truncate commit in version

cmd/kind/version/version.go

@@ -35,7 +35,8 @@ func Version() string {
 		// if commit was set, add the + <build>
 		// we only do this for pre-release versions
 		if GitCommit != "" {
-			v += "+" + GitCommit
+			// NOTE: use 14 character short hash, like Kubernetes
+			v += "+" + truncate(GitCommit, 14)
 		}
 	}
 	return v
@@ -78,3 +79,10 @@ func NewCommand() *cobra.Command {
 	}
 	return cmd
 }
+
+func truncate(s string, maxLen int) string {
+	if len(s) < maxLen {
+		return s
+	}
+	return s[:maxLen]
+}

cmd/kind/version/version_test.go

@@ -0,0 +1,61 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package version
+
+import (
+	"testing"
+)
+
+func TestTruncate(t *testing.T) {
+	cases := []struct {
+		Value     string
+		MaxLength int
+		Expected  string
+	}{
+		{
+			Value:     "A Really Long String",
+			MaxLength: 1,
+			Expected:  "A",
+		},
+		{
+			Value:     "A Short String",
+			MaxLength: 10,
+			Expected:  "A Short St",
+		},
+		{
+			Value:     "Under Max Length String",
+			MaxLength: 1000,
+			Expected:  "Under Max Length String",
+		},
+	}
+	for _, tc := range cases {
+		tc := tc // capture range variable
+		t.Run(tc.Value, func(t *testing.T) {
+			t.Parallel()
+			result := truncate(tc.Value, tc.MaxLength)
+			// sanity check length
+			if len(result) > tc.MaxLength {
+				t.Errorf("Result %q longer than Max Length %d!", result, tc.MaxLength)
+			}
+			if tc.Expected != result {
+				t.Errorf("Strings did not match!")
+				t.Errorf("Expected: %q", tc.Expected)
+				t.Errorf("But got: %q", result)
+			}
+		})
+	}
+}

go.sum

@@ -17,6 +17,7 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90Pveol
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8 h1:1wopBVtVdWnn03fZelqdXTqk7U7zPQCb+T4rbU9ZEoU=
 golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a h1:1BGLXjeY4akVXGgbC9HugT3Jv3hCI0z56oJR5vAMgBU=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=