add resolvconf

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)

networkfs/resolvconf/resolvconf_test.go

@@ -0,0 +1,133 @@
+package resolvconf
+
+import (
+	"bytes"
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func TestGet(t *testing.T) {
+	resolvConfUtils, err := Get()
+	if err != nil {
+		t.Fatal(err)
+	}
+	resolvConfSystem, err := ioutil.ReadFile("/etc/resolv.conf")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(resolvConfUtils) != string(resolvConfSystem) {
+		t.Fatalf("/etc/resolv.conf and GetResolvConf have different content.")
+	}
+}
+
+func TestGetNameservers(t *testing.T) {
+	for resolv, result := range map[string][]string{`
+nameserver 1.2.3.4
+nameserver 40.3.200.10
+search example.com`: {"1.2.3.4", "40.3.200.10"},
+		`search example.com`: {},
+		`nameserver 1.2.3.4
+search example.com
+nameserver 4.30.20.100`: {"1.2.3.4", "4.30.20.100"},
+		``: {},
+		`  nameserver 1.2.3.4   `: {"1.2.3.4"},
+		`search example.com
+nameserver 1.2.3.4
+#nameserver 4.3.2.1`: {"1.2.3.4"},
+		`search example.com
+nameserver 1.2.3.4 # not 4.3.2.1`: {"1.2.3.4"},
+	} {
+		test := GetNameservers([]byte(resolv))
+		if !strSlicesEqual(test, result) {
+			t.Fatalf("Wrong nameserver string {%s} should be %v. Input: %s", test, result, resolv)
+		}
+	}
+}
+
+func TestGetNameserversAsCIDR(t *testing.T) {
+	for resolv, result := range map[string][]string{`
+nameserver 1.2.3.4
+nameserver 40.3.200.10
+search example.com`: {"1.2.3.4/32", "40.3.200.10/32"},
+		`search example.com`: {},
+		`nameserver 1.2.3.4
+search example.com
+nameserver 4.30.20.100`: {"1.2.3.4/32", "4.30.20.100/32"},
+		``: {},
+		`  nameserver 1.2.3.4   `: {"1.2.3.4/32"},
+		`search example.com
+nameserver 1.2.3.4
+#nameserver 4.3.2.1`: {"1.2.3.4/32"},
+		`search example.com
+nameserver 1.2.3.4 # not 4.3.2.1`: {"1.2.3.4/32"},
+	} {
+		test := GetNameserversAsCIDR([]byte(resolv))
+		if !strSlicesEqual(test, result) {
+			t.Fatalf("Wrong nameserver string {%s} should be %v. Input: %s", test, result, resolv)
+		}
+	}
+}
+
+func TestGetSearchDomains(t *testing.T) {
+	for resolv, result := range map[string][]string{
+		`search example.com`:           {"example.com"},
+		`search example.com # ignored`: {"example.com"},
+		` 	  search 	 example.com 	  `: {"example.com"},
+		` 	  search 	 example.com 	  # ignored`: {"example.com"},
+		`search foo.example.com example.com`: {"foo.example.com", "example.com"},
+		`	   search   	   foo.example.com 	 example.com 	`: {"foo.example.com", "example.com"},
+		`	   search   	   foo.example.com 	 example.com 	# ignored`: {"foo.example.com", "example.com"},
+		``:          {},
+		`# ignored`: {},
+		`nameserver 1.2.3.4
+search foo.example.com example.com`: {"foo.example.com", "example.com"},
+		`nameserver 1.2.3.4
+search dup1.example.com dup2.example.com
+search foo.example.com example.com`: {"foo.example.com", "example.com"},
+		`nameserver 1.2.3.4
+search foo.example.com example.com
+nameserver 4.30.20.100`: {"foo.example.com", "example.com"},
+	} {
+		test := GetSearchDomains([]byte(resolv))
+		if !strSlicesEqual(test, result) {
+			t.Fatalf("Wrong search domain string {%s} should be %v. Input: %s", test, result, resolv)
+		}
+	}
+}
+
+func strSlicesEqual(a, b []string) bool {
+	if len(a) != len(b) {
+		return false
+	}
+
+	for i, v := range a {
+		if v != b[i] {
+			return false
+		}
+	}
+
+	return true
+}
+
+func TestBuild(t *testing.T) {
+	file, err := ioutil.TempFile("", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove(file.Name())
+
+	err = Build(file.Name(), []string{"ns1", "ns2", "ns3"}, []string{"search1"})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	content, err := ioutil.ReadFile(file.Name())
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if expected := "nameserver ns1\nnameserver ns2\nnameserver ns3\nsearch search1\n"; !bytes.Contains(content, []byte(expected)) {
+		t.Fatalf("Expected to find '%s' got '%s'", expected, content)
+	}
+}