xorriso : FAILURE : Not a known command
scdbackup at gmx.net
Thu Jun 1 17:37:36 CEST 2017
i tested with the intermediate grub-mkrescue version of Debian 8.
$ grub-mkrescue --version
grub-mkrescue (GRUB) 2.02~beta2-22
Test case is to pack up the grub-mkrescue program as payload of a
bootable ISO. grub-mkrescue insists in some payload. One could as well
use some /tmp/dummy file instead of $(which grub-mkrescue).
One can see that it is neither the script nor the released binary,
because it fails without "--" before option -f :
$ grub-mkrescue --output=/dev/null $(which grub-mkrescue) -f
grub-mkrescue: invalid option -- 'f'
Try 'grub-mkrescue --help' or 'grub-mkrescue --usage' for more information.
$ echo $?
So the way to operate it is with "--":
$ grub-mkrescue --output=/dev/null $(which grub-mkrescue) -- -f
GNU xorriso 1.4.7 : RockRidge filesystem manipulator, libburnia project.
Written to medium : 4421 sectors at LBA 0
Writing to 'stdio:/dev/null' completed successfully.
$ echo $?
But the --help text describes the behavior of script and released binary:
$ grub-mkrescue --help
Generates a bootable CD/USB/floppy image. Arguments other than options to
this program are passed to xorriso, and indicate source files, source
directories, or any of the mkisofs options listed by the output of `xorriso
-as mkisofs -help'.
Option -- switches to native xorriso command mode.
The intermediate binary consumes the first "--" and thus does not let xorriso
switch to native command mode. The script and the released binary forward
all "--" arguments to xorriso, This causes the error message which Leslie
experiences, because -f is not a native xorriso command.
Given the pitfalls of program analysis, i deem above direct experiment
the most reliable way to determine the need for "--".
Have a nice day :)
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