csi: allow volume detach to take a node ID prefix

Fixes a bug where the `nomad volume detach` command would not accept a node ID
prefix instead of a full node ID. The volume ID is already prefix matched
server-side.

CHANGELOG.md

@@ -20,6 +20,7 @@ BUG FIXES:
 
  * core: Fixed a bug where blocking queries would not include the query's maximum wait time when calculating whether it was safe to retry. [[GH-8921](https://github.com/hashicorp/nomad/issues/8921)]
  * consul: Fixed a bug to correctly validate task when using script-checks in group-level services [[GH-8952](https://github.com/hashicorp/nomad/issues/8952)]
+ * csi: Fixed a bug where `nomad volume detach` would not accept prefixes for the node ID parameter. [[GH-9041](https://github.com/hashicorp/nomad/issues/9041)]
 
 ## 0.12.5 (September 17, 2020)
 

command/volume_detach.go

@@ -87,7 +87,24 @@ func (c *VolumeDetachCommand) Run(args []string) int {
 		return 1
 	}
 
-	err = client.CSIVolumes().Detach(volID, nodeID, nil)
+	nodeID = sanitizeUUIDPrefix(nodeID)
+	nodes, _, err := client.Nodes().PrefixList(nodeID)
+	if err != nil {
+		c.Ui.Error(fmt.Sprintf("Error detaching volume: %s", err))
+		return 1
+	}
+	// Return error if no nodes are found
+	if len(nodes) == 0 {
+		c.Ui.Error(fmt.Sprintf("No node(s) with prefix or id %q found", nodeID))
+		return 1
+	}
+	if len(nodes) > 1 {
+		c.Ui.Error(fmt.Sprintf("Prefix matched multiple nodes\n\n%s",
+			formatNodeStubList(nodes, true)))
+		return 1
+	}
+
+	err = client.CSIVolumes().Detach(volID, nodes[0].ID, nil)
 	if err != nil {
 		c.Ui.Error(fmt.Sprintf("Error detaching volume: %s", err))
 		return 1