// Copyright Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,

func readConfigFile(filename string) ([]byte, error) {
	file := os.Stdin
	if filename != "-" {
		var err error
		file, err = os.Open(filename)
		if err != nil {
			return nil, err
		}
	}
	defer func() {
		if err := file.Close(); err != nil {
			log.Errorf("failed to close %s: %s", filename, err)
		}
	}()
	data, err := io.ReadAll(file)
	if err != nil {
		return nil, err
	}
	return data, nil
}

		return ""
	}
	return "\033[0m"
}

func IstioctlColorDefault(writer io.Writer) bool {
	if strings.EqualFold(termEnvVar.Get(), "dumb") {
		return false
	}

	file, ok := writer.(*os.File)
	if ok {
		if !isatty.IsTerminal(file.Fd()) {
			return false
		}
	}

	return true

// in a pod, we cannot just access any arbitrary file they happen to bind mount in, as we don't know ahead of time where
// it might be.
//
// Instead, we rely directly on the procfs.
// This rules out two possible methods:
// * use crictl to inspect the pod; this returns the bind-mounted network namespace file.

			"e.g. Service:*:istiod->Service:*:istio-control - rename istiod service into istio-control")
}

func manifestDiffCmd(diffArgs *manifestDiffArgs) *cobra.Command {
	cmd := &cobra.Command{
		Use:   "diff <file|dir> <file|dir>",
		Short: "Compare manifests and generate diff",
		Long: "The diff subcommand compares manifests from two files or directories. The output is a list of\n" +

// Copyright Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,

			no := o.DeepCopy()
			out = append(out, object.NewK8sObject(no, nil, nil))
		}
	}
	return out
}

// readFile reads a file and returns the contents.
func readFile(path string) (string, error) {
	b, err := os.ReadFile(path)
	return string(b), err
}

// writeFile writes a file and returns an error if operation is unsuccessful.
func writeFile(path string, data []byte) error {
	return os.WriteFile(path, data, 0o644)

			expectedOutput:    "Error: expecting a WorkloadGroup artifact file or the name and namespace of an existing WorkloadGroup\n",
		},
		{
			description:       "Invalid command args - missing valid input spec",
			args:              strings.Split("entry configure -n bar -o temp --clusterID cid", " "),
			expectedException: true,
			expectedOutput:    "Error: expecting a WorkloadGroup artifact file or the name and namespace of an existing WorkloadGroup\n",

// Copyright Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,

//go:build !linux
// +build !linux

// Copyright Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,