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// Copyright 2021 Canonical Ltd.
// Licensed under the LGPLv3 with static-linking exception.
// See LICENCE file for details.
package linux
import (
"errors"
"fmt"
"os"
"path/filepath"
"regexp"
"strconv"
efi "github.com/canonical/go-efilib"
)
// nvmeNSRe matches "nvme/nvme<ctrl_id>/nvme<ctrl_id>n<ns_id>", capturing ns_id
var nvmeNSRe = regexp.MustCompile(`^nvme\/nvme[[:digit:]]+\/nvme[[:digit:]]+n([[:digit:]]+)$`)
func handleNVMEDevicePathNode(state *devicePathBuilderState) error {
if state.SysfsComponentsRemaining() < 3 {
return errors.New("invalid path: not enough components")
}
components := state.PeekUnhandledSysfsComponents(3)
m := nvmeNSRe.FindStringSubmatch(components)
if len(m) == 0 {
return errors.New("invalid path")
}
state.AdvanceSysfsPath(3)
nsid, err := strconv.ParseUint(m[1], 10, 32)
if err != nil {
return fmt.Errorf("cannot parse nsid: %w", err)
}
var euid efi.EUI64
euidBuf, err := os.ReadFile(filepath.Join(state.SysfsPath(), "eui"))
if os.IsNotExist(err) {
euidBuf, err = os.ReadFile(filepath.Join(state.SysfsPath(), "device", "eui"))
}
switch {
case os.IsNotExist(err):
// Nothing to do
case err != nil:
return fmt.Errorf("cannot determine euid: %w", err)
default:
n, err := fmt.Sscanf(string(euidBuf), "%02x %02x %02x %02x %02x %02x %02x %02x",
&euid[0], &euid[1], &euid[2], &euid[3], &euid[4], &euid[5], &euid[6], &euid[7])
if err != nil {
return fmt.Errorf("cannot parse euid: %w", err)
}
if n != 8 {
return errors.New("invalid euid")
}
}
state.Path = append(state.Path, &efi.NVMENamespaceDevicePathNode{
NamespaceID: uint32(nsid),
NamespaceUUID: euid})
return nil
}
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