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Improve warnings when image digest pinning fails 

Signed-off-by: Nishant Totla <nishanttotla@gmail.com>
This commit is contained in:
Nishant Totla 2017-03-09 14:36:45 -08:00
parent 18163a42ec
commit 44855dff42
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GPG Key ID: 7EA5781C9B3D0C19
1 changed files with 12 additions and 3 deletions
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15
daemon/cluster/services.go
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@ -111,7 +111,8 @@ func (c *Cluster) CreateService(s types.ServiceSpec, encodedAuth string) (*apity
digestImage, err := c.imageWithDigestString(ctx, ctnr.Image, authConfig)
if err != nil {
logrus.Warnf("unable to pin image %s to digest: %s", ctnr.Image, err.Error())
resp.Warnings = append(resp.Warnings, fmt.Sprintf("unable to pin image %s to digest: %s", ctnr.Image, err.Error()))
// warning in the client response should be concise
resp.Warnings = append(resp.Warnings, digestWarning(ctnr.Image))
} else if ctnr.Image != digestImage {
logrus.Debugf("pinning image %s by digest: %s", ctnr.Image, digestImage)
ctnr.Image = digestImage
@ -200,7 +201,8 @@ func (c *Cluster) UpdateService(serviceIDOrName string, version uint64, spec typ
digestImage, err := c.imageWithDigestString(ctx, newCtnr.Image, authConfig)
if err != nil {
logrus.Warnf("unable to pin image %s to digest: %s", newCtnr.Image, err.Error())
resp.Warnings = append(resp.Warnings, fmt.Sprintf("unable to pin image %s to digest: %s", newCtnr.Image, err.Error()))
// warning in the client response should be concise
resp.Warnings = append(resp.Warnings, digestWarning(newCtnr.Image))
} else if newCtnr.Image != digestImage {
logrus.Debugf("pinning image %s by digest: %s", newCtnr.Image, digestImage)
newCtnr.Image = digestImage
@ -351,7 +353,7 @@ func (c *Cluster) imageWithDigestString(ctx context.Context, image string, authC
namedRef, ok := ref.(reference.Named)
if !ok {
if _, ok := ref.(reference.Digested); ok {
return "", errors.New("image reference is an image ID")
return image, nil
}
return "", errors.Errorf("unknown image reference format: %s", image)
}
@ -383,3 +385,10 @@ func (c *Cluster) imageWithDigestString(ctx context.Context, image string, authC
// reference already contains a digest, so just return it
return reference.FamiliarString(ref), nil
}
// digestWarning constructs a formatted warning string
// using the image name that could not be pinned by digest. The
// formatting is hardcoded, but could me made smarter in the future
func digestWarning(image string) string {
return fmt.Sprintf("image %s could not be accessed on a registry to record\nits digest. Each node will access %s independently,\npossibly leading to different nodes running different\nversions of the image.\n", image, image)
}