resources/images: Make the image cache more robust

Also allow timeout to be set as a duration string, e.g. `30s`.

Fixes #6501

1 files changed, 11 insertions, 9 deletions

diff --git a/resources/images/image.go b/resources/images/image.go
index bac05ab70..62e9bb558 100644
--- a/resources/images/image.go
+++ b/resources/images/image.go
@@ -123,6 +123,15 @@ func (i Image) WithSpec(s Spec) *Image {
 	return &i
 }
 
+// InitConfig reads the image config from the given reader.
+func (i *Image) InitConfig(r io.Reader) error {
+	var err error
+	i.configInit.Do(func() {
+		i.config, _, err = image.DecodeConfig(r)
+	})
+	return err
+}
+
 func (i *Image) initConfig() error {
 	var err error
 	i.configInit.Do(func() {
@@ -130,10 +139,7 @@ func (i *Image) initConfig() error {
 			return
 		}
 
-		var (
-			f      hugio.ReadSeekCloser
-			config image.Config
-		)
+		var f hugio.ReadSeekCloser
 
 		f, err = i.Spec.ReadSeekCloser()
 		if err != nil {
@@ -141,11 +147,7 @@ func (i *Image) initConfig() error {
 		}
 		defer f.Close()
 
-		config, _, err = image.DecodeConfig(f)
-		if err != nil {
-			return
-		}
-		i.config = config
+		i.config, _, err = image.DecodeConfig(f)
 	})
 
 	if err != nil {