status: project status error out when project is not in lock

cmd/dep/status.go

@@ -897,6 +897,12 @@ func runProjectStatus(ctx *dep.Ctx, args []string, p *dep.Project, sm gps.Source
 		if err != nil {
 			return err
 		}
+
+		// Check if the target project is in the lock.
+		if !p.Lock.HasProjectWithRoot(pr) {
+			return errors.Errorf("%s is not in the lock file. Ensure that the project is being used and run `dep ensure` to generate a new lock file.", pr)
+		}
+
 		prs = append(prs, pr)
 	}
 

cmd/dep/testdata/harness_tests/status/project_status_not_in_lock/final/Gopkg.toml

@@ -0,0 +1,11 @@
+[[constraint]]
+  branch = "master"
+  name = "github.com/darkowlzz/deptest-project-status"
+
+[[constraint]]
+  name = "github.com/sdboyer/deptest"
+  version = "1.0.0"
+
+[[constraint]]
+  name = "github.com/sdboyer/deptestdos"
+  version = "2.0.0"

cmd/dep/testdata/harness_tests/status/project_status_not_in_lock/final/main.go

@@ -0,0 +1,13 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	_ "github.com/darkowlzz/deptest-project-status/pkgfoo"
+	_ "github.com/sdboyer/deptest"
+	_ "github.com/sdboyer/deptestdos"
+)
+
+func main() {}

cmd/dep/testdata/harness_tests/status/project_status_not_in_lock/initial/Gopkg.toml

@@ -0,0 +1,11 @@
+[[constraint]]
+  branch = "master"
+  name = "github.com/darkowlzz/deptest-project-status"
+
+[[constraint]]
+  name = "github.com/sdboyer/deptest"
+  version = "1.0.0"
+
+[[constraint]]
+  name = "github.com/sdboyer/deptestdos"
+  version = "2.0.0"

cmd/dep/testdata/harness_tests/status/project_status_not_in_lock/initial/main.go

@@ -0,0 +1,13 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	_ "github.com/darkowlzz/deptest-project-status/pkgfoo"
+	_ "github.com/sdboyer/deptest"
+	_ "github.com/sdboyer/deptestdos"
+)
+
+func main() {}

cmd/dep/testdata/harness_tests/status/project_status_not_in_lock/testcase.json

@@ -0,0 +1,12 @@
+{
+  "commands": [
+    ["ensure"],
+    ["status", "github.com/golang/dep"]
+  ],
+  "error-expected": "github.com/golang/dep is not in the lock file. Ensure that the project is being used and run `dep ensure` to generate a new lock file.",
+  "vendor-final": [
+    "github.com/darkowlzz/deptest-project-status",
+    "github.com/sdboyer/deptest",
+    "github.com/sdboyer/deptestdos"
+  ]
+}