Handle clipboard copy on Linux

This is related to an issue with the clipboard handling in xorg,
see aweinstock314/rust-clipboard#61

This now forks a child process and sleeps for 10 seconds, after
which it clears the clipboard before exiting.

Closes #5

CHANGELOG

@@ -7,3 +7,4 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Added
 - Short option `-o` for `passage show --on-screen`
+- Fix clipboard copying on Linux. A child process is spawned and keeps the content on the clipboard for 10 seconds. See #5

Cargo.toml

@@ -20,3 +20,4 @@ rpassword = "4.0"
 structopt = {version="0.3", features=["color"]}
 lazy_static = "1.4"
 clipboard = "0.5"
+fork = "0.1.15"

src/main.rs

@@ -14,6 +14,7 @@ use lazy_static::lazy_static;
 use anyhow::Error;
 use clipboard::ClipboardContext;
 use clipboard::ClipboardProvider;
+use fork::{fork, Fork};
 use secrecy::Secret;
 use structopt::StructOpt;
 
@@ -113,10 +114,18 @@ fn show(entry: &str, on_screen: bool) -> Result<(), Error> {
     let decrypted = String::from_utf8(decrypted)?;
     match on_screen {
         true => println!("{}", decrypted),
-        false => {
-            let mut ctx: ClipboardContext = ClipboardProvider::new().unwrap();
-            ctx.set_contents(decrypted.to_owned()).unwrap();
-        }
+        false => match fork() {
+            Ok(Fork::Child) => {
+                let mut ctx: ClipboardContext = ClipboardProvider::new().unwrap();
+                ctx.set_contents(decrypted.to_owned()).unwrap();
+
+                std::thread::sleep(std::time::Duration::from_secs(10));
+
+                ctx.set_contents("".to_owned()).unwrap();
+            }
+            Err(_) => return Err(Error::msg("Failed to fork()")),
+            _ => {}
+        },
     }
 
     Ok(())