591703 - local change (on old data) overrides all server changes

Status: RESOLVED WONTFIX

(Calendar :: Provider: ICS/WebDAV, defect)

Description

[Sven Strickroth]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.2.8) Gecko/20100802 Lightning/1.0b3pre Thunderbird/3.1.2

If I create a new calender which consists of an ics-file on a server might get overridden with old data on change.

Reproducible: Always

Steps to Reproduce:
1. Create calendar in lightning which resides on a server
2. create an event a on client 1
3. modify/replace ics file on server (e.g. edit it from some other device/client 2 by adding another event b) - the ics file on the server contains event a and b.
4. delete the just added event a on client 1 (w/o updating the calendar before)
4a (client 1 downloads the ics file using get-method (client 1 ignores the results of the get-reuqest) and immediately puts the updated ics (based on client 1 local data) file to the server.)
Actual Results:  
event b which was added on client 2 is lost - calendar on server is empty.

Expected Results:  
Client 1 downloads the ics file, merges it with the requested change and uploads the merged file which contains all events, but not the event a which was requested for deletion.

Comment 1

[Stefan Sitter [:ssitter]]

From http://www.mozilla.org/projects/calendar/releases/lightning1.0b2.html#issues "Concurrent editing of remote calendars by multiple users can lose data."

Comment 3

[Wayne Mery (:wsmwk)]

This bug is still unconfirmed. So is this a permanent limitation, invalid bug, valid bug, ...?

Comment 4

[Wayne Mery (:wsmwk)]

(In reply to Wayne Mery (:wsmwk, NI for questions) from comment #3)
> This bug is still unconfirmed. So is this a permanent limitation, invalid
> bug, valid bug, ...?

Comment 5

[[:MakeMyDay]]

This is a limitation by design - control of ics calendars changes are on file level (regardless whether it's the file is located on a web or a file server). If you want a more fine graned control on item level including a conflict handling, you use a caldav server, which is designed for that very purpose.

The use case for an ICS calendars is typically a pusblished calendar, which is only controlled by a single maintainer.