fix: setdir in CNI client (#2027)

so invoking from inside the CNS Pod works on Windows

Signed-off-by: Evan Baker <rbtr@users.noreply.github.com>

cni/client/client.go

@@ -14,12 +14,6 @@ import (
 	utilexec "k8s.io/utils/exec"
 )
 
-type Client interface {
-	GetEndpointState() (*api.AzureCNIState, error)
-}
-
-var _ (Client) = (*client)(nil)
-
 type client struct {
 	exec utilexec.Interface
 }
@@ -30,7 +24,7 @@ func New(exec utilexec.Interface) *client {
 
 func (c *client) GetEndpointState() (*api.AzureCNIState, error) {
 	cmd := c.exec.Command(platform.CNIBinaryPath)
-
+	cmd.SetDir(CNIExecDir)
 	envs := os.Environ()
 	cmdenv := fmt.Sprintf("%s=%s", cni.Cmd, cni.CmdGetEndpointsState)
 	log.Printf("Setting cmd to %s", cmdenv)
@@ -52,7 +46,7 @@ func (c *client) GetEndpointState() (*api.AzureCNIState, error) {
 
 func (c *client) GetVersion() (*semver.Version, error) {
 	cmd := c.exec.Command(platform.CNIBinaryPath, "-v")
-
+	cmd.SetDir(CNIExecDir)
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		return nil, fmt.Errorf("failed to get Azure CNI version with err: [%w], output: [%s]", err, string(output))

cni/client/const_linux.go

@@ -0,0 +1,7 @@
+package client
+
+// CNIExecDir is the working directory that the invoker must execute the CNI from
+// in order for it to correctly map its state and lock files.
+// Does not need to be set on Linux, as absolute paths are correctly used during
+// the actual CNI execution.
+const CNIExecDir = ""

cni/client/const_windows.go

@@ -0,0 +1,6 @@
+package client
+
+// CNIExecDir is the working directory that the invoker must execute the CNI from
+// in order for it to correctly map its state and lock files.
+// Only needs to be set on Windows.
+const CNIExecDir = "C:\\k"