142 lines
3.4 KiB
Go
142 lines
3.4 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"
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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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"interpreter": &schema.Schema{
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Type: schema.TypeList,
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Elem: &schema.Schema{Type: schema.TypeString},
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Optional: true,
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},
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"working_dir": &schema.Schema{
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Type: schema.TypeString,
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Optional: 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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interpreter := data.Get("interpreter").([]interface{})
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var cmdargs []string
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if len(interpreter) > 0 {
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for _, i := range interpreter {
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if arg, ok := i.(string); ok {
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cmdargs = append(cmdargs, arg)
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}
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}
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} else {
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if runtime.GOOS == "windows" {
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cmdargs = []string{"cmd", "/C"}
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} else {
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cmdargs = []string{"/bin/sh", "-c"}
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}
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}
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cmdargs = append(cmdargs, command)
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workingdir := data.Get("working_dir").(string)
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// Setup the reader that will read the output from the command.
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// We use an os.Pipe so that the *os.File can be passed directly to the
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// process, and not rely on goroutines copying the data which may block.
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// See golang.org/issue/18874
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pr, pw, err := os.Pipe()
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if err != nil {
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return fmt.Errorf("failed to initialize pipe for output: %s", err)
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}
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// Setup the command
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cmd := exec.CommandContext(ctx, cmdargs[0], cmdargs[1:]...)
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cmd.Stderr = pw
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cmd.Stdout = pw
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// Dir specifies the working directory of the command.
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// If Dir is the empty string (this is default), runs the command
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// in the calling process's current directory.
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cmd.Dir = workingdir
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output, _ := circbuf.NewBuffer(maxBufSize)
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// Write everything we read from the pipe to the output buffer too
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tee := io.TeeReader(pr, output)
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// copy the teed output to the UI output
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copyDoneCh := make(chan struct{})
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go copyOutput(o, tee, copyDoneCh)
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// Output what we're about to run
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o.Output(fmt.Sprintf("Executing: %q", cmdargs))
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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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err = cmd.Wait()
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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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// Cancelling the command may block the pipe reader if the file descriptor
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// was passed to a child process which hasn't closed it. In this case the
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// copyOutput goroutine will just hang out until exit.
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select {
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case <-copyDoneCh:
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case <-ctx.Done():
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}
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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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