Trying to figure out blkid thing. Add --probe flag.

src/nyan_system.rs

@@ -115,6 +115,7 @@ pub fn exec_command(cmd: &str, args: &Vec<&str>) -> Result<(), ExecCommandError>
 pub fn find_partlabel(partlabel: &str) -> Result<String, ExecCommandError> {
     let out = Command::new("/usr/bin/blkid")
         .args([
+            "--probe",
             "-s",
             "PARTLABEL",
             "--match-token",
@@ -138,6 +139,19 @@ pub fn find_partlabel(partlabel: &str) -> Result<String, ExecCommandError> {
     }
 }
 
+
+pub fn list_partlabel() -> Result<String, ExecCommandError> {
+    let out = Command::new("/usr/bin/blkid")
+        .args(["--probe", "-s", "PARTLABEL"])
+        .output()?;
+    if out.status.success() {
+        let out_text = String::from_utf8(out.stdout)?;
+        Ok(out_text)
+    } else {
+        Err(ExecCommandError::Other("Oh no".to_string()))
+    }
+}
+
 /// exec given command with arguments, returning stdout parsed to UTF-8 string
 /// capturing stderr in case or failure
 // pub fn exec_command_out(cmd: &str, args: &Vec<&str>) -> Result<String, ExecCommandError> {