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add http head based digest comparison to avoid dockerhub rate limits

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Simon Aronsson 2020-12-06 13:21:04 +01:00 • committed by GitHub
parent c8bd484b9e
commit cb62b16369
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23 changed files with 1476 additions and 57 deletions
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25
pkg/container/client.go
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@ -8,6 +8,7 @@ import (
"time"
"github.com/containrrr/watchtower/pkg/registry"
"github.com/containrrr/watchtower/pkg/registry/digest"
t "github.com/containrrr/watchtower/pkg/types"
"github.com/docker/docker/api/types"
@ -275,14 +276,36 @@ func (client dockerClient) HasNewImage(ctx context.Context, container Container)
func (client dockerClient) PullImage(ctx context.Context, container Container) error {
containerName := container.Name()
imageName := container.ImageName()
log.Debugf("Pulling %s for %s", imageName, containerName)
fields := log.Fields{
"image": imageName,
"container": containerName,
}
log.WithFields(fields).Debugf("Trying to load authentication credentials.")
opts, err := registry.GetPullOptions(imageName)
if opts.RegistryAuth != "" {
log.Debug("Credentials loaded")
}
if err != nil {
log.Debugf("Error loading authentication credentials %s", err)
return err
}
log.WithFields(fields).Debugf("Checking if pull is needed")
if match, err := digest.CompareDigest(container, opts.RegistryAuth); err != nil {
log.Info("Could not do a head request, falling back to regulara pull.")
log.Debugf("Reason: %s", err.Error())
} else if match {
log.Debug("No pull needed. Skipping image.")
return nil
} else {
log.Debug("Digests did not match, doing a pull.")
}
log.WithFields(fields).Debugf("Pulling image")
response, err := client.api.ImagePull(ctx, imageName, opts)
if err != nil {
log.Debugf("Error pulling image %s, %s", imageName, err)