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build: Use the crate version when the 'git describe' command failed

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In our build-script (build.rs), we won't set the environment variable
'BUILD_VERSION' when the 'git describe' command failed (e.g. when the
current source tree does not contain git information). This patch added
a fall back path where the default value of 'BUILD_VERSION' is based on
the 'cloud-hypervisor' crate version.

Fixes: #1669

Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen 2020-09-04 14:31:38 -07:00 committed by Sebastien Boeuf
parent 318ad83509
commit 559d1840d8
2 changed files with 16 additions and 8 deletions
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3
Cargo.toml
View File

@ -24,6 +24,9 @@ vhost_user_net = { path = "vhost_user_net"}
vmm = { path = "vmm" }
vmm-sys-util = "0.6.1"
[build-dependencies]
clap = { version = "2.33.3", features = ["wrap_help"] }
[patch.crates-io]
vm-memory = { git = "https://github.com/cloud-hypervisor/vm-memory", branch = "ch" }

21
build.rs
View File

@ -3,20 +3,25 @@
// SPDX-License-Identifier: Apache-2.0
//
#[macro_use(crate_version)]
extern crate clap;
use std::process::Command;
fn main() {
let git_out = Command::new("git")
.args(&["describe", "--dirty"])
.output()
.expect("Expect to get git describe output");
let mut version = crate_version!().to_string();
if let Ok(git_out) = Command::new("git").args(&["describe", "--dirty"]).output() {
if git_out.status.success() {
if let Ok(git_out_str) = String::from_utf8(git_out.stdout) {
version = git_out_str;
}
}
}
// This println!() has a special behavior, as it will set the environment
// variable BUILT_VERSION, so that it can be reused from the binary.
// Particularly, this is used from src/main.rs to display the exact
// version.
println!(
"cargo:rustc-env=BUILT_VERSION={}",
String::from_utf8(git_out.stdout).unwrap()
);
println!("cargo:rustc-env=BUILT_VERSION={}", version);
}