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package dockerfile // import "github.com/docker/docker/builder/dockerfile"
import (
"context"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/builder"
"github.com/sirupsen/logrus"
)
// ImageProber exposes an Image cache to the Builder. It supports resetting a
// cache.
type ImageProber interface {
Reset(ctx context.Context) error
Probe(parentID string, runConfig *container.Config) (string, error)
}
type resetFunc func(context.Context) (builder.ImageCache, error)
type imageProber struct {
cache builder.ImageCache
reset resetFunc
cacheBusted bool
}
func newImageProber(ctx context.Context, cacheBuilder builder.ImageCacheBuilder, cacheFrom []string, noCache bool) (ImageProber, error) {
if noCache {
return &nopProber{}, nil
}
reset := func(ctx context.Context) (builder.ImageCache, error) {
return cacheBuilder.MakeImageCache(ctx, cacheFrom)
}
cache, err := reset(ctx)
if err != nil {
return nil, err
}
return &imageProber{cache: cache, reset: reset}, nil
}
func (c *imageProber) Reset(ctx context.Context) error {
newCache, err := c.reset(ctx)
if err != nil {
return err
}
c.cache = newCache
c.cacheBusted = false
return nil
}
// Probe checks if cache match can be found for current build instruction.
// It returns the cachedID if there is a hit, and the empty string on miss
func (c *imageProber) Probe(parentID string, runConfig *container.Config) (string, error) {
if c.cacheBusted {
return "", nil
}
cacheID, err := c.cache.GetCache(parentID, runConfig)
if err != nil {
return "", err
}
if len(cacheID) == 0 {
logrus.Debugf("[BUILDER] Cache miss: %s", runConfig.Cmd)
c.cacheBusted = true
return "", nil
}
logrus.Debugf("[BUILDER] Use cached version: %s", runConfig.Cmd)
return cacheID, nil
}
type nopProber struct{}
func (c *nopProber) Reset(ctx context.Context) error {
return nil
}
func (c *nopProber) Probe(_ string, _ *container.Config) (string, error) {
return "", nil
}
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