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packer: Better docs for communicator interface

This commit is contained in:
Mitchell Hashimoto 2013-06-20 14:46:25 -07:00
parent 25afaf8317
commit 957ebe9234
1 changed files with 13 additions and 0 deletions
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13
packer/communicator.go
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@ -39,8 +39,21 @@ type RemoteCmd struct {
// Communicators must be safe for concurrency, meaning multiple calls to
// Start or any other method may be called at the same time.
type Communicator interface {
// Start takes a RemoteCmd and starts it. The RemoteCmd must not be
// modified after being used with Start, and it must not be used with
// Start again. The Start method returns immediately once the command
// is started. It does not wait for the command to complete. The
// RemoteCmd.Exited field should be used for this.
Start(*RemoteCmd) error
// Upload uploads a file to the machine to the given path with the
// contents coming from the given reader. This method will block until
// it completes.
Upload(string, io.Reader) error
// Download downloads a file from the machine from the given remote path
// with the contents writing to the given writer. This method will
// block until it completes.
Download(string, io.Writer) error
}