a FAILURE event will be issued and the ISO  production
  will not happen.

But a solution of the problem itself is out of my reach.

Possible ways to go:

- Enhance libisofs to create "HFS+ map nodes" for more tree storage.
  (Would need help from Vladimir Serbinenko and substantial testing.)

- Disable -hfsplus in grub-mkrescue by default and have a new option to
  enable it for the antique Macs which need it.
  (It would be not enough for the user to just add xorrisofs option
   -hfsplus. Needed are the options pushed at
   up to line 731.)

- Document the problem for grub-mkrescue and add a new option of
  grub-mkrescue which suppresses xorrisofs option -hfsplus.

- Document for grub-mkrescue the existing workaround of adding as last
  arguments these three:
    -- -hfsplus off
  (Problem is that xorriso -as mkisofs cannot disable -hfsplus once it
   was given. But xorriso as itself can. "--" ends mkisofs emulation.)

Have a nice day :)


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