feat: update depot package version to 1.0.2 and enhance fakeroot support with ownership tracking

build.rs

@@ -12,6 +12,7 @@ const BUILD_OPTION_KEYS: &[&str] = &[
 
 fn main() {
     println!("cargo:rerun-if-env-changed=CC");
+    println!("cargo:rerun-if-changed=src/fakeroot_preload.c");
     for key in BUILD_OPTION_KEYS {
         println!("cargo:rerun-if-env-changed={key}");
         if let Ok(value) = std::env::var(key) {
@@ -19,6 +20,10 @@ fn main() {
         }
     }
 
+    if std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("linux") {
+        build_fakeroot_preload();
+    }
+
     if std::env::var_os("CARGO_FEATURE_STATIC_EXCEPT_LIBC").is_some()
         && std::env::var("CARGO_CFG_TARGET_OS").as_deref() == Ok("linux")
     {
@@ -32,6 +37,31 @@ fn main() {
     }
 }
 
+fn build_fakeroot_preload() {
+    let compiler = std::env::var_os("CC").unwrap_or_else(|| "cc".into());
+    let output_path = std::path::PathBuf::from(
+        std::env::var_os("OUT_DIR").expect("Cargo must provide OUT_DIR to build.rs"),
+    )
+    .join("libdepot_fakeroot.so");
+    let output = std::process::Command::new(compiler)
+        .args([
+            "-std=c11", "-shared", "-fPIC", "-O2", "-Wall", "-Wextra", "-Werror", "-o",
+        ])
+        .arg(&output_path)
+        .arg("src/fakeroot_preload.c")
+        .output()
+        .unwrap_or_else(|error| {
+            panic!("failed to launch C compiler for fakeroot preload: {error}")
+        });
+
+    if !output.status.success() {
+        panic!(
+            "failed to build fakeroot preload library:\n{}",
+            String::from_utf8_lossy(&output.stderr)
+        );
+    }
+}
+
 fn gcc_runtime_archive(name: &str) -> Option<String> {
     let compiler = std::env::var_os("CC").unwrap_or_else(|| "cc".into());
     let output = std::process::Command::new(compiler)