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extern crate cc;
use std::env;
use std::io;
use std::io::{Read, Write};
use std::fs;
use std::path;
struct Version {
major: String,
minor: String,
git: String,
}
fn stringify(err: env::VarError) -> String {
format!("{}", err)
}
fn extract_git_version(pre: &str) -> Result<String, String> {
// If a pre-release version is set, it is expected to have the format
// pre.v<maj>.<min>.<n>.g<hash>, where <maj> and <min> are the last major and minor version,
// <n> is the number of commits since this version and <hash> is the hash of the last commit.
let parts: Vec<&str> = pre.split('.').collect();
if parts.len() != 5 {
return Err(format!("'{}' is not a valid pre-release version", pre));
}
Ok(format!("{}.{}-{}-{}", parts[1], parts[2], parts[3], parts[4]))
}
fn get_version() -> Result<Version, String> {
let major = env::var("CARGO_PKG_VERSION_MAJOR").map_err(stringify)?;
let minor = env::var("CARGO_PKG_VERSION_MINOR").map_err(stringify)?;
let patch = env::var("CARGO_PKG_VERSION_PATCH").map_err(stringify)?;
let pre = env::var("CARGO_PKG_VERSION_PRE").map_err(stringify)?;
let git = match pre.is_empty() {
true => match patch.is_empty() {
true => format!("v{}.{}", major, minor),
false => format!("v{}.{}.{}", major, minor, patch),
},
false => extract_git_version(&pre)?,
};
Ok(Version {
major,
minor,
git,
})
}
fn prepare_version_source(
version: &Version,
out_path: &path::Path,
library_path: &path::Path
) -> io::Result<path::PathBuf> {
let out = out_path.join("version.cc");
let template = library_path.join("version.cc.in");
let mut file = fs::File::open(template)?;
let mut data = String::new();
file.read_to_string(&mut data)?;
drop(file);
let data = data
.replace("@PROJECT_VERSION_MAJOR@", &version.major)
.replace("@PROJECT_VERSION_MINOR@", &version.minor)
.replace("@PROJECT_VERSION_GIT@", &version.git);
let mut file = fs::File::create(&out)?;
file.write_all(data.as_bytes())?;
Ok(out)
}
fn main() {
let out_dir = env::var("OUT_DIR").expect("Environment variable OUT_DIR is not set");
let out_path = path::PathBuf::from(out_dir);
let version = get_version().expect("Could not extract library version");
let sources = [
"DeviceCommunicationExceptions.cpp",
"NK_C_API.cc",
"NitrokeyManager.cc",
"command_id.cc",
"device.cc",
"log.cc",
"misc.cc",
];
let library_dir = format!("libnitrokey-{}", version.git);
let library_path = path::Path::new(&library_dir);
let version_source = prepare_version_source(&version, &out_path, &library_path)
.expect("Could not prepare the version source file");
cc::Build::new()
.cpp(true)
.include(library_path.join("libnitrokey"))
.files(sources.iter().map(|s| library_path.join(s)))
.file(version_source)
.compile("libnitrokey.a");
println!("cargo:rustc-link-lib=hidapi-libusb");
}
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