debcrafters-packages team mailing list archive

[Simon Chopin <2129995@xxxxxxxxxxxxxxxxxx>]

The /dev/shm part of the problem is a xorriso limitation, as explained
by the following lines in the output:

xorriso : FAILURE : Drive address '/dev/shm/lubuntu-25.10-desktop-amd64.iso' rejected because: not MMC and -drive_class 'caution' '/dev'
xorriso : HINT : If the address is a legitimate target, prepend "stdio:"
xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'

IMHO the benefit of this safety outweighs the rather niche shm use case,
especially since it can be trivially circumvented by creating a symlink
to /dev/shm in another location, e.g. /tmp/shm, but you're welcome to
provide a patch implementing a CLI flag to bypass the xorriso safety
mechanism.

** Changed in: usb-creator (Ubuntu)
   Importance: Undecided => Wishlist

** Tags added: dcr-freezer

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https://bugs.launchpad.net/bugs/2129995

Title:
  usb-creator-kde does not accept an input iso on /dev/shm

Status in usb-creator package in Ubuntu:
  New

Bug description:
  system: lubuntu 25.04  (updated)
  usb-creator-kde/plucky,plucky,now 0.4.1 all [installed]

  (1) Does not accept an input iso if it is on /dev/shm

  sudo bash
  /home/dakra#usb-creator-kde 	 -i/dev/shm/lubuntu-25.10-desktop-amd64.iso
  qt.svg: QSvgHandler: Image filename is empty
  qt.svg: /usr/share/icons/hicolor/scalable/apps/usb-creator-kde.svg:1584:45: Could not resolve property: #linearGradient5167
  xorriso 1.5.6 : RockRidge filesystem manipulator, libburnia project.

  xorriso : FAILURE : Drive address '/dev/shm/lubuntu-25.10-desktop-amd64.iso' rejected because: not MMC and -drive_class 'caution' '/dev'
  xorriso : HINT : If the address is a legitimate target, prepend "stdio:"
  xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'
  xorriso 1.5.6 : RockRidge filesystem manipulator, libburnia project.

  xorriso : FAILURE : Drive address '/dev/shm/lubuntu-25.10-desktop-amd64.iso' rejected because: not MMC and -drive_class 'caution' '/dev'
  xorriso : HINT : If the address is a legitimate target, prepend "stdio:"
  xorriso : aborting : -abort_on 'FAILURE' encountered 'FAILURE'

  (2a) Does not accept an input iso if it is on /dev/shm, even after
  following the error message's advice

  root@Legion5i:/home/dakra# usb-creator-kde -i stdio:/dev/shm/lubuntu-25.10-desktop-amd64.iso
  qt.svg: QSvgHandler: Image filename is empty
  qt.svg: /usr/share/icons/hicolor/scalable/apps/usb-creator-kde.svg:1584:45: Could not resolve property: #linearGradient5167

  (2b) same when the command is
  usb-creator-kde -i stdio: </dev/shm/lubuntu-25.10-desktop-amd64.iso

  (3) Does succeed when the input comes from a copy of the file in the
  home directory

  usb-creator-kde -i/home/dakra/lubuntu-25.10-desktop-amd64.iso
  qt.svg: QSvgHandler: Image filename is empty
  qt.svg: /usr/share/icons/hicolor/scalable/apps/usb-creator-kde.svg:1584:45: Could not resolve property: #linearGradient5167
  xorriso 1.5.6 : RockRidge filesystem manipulator, libburnia project.

  xorriso : NOTE : Loading ISO image tree from LBA 0
  xorriso : UPDATE :     768 nodes read in 1 seconds
  libisofs: NOTE : Found hidden El-Torito image for EFI.
  libisofs: NOTE : EFI image start and size: 1685510 * 2048 , 10256 * 512
  xorriso : NOTE : Detected El-Torito boot information which currently is set to be discarded
  Drive current: -dev '/home/dakra/lubuntu-25.10-desktop-amd64.iso'
  Drive access : shared:readonly
  Media current: stdio file, overwriteable
  Media status : is written , is appendable
  Boot record  : El Torito , MBR protective-msdos-label grub2-mbr cyl-align-off GPT
  Media summary: 1 session, 1688240 data blocks, 3297m data,  152g free
  Volume id    : 'Lubuntu 25.10 amd64'
  xorriso : UPDATE :       1 files restored (    58b) in 1 seconds = 0.0xD
  Extracted from ISO image: file '/.disk/info'='/tmp/tmp9jlyftp_'

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