refactor(depot): Generalise folder restriction readTree filter r/3069

This refactors the readTree filter which disallows access to //users
from outside of //users into a reusable function.

The only change in functionality is that the error message has changed
slightly. I thought it is useful to keep the message consistent (i.e.
always including a path), thus only a part of the error is templated
in (describing the reason for why a specific sub path is unavailable).

Change-Id: I30ad38b2677be5aa502c753c8c71e7ba3efc87be
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3872
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

0 files changed, 0 insertions, 0 deletions