[pbs-devel] [PATCH proxmox-backup v3 05/24] add helper for checking if a removable datastore is available

[Hannes Laimer <h.laimer@proxmox.com>]

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 pbs-datastore/src/datastore.rs | 18 ++++++++++++++++++
 pbs-datastore/src/lib.rs       |  2 +-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index 0685cc84..db47205c 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -49,6 +49,22 @@ pub fn check_backup_owner(owner: &Authid, auth_id: &Authid) -> Result<(), Error>
     Ok(())
 }
 
+pub fn check_if_available(config: &DataStoreConfig) -> Result<(), Error> {
+    config.backing_device.as_ref().map_or(Ok(()), |uuid| {
+        let mut command = std::process::Command::new("findmnt");
+        command.args(["-n", "-o", "TARGET", "--source", &format!("UUID={uuid}")]);
+
+        match proxmox_sys::command::run_command(command, None) {
+            Ok(mount_point) if mount_point.trim_end() == config.path => Ok(()),
+            _ => Err(format_err!(
+                "device for datastore '{}' has to be mounted at '{}'",
+                config.name,
+                config.path
+            )),
+        }
+    })
+}
+
 /// Datastore Management
 ///
 /// A Datastore can store severals backups, and provides the
@@ -261,6 +277,8 @@ impl DataStore {
     ) -> Result<Arc<Self>, Error> {
         let name = config.name.clone();
 
+        check_if_available(&config)?;
+
         let tuning: DatastoreTuning = serde_json::from_value(
             DatastoreTuning::API_SCHEMA
                 .parse_property_string(config.tuning.as_deref().unwrap_or(""))?,
diff --git a/pbs-datastore/src/lib.rs b/pbs-datastore/src/lib.rs
index 43050162..f5e93e92 100644
--- a/pbs-datastore/src/lib.rs
+++ b/pbs-datastore/src/lib.rs
@@ -206,7 +206,7 @@ pub use manifest::BackupManifest;
 pub use store_progress::StoreProgress;
 
 mod datastore;
-pub use datastore::{check_backup_owner, DataStore};
+pub use datastore::{check_backup_owner, check_if_available, DataStore};
 
 mod hierarchy;
 pub use hierarchy::{
-- 
2.39.2