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Re: More case insensitivity issues

From: Derek Robert Price
Subject: Re: More case insensitivity issues
Date: Tue, 21 Oct 2003 09:21:32 -0400
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Okay.  Solution #2 it is, to be implemented shortly on stable.  Speak
now or forever hold your peace if you have objections.


Derek Robert Price wrote:

| Incidentally, the other side effect of this problem is that *info
| scripts running on case sensitive servers are currently passed
| incorrectly the names of new added files.  Even though file1 might be
| resurrected by a command from a case insensitive client, for example,
| loginfo could be passed FILE1 as the filename of the new file.
| Either of the solutions below would fix this.  Solution 2 by virtue of
| making the current "incorrect" name being passed to loginfo the correct
| one without altering it and solution 1, presumably, by correcting the
| name in the internal CVS data structures when it was determined that
| corrective commands needed to be sent ot the client and before it got
| passed to loginfo.
| I'm starting to think I actually prefer solution 2.  It is much more
| elegant.  Any of the consistency buffs out there want to argue with me?
| Derek
| Derek Robert Price wrote:
| | Fixing the assertion failure and repository corruption on an attempted
| | recase (remove of file1; add of FILE1) from a case insensitive
| | filesystem exposed another bug:
| |
| | The add now finds the previous version of the file, despite the
| | different case, and resurrects it.  This is as intended.  It is parallel
| | to the operation of all of the other CVS commands when run from a case
| | insensitive client - it first looks for a file cased as specified and if
| | one cannot be found it then finds any file spelled correctly in a
| | different case.
| |
| | The problem is that, on a subsequent update, the case of the entry in
| | the CVS/Entries file on the client no longer matches the case of the
| | file on the server, which still has the original case.  This causes
| | "move FILE1 - it is in the way" errors from the client on updates from
| | the server of "file1".  This is certainly not desirable.
| |
| | I've been thinking about this problem, and I've come up with two
| | possible solutions:
| |
| | One solution is to keep most of the behavior the way it is, which
| | disallows a recase from Windows and other case insensitive clients, but
| | send commands on commit of an add to correct the case of the file on the
| | client and avoid the "in the way" errors.  I like this solution best,
| | since it maintains the behavior parallel to the rest of the CVS commands
| | in regards to looking up file requests from case insensitive clients,
| | finding differently cased files and assuming that resurrecting those
| | files was the intended result.  I think this solution will take a little
| | longer to implement,
| | however, on the order of a week or two of total dev time.
| |
| | The second solution is to assume that a user performing a `cvs add' from
| | a CVS client knows what they are doing when they request a different
| | case from any file in the repository and allow the recase, causing an
| | add of the new file with the new case.  This fix would enable the most
| | functionality, but users on case insensitive file systems might be
| | surprised by the change in the way the server does file lookups compared
| | to the other CVS commands.  This fix might or might not require less
| | work.  Something similar to this was happening before the assertion
| | error fix - the first lookup created a new file and a second case
| | insensitive lookup determined that there was case ambiguity and an
| | assertion failed.  I'm sure I could find an alternative way to work
| | around this issue, but I'm not sure how long that will take.
| |
| | I suppose that an argument could be made that assuming the user was
| | requesting the case they desired in solution two was actually the same
| | behavior expected of the other commands in the case of an add - since a
| | file name in any case can be created, any requested case "matches"
| | literally during an add.  We don't care during the matching phase
| | whether the "match" happens to cause a create or a resurrection.
| |
| | Either solution is likely to upset some users.  I was hoping to get a
| | good feel for how many were on each side of the issue by asking info-cvs
| | & bug-cvs and maybe even elicit definitive arguments as to why one
| | solution should be preferable to the other.
| |
| | Derek

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