Issue 2256: diff/whatsnew: Unexpected failure in updateIndex! when they perform no action - Darcs bug tracker

Title	diff/whatsnew: Unexpected failure in updateIndex! when they perform no action
Priority	bug	Status	needs-testcase
Milestone		Resolved in
Superseder		Nosy List	ganesh, owst
Assigned To		Topics	PatchIndex

Created on 2012-10-17.00:04:51 by owst, last changed 2013-02-16.13:48:35 by gh.

Messages
msg16242 (view)	Author: owst	Date: 2012-10-17.00:04:50
1. Summarise the issue (what were doing, what went wrong?) this is two apostrophes with nothing between them $ darcs diff '' darcs failed: Unexpected failure in updateIndex! 2. What behaviour were you expecting instead? No failure! 3. What darcs version are you using? (Try: darcs --exact-version) 2.9.5 4. What operating system are you running? Ubuntu X86_64
msg16379 (view)	Author: markstos	Date: 2012-11-21.20:38:06
I triggered the same issue with darcs 2.9.6, by running "darcs whatsnew" on a non-existent file path: $ darcs w /perllib/Role/REST/ Ignoring non-repository paths: /perllib/Role/REST/ Why would either of these operations trigger an index update anyway, since neither modifies data? That seems like a pessimization.
msg16510 (view)	Author: ganesh	Date: 2012-12-29.22:51:22
It's a bit of a tricky question, whether read-only commands should update caches like the [file] index and the patch index. I think they probably should, but they need to be tolerant of failure.
msg16616 (view)	Author: kowey	Date: 2013-02-16.08:26:39
Minimal test case please
msg16627 (view)	Author: gh	Date: 2013-02-16.13:48:34
This bug also happens in 2.8.4 (compiled with ghc 7.6) with both: darcs diff '' darcs w ''

History
Date	User	Action	Args
2012-10-17 00:04:51	owst	create
2012-10-17 00:05:02	owst	set	title: `darcs diff ''` from command line fails -> `darcs diff ''` fails
2012-11-21 20:38:08	markstos	set	topic: + PatchIndex messages: + msg16379 title: `darcs diff ''` fails -> darcs diff && darcs whatnews can fail with " Unexpected failure in updateIndex! " when they perform no action
2012-12-29 22:51:23	ganesh	set	nosy: + ganesh messages: + msg16510
2013-02-16 08:26:40	kowey	set	priority: bug status: unknown -> needs-testcase messages: + msg16616 title: darcs diff && darcs whatnews can fail with " Unexpected failure in updateIndex! " when they perform no action -> diff/whatsnew: Unexpected failure in updateIndex! when they perform no action
2013-02-16 13:48:35	gh	set	messages: + msg16627