feat(http): optional query parameter to update only containers of a specified image (#1289)

* feat(http): optional query parameter to update only containers of a specified image

* fix style issues

* comma separated image parameter

* Support comma-separated query parameter as well as specifying it multiple times

Co-authored-by: nils måsén <nils@piksel.se>

* fixed compile error

* fixed FilterByImageTag

Not sure what changed in my testing setup, but Docker reports image names including the tag name now.

* consistent use of image/tag (use image)

* fixed multiple image queries

* assuming I'm right here, only block on lock when any images are specified.

* add unit tests for image filter. didn't add tests for update api because they didn't already exist

* whoops.

* use ImageName instead, add unit test for empty ImageName filter.

Co-authored-by: nils måsén <nils@piksel.se>

pkg/filters/filters.go

@@ -70,6 +70,24 @@ func FilterByScope(scope string, baseFilter t.Filter) t.Filter {
 	}
 }
 
+// FilterByImage returns all containers that have a specific image
+func FilterByImage(images []string, baseFilter t.Filter) t.Filter {
+	if images == nil {
+		return baseFilter
+	}
+
+	return func(c t.FilterableContainer) bool {
+		image := strings.Split(c.ImageName(), ":")[0]
+		for _, targetImage := range images {
+			if image == targetImage {
+				return baseFilter(c)
+			}
+		}
+
+		return false
+	}
+}
+
 // BuildFilter creates the needed filter of containers
 func BuildFilter(names []string, enableLabel bool, scope string) (t.Filter, string) {
 	sb := strings.Builder{}