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[bug #21023] Possible commit problem


From: anonymous
Subject: [bug #21023] Possible commit problem
Date: Mon, 10 Sep 2007 23:23:10 +0000
User-agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727)

URL:
  <http://savannah.nongnu.org/bugs/?21023>

                 Summary: Possible commit problem
                 Project: Concurrent Versions System
            Submitted by: None
            Submitted on: Monday 09/10/2007 at 23:23 UTC
                Category: Bug Report
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
           Fixed Release: None
   Fixed Feature Release: None

    _______________________________________________________

Details:

At our work we use the pserver access method to interact with the CVS
repository.  We had an instance where a user had issued a commit and prior to
the commit completing they made a last minute change to the file.  A
subsequent “cvs status” showed the file to be up to date so the user
concluded that their change was included in the repository revision; however,
that was not the case.

While tracing the client we found, shall I call it a “window of
opportunity”, which we believe was the possible cause of the incorrect
situation.  To illustrate this, let’s take the following scenario:

1)      User issues commit
2)      send_modified in client.c sends the file --- (file has a timestamp of
yesterday)
3)      Prior to the commit completing (possibly due to a repository lock on the
server) the file is modified in the client’s work area by another process
(file now has a timestamp of today).
4)      The server then talks back and the client gets a “Checked-in”
response
5)      The client then eventually calls update_entries who reads the new 
revision
from the server and gets the files timestamp (todays) for the file in the work
area and copies that to local_timestamp.
6)      Register is then called passing local_timestamp (todays – not
yesterdays).
7)      Register creates a new entnode with todays (incorrect) timestamp and
eventually returns to update_entries.
8)      update_entries returns to call_in_directory who then calls Entries_Close
to write out the entries file.

The CVS/Entries file now has the revision that matches what is in the
repository; however, the entries timestamp does not reflect the files
timestamp that existed for the file when it was actually committed. 
Consequently, a status, diff, etc will say that the file is up to date.

Let me state also that we are back-leveled a bit (1.11.14).  Can someone
please let me know if this doesn’t seem to be a problem in the current 1.11
branch?  Also, if it is a problem in the current 1.11 branch then please let
me know that also.  I can be reached at either of the email addresses below.

Thanks for your assistance,
John Elgin      
address@hidden
address@hidden




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