On Fri, 2007-11-23 at 23:51 +0000, Mark Hindley wrote:
> On Fri, Nov 23, 2007 at 01:46:22PM -0800, Ross Boylan wrote:
> > The apt-cacher logs clearly show much different last-modified times from
> > the http headers for Release and Release.gpg, consistent with my somehow
> > having gotten an old Release file. But why?
>
> I *think* I finally have an idea about this.
>
> Someone between you and your mirror is running squid, or some other
> cache (perhaps transparently). Squid uses some fancy magic to determine
> whether to revalidate any request based on how frequently it thinks the
> upstream is changed etc.....
>
My ISP says they do not run a proxy, and doubt there's one on their
provider either. In any event, it seems odd that 2 files with the same
timestamp, fetched at virtually the same time, would be treated
differently.
> In your case, it has not revalidated but just assumed that it's current
> file is still current.
>
> Apt gets round this by specifying Cache-Control: max-age=0 in the
> request which apt-cacher does not understand or pass on.
>
> If I am correct, the following patch should fix it for you. It is a bit
> inflexible, and I have a better one in 1.6.0pre8 whcih I am just
> finishing testing, along with lots of other goodies like IPv6,
> berkeleydb for checksum, multiple daemon addresses, and support for
> using pdiffs to update Package files in the cache.
>
> Could you try it and let me know if I am on the right track
I'll give it a shot.
>
> Mark
>
>
>
> diff --git a/apt-cacher b/apt-cacher
> index eb52622..4ed0da5 100755
> --- a/apt-cacher2
> +++ b/apt-cacher2
> @@ -1570,6 +1570,9 @@ sub ua_act {
> debug_message ("download agent: setting no-cache");
> $ua->default_header('Cache-Control' => 'no-cache', 'Pragma' =>
> 'no-cache');
> }
> + elsif ($is_index_file) {
> + $ua->default_header('Cache-Control' => 'max-age=0');
> + }
>
> debug_message("download agent: getting $url");
> if($only_head) {
>
>
>
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