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109 lines
3.4 KiB
109 lines
3.4 KiB
/*
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Copyright The Helm 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 postrender
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import (
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"bytes"
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"io"
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"os/exec"
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"path/filepath"
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"github.com/pkg/errors"
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)
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type execRender struct {
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binaryPath string
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}
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// NewExec returns a PostRenderer implementation that calls the provided binary.
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// It returns an error if the binary cannot be found. If the path does not
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// contain any separators, it will search in $PATH, otherwise it will resolve
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// any relative paths to a fully qualified path
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func NewExec(binaryPath string) (PostRenderer, error) {
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fullPath, err := getFullPath(binaryPath)
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if err != nil {
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return nil, err
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}
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return &execRender{fullPath}, nil
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}
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// Run the configured binary for the post render
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func (p *execRender) Run(renderedManifests *bytes.Buffer) (*bytes.Buffer, error) {
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cmd := exec.Command(p.binaryPath)
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stdin, err := cmd.StdinPipe()
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if err != nil {
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return nil, err
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}
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var postRendered = &bytes.Buffer{}
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var stderr = &bytes.Buffer{}
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cmd.Stdout = postRendered
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cmd.Stderr = stderr
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go func() {
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defer stdin.Close()
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io.Copy(stdin, renderedManifests)
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}()
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err = cmd.Run()
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if err != nil {
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return nil, errors.Wrapf(err, "error while running command %s. error output:\n%s", p.binaryPath, stderr.String())
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}
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return postRendered, nil
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}
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// getFullPath returns the full filepath to the binary to execute. If the path
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// does not contain any separators, it will search in $PATH, otherwise it will
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// resolve any relative paths to a fully qualified path
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func getFullPath(binaryPath string) (string, error) {
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// NOTE(thomastaylor312): I am leaving this code commented out here. During
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// the implementation of post-render, it was brought up that if we are
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// relying on plugins, we should actually use the plugin system so it can
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// properly handle multiple OSs. This will be a feature add in the future,
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// so I left this code for reference. It can be deleted or reused once the
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// feature is implemented
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// Manually check the plugin dir first
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// if !strings.Contains(binaryPath, string(filepath.Separator)) {
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// // First check the plugin dir
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// pluginDir := helmpath.DataPath("plugins") // Default location
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// // If location for plugins is explicitly set, check there
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// if v, ok := os.LookupEnv("HELM_PLUGINS"); ok {
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// pluginDir = v
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// }
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// // The plugins variable can actually contain multiple paths, so loop through those
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// for _, p := range filepath.SplitList(pluginDir) {
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// _, err := os.Stat(filepath.Join(p, binaryPath))
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// if err != nil && !os.IsNotExist(err) {
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// return "", err
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// } else if err == nil {
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// binaryPath = filepath.Join(p, binaryPath)
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// break
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// }
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// }
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// }
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// Now check for the binary using the given path or check if it exists in
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// the path and is executable
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checkedPath, err := exec.LookPath(binaryPath)
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if err != nil {
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return "", errors.Wrapf(err, "unable to find binary at %s", binaryPath)
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}
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return filepath.Abs(checkedPath)
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}
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