Support wildcards in Dockerfiles

pkg/skaffold/docker/parse.go

@@ -95,8 +95,35 @@ func readDockerfile(workspace, dockerfilePath string) ([]string, error) {
 
 	dispatchInstructions(res)
 
+	expandedPaths := make(map[string]bool)
+	for p := range depMap {
+		path := filepath.Join(workspace, p)
+
+		if _, err := os.Stat(path); err == nil {
+			expandedPaths[p] = true
+			continue
+		}
+
+		files, err := filepath.Glob(path)
+		if err != nil {
+			return nil, errors.Wrap(err, "invalid glob pattern")
+		}
+		if files == nil {
+			return nil, fmt.Errorf("file pattern must match at least one file %s", path)
+		}
+
+		for _, f := range files {
+			rel, err := filepath.Rel(workspace, f)
+			if err != nil {
+				return nil, fmt.Errorf("getting relative path of %s", f)
+			}
+
+			expandedPaths[rel] = true
+		}
+	}
+
 	var deps []string
-	for dep := range depMap {
+	for dep := range expandedPaths {
 		deps = append(deps, dep)
 	}
 	logrus.Infof("Found dependencies for dockerfile %s", deps)

pkg/skaffold/docker/parse_test.go

@@ -46,6 +46,16 @@ COPY test.conf /etc/test2
 CMD nginx
 `
 
+const wildcards = `
+FROM nginx
+ADD *.go /tmp
+`
+
+const wildcardsMatchesNone = `
+FROM nginx
+ADD *.none /tmp
+`
+
 const multiStageDockerfile = `
 FROM golang:1.9.2
 WORKDIR /go/src/github.com/r2d4/leeroy/
@@ -106,9 +116,11 @@ var ImageConfigs = map[string]*v1.ConfigFile{
 			},
 		},
 	},
-	"ubuntu:14.04": {Config: v1.Config{}},
-	"nginx":        {Config: v1.Config{}},
-	"busybox":      {Config: v1.Config{}},
+	"golang:1.9.2":           {Config: v1.Config{}},
+	"gcr.io/distroless/base": {Config: v1.Config{}},
+	"ubuntu:14.04":           {Config: v1.Config{}},
+	"nginx":                  {Config: v1.Config{}},
+	"busybox":                {Config: v1.Config{}},
 	"oneport": {
 		Config: v1.Config{
 			ExposedPorts: map[string]struct{}{
@@ -154,6 +166,18 @@ func TestGetDependencies(t *testing.T) {
 			workspace:   "docker",
 			expected:    []string{"Dockerfile", "nginx.conf"},
 		},
+		{
+			description: "wildcards",
+			dockerfile:  wildcards,
+			workspace:   ".",
+			expected:    []string{"Dockerfile", "server.go", "worker.go"},
+		},
+		{
+			description: "wildcards matches none",
+			dockerfile:  wildcardsMatchesNone,
+			workspace:   ".",
+			shouldErr:   true,
+		},
 		{
 			description: "bad read",
 			badReader:   true,
@@ -212,10 +236,10 @@ func TestGetDependencies(t *testing.T) {
 		},
 		{
 			description: "dockerignore with context in parent directory",
-			dockerfile:  contextDockerfile,
+			dockerfile:  copyDirectory,
 			workspace:   "docker/..",
-			ignore:      "bar\ndocker/*",
-			expected:    []string{"Dockerfile", "file", "server.go", "test.conf", "worker.go"},
+			ignore:      "bar\ndocker/*\n*.go",
+			expected:    []string{"Dockerfile", "file", "test.conf"},
 		},
 		{
 			description: "onbuild test",