Added flag dependent vendor behavior for ensure update as well

CHANGELOG.md

@@ -4,6 +4,7 @@ BUG FIXES:
 
 * Releases targeting Windows now have a `.exe` suffix (#1291).
 * Adaptively recover from dirty and corrupted git repositories in cache (#1279).
+* Fix `-no-vendor` flag for `ensure -update` ([#1361](https://github.com/golang/dep/pull/1361))
 
 IMPROVEMENTS:
 

cmd/dep/ensure.go

@@ -226,6 +226,13 @@ func (cmd *ensureCommand) validateFlags() error {
 	return nil
 }
 
+func (cmd *ensureCommand) vendorBehavior() dep.VendorBehavior {
+	if cmd.noVendor {
+		return dep.VendorNever
+	}
+	return dep.VendorOnChanged
+}
+
 func (cmd *ensureCommand) runDefault(ctx *dep.Ctx, args []string, p *dep.Project, sm gps.SourceManager, params gps.SolveParameters) error {
 	// Bare ensure doesn't take any args.
 	if len(args) != 0 {
@@ -283,11 +290,7 @@ func (cmd *ensureCommand) runDefault(ctx *dep.Ctx, args []string, p *dep.Project
 		return handleAllTheFailuresOfTheWorld(err)
 	}
 
-	vendorBehavior := dep.VendorOnChanged
-	if cmd.noVendor {
-		vendorBehavior = dep.VendorNever
-	}
-	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), vendorBehavior)
+	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), cmd.vendorBehavior())
 	if err != nil {
 		return err
 	}
@@ -377,7 +380,7 @@ func (cmd *ensureCommand) runUpdate(ctx *dep.Ctx, args []string, p *dep.Project,
 		return handleAllTheFailuresOfTheWorld(err)
 	}
 
-	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), dep.VendorOnChanged)
+	sw, err := dep.NewSafeWriter(nil, p.Lock, dep.LockFromSolution(solution), cmd.vendorBehavior())
 	if err != nil {
 		return err
 	}

cmd/dep/testdata/harness_tests/ensure/update/novendor/final/Gopkg.toml

@@ -0,0 +1,4 @@
+
+[[constraint]]
+  name = "github.com/sdboyer/deptest"
+  version = "1.0.0"

cmd/dep/testdata/harness_tests/ensure/update/novendor/initial/Gopkg.toml

@@ -0,0 +1,4 @@
+
+[[constraint]]
+  name = "github.com/sdboyer/deptest"
+  version = "1.0.0"

cmd/dep/testdata/harness_tests/ensure/update/novendor/initial/main.go

@@ -0,0 +1,12 @@
+// 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/sdboyer/deptest"
+)
+
+func main() {
+}

cmd/dep/testdata/harness_tests/ensure/update/novendor/testcase.json

@@ -0,0 +1,5 @@
+{
+  "commands": [
+    ["ensure", "-update", "-no-vendor"]
+  ]
+}