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Re: rebase keeps last modification time of DLL unchanged

On Mar  8 21:37, Christian Franke wrote:
> Corinna Vinschen wrote:
> >On Mar  7 23:07, Christian Franke wrote:
> >>The rebase tool does not change last modification timestamp of each
> >>DLL even if its data has changed. This is likely because Windows
> >>"may" not update the timestamp for files written through a memory
> >>mapped view.
> >>
> >>Is this an intended behavior of rebase?
> >Why should rebase change the timestamp?  Apart from the rebasing, the
> >DLL is still the same.  If you want to know when it has been last
> >rebased, you can look into the file header:
> >
> >   $ objdump -p cygiconv-2.dll | grep 'Time/Date[^ ]'
> >   Time/Date               Tue Mar  6 23:24:12 2012
> >
> It depends: Changing data without changing st_mtime avoids
> (unneeded|required) file copies during incremental backups, rsync,
> robocopy, ...
> rebase does not explicitly (re)set the timestamp after rebasing. Is
> this by design?
> It relies on weakly defined Windows behavior: "When modifying a file
> through a mapped view, the last modification timestamp *may* not be
> updated automatically."

Well, let me put it like this.  Rebase just does its job.  It doesn't
actually care for the file timestamp, only for the file header
timestamps.  This is not by design, it's just as it is.  So the next
question is obvious.  Do you think it should change the timestamp or
not?  Why?  A patch is simple and I have it actually already waiting in
the scenery.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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