[Pkg-opt-media-team] Bug#1110383: File names over 85 characters crash growisofs -r -M

[Thomas Schmitt]

Hi,

this looks more like a problem of genisoimage than of growisofs.
Regrettably both are unmaintained in Debian and upstream.

Do you get better results if you use xorrisofs instead of genisoimage ?

If not yet installed, get xorriso by:

  sudo apt install xorriso

Use its mkisofs emulation named "xorrisofs" with growisofs by

  export GENISOIMAGE=xorrisofs
  growisofs -r -M /dev/sr1 test_dir

It might be that xorrisofs throws an error on the existing genisoimage
generated filesystem. So it might be necessary to start a new sequence
of ISO 9660 sessions by growisofs -Z.

Alternatively you could use xorriso in its native command mode which
does the burning, too.
The equivalent of growisofs -Z is done by command -outdev and
command -blank with mode "as_needed", which will do nothing if the
medium is already blank:

  xorriso -outdev /dev/sr1 -blank as_needed -map test_dir / -find / -exec mkisofs_r --

The equivalent of growisofs -M is done by -dev and without -blank:

  xorriso -dev /dev/sr1 -map test_dir / -find / -exec mkisofs_r --

You may use for testing a data file instead of /dev/sr1. It will behave
like a DVD+RW medium in a drive. E.g. with "$HOME"/test.iso :

  xorriso -outdev "$HOME"/test.iso ...
  xorriso -dev "$HOME"/test.iso ...

The parent directory of the file has to exist already.

Note that the sequence of xorriso commands matters:
First acquire the drive, then blank it, then put files into the
emerging ISO filesystem by -map, then manipulate them by -find.
The final write command -commit can be omitted, because xorriso writes
the session at program end if changes to its model of the ISO
filesystem are pending.

I am the developer of xorriso. So i am biased, of course.

Be aware that Linux misrepresents Rock Ridge file names which are
longer than 253 bytes. Length 254 and 255 should be supported
but aren't. The truncation of names > 253 bytes is coarse and can
discard more than 100 bytes from the file name's end.


Have a nice day :)

Thomas