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