CacheServer option (or whatever to work around server error limit)

[Christian Hesse]

Allan McRae <allan at archlinux.org> on Thu, 2022/01/13 23:52:
> On 13/1/22 23:11, Christian Hesse wrote:
> > Hello everybody,
> > 
> > I am still struggling with pacman having the server error limit enabled by
> > default. My attempt to fix this for my use case with http headers [0] was
> > reject.
> > 
> > Also someone proposed to add a configuration option to disable server
> > error limit [1]... It was rejected as well.
> > 
> > But I guess the best way to solve this is finally implementing an option
> > "CacheServer", as requested a long time ago [2]. Looks like Allan did not
> > fine the "spare 30 minutes" [3] to implement... :)
> > 
> > Thus I would like to have a look. Still I would like to have a rough guide
> > where to put what and how to glue things. Anybody wants to share some
> > thoughts what an acceptable solution should look like?
> > 
> > [0] https://lists.archlinux.org/pipermail/pacman-dev/2021-May/025159.html
> > [1] https://bugs.archlinux.org/task/71352
> > [2] https://bugs.archlinux.org/task/23407
> > [3]
> > https://lists.archlinux.org/pipermail/pacman-dev/2021-June/025184.html  
> 
> I have had a spare 5 minutes...   you need to add a CacheServer global 
> option to pacman.conf and wire that into pacman & libalpm.   Then when 
> forming the list of Servers in a download payload for a package, you 
> need to add that server at the top and note that it is a cache server.

Sure, so we want to put cache and regular servers in a single list?

Currently this uses alpm_list_t, which is a doubly linked list. The servers
are added as 'char *' there. Do we want to add a struct for servers which adds
a field for storing its type?

typedef struct _alpm_server_t {
	int cache;
	char *server;
} alpm_server_t;

> Then in the try next server function, check if we are using the cache 
> server, and silently move onto the normal servers.

-- 
main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
"CX:;",b;for(a/*    Best regards             my address:    */=0;b=c[a++];)
putchar(b-1/(/*    Chris            cc -ox -xc - && ./x    */b/42*2-3)*42);}
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