Added a flag to query host OSDs only

Signed-off-by: Utkarsh Bhatt <utkarsh.bhatt@canonical.com>

microceph/cmd/microceph/disk_list.go

@@ -22,9 +22,10 @@ import (
 )
 
 type cmdDiskList struct {
-	common *CmdControl
-	disk   *cmdDisk
-	json   bool
+	common   *CmdControl
+	disk     *cmdDisk
+	json     bool
+	hostOnly bool
 }
 
 func (c *cmdDiskList) Command() *cobra.Command {
@@ -35,6 +36,7 @@ func (c *cmdDiskList) Command() *cobra.Command {
 	}
 
 	cmd.PersistentFlags().BoolVar(&c.json, "json", false, "Provide output as Json encoded string.")
+	cmd.PersistentFlags().BoolVar(&c.hostOnly, "host-only", false, "Output only the disks configured on current host.")
 	return cmd
 }
 
@@ -74,6 +76,25 @@ func (c *cmdDiskList) Run(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("internal error: unable to fetch unpartitoned disks: %w", err)
 	}
 
+	if c.hostOnly {
+		fcg := types.Disks{}
+
+		// Get system hostname.
+		hostname, err := os.Hostname()
+		if err != nil {
+			return fmt.Errorf("failed to retrieve system hostname: %w", err)
+		}
+
+		for _, disk := range configuredDisks {
+			if disk.Location == hostname {
+				fcg = append(fcg, disk)
+			}
+		}
+
+		// Overwrite configured disks with the filtered disks.
+		configuredDisks = fcg
+	}
+
 	if c.json {
 		return outputJson(configuredDisks, availableDisks)
 	}