63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
package dockerfile // import "github.com/docker/docker/builder/dockerfile"
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import (
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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()
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Probe(parentID string, runConfig *container.Config) (string, error)
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}
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type imageProber struct {
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cache builder.ImageCache
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reset func() builder.ImageCache
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cacheBusted bool
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}
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func newImageProber(cacheBuilder builder.ImageCacheBuilder, cacheFrom []string, noCache bool) ImageProber {
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if noCache {
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return &nopProber{}
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}
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reset := func() builder.ImageCache {
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return cacheBuilder.MakeImageCache(cacheFrom)
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}
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return &imageProber{cache: reset(), reset: reset}
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}
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func (c *imageProber) Reset() {
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c.cache = c.reset()
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c.cacheBusted = false
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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() {}
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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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