[Bug 1832922] [NEW] cannot use growisofs to write iso image

[Hugo van der Sanden]

Public bug reported:

% lsb_release -rd
Description:    Ubuntu 18.04.2 LTS
Release:        18.04
% apt-cache policy dvd+rw-tools
dvd+rw-tools:
  Installed: 7.1-12
  Candidate: 7.1-12
  Version table:
 *** 7.1-12 500
        500 http://gb.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status
% 

The man page says:
  To use growisofs to write a pre-mastered ISO-image to a DVD:
      growisofs -dvd-compat -Z /dev/dvd=image.iso

So having downloaded the iso image I wanted, I ran:
  growisofs -speed=1 -dvd-compat -Z /dev/sr0=ubuntu-16.04.6-desktop-amd64.iso
expecting this to create a bootable Xenial installation DVD.

Instead it created a DVD which was not bootable; mounting it showed a single file "ubuntu_1.iso" clearly an 8.3-truncated version of the input filename. Along the way it showed what it was doing:
  genisoimage ubuntu-16.04.6-desktop-amd64.iso | builtin_dd of=/dev/sr0 obs=32k seek=0
.. so it looks like genisoimage is always getting called, and is creating a new iso image with the supplied iso as a simple file inside it.

As a workaround, I found that replacing genisoimage with a symlink to
/bin/cat allowed me to use the same growisofs invocation to create the
bootable DVD I wanted.

** Affects: dvd+rw-tools (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1832922

Title:
  cannot use growisofs to write iso image

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