chore: checkpoint before Python removal

vendor/tar/examples/extract_file.rs

@@ -0,0 +1,25 @@
+//! An example of extracting a file in an archive.
+//!
+//! Takes a tarball on standard input, looks for an entry with a listed file
+//! name as the first argument provided, and then prints the contents of that
+//! file to stdout.
+
+extern crate tar;
+
+use std::env::args_os;
+use std::io::{copy, stdin, stdout};
+use std::path::Path;
+
+use tar::Archive;
+
+fn main() {
+    let first_arg = args_os().nth(1).unwrap();
+    let filename = Path::new(&first_arg);
+    let mut ar = Archive::new(stdin());
+    for file in ar.entries().unwrap() {
+        let mut f = file.unwrap();
+        if f.path().unwrap() == filename {
+            copy(&mut f, &mut stdout()).unwrap();
+        }
+    }
+}