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do not crash when displaying dangling images

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the previous method required a populated image template to create
the headers and always selected the first image in the slice. when
dealing with dangling images, they are not populated and therefore
would panic.

Resolves: #2246

Signed-off-by: baude <bbaude@redhat.com>
This commit is contained in:
baude
2019-02-08 17:09:00 -06:00
parent afd4d5f4a4
commit e071ac20f8
1 changed files with 8 additions and 5 deletions
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13
cmd/podman/images.go
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@ -305,6 +305,7 @@ func getImagesJSONOutput(ctx context.Context, images []*adapter.ContainerImage)
// generateImagesOutput generates the images based on the format provided
func generateImagesOutput(ctx context.Context, images []*adapter.ContainerImage, opts imagesOptions) error {
templateMap := GenImageOutputMap()
if len(images) == 0 {
return nil
}
@ -316,15 +317,17 @@ func generateImagesOutput(ctx context.Context, images []*adapter.ContainerImage,
out = formats.JSONStructArray{Output: imagesToGeneric([]imagesTemplateParams{}, imagesOutput)}
default:
imagesOutput := getImagesTemplateOutput(ctx, images, opts)
out = formats.StdoutTemplateArray{Output: imagesToGeneric(imagesOutput, []imagesJSONParams{}), Template: opts.outputformat, Fields: imagesOutput[0].HeaderMap()}
out = formats.StdoutTemplateArray{Output: imagesToGeneric(imagesOutput, []imagesJSONParams{}), Template: opts.outputformat, Fields: templateMap}
}
return formats.Writer(out).Out()
}
// HeaderMap produces a generic map of "headers" based on a line
// of output
func (i *imagesTemplateParams) HeaderMap() map[string]string {
v := reflect.Indirect(reflect.ValueOf(i))
// GenImageOutputMap generates the map used for outputting the images header
// without requiring a populated image. This replaces the previous HeaderMap
// call.
func GenImageOutputMap() map[string]string {
io := imagesTemplateParams{}
v := reflect.Indirect(reflect.ValueOf(io))
values := make(map[string]string)
for i := 0; i < v.NumField(); i++ {