pkg/supplemented: add a package for grouping images together

Add pkg/supplemented, which can stitch together multiple image references, typically one which contains a manifest list or image index, and one or more single-image references to which the list or index refers, into one big grab bag full of instances and blobs. Signed-off-by: Nalin Dahyabhai <[email protected]> Closes: containers#1902 Approved by: rhatdan
caiges · Nov 12, 2019 · 37250bb · 37250bb
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diff --git a/pkg/supplemented/errors.go b/pkg/supplemented/errors.go
@@ -0,0 +1,17 @@
+package supplemented
+
+import (
+	"errors"
+
+	"github.com/containers/buildah/pkg/manifests"
+)
+
+var (
+	// ErrDigestNotFound is returned when we look for an image instance
+	// with a particular digest in a list or index, and fail to find it.
+	ErrDigestNotFound = manifests.ErrDigestNotFound
+	// ErrBlobNotFound is returned when try to figure out which supplemental
+	// image we should ask for a blob with the specified characteristics,
+	// based on the information in each of the supplemental images' manifests.
+	ErrBlobNotFound = errors.New("location of blob could not be determined")
+)