sccache 0.1.0

Sccache is a ccache-like tool. It is used as a compiler wrapper and avoids compilation when possible, storing a cache in a remote storage using the S3 API.
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// Copyright 2016 Mozilla Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

extern crate app_dirs;
extern crate chrono;
extern crate clap;
extern crate crypto;
#[cfg(unix)]
extern crate daemonize;
extern crate env_logger;
extern crate filetime;
extern crate futures;
extern crate hyper;
extern crate kernel32;
extern crate local_encoding;
#[macro_use]
extern crate log;
extern crate fern;
extern crate libc;
extern crate mio;
extern crate number_prefix;
extern crate protobuf;
extern crate regex;
extern crate retry;
extern crate rustc_serialize;
extern crate serde_json;
extern crate sha1;
extern crate tempdir;
extern crate time;
extern crate winapi;
extern crate which;
extern crate zip;

// To get macros in scope, this has to be first.
#[cfg(test)]
#[macro_use]
mod test;

mod cache;
mod client;
mod cmdline;
mod commands;
mod compiler;
mod mock_command;
mod protocol;
mod server;
mod simples3;

use std::env;

fn main() {
    init_logging();
    std::process::exit(commands::run_command(cmdline::parse()));
}


fn init_logging(){
    match env::var("RUST_LOG")
        .or(Err(()))
        .and_then(|_| env_logger::init().or(Err(())))
        .or_else(|_| {
            let logger_config = fern::DispatchConfig {
                format: Box::new(|msg: &str, level: &log::LogLevel, _location: &log::LogLocation| {
                    format!("[{}][{}] {}", time::now().strftime("%Y-%m-%d][%H:%M:%S").unwrap(), level, msg)
                }),
                output: vec![fern::OutputConfig::stdout(), fern::OutputConfig::file("sccache2.log")],
                level: log::LogLevelFilter::Trace,
            };

            // Set current log level depending on environment variable
            let log_level = match &*env::var("SCCACHE2_LOG_LEVEL").unwrap_or("warn".to_owned()).to_lowercase() {
                "off" => log::LogLevelFilter::Off,
                "error" => log::LogLevelFilter::Error,
                "info" => log::LogLevelFilter::Info,
                "debug" => log::LogLevelFilter::Debug,
                "trace" => log::LogLevelFilter::Trace,
                _=> log::LogLevelFilter::Warn,
            };

            fern::init_global_logger(logger_config, log_level).or(Err(()))
        }) {
            Ok(_) => {},
            Err(_) => panic!("Failed to initialize logging"),
        }
}