In commit 3f9d0c0762, we added a new possible private file. If the file
exists but there's an error reading it (common for permission issues),
currently we just move on to the next file, and if it doesn't exist we
may give up with that error.
That can "hide" the access problems making them harder to debug.
To help with those kinds of errors, this patch updates the logic to
return an error if a private key exists but is inaccessible.
It also adds an unit test for this function to cover the different
scenarios, and updates the docs to match.
This patch allows the configuration values to be overridden from the
command-line, with a new -config_overrides flag.
There is a fairly specific use case for this, when editing the
configuration file is not feasible or convenient (e.g. running an
user-supplied configuration in a managed environment).
This patch adds man pages for chasquid's main commands and
configuration. They are generated using pod2man (commonly used for this,
and included with perl in most distributions).
The generated man pages are included to avoid introducing a dependency
for such simple task, similar to how we handle protocol buffer generated
files.
Alberto Bertogli