id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	launchpad_bug
1234	UnrecoverableFileError message should say which file it refers to	davidsarah		"zooko on irc:

> sigh, I am experiencing failure using the pub test grid :-/

> My top-level directory contains some subdir or subdir of subdir which is unrecoverable.

> Therefore, as far as I know, the Tahoe-LAFS UIs provide almost no way to proceed.

> I can't deep-repair, I can't cp -r to recover the recoverable stuff.

> Maybe I can deep-check to learn which one is unrecoverable ...

ticket:755#comment:4 mentions this problem, but that ticket is mainly about having deep-check continue on error. Giving information about which file is unrecoverable (the cap, and the filename if known) would be useful in more circumstances than just deep-check.

Note that because of #625, we need a write cap to repair mutable files/directories. Otherwise I would suggest diminishing the cap in the message to a read or verify cap (since the error message channel might be more vulnerable to cap leakage). As it is, the user needs the write cap, at least for mutable objects.
"	defect	new	major	1.9.0	code-frontend-web	1.8.0		error usability capleak