[LTP] [PATCH] save_restore: Check whether path is writable

[Petr Vorel]

> Hi!
> > > For optional path, if test can't read/write it (b/o of no root privileges),
> > > I think library shouldn't try to save it - then that would also skip
> > > attempt to restore it.

> > There are be two different kinds of optional paths, though:
> > 1) paths that sometimes don't exist but must be written to if they do
> > 2) paths that may be left alone if they exist and already contain the 
> > right value (otherwise TCONF)

> Alternatively we can cleanup the interface, we moved from a single
> string to a structure so we can add more fields, what about adding flags
> that would describe one single attribute of the file instead of
> clobbering several different characteristics of the file into a single
> character?

> We can then do something as:

> struct tst_save_restore {
> 	const char *path;
> 	const char *val;
> 	/* the test needs the file to exist -> TCONF on missing */
> 	int required:1;
> 	/* write the value even if the file already contains it */
> 	int rewrite:1;
> 	...
> };

> This makes the inteface orthogonal and much easier to reason about.

Sounds reasonable approach to me.
Martin, Jan, WDYT?

Kind regards,
Petr