OK, so most of ye know I am on this quest. *Context*: I've a working merkle-ish client tracking changes in a Svn server over DAV, and noting when files directories change and replicating that change on the client side. For files it gets the SHA1 for the file, stores it, and updates local file copies when the SHA1 changes. For directories there's not SHA1 (yet), and it tracks directory revisions. They'll change too fast, so I need to server-side create the SHA1s for directories and cache them appropriately.
I know how to calculate the (presently missing) SHA1s for directories in Svn. I even know how to do that for different auth settings for different users safely. *Intention:* I want to mount (over DAV only) '.indexSHA1s.csv' (or something similar) in every directory, but I don't want those checked in (race condition avoidance, and commit noise). Thus, while those files are visible over DAV, subversion does not know about them, even if they do follow the ACLs apparent in the authz files. Specifically, if you are not permitted to read <root>/foo/bar/ then you cannot read <root>/foo/bar/.indexSHA1s.csv either. *Question:* What Apache2 technique to need to read about, and find docker-style examples for to facilitate this? There's a huge amount of Apache modules, and I can't glean whether Mod_filter or any Apache module is the right tool for the job. Or even if this isn't delivered in modules at all (build in). *More info: *I've prototyped my Merkle hash calc (and recalc) logic in Rust, with tests of course. I may end up writing an apache module for this (and donating back) but right now I'm happy with any Apache2-centric technique (regardless of speed or hackyness) that can acclimate me to augmenting the DAV available Svn representation with files that are hot-calculated (and LRU cached). Can someone point me in the right direction? - Paul
