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RE: Re: [DESIGN] mtime versioning - was: Getting Bug 1256 fixed

From: Thompson, Graeme (AELE) <Graeme.Thompson_at_smiths-aerospace.com>
Date: 2005-11-28 16:23:32 CET

My expectations of the logical working of this feature are:

Import and checkin:

  Configuration:
    Global:
       - Option to store the modified datetime for all files. On =
stores datetimes.
         Default: on (See requirements 3)

    Per file:
       - The ability to set a flag to say to store the modification
datetime.
         Default: Not set

  Change Checking:

  - The modification datetime will not be used to determine is a file
has changed. This will be done using a binary compare (as is currently
the case)

  Storage:

  - The modified timestamp for the file will be stored for every
revision of a file. i.e. it will be stored whenever a file delta is
stored.

Export and checkout:

  Configuration:
    - 4 options available to the client for the setting of the
modification datetime:
      1) Use the current datetime
      2) Use the checkin datetime
      3) Use the original file datetime. If this was not stored in the
repository then the current time should be used (this can then be used
by the user to know that there was no modification datetime available)
      4) Use the original datetime for all files that have the per file
storage flag set. To allow for the people who want the docs with their
original modification datetime but the source with the current datetime.

   
Summary:

I believe that this covers all of the various use cases for this feature
which are:

1) Using it on specific non source files, but keeping compatibility with
make for source files.
2) Using it for every file for compatibility with company procedures
that use the modified datetime to specify a file.
3) Not using it at all.

Requirements:

1) Maintain compatibility with the existing system.
2) Do not change the default behaviour of the system as there are a lot
of people out there that have expectations of the system.
3) Enable the novice to set up the system and to then have this option
available in the future. It would be highly frustrating to have worked
on a system and then want to get the modified datetimes only to find out
that you did not set an option that you didn't know that you had to.
Advanced users that do not want this feature can turn it off to save
storage space and processing time.
4) Allow the client to choose how they want to get their files out.

I hope that this is clear, I feel that this is an issue where subversion
should simply provide the functionality to satisfy these use cases and
would thus allow for people who want to work in whatever way that they
want and for their own reasons. I personally see the benefits of working
with the current time for compatibility with make, but at the same time
I prefer to work with the original modification datetimes and then use
make -B whenever I do an update. It may take a little longer but it
gives the same safe end result. This modification will enable everyone
to work the way that they are happiest.

Thanks,

Graeme

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Received on Mon Nov 28 16:40:23 2005

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