Using blkid utility to determine dev name by gpt partlabel.

src/nyan_system.rs

@@ -110,6 +110,34 @@ pub fn exec_command(cmd: &str, args: &Vec<&str>) -> Result<(), ExecCommandError>
     }
 }
 
+/// Gets device node aka /dev/sda1 from gpr partition label
+/// blkid -s PARTLABEL --match-token "PARTLABEL=primary"
+pub fn find_partlabel(partlabel: &str) -> Result<String, ExecCommandError> {
+    let out = Command::new("/usr/bin/blkid")
+        .args([
+            "-s",
+            "PARTLABEL",
+            "--match-token",
+            format!("\"PARTLABEL={}\"", partlabel).as_str(),
+        ])
+        .output()?;
+    if out.status.success() {
+        let out_text = String::from_utf8(out.stdout)?;
+
+        let split_res = out_text.split_once(':').ok_or_else(|| {
+            ExecCommandError::Other(format!("Unexpected blkid output format: \"{}\"", out_text))
+        })?;
+
+        Ok(split_res.0.to_string())
+    } else {
+        Err(ExecCommandError::Other(format!(
+            "Connot find device with partlabel={} or something other is wrong: \"{}\"",
+            partlabel,
+            String::from_utf8(out.stderr).unwrap_or_else(|_| String::new())
+        )))
+    }
+}
+
 /// 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> {
@@ -224,7 +252,7 @@ pub fn list_bzzpss_snaps(snaps_dir: &str) -> Result<Vec<String>, ExecCommandErro
 // mount -t sysfs none /sys
 // modprobe bcachefs
 pub fn prepare_env() -> Result<(), String> {
-    use nix::mount::{mount, MsFlags};
+    use nix::mount::{MsFlags, mount};
 
     use std::path::Path;