terraform/builtin/provisioners/file/resource_provisioner.go

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package file
import (
"fmt"
"log"
"os"
"time"
"github.com/hashicorp/terraform/communicator"
"github.com/hashicorp/terraform/helper/config"
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"github.com/hashicorp/terraform/terraform"
"github.com/mitchellh/go-homedir"
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)
// ResourceProvisioner represents a file provisioner
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type ResourceProvisioner struct{}
// Apply executes the file provisioner
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func (p *ResourceProvisioner) Apply(
o terraform.UIOutput,
s *terraform.InstanceState,
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c *terraform.ResourceConfig) error {
// Get a new communicator
comm, err := communicator.New(s)
if err != nil {
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return err
}
// Get the source and destination
sRaw := c.Config["source"]
src, ok := sRaw.(string)
if !ok {
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return fmt.Errorf("Unsupported 'source' type! Must be string.")
}
src, err = homedir.Expand(src)
if err != nil {
return err
}
dRaw := c.Config["destination"]
dst, ok := dRaw.(string)
if !ok {
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return fmt.Errorf("Unsupported 'destination' type! Must be string.")
}
return p.copyFiles(comm, src, dst)
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}
// Validate checks if the required arguments are configured
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func (p *ResourceProvisioner) Validate(c *terraform.ResourceConfig) (ws []string, es []error) {
v := &config.Validator{
Required: []string{
"source",
"destination",
},
}
return v.Validate(c)
}
// copyFiles is used to copy the files from a source to a destination
func (p *ResourceProvisioner) copyFiles(comm communicator.Communicator, src, dst string) error {
// Wait and retry until we establish the connection
err := retryFunc(comm.Timeout(), func() error {
err := comm.Connect(nil)
return err
})
if err != nil {
return err
}
defer comm.Disconnect()
info, err := os.Stat(src)
if err != nil {
return err
}
// If we're uploading a directory, short circuit and do that
if info.IsDir() {
if err := comm.UploadDir(dst, src, nil); err != nil {
return fmt.Errorf("Upload failed: %v", err)
}
return nil
}
// We're uploading a file...
f, err := os.Open(src)
if err != nil {
return err
}
defer f.Close()
err = comm.Upload(dst, f)
if err != nil {
return fmt.Errorf("Upload failed: %v", err)
}
return err
}
// retryFunc is used to retry a function for a given duration
func retryFunc(timeout time.Duration, f func() error) error {
finish := time.After(timeout)
for {
err := f()
if err == nil {
return nil
}
log.Printf("Retryable error: %v", err)
select {
case <-finish:
return err
case <-time.After(3 * time.Second):
}
}
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}