[Bug 2038694] Re: Now that exfat filesystem is in the kernel, allow using it for storing isos loopback booting and storing the persistence file

[Adrian Feliks]

@Adam Vodopjan (grozzly)

You're absolutely right. Currently, booting from exFAT doesn't work because there's no module for it, neither built-in nor located in early3/usr/lib/modules/6.8.0-11-generic/kernel/fs.
The command `manual_add_modules exfat` (patch @Glenn Washburn) adds exfat module to the initrd during livecd creation.

See: https://git.launchpad.net/ubuntu/+source/casper/tree/hooks/casper

Ubuntu 24.04 is coming soon...

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https://bugs.launchpad.net/bugs/2038694

Title:
  Now that exfat filesystem is in the kernel, allow using it for storing
  isos loopback booting and storing the persistence file

Status in casper package in Ubuntu:
  Confirmed

Bug description:
  Recent Ubuntu Desktop livecd isos are greater than 4G and have been
  growing at an alarming rate (22.04.1 is 3.6G and 22.04.2 is 4.6G, but
  that's another story). The fat32 filesystem allows a maximum of 4G
  file size, so newer isos can not be stored on fat32. Currently the
  only non-journalled filesystem and only file system with easy
  interoperability with Windows is fat32. Neither NTFS nor EXFAT are
  supported by casper. EXFAT would be good to support so that a windows
  user can write a greater than 4G iso file from Windows to use for
  loopback booting. And likewise allow the persistence file to be on
  EXFAT, so that another filesystem is not needed just to store the
  persistence file.

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