Mksquashfs: add new -exit-on-error option
Mksquashfs recognises two kinds of error:
- Fatal errors which cause it to abort, and
- Non fatal errors which it considers can be safely ignored
These "non-fatal" errors are generally failure to read files or
directories, when this happens Mksquashfs skips or stores an empty
file and continues (flagging up what it has done to stderr).
From early feedback from users, this is generally considered a better
option than aborting. Often-times users are aware that there are files
which cannot be read by Mksquashfs, and want Mksquashfs to automatically
ignore them without having to explicitly exclude them on the command line
(for instance it may be known that there are files owned by other users).
Or for instance archiving a filesystem which is known to be partially
corrupted, and it is expected it will generate I/O errors on one or more
files (which are obviously unknown beforehand and cannot be explicitly
excluded). Additionally, often-times users do not know that there are
files which cannot be read, but would rather Mksquashfs flag these
errors and continue, rather than aborting what may be many hours of
compression.
But I have got feedback which shows in some use-cases this
behaviour is undesireable, and would rather Mksquashfs abort at
the failure to read any files.
So add a new option -exit-on-error which makes Mksquashfs abort on
these errors.
Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
5 files changed
