109 lines
2.4 KiB
Go
109 lines
2.4 KiB
Go
package localexec
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import (
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"context"
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"fmt"
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"io"
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"os/exec"
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"runtime"
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"github.com/armon/circbuf"
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"github.com/hashicorp/terraform/helper/schema"
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"github.com/hashicorp/terraform/terraform"
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"github.com/mitchellh/go-linereader"
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)
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const (
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// maxBufSize limits how much output we collect from a local
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// invocation. This is to prevent TF memory usage from growing
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// to an enormous amount due to a faulty process.
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maxBufSize = 8 * 1024
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)
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func Provisioner() terraform.ResourceProvisioner {
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return &schema.Provisioner{
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Schema: map[string]*schema.Schema{
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"command": &schema.Schema{
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Type: schema.TypeString,
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Required: true,
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},
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},
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ApplyFunc: applyFn,
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}
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}
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func applyFn(ctx context.Context) error {
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data := ctx.Value(schema.ProvConfigDataKey).(*schema.ResourceData)
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o := ctx.Value(schema.ProvOutputKey).(terraform.UIOutput)
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command := data.Get("command").(string)
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if command == "" {
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return fmt.Errorf("local-exec provisioner command must be a non-empty string")
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}
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// Execute the command using a shell
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var shell, flag string
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if runtime.GOOS == "windows" {
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shell = "cmd"
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flag = "/C"
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} else {
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shell = "/bin/sh"
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flag = "-c"
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}
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// Setup the reader that will read the lines from the command
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pr, pw := io.Pipe()
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copyDoneCh := make(chan struct{})
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go copyOutput(o, pr, copyDoneCh)
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// Setup the command
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cmd := exec.Command(shell, flag, command)
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output, _ := circbuf.NewBuffer(maxBufSize)
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cmd.Stderr = io.MultiWriter(output, pw)
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cmd.Stdout = io.MultiWriter(output, pw)
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// Output what we're about to run
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o.Output(fmt.Sprintf(
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"Executing: %s %s \"%s\"",
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shell, flag, command))
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// Start the command
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err := cmd.Start()
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if err == nil {
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// Wait for the command to complete in a goroutine
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doneCh := make(chan error, 1)
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go func() {
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doneCh <- cmd.Wait()
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}()
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// Wait for the command to finish or for us to be interrupted
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select {
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case err = <-doneCh:
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case <-ctx.Done():
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cmd.Process.Kill()
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err = cmd.Wait()
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}
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}
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// Close the write-end of the pipe so that the goroutine mirroring output
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// ends properly.
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pw.Close()
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<-copyDoneCh
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if err != nil {
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return fmt.Errorf("Error running command '%s': %v. Output: %s",
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command, err, output.Bytes())
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}
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return nil
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}
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func copyOutput(o terraform.UIOutput, r io.Reader, doneCh chan<- struct{}) {
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defer close(doneCh)
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lr := linereader.New(r)
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for line := range lr.Ch {
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o.Output(line)
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}
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}
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