mirror of
https://github.com/kubernetes-sigs/kustomize.git
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60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package diff
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import (
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"io"
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"os"
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"k8s.io/utils/exec"
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)
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// program wraps the system diff program.
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// If specified, the value of KUBERNETES_EXTERNAL_DIFF environment variable
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// will be used instead of simply `diff(1)`.
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type program struct {
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stdout io.Writer
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stderr io.Writer
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}
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func newProgram(out, errOut io.Writer) *program {
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return &program{
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stdout: out,
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stderr: errOut,
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}
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}
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func (d *program) makeCommand(args ...string) exec.Cmd {
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diff := ""
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if envDiff := os.Getenv("KUBERNETES_EXTERNAL_DIFF"); envDiff != "" {
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diff = envDiff
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} else {
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diff = "diff"
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args = append([]string{"-u", "-N"}, args...)
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}
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cmd := exec.New().Command(diff, args...)
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cmd.SetStdout(d.stdout)
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cmd.SetStderr(d.stderr)
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return cmd
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}
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// run runs the detected diff program. `from` and `to` are the directory to diff.
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func (d *program) run(from, to string) error {
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d.makeCommand(from, to).Run() // Ignore diff return code
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return nil
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}
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