Extended info on --version

[rinor]

Is your feature request related to a problem/context ? Please describe if applicable.
This is a JIP and expands a bit over #645 and #606.
Right now the reported version from jormungandr --version compiled from master is the same as the one from the latest release so there is no way to tell if the binary is up to date or not. Furthermore since master is a fast moving branch, it would be nice to have more info reported form --version.

Describe the solution you'd like
The following is just an example and may be tweeked as needed.

jormungandr 0.3.3 (master-3326b9b+, debug build, linux [x86_64]) - [rustc 1.37.0 (eae3437df 2019-08-13)]
\_________/ \___/  \____/ \_____/|  \_________/  \___/  \____/      \_________________________________/
 |           |      |      |     |   |            |      |           |
 |           |      |      |     |   |            |      |           +- rustc --version
 |           |      |      |     |   |            |      +- std::env::consts::ARCH
 |           |      |      |     |   |            +- std::env::consts::OS
 |           |      |      |     |   +- Checks debug_assertions
 |           |      |      |     +- Adds a "+" if the working tree is not clean
 |           |      |      +- Commit hash
 |           |      +- Current branch name
 |           +- Package version from Cargo.toml
 +- Package name from Cargo.toml

Additional context
To produce the proposed output, tried to create a cargo build script build.rs that (ab)uses CARGO_PKG_VERSION, but due to zero rust experience wasn't able to properly complete it.
¯\_(ツ)_/¯
In the example the only dependency is the git binary and there is no need to change any other part of the code.
The following works, but needs proper error handling. The missing part is that if git binary is missing or there is an error, the build should continue and the reported version should the same as today jormungandr 0.3.3

use std::env::consts::{ARCH, OS};
use std::process::Command;

#[cfg(debug_assertions)]
const BUILD_TYPE: &'static str = "debug";
#[cfg(not(debug_assertions))]
const BUILD_TYPE: &'static str = "release";

fn main() {
    let version_string = format!(
        "{} ({}-{}{}, {}, {} [{}]) - [{}]",
        env!("CARGO_PKG_VERSION"),
        git_branch_name(),
        git_commit_hash(),
        if git_working_tree_isclean() { "" } else { "+" },
        BUILD_TYPE,
        OS,
        ARCH,
        compiler_version()
    );

    println!("cargo:rustc-env=CARGO_PKG_VERSION={}", version_string);
}

fn compiler_version() -> String {
    let output = Command::new("rustc")
        .arg("--version")
        .current_dir(env!("CARGO_MANIFEST_DIR"))
        .output()
        .unwrap();

    assert!(output.status.success());

    String::from_utf8_lossy(&output.stdout)
        .trim_end()
        .to_string()
}

fn git_commit_hash() -> String {
    let output = Command::new("git")
        .arg("rev-parse")
        .arg("--short")
        .arg("HEAD")
        .current_dir(env!("CARGO_MANIFEST_DIR"))
        .output()
        .unwrap();

    assert!(output.status.success());

    String::from_utf8_lossy(&output.stdout)
        .trim_end()
        .to_string()
}

fn git_branch_name() -> String {
    let output = Command::new("git")
        .arg("rev-parse")
        .arg("--abbrev-ref")
        .arg("HEAD")
        .current_dir(env!("CARGO_MANIFEST_DIR"))
        .output()
        .unwrap();

    assert!(output.status.success());

    String::from_utf8_lossy(&output.stdout)
        .trim_end()
        .to_string()
}

fn git_working_tree_isclean() -> bool {
    let status = Command::new("git")
        .arg("diff")
        .arg("--quiet")
        .arg("--exit-code")
        .arg("HEAD")
        .current_dir(env!("CARGO_MANIFEST_DIR"))
        .status()
        .unwrap();

    status.code().unwrap() == 0
}

Note: https://vallentin.io/2019/06/06/versioning served as guide for the idea and the code.

[NicolasDP]

This is a great Idea. I'd love to see this in for jormungandr's binary and jcli's binary.

@rinor do you think you could make a PR for jcli's and jormungandr's build.rs for these?