tape: pmt - re-implement lock/unlock command

src/bin/pmt.rs

@@ -577,8 +577,7 @@ fn lock(param: Value) -> Result<(), Error> {
 
     let mut handle = get_tape_handle(&param)?;
 
-    unimplemented!();
-    // fixme: handle.mtop(MTCmd::MTLOCK, 1, "lock tape drive door")?;
+    handle.lock()?;
 
     Ok(())
 }
@@ -715,8 +714,7 @@ fn unlock(param: Value) -> Result<(), Error> {
 
     let mut handle = get_tape_handle(&param)?;
 
-    unimplemented!();
-    //handle.mtop(MTCmd::MTUNLOCK, 1, "unlock tape drive door")?;
+    handle.unlock()?;
 
     Ok(())
 }

src/tape/drive/lto/mod.rs

@@ -220,6 +220,18 @@ impl LtoTapeHandle {
     pub fn volume_statistics(&mut self) -> Result<Lp17VolumeStatistics, Error> {
         self.sg_tape.volume_statistics()
     }
+
+    /// Lock the drive door
+    pub fn lock(&mut self) -> Result<(), Error>  {
+        self.sg_tape.set_medium_removal(false)
+            .map_err(|err| format_err!("lock door failed - {}", err))
+    }
+
+    /// Unlock the drive door
+    pub fn unlock(&mut self) -> Result<(), Error>  {
+        self.sg_tape.set_medium_removal(true)
+            .map_err(|err| format_err!("unlock door failed - {}", err))
+    }
 }
 
 

src/tape/drive/lto/sg_tape.rs

@@ -189,6 +189,25 @@ impl SgTape {
         Ok(())
     }
 
+    /// Lock/Unlock drive door
+    pub fn set_medium_removal(&mut self, allow: bool) -> Result<(), ScsiError> {
+
+        let mut sg_raw = SgRaw::new(&mut self.file, 16)?;
+        sg_raw.set_timeout(Self::SCSI_TAPE_DEFAULT_TIMEOUT);
+        let mut cmd = Vec::new();
+        cmd.extend(&[0x1E, 0, 0, 0]);
+        if allow {
+            cmd.push(0);
+        } else {
+            cmd.push(1);
+        }
+        cmd.push(0); // control
+
+        sg_raw.do_command(&cmd)?;
+
+        Ok(())
+    }
+
     pub fn rewind(&mut self) -> Result<(), Error> {
 
         let mut sg_raw = SgRaw::new(&mut self.file, 16)?;