[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: mtime of fresh .go
From: |
Ludovic Courtès |
Subject: |
Re: mtime of fresh .go |
Date: |
Tue, 20 Jul 2010 00:17:08 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.2 (gnu/linux) |
Hello!
Andy Wingo <address@hidden> writes:
> On Mon 19 Jul 2010 00:31, address@hidden (Ludovic Courtès) writes:
>
>> Andy Wingo <address@hidden> writes:
>>
>>> On Fri 16 Jul 2010 10:07, address@hidden (Ludovic Courtès) writes:
>>>
>>>> commit 535fb833b34dfc3cc11a679d39390b06fd7e9180
>>>> Author: Andy Wingo <address@hidden>
>>>> Date: Fri Jun 5 10:51:21 2009 +0200
>>>>
>>>> stamp .go with timestamp of .scm; a fresh go has same mtime of .scm
>>>>
>>>> * libguile/load.c (compiled_is_fresh): Rename from compiled_is_newer.
>>>> Check that the mtines of the .go and .scm match exactly, so we
>>>> don't
>>>> get fooled by rsync-like modifications of the filesystem.
>>>>
>>>> When packaging things “normally”, the .go has an mtime strictly greater
>>>> than that of the source file, so checking for equality doesn’t work.
>>>
>>> But when reinstalling code from a binary packaging system, sometimes the
>>> mtime can go backwards.
>>
>> Please forgive my ignorance, but can you give an example of how this can
>> happen?
>
> Well there are two cases really:
>
> * RPM or Deb systems typically timestamp their files based on the times
> they were built, not installed, and we don't have guarantees that
> upgrading a package won't actually move the mtime into the past.
What matters is that the mtime(.go) >= mtime(.scm), and I’d expect it to
be preserved by packaging systems, even after an upgrade, no?
(My understanding is that RPMs/Debs are tar-like archives containing
meta-data such as the mtime, which is restored upon extraction.)
> * When installing source code (via _SOURCES / _DATA), you don't have
> any guarantees about the relations between the times of the SOURCE
> and DATA files, *as installed*.
Apparently “make install” preserves mtimes on my system. IOW, since
uninstalled .gos have mtime >= uninstalled .scms, the same holds for
installed .gos and .scms.
We’d need to ask the Automake people to check whether this is always the
case.
Thanks,
Ludo’.
- mtime of fresh .go, Ludovic Courtès, 2010/07/16
- Re: mtime of fresh .go, Andy Wingo, 2010/07/18
- Re: mtime of fresh .go, Ludovic Courtès, 2010/07/18
- Re: mtime of fresh .go, Andy Wingo, 2010/07/20
- Re: mtime of fresh .go, Ludovic Courtès, 2010/07/20
- Re: mtime of fresh .go, Andy Wingo, 2010/07/20
- Re: mtime of fresh .go, Ludovic Courtès, 2010/07/21