mirror of https://github.com/knative/func.git
54 lines
1.3 KiB
Go
54 lines
1.3 KiB
Go
package docker
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import (
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"bytes"
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"errors"
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"fmt"
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"os"
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"os/exec"
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)
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// Pusher of images from local to remote registry.
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type Pusher struct {
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// Verbose logging.
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Verbose bool
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}
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// NewPusher creates an instance of a docker-based image pusher.
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func NewPusher() *Pusher {
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return &Pusher{}
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}
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// Push an image by name. Docker is expected to be already authenticated.
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func (n *Pusher) Push(image string) (err error) {
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// Check for the docker binary explicitly so that we can return
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// an extra-friendly error message.
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_, err = exec.LookPath("docker")
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if err != nil {
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err = errors.New("please install 'docker'")
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return
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}
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// set up the command, specifying a sanitized project name and connecting
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// standard output and error.
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cmd := exec.Command("docker", "push", image)
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// If verbose logging is enabled, echo appsody's chatty stdout.
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if n.Verbose {
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fmt.Println(cmd)
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cmd.Stdout = os.Stdout
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}
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// Capture stderr for echoing on failure.
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var stderr bytes.Buffer
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cmd.Stderr = &stderr
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// Run the command, echoing captured stderr as well ass the cmd internal error.
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err = cmd.Run()
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if err != nil {
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// TODO: sanitize stderr from appsody, or submit a PR to remove duplicates etc.
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err = errors.New(fmt.Sprintf("%v. %v", string(stderr.Bytes()), err.Error()))
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}
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return
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}
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