Setup basic CLI

.gitignore

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+/target
+
+# Created by https://www.toptal.com/developers/gitignore/api/rust,git
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust,git
+
+### Git ###
+# Created by git for backups. To disable backups in Git:
+# $ git config --global mergetool.keepBackup false
+*.orig
+
+# Created by git when using merge tools for conflicts
+*.BACKUP.*
+*.BASE.*
+*.LOCAL.*
+*.REMOTE.*
+*_BACKUP_*.txt
+*_BASE_*.txt
+*_LOCAL_*.txt
+*_REMOTE_*.txt
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# End of https://www.toptal.com/developers/gitignore/api/rust,git

Cargo.toml

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+[package]
+name = "systemquery"
+version = "0.1.0"
+authors = ["Starbeamrainbowlabs <sbrl@starbeamrainbowlabs.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+log = "0.4"			# Apparently Rust has an entire logging setup - this is the base crate
+pretty_env_logger = "0.4"	# The logging implementation we've chosen for the above
+
+
+clap = "2"				# CLI argument parser
+
+
+psk-client = { version = "0.1", features = ["vendored-openssl"] }	# Pre-shared key TLS support

src/main.rs

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+#[macro_use]
+extern crate clap;
+extern crate pretty_env_logger; 
+
+use std::process;
+
+use clap::{ App, AppSettings, Arg, SubCommand };
+
+fn main() {
+    // Initialise the logging system
+    pretty_env_logger::init();
+    
+    let mut cli = App::new("systemquery")
+        .version(crate_version!())
+        .author("Starbeamrainbowlabs")
+        .about("Distributed system information query tool")
+        .global_settings(&[ AppSettings::ColoredHelp ])
+        .subcommand(SubCommand::with_name("agent")
+            .about("Starts the systemquery agent")
+            .arg(Arg::with_name("config")
+                .short("c").long("config")
+                .value_name("path/to/config.toml")
+                .help("Specifies the config file location")
+                .takes_value(true)
+                .default_value("/etc/systemquery/systemquery.toml")))
+        .subcommand(SubCommand::with_name("query")
+            .about("Query the cluster [requires agent to be running on this host]")
+            .arg(Arg::with_name("address")
+                .short("a").long("address")
+                .takes_value(true)
+                .help("Address of the agent to connect to")
+                .takes_value(true) 
+                .default_value("unix-abstract:systemquery")));
+    let args = cli.clone().get_matches();
+    
+    match args.subcommand_name() {
+        Some("agent") => {
+            println!("Coming soon :-)");
+        },
+        Some("query") => {
+            println!("Coming soon :-)");
+        },
+        None => {
+            cli.print_help().ok();
+            println!("\n");
+            process::exit(0);
+        },
+        _ => {
+            println!("Error: Unknown subcommand {}", args.subcommand_name().unwrap());
+            process::exit(1);
+        }
+    }
+}