terraform/builtin/provisioners/local-exec/resource_provisioner.go

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