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We don't want MutCfg to be automatially coneable, or we'll wind up with
surprises like the one that this patch fixes in TorClient.
(The "surprise" is that reconfigure() would only apply its
client-specific options to one client instance.)
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This will help in the case when a configuration can only partially
change.
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It's useful to keep configuration objects inside a RwLock<Arc<>>, so we
can have slightly-stale pointers to the existing configuration structure
without holding locks too long.
This code adds a MutCfg type with basic support for this pattern,
and functions to make it a bit more ergonomic.
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This patch doesn't actually make anything reconfigurable, but it
does create an API that will tell you "you can't change the value of
that!" If the API looks reasonable, I can start making it possible
to change the values of individual items.
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The sane_defaults() call is now the same as you get from a default
builder: by convention, we just call that method Default::default().
The with_directories() constructor makes more sense as a constructor
for the TorClientConfigBuilder than for TorClientConfig.
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Also fix some commonwealth spellings that had slipped in.
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Doing this is necessary for reconfiguration support, and will help a lot
with testing, too.
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Since these shell-variables are hardwired to use org.torproject.Arti as
the program name, it isn't appropriate to call them "app-specific".
If we someday reinstate APP_FOO, it should be based on a user-provided
application name.
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In order to handle explicitly specified path buffers directly, we now
let CfgPath be either a string (that gets expanded) or a PathBuf
(that doesn't).
This simplifies TorClientConfig::with_directories()
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Now every section that the two configuration objects share has the
same type and name. This should help us in documenting our configuration
in a way that doesn't confuse people.
There is still lots of API work to go.
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To do this at all neatly, I had to split out `tor-config` from
`arti-config` again, and putting the lower level stuff (paths,
builder errors) into tor-config. I also changed our use of
derive_builder to always use a common error type, to avoid
error type proliferation.
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I'm about to make tor-config a higher-level module, so it can't be a
dependency for tor-config.
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This switches out `arti`'s argument-parsing library with `clap`, which
is a lot more featureful (and very widely used within the Rust
ecosystem). We also now use a lot of `clap`'s features to improve the
CLI experience:
- The CLI now expects a subcommand (currently, either "help", or "proxy"
for the existing SOCKS proxy behaviour). This should let us add
additional non-SOCKS-proxy features to arti in future.
- `clap` supports default values determined at runtime, so the way the
default config file is loaded was changed: now, we determine the
OS-specific path for said file before invoking `clap`, so the help
command can show it properly.
- The behaviour of `tor_config` was also changed; now, one simply
specifies a list of configuration files to load, together with
whether they're required.
- That function also way overused generics; this has been fixed.
- Instead of using the ARTI_LOG environment variable to configure
logging, one now uses the `-l, --log-level` CLI option.
(The intent is for this option to be more discoverable by users.)
- The `proxy` subcommand allows the user to override the SOCKS port used
on the CLI without editing the config file.
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(One represents code that I forgot to write.)
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This will cause some pain for now, but now is really the best time
to do this kind of thing.
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