tests: migrate unit tests to Rust

Cargo.toml

@@ -7,6 +7,7 @@ repository = "https://github.com/coreos/update-ssh-keys"
 documentation = "https://docs.rs/update-ssh-keys"
 description = "A tool for managing authorized SSH keys"
 version = "0.4.2-alpha.0"
+edition = "2021"
 
 [dependencies]
 fs2 = "0.4"
@@ -15,6 +16,8 @@ error-chain = { version = "0.12", default-features = false }
 clap = { version = "4.4.6", features = ["cargo"] }
 uzers = "0.11.3"
 openssh-keys = "0.6.2"
+lazy_static = "1.4.0"
+tempfile = "3.8.0"
 
 [[bin]]
 name = "update-ssh-keys"

README.md

@@ -1,7 +1,7 @@
 # update-ssh-keys
 
-[![Build Status](https://travis-ci.org/coreos/update-ssh-keys.svg?branch=master)](https://travis-ci.org/coreos/update-ssh-keys)
-![minimum rust 1.28](https://img.shields.io/badge/rust-1.28%2B-orange.svg)
+[![Github CI](https://github.com/flatcar/update-ssh-keys/actions/workflows/rust.yml/badge.svg)](https://github.com/flatcar/update-ssh-keys/actions)
+![minimum rust 1.60](https://img.shields.io/badge/rust-1.60%2B-orange.svg)
 
 `update-ssh-keys` is a command line tool and a library for managing openssh
 authorized public keys. It keeps track of sets of keys with names, allows for
@@ -15,6 +15,6 @@ non-Container Linux machine, you can build the project with `cargo build
 --release`. The rust toolchain is required to build it. You can install `rustup`
 to manage your rust toolchain - https://www.rustup.rs. 
 
-`test/test_update_ssh_keys.py` is a python script which tests the functionality
+`test/test_update_ssh_keys.rs` is a Rust program which tests the functionality
 of the `update-ssh-keys` command line tool. If changes are made to
 `update-ssh-keys`, that script should be run.

src/lib.rs

@@ -506,6 +506,11 @@ impl AuthorizedKeys {
         })
     }
 
+    /// close file lock to release resources for other processes
+    pub fn close(&self) -> Result<()> {
+        self.lock.unlock()
+    }
+
     /// get_keys gets the authorized keyset with the provided name
     pub fn get_keys(&self, name: &str) -> Option<&AuthorizedKeySet> {
         self.keys.get(name)