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sys: copy files only if needed #9

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merged 4 commits into from
Sep 7, 2023
Merged

sys: copy files only if needed #9

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b90bee2
sys/build: copy files only if needed
0x2ec Sep 6, 2023
b27542d
sys/build: fix build warnings
0x2ec Sep 6, 2023
45aee3b
sys/build: use matches!() in get_env_bool()
0x2ec Sep 6, 2023
6d911d5
sys/build: inline check_static()
0x2ec Sep 6, 2023
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49 changes: 27 additions & 22 deletions crates/sys/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,14 +9,21 @@ extern crate cmake;
extern crate pkg_config;

use std::{
env,
ffi::OsStr,
fs, io,
path::{Component, Path, PathBuf},
env, fs, io,
path::{Path, PathBuf},
time::SystemTime,
};

#[cfg(target_os = "windows")]
use std::{ffi::OsStr, path::Component};

fn main() {
let is_static = check_static();
// check if static build in the order of:
// PLCTAG_STATIC, PLCTAG_DYNAMIC, rustflags: +crt-static
let is_static = get_env_bool("LIBPLCTAG_STATIC").unwrap_or(false)
|| get_env_bool("LIBPLCTAG_DYNAMIC").map_or(false, |v| !v)
|| cfg!(target_feature = "crt-static");

if is_static {
eprintln!("static build");
}
Expand Down Expand Up @@ -103,6 +110,7 @@ fn install_lib_files(lib_path: impl AsRef<Path>, out_path: impl AsRef<Path>) {
}
}

#[cfg(target_os = "windows")]
fn find_target_profile_dir<'a>(dir: impl AsRef<Path> + 'a) -> Option<PathBuf> {
//out dir looks like ...\plctag-rs\target\debug\build\XXXXX
//profile dir looks like ...\plctag-rs\target\debug\
Expand All @@ -121,23 +129,20 @@ fn find_target_profile_dir<'a>(dir: impl AsRef<Path> + 'a) -> Option<PathBuf> {
}
}

/// check if static build in the order of:
/// PLCTAG_STATIC, PLCTAG_DYNAMIC, rustflags: +crt-static
fn check_static() -> bool {
if let Some(v) = get_env_bool("LIBPLCTAG_STATIC") {
return v;
}
if let Some(v) = get_env_bool("LIBPLCTAG_DYNAMIC") {
return !v;
}
cfg!(target_feature = "crt-static")
fn get_env_bool(key: &str) -> Option<bool> {
env::var(key)
.ok()
.map(|v| matches!(v.to_lowercase().as_ref(), "1" | "true" | "on" | "yes"))
}

fn get_env_bool(key: &str) -> Option<bool> {
env::var(key).ok().map(|v| {
let v = v.to_lowercase();
v == "1" || v == "true" || v == "on" || v == "yes"
})
fn is_file_newer(a: &Path, b: &Path) -> bool {
match (a.symlink_metadata(), b.symlink_metadata()) {
(Ok(meta_a), Ok(meta_b)) => {
meta_a.modified().unwrap_or_else(|_| SystemTime::now())
> meta_b.modified().unwrap_or(SystemTime::UNIX_EPOCH)
}
_ => false,
}
}

fn dir_copy(source_dir: impl AsRef<Path>, dst_dir: impl AsRef<Path>) -> io::Result<()> {
Expand All @@ -164,8 +169,8 @@ fn dir_copy(source_dir: impl AsRef<Path>, dst_dir: impl AsRef<Path>) -> io::Resu

if meta.is_dir() {
dir_copy(entry.path(), dst)?;
} else {
fs::copy(entry.path(), dst)?;
} else if !dst.exists() || is_file_newer(entry.path().as_ref(), dst.as_ref()) {
fs::copy(&entry.path(), &dst)?;
}
}
}
Expand Down
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