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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
use std::path::{Path, PathBuf};
use std::process::Command;
use std::{env, fs};
fn main() {
if cfg!(feature = "media-gstreamer") {
println!("cargo:rerun-if-changed=../../python/servo/gstreamer.py");
let output = Command::new(find_python())
.arg("../../python/servo/gstreamer.py")
.arg(std::env::var_os("TARGET").unwrap())
.output()
.unwrap();
if !output.status.success() {
eprintln!("{}", String::from_utf8_lossy(&output.stdout));
eprintln!("{}", String::from_utf8_lossy(&output.stderr));
std::process::exit(1)
}
let path = Path::new(&env::var_os("OUT_DIR").unwrap()).join("gstreamer_plugins.rs");
fs::write(path, output.stdout).unwrap();
}
}
/// Tries to find a suitable python
///
/// Algorithm
/// 1. Trying to find python3/python in $VIRTUAL_ENV (this should be from servos venv)
/// 2. Checking PYTHON3 (set by mach)
/// 3. Falling back to the system installation.
///
/// Note: This function should be kept in sync with the version in `components/script/build.rs`
fn find_python() -> PathBuf {
let mut candidates = vec![];
if let Some(venv) = env::var_os("VIRTUAL_ENV") {
// See: https://docs.python.org/3/library/venv.html#how-venvs-work
let bin_dir = if cfg!(windows) { "Scripts" } else { "bin" };
let bin_directory = PathBuf::from(venv).join(bin_dir);
candidates.push(bin_directory.join("python3"));
candidates.push(bin_directory.join("python"));
}
if let Some(python3) = env::var_os("PYTHON3") {
candidates.push(PathBuf::from(python3));
}
let system_python = ["python3", "python"].map(PathBuf::from);
candidates.extend_from_slice(&system_python);
for name in &candidates {
// Command::new() allows us to omit the `.exe` suffix on windows
if Command::new(name)
.arg("--version")
.output()
.is_ok_and(|out| out.status.success())
{
return name.to_owned();
}
}
let candidates = candidates
.into_iter()
.map(|c| c.into_os_string())
.collect::<Vec<_>>();
panic!(
"Can't find python (tried {:?})! Try enabling Servo's Python venv, \
setting the PYTHON3 env var or adding python3 to PATH.",
candidates.join(", ".as_ref())
)
}
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