// PullAndExtract returns a ProcfileExtractor that will pull the image using the
// docker client, then attempt to extract the Procfile from the WORKDIR, or
// fallback to the CMD directive in the Procfile.
func PullAndExtract(c *dockerutil.Client) ProcfileExtractor {
e := procfile.MultiExtractor(
procfile.NewFileExtractor(c.Client),
procfile.NewCMDExtractor(c.Client),
)
return ProcfileExtractor(func(ctx context.Context, img image.Image, w io.Writer) (procfile.Procfile, error) {
repo := img.Repository
if img.Registry != "" {
repo = fmt.Sprintf("%s/%s", img.Registry, img.Repository)
}
if err := c.PullImage(ctx, docker.PullImageOptions{
Registry: img.Registry,
Repository: repo,
Tag: img.Tag,
OutputStream: w,
RawJSONStream: true,
}); err != nil {
return nil, err
}
return e.Extract(img)
})
}
// PullAndExtract returns a ProcfileExtractor that will pull the image using the
// docker client, then attempt to extract the the Procfile, or fallback to the
// CMD directive in the Dockerfile.
func PullAndExtract(c *dockerutil.Client) ProcfileExtractor {
e := multiExtractor(
newFileExtractor(c),
newCMDExtractor(c),
)
return ProcfileExtractorFunc(func(ctx context.Context, img image.Image, w io.Writer) ([]byte, error) {
if err := c.PullImage(ctx, docker.PullImageOptions{
Registry: img.Registry,
Repository: img.Repository,
Tag: img.Tag,
OutputStream: w,
RawJSONStream: true,
}); err != nil {
return nil, err
}
return e.Extract(ctx, img, w)
})
}