[Pkg-libburnia-devel] Bug#1022851: xorriso: -clone across sessions copies, not clones

[Thomas Schmitt]

Hi,

the miracle of staying or moving is decided by the alphabetic sequence
of imported original and freshly made clone.
This lets the files keep their old data storage address:
  -clone /hello/hello.world /hello/hello.z
This causes data storage in the new session:
  -clone /hello/hello.world /hello/hello.clone

By a shortcomming of the static function iso_tree_clone_file() in
libisofs/tree.c the cloned file is not marked as being imported from
the loaded ISO, as is its original. This mark is important for the
decision at image write time, whether a node can re-use its data storage
or needs data storage in the new session.

When the image production traverses the tree in alphabetic order it
meets "hello.clone" before "hello.world" and decides the storage need
of both by the missing import mark of "hello.clone".
When it encounters "hello.world" before "hello.z", then it decides that
no new storage is needed.

Please verify this behavior with your local experiment.

I plan to fix the bug in libisofs this evening.


Have a nice day :)

Thomas