Merge pull request GoogleContainerTools#149 from vrothberg/rpm-support

add rpm support

Author: nkubala

differs/BUILD.bazel

@@ -10,12 +10,16 @@ go_library(
         "node_diff.go",
         "package_differs.go",
         "pip_diff.go",
+        "rpm_diff.go",
     ],
     importpath = "github.com/GoogleCloudPlatform/container-diff/differs",
     visibility = ["//visibility:public"],
     deps = [
         "//pkg/util:go_default_library",
         "//util:go_default_library",
+        "//vendor/github.com/containers/image/docker/tarfile:go_default_library",
+        "//vendor/github.com/fsouza/go-dockerclient:go_default_library",
+        "//vendor/github.com/nightlyone/lockfile:go_default_library",
         "//vendor/github.com/sirupsen/logrus:go_default_library",
     ],
 )
@@ -27,6 +31,7 @@ go_test(
         "differs_test.go",
         "node_diff_test.go",
         "pip_diff_test.go",
+        "rpm_diff_test.go",
     ],
     importpath = "github.com/GoogleCloudPlatform/container-diff/differs",
     library = ":go_default_library",

differs/differs.go

@@ -45,6 +45,7 @@ var Analyzers = map[string]Analyzer{
 	"history": HistoryAnalyzer{},
 	"file":    FileAnalyzer{},
 	"apt":     AptAnalyzer{},
+	"rpm":     RPMAnalyzer{},
 	"pip":     PipAnalyzer{},
 	"node":    NodeAnalyzer{},
 }