hashicorp/nomad · error

Error formatting CSI volume: %w

Error message

Error formatting CSI volume: %w

What it means

Once the full CSIVolume is retrieved, formatCSIBasic renders it for terminal output. If formatting fails, the error is wrapped as `Error formatting CSI volume`. This isolates rendering failures (rare, typically internal or formatting-option related) from API failures.

Source

Thrown at command/volume_status_csi.go:50

		return fmt.Errorf("Error listing CSI volumes: %w", err)
	}
	if len(possible) > 0 {
		out, err := csiFormatVolumes(possible, c.json, c.template)
		if err != nil {
			return fmt.Errorf("Error formatting: %w", err)
		}
		return fmt.Errorf("Prefix matched multiple CSI volumes\n\n%s", out)
	}

	// Try querying the volume
	vol, _, err := client.CSIVolumes().Info(volStub.ID, nil)
	if err != nil {
		return fmt.Errorf("Error querying CSI volume: %w", err)
	}

	str, err := c.formatCSIBasic(vol)
	if err != nil {
		return fmt.Errorf("Error formatting CSI volume: %w", err)
	}
	c.Ui.Output(str)
	return nil
}

func (c *VolumeStatusCommand) csiVolumesList(client *api.Client, opts formatOpts) error {

	if !(opts.json || len(opts.template) > 0) {
		c.Ui.Output(c.Colorize().Color("[bold]Container Storage Interface[reset]"))
	}

	vols, _, err := client.CSIVolumes().List(nil)
	if err != nil {
		return fmt.Errorf("Error querying CSI volumes: %w", err)
	}

	if len(vols) == 0 {
		c.Ui.Error("No CSI volumes")

View on GitHub (pinned to 482b49bf1a)

Solutions

1. Retry with -json or -t '{{.}}' to bypass the default formatter and inspect the raw object.
2. Align CLI and server versions (nomad version) to avoid format incompatibilities.
3. Check the CSI plugin health (`nomad plugin status`) — a malformed volume record may need re-registration.

Example fix

// before
nomad volume status my-vol
// after
nomad volume status my-vol -json

// fall back to raw output if the formatter fails
// verify CLI/server versions match
if cliVer != serverVer { warn("version skew may break formatting") }

str, err := c.formatCSIBasic(vol)
if err != nil {
	// fallback to JSON dump
	if b, jerr := json.Marshal(vol); jerr == nil {
		c.Ui.Output(string(b)); return nil
	}
	return fmt.Errorf("Error formatting CSI volume: %w", err)
}

When it happens

Trigger: `nomad volume status <id>` where the internal formatter returns an error for the retrieved volume object — typically unexpected/missing fields or a rendering failure in the formatting helper.

Common situations: Version skew between CLI and server producing a volume payload the formatter does not expect; corrupted response fields from a misbehaving CSI plugin.

Related errors

• error parsing: root should be an object
• invalid capacity_min: %v
• invalid capacity_max: %v
• Error formatting: %w
• Prefix matched multiple CSI volumes %s

AI-assisted analysis of hashicorp/nomad@482b49bf1a (2026-09-04). Data as JSON: /api/errors/9e8a77ed8e4c1c86. Report an issue: GitHub.