proxmox: use noop provider if no configdrive

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

src/metadata.rs

@@ -33,7 +33,7 @@ use crate::providers::openstack;
 use crate::providers::openstack::network::OpenstackProviderNetwork;
 use crate::providers::packet::PacketProvider;
 use crate::providers::powervs::PowerVSProvider;
-use crate::providers::proxmoxve::ProxmoxVEConfigDrive;
+use crate::providers::proxmoxve;
 use crate::providers::scaleway::ScalewayProvider;
 use crate::providers::vmware::VmwareProvider;
 use crate::providers::vultr::VultrProvider;
@@ -71,7 +71,7 @@ pub fn fetch_metadata(provider: &str) -> Result<Box<dyn providers::MetadataProvi
         "openstack-metadata" => box_result!(OpenstackProviderNetwork::try_new()?),
         "packet" => box_result!(PacketProvider::try_new()?),
         "powervs" => box_result!(PowerVSProvider::try_new()?),
-        "proxmoxve" => box_result!(ProxmoxVEConfigDrive::try_new()?),
+        "proxmoxve" => proxmoxve::try_config_drive_else_leave(),
         "scaleway" => box_result!(ScalewayProvider::try_new()?),
         "vmware" => box_result!(VmwareProvider::try_new()?),
         "vultr" => box_result!(VultrProvider::try_new()?),

src/providers/mod.rs

@@ -35,6 +35,7 @@ pub mod ibmcloud;
 pub mod ibmcloud_classic;
 pub mod kubevirt;
 pub mod microsoft;
+pub mod noop;
 pub mod openstack;
 pub mod packet;
 pub mod powervs;

src/providers/proxmoxve/mod.rs

@@ -12,6 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use anyhow::Result;
+use crate::providers;
+use crate::providers::noop::NoopProvider;
+use slog_scope::warn;
+
 mod configdrive;
 pub use configdrive::*;
 
@@ -20,3 +25,12 @@ pub use cloudconfig::*;
 
 #[cfg(test)]
 mod tests;
+
+pub fn try_config_drive_else_leave() -> Result<Box<dyn providers::MetadataProvider>> {
+    if let Ok(config_drive) = ProxmoxVEConfigDrive::try_new() {
+        Ok(Box::new(config_drive))
+    } else {
+        warn!("failed to locate config-drive - aborting ProxmoxVE provider");
+        Ok(Box::new(NoopProvider::try_new()?))
+    }
+}