transparent 0.4.2

A crate for running processes on a virtual desktop / virtual X server environment.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139

use std::{
    env,
    error::Error,
    fs,
    path::{Path, PathBuf},
    process::Command,
};

use build_target::Profile;
use path_absolutize::Absolutize;
use walkdir::WalkDir;

const RUNNER_CRATE_NAME: &str = "virtual-desktop-runner";

pub fn main() {
    cargo_emit::rerun_if_changed!("{}", source_runner_crate_path().display());

    build_runner_inplace()
        .or_else(|_| build_runner_in_out_dir())
        .or_else(|_| build_runner_in_temp_dir())
        .unwrap();
}

fn build_runner_at_target(runner_crate_path: &Path) -> Result<(), Box<dyn Error>> {
    let mut command = Command::new("cargo");
    command
        .arg("build")
        .arg("--target")
        .arg(build_target::target_triple())
        .arg("-Z")
        .arg("unstable-options")
        .arg("--out-dir")
        .arg(out_dir().join(RUNNER_CRATE_NAME).join("out"))
        .current_dir(runner_crate_path);
    if Profile::current() == Profile::Release {
        command.arg("--release");
    }

    command.spawn()?.wait()?.exit_ok()?;

    Ok(())
}

fn copy_runner_crate_to(target_crate_path: &Path) -> Result<(), Box<dyn Error>> {
    if target_crate_path.join("Cargo.toml").exists() {
        return Ok(());
    }

    fs::create_dir_all(target_crate_path).unwrap();

    let source_runner_crate_path = source_runner_crate_path();
    let gitignore_path = source_runner_crate_path.join(".gitignore");
    let gitignore_file = gitignore::File::new(&gitignore_path).ok();
    let gitignore_filter = move |path: &Path| {
        !gitignore_file
            .as_ref()
            .map(|f| f.is_excluded(path).unwrap())
            .unwrap_or(false)
    };

    for entry in WalkDir::new(&source_runner_crate_path)
        .into_iter()
        .filter_map(|e| e.ok())
        .filter(|e| gitignore_filter(e.path()))
    {
        if entry.path_is_symlink() {
            continue;
        }

        let source_path = entry.path();
        let relative_path = source_path.strip_prefix(&source_runner_crate_path)?;
        let target_path = target_crate_path.join(relative_path);
        if entry.file_type().is_dir() {
            fs::create_dir(&target_path).unwrap();
        } else {
            assert!(entry.file_type().is_file());
            fs::copy(source_path, &target_path).unwrap();
        }
    }

    fs::copy(
        target_crate_path.join("Cargo.toml.why-no-bin-deps"),
        target_crate_path.join("Cargo.toml"),
    )
    .unwrap();

    Ok(())
}

fn build_runner_inplace() -> Result<(), Box<dyn Error>> {
    println!("Building {RUNNER_CRATE_NAME} inplace...");
    let runner_crate_real_config = source_runner_crate_path().join("Cargo.toml");
    if !runner_crate_real_config.exists() {
        return Err("Inplace Cargo.toml not present.".into());
    }
    build_runner_at_target(&source_runner_crate_path())
}

fn build_runner_in_out_dir() -> Result<(), Box<dyn Error>> {
    println!("Building {RUNNER_CRATE_NAME} in out dir...");
    let target_runner_crate_path = out_dir().join(RUNNER_CRATE_NAME).join("crate");
    copy_runner_crate_to(&target_runner_crate_path).unwrap();
    build_runner_at_target(&target_runner_crate_path)
}

fn build_runner_in_temp_dir() -> Result<(), Box<dyn Error>> {
    println!("Building {RUNNER_CRATE_NAME} in temp dir...");
    let target_runner_crate_dir = tempfile::Builder::new()
        .prefix(&format!("{RUNNER_CRATE_NAME}-"))
        .tempdir()
        .unwrap();
    let target_runner_crate_path = target_runner_crate_dir.path();

    copy_runner_crate_to(target_runner_crate_path).unwrap();
    build_runner_at_target(target_runner_crate_path)
}

fn out_dir() -> PathBuf {
    PathBuf::from(env::var("OUT_DIR").unwrap())
        .absolutize()
        .unwrap()
        .into_owned()
}

fn current_dir() -> PathBuf {
    env::current_dir()
        .unwrap()
        .absolutize()
        .unwrap()
        .into_owned()
}

fn source_runner_crate_path() -> PathBuf {
    current_dir()
        .join(RUNNER_CRATE_NAME)
        .absolutize()
        .unwrap()
        .into_owned()
}