1 files changed, 70 insertions, 0 deletions
diff --git a/src/tools/cargo/build.rs b/src/tools/cargo/build.rs
new file mode 100644
index 000000000..752221f8c
--- /dev/null
+++ b/src/tools/cargo/build.rs
@@ -0,0 +1,70 @@
+use flate2::{Compression, GzBuilder};
+use std::ffi::OsStr;
+use std::fs;
+use std::path::Path;
+use std::process::Command;
+
+fn main() {
+    commit_info();
+    compress_man();
+    // ALLOWED: Accessing environment during build time shouldn't be prohibited.
+    #[allow(clippy::disallowed_methods)]
+    let target = std::env::var("TARGET").unwrap();
+    println!("cargo:rustc-env=RUST_HOST_TARGET={target}");
+}
+
+fn compress_man() {
+    // ALLOWED: Accessing environment during build time shouldn't be prohibited.
+    #[allow(clippy::disallowed_methods)]
+    let out_path = Path::new(&std::env::var("OUT_DIR").unwrap()).join("man.tgz");
+    let dst = fs::File::create(out_path).unwrap();
+    let encoder = GzBuilder::new()
+        .filename("man.tar")
+        .write(dst, Compression::best());
+    let mut ar = tar::Builder::new(encoder);
+    ar.mode(tar::HeaderMode::Deterministic);
+
+    let mut add_files = |dir, extension| {
+        let mut files = fs::read_dir(dir)
+            .unwrap()
+            .map(|e| e.unwrap().path())
+            .collect::<Vec<_>>();
+        files.sort();
+        for path in files {
+            if path.extension() != Some(extension) {
+                continue;
+            }
+            println!("cargo:rerun-if-changed={}", path.display());
+            ar.append_path_with_name(&path, path.file_name().unwrap())
+                .unwrap();
+        }
+    };
+
+    add_files(Path::new("src/etc/man"), OsStr::new("1"));
+    add_files(Path::new("src/doc/man/generated_txt"), OsStr::new("txt"));
+    let encoder = ar.into_inner().unwrap();
+    encoder.finish().unwrap();
+}
+
+fn commit_info() {
+    if !Path::new(".git").exists() {
+        return;
+    }
+    let output = match Command::new("git")
+        .arg("log")
+        .arg("-1")
+        .arg("--date=short")
+        .arg("--format=%H %h %cd")
+        .arg("--abbrev=9")
+        .output()
+    {
+        Ok(output) if output.status.success() => output,
+        _ => return,
+    };
+    let stdout = String::from_utf8(output.stdout).unwrap();
+    let mut parts = stdout.split_whitespace();
+    let mut next = || parts.next().unwrap();
+    println!("cargo:rustc-env=CARGO_COMMIT_HASH={}", next());
+    println!("cargo:rustc-env=CARGO_COMMIT_SHORT_HASH={}", next());
+    println!("cargo:rustc-env=CARGO_COMMIT_DATE={}", next())
+}