add the ability to provide credentials via files

Signed-off-by: Filip Schauer <f.schauer@proxmox.com>

src/main.rs

@@ -280,6 +280,18 @@ fn main() -> Result<()> {
                 .help("Encrypt the Backup")
                 .action(ArgAction::SetTrue),
         )
+        .arg(
+            Arg::new("password-file")
+                .long("password-file")
+                .value_name("PASSWORD_FILE")
+                .help("Password file"),
+        )
+        .arg(
+            Arg::new("key-password-file")
+                .long("key-password-file")
+                .value_name("KEY_PASSWORD_FILE")
+                .help("Key password file"),
+        )
         .arg(Arg::new("vma_file"))
         .get_matches();
 
@@ -296,10 +308,46 @@ fn main() -> Result<()> {
     let encrypt = matches.get_flag("encrypt");
 
     let vma_file_path = matches.get_one::<String>("vma_file").unwrap().to_string();
+    let password_file = matches.get_one::<String>("password-file");
+
+    let pbs_password = match password_file {
+        Some(password_file) => {
+            let mut password =
+                std::fs::read_to_string(password_file).context("Could not read password file")?;
+
+            if password.ends_with('\n') || password.ends_with('\r') {
+                password.pop();
+                if password.ends_with('\r') {
+                    password.pop();
+                }
+            }
+
+            password
+        }
+        None => String::from_utf8(tty::read_password("Password: ")?)?,
+    };
 
-    let pbs_password = String::from_utf8(tty::read_password(&"Password: ").unwrap()).unwrap();
     let key_password = match keyfile {
-        Some(_) => Some(String::from_utf8(tty::read_password(&"Key Password: ").unwrap()).unwrap()),
+        Some(_) => {
+            let key_password_file = matches.get_one::<String>("key_password_file");
+
+            Some(match key_password_file {
+                Some(key_password_file) => {
+                    let mut key_password = std::fs::read_to_string(key_password_file)
+                        .context("Could not read key password file")?;
+
+                    if key_password.ends_with('\n') || key_password.ends_with('\r') {
+                        key_password.pop();
+                        if key_password.ends_with('\r') {
+                            key_password.pop();
+                        }
+                    }
+
+                    key_password
+                }
+                None => String::from_utf8(tty::read_password("Key Password: ")?)?,
+            })
+        }
         None => None,
     };