From: Tracey Emery <tracey@traceyemery.net>
Subject: Re: struct for priv_fds
To: gameoftrees@openbsd.org
Date: Mon, 30 May 2022 07:55:39 -0600

On Sun, May 29, 2022 at 05:35:02PM +0200, Stefan Sperling wrote:
> On Wed, May 25, 2022 at 04:44:04PM -0600, Tracey Emery wrote:
> > Howdy,
> > 
> > I'd like to add the following to got_repository.h to prepare for adding
> > multiple privileged fds to gotwebd, instead of the single one it has
> > now.
> > 
> > ok?
> 
> Can you show how this will be used?
> 
> Each fd that is being passed around should serve a dedicated purpose.
> It could be a temporary file that is used e.g. during delta application
> or some other process that needs to store temporary state that may not
> fit into memory. It could be a file output is written to. It could be
> a file that contains input the other process will use. And so on.
> 
> With a list like this, how can we tell the purpose of each fd on the list?
> Is that what the 'id' member is for?
> Wouldn't it make more sense to pass required fds as function arguments?
> And if multiple fds are required for a shared purpose, could we not pass
> an fd array and a length instead of a list?

No, that makes total sense. I had not thought about an array.

Then, what about something like below as a starting point? An array can
be loaded up and this would give us an association for each fd.

-- 

Tracey Emery

diff d6a28ffe187127e3247254d7e242bb52d66eb26b /home/tracey/src/got
blob - b6e44e8b40b8476a471c53fd10cffd4a7ff3b32d
file + include/got_repository.h
--- include/got_repository.h
+++ include/got_repository.h
@@ -177,3 +177,12 @@ const struct got_error *got_repo_get_loose_object_info
 /* Obtain the number and size of packed objects in the repository. */
 const struct got_error *got_repo_get_packfile_info(int *npackfiles,
     int *nobjects, off_t *total_packsize, struct got_repository *);
+
+/* Privileged file descriptors */
+enum got_priv_fds {
+	DIFF_FD,
+	BLAME_FD,
+	PACK_BASE_FD,
+	PACK_ACCUM_FD,
+	PRIV_FDS__MAX,
+};