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* [pbs-devel] [PATCH proxmox-backup 01/11] tape/drive: add test_device_path_lock
@ 2021-02-18 14:40 Dominik Csapak
  2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 02/11] tape/drive: add get/set status functions Dominik Csapak
                   ` (9 more replies)
  0 siblings, 10 replies; 12+ messages in thread
From: Dominik Csapak @ 2021-02-18 14:40 UTC (permalink / raw)
  To: pbs-devel

this makes it possible to detect if the drive was locked in a
non-blocking manner

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
 src/tape/drive/mod.rs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/tape/drive/mod.rs b/src/tape/drive/mod.rs
index e44e0e36..faa89953 100644
--- a/src/tape/drive/mod.rs
+++ b/src/tape/drive/mod.rs
@@ -496,3 +496,28 @@ fn lock_device_path(device_path: &str) -> Result<DeviceLockGuard, Error> {
 
     Ok(DeviceLockGuard(file))
 }
+
+// Same logic as lock_device_path, but uses a timeout of 0, making it
+// non-blocking, and returning if the file is locked or not
+fn test_device_path_lock(device_path: &str) -> Result<bool, Error> {
+
+    let lock_name = crate::tools::systemd::escape_unit(device_path, true);
+
+    let mut path = std::path::PathBuf::from("/var/lock");
+    path.push(lock_name);
+
+    let timeout = std::time::Duration::new(0, 0);
+    let mut file = std::fs::OpenOptions::new().create(true).append(true).open(path)?;
+    match proxmox::tools::fs::lock_file(&mut file, true, Some(timeout)) {
+        // file was not locked, continue
+        Ok(()) => {},
+        // file was locked, return true
+        Err(err) if err.kind() == std::io::ErrorKind::WouldBlock => return Ok(true),
+        Err(err) => bail!("{}", err),
+    }
+
+    let backup_user = crate::backup::backup_user()?;
+    fchown(file.as_raw_fd(), Some(backup_user.uid), Some(backup_user.gid))?;
+
+    Ok(false)
+}
-- 
2.20.1





^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2021-02-18 15:06 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-02-18 14:40 [pbs-devel] [PATCH proxmox-backup 01/11] tape/drive: add test_device_path_lock Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 02/11] tape/drive: add get/set status functions Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 03/11] api2/tape/drive: add run_drive_worker wrapper Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 04/11] api2/tape/drive: use 'run_drive_worker' where possible Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 05/11] api2/tape/drive: add wrapper for tokio::task::spawn_blocking Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 06/11] api2/tape/drive: use run_drive_blocking_task where possible Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 07/11] api2/tape/drive: wrap some api calls in run_drive_blocking_task Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 08/11] api2/tape/changer: add drive state to changer status output Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 09/11] api2/tape/{backup, restore}, proxmox-tape: set device state Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 10/11] ui: tape: fix eslint warnings (trailing comma) Dominik Csapak
2021-02-18 14:40 ` [pbs-devel] [PATCH proxmox-backup 11/11] ui: tape/ChangerStatus: show the state of the drive Dominik Csapak
2021-02-18 15:06   ` Dominik Csapak

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