add build-script-utils from Substrate (#422)

Cargo.dev.toml

@@ -17,6 +17,7 @@ members = [
 	"xtokens",
 	"xcm-support",
 	"unknown-tokens",
+	"build-script-utils",
 ]
 resolver = "2"
 

build-script-utils/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "orml-build-script-utils"
+description = "Crate with utility functions for `build.rs` scripts."
+repository = "https://github.com/open-web3-stack/open-runtime-module-library/tree/master/build-script-utils"
+license = "Apache-2.0"
+version = "0.4.1-dev"
+authors = ["Parity Technologies <[email protected]>", "Laminar Developers <[email protected]>"]
+edition = "2018"
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]
+
+[dependencies]
+platforms = "1.1"

build-script-utils/README.md

@@ -0,0 +1,3 @@
+Crate with utility functions for `build.rs` scripts.
+
+License: Apache-2.0

build-script-utils/src/lib.rs

@@ -0,0 +1,5 @@
+//! Crate with utility functions for `build.rs` scripts.
+
+mod version;
+
+pub use version::*;

build-script-utils/src/version.rs

@@ -0,0 +1,55 @@
+use platforms::*;
+use std::process::Command;
+
+/// Generate the `cargo:` key output
+pub fn generate_cargo_keys() {
+	println!(
+		"cargo:rustc-env=SUBSTRATE_CLI_IMPL_VERSION={}",
+		get_version(get_commit())
+	)
+}
+
+fn get_platform() -> String {
+	let env_dash = if TARGET_ENV.is_some() { "-" } else { "" };
+
+	format!(
+		"{}-{}{}{}",
+		TARGET_ARCH.as_str(),
+		TARGET_OS.as_str(),
+		env_dash,
+		TARGET_ENV.map(|x| x.as_str()).unwrap_or(""),
+	)
+}
+
+fn get_version(impl_commit: String) -> String {
+	let commit_dash = if impl_commit.is_empty() { "" } else { "-" };
+
+	format!(
+		"{}{}{}-{}",
+		std::env::var("CARGO_PKG_VERSION").unwrap_or_default(),
+		commit_dash,
+		impl_commit,
+		get_platform(),
+	)
+}
+
+fn get_commit() -> String {
+	let commit = std::env::var("GIT_COMMIT").unwrap_or_default();
+	if !commit.is_empty() {
+		return commit;
+	}
+
+	let output = Command::new("git").args(&["rev-parse", "--short", "HEAD"]).output();
+
+	match output {
+		Ok(o) if o.status.success() => String::from_utf8_lossy(&o.stdout).trim().into(),
+		Ok(o) => {
+			println!("cargo:warning=Git command failed with status: {}", o.status);
+			"unknown".into()
+		}
+		Err(err) => {
+			println!("cargo:warning=Failed to execute git command: {}", err);
+			"unknown".into()
+		}
+	}
+}