The code here checks if the repo being requested doesn't exist.
If it doesn't, then a write operation might create it. But a read
operation doesn't make any sense, and should error out. So simply
check the access mode.

I assume this was the intent here, but only checked for one "verb"
instead, while there exist other read-only verbs as well. And ofc
more can be introduced in the future ;)

Possibly some write verbs don't make sense as well (presumably
those that only add stuff incrementally to existing repos)?

this makes no functional changes

Coalesce access mode detection into one place.
Yes, "upload" really has opposite semantics for
git commands vs. git-lfs commands. Wow.

This commit makes no functional changes.

Also add handler in runServ()

Doesn't add support for the locking API yet