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// Copyright 2022 Canonical Ltd.
// Licensed under the LGPLv3 with static-linking exception.
// See LICENCE file for details.
package linux
import (
"fmt"
"regexp"
)
// vmbusrootRE matches a VMBUS:XX component.
var vmbusrootRE = regexp.MustCompile(`^VMBUS:[[:xdigit:]]{2}$`)
func handleVMBusRootDevicePathNode(state *devicePathBuilderState) error {
if !vmbusrootRE.MatchString(state.PeekUnhandledSysfsComponents(1)) {
return errSkipDevicePathNodeHandler
}
state.AdvanceSysfsPath(1)
node, err := newACPIExtendedDevicePathNode(state.SysfsPath())
if err != nil {
return err
}
if node.HID != 0 || node.CID != 0 || node.HIDStr != "VMBUS" || node.CIDStr != "" {
return fmt.Errorf("unexpected node properties: %v", node)
}
// The hardware ID exposed by the kernel seems to be capitalized, but the
// one exposed from the firmware on an instance I've tested on isn't. Fix
// up here - I'm not sure if this is right (is it always "VMBus"?), but the
// device path does need to be an exact match for lookups because the firmware
// essentially just does a memcmp.
node.HIDStr = "VMBus"
state.Interface = interfaceTypeVMBus
state.Path = append(state.Path, maybeUseSimpleACPIDevicePathNode(node))
return nil
}
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