Vmware-guestinfo: add variable to set DNS search domain

Author: JrCs

Documentation/vmware-guestinfo.md

@@ -21,11 +21,12 @@ property names are prefixed with `guestinfo.` in the VMX, e.g., `guestinfo.hostn
 | `interface.<n>.route.<l>.gateway`     | `IP address`                    |
 | `interface.<n>.route.<l>.destination` | `CIDR IP address`               |
 | `dns.server.<x>`                      | `IP address`                    |
+| `dns.domain.<y>`                      | `DNS search domain`             |
 | `coreos.config.data`                  | `string`                        |
 | `coreos.config.data.encoding`         | `{"", "base64", "gzip+base64"}` |
 | `coreos.config.url`                   | `URL`                           |
 
-Note: "n", "m", "l", and "x" are 0-indexed, incrementing integers. The
+Note: "n", "m", "l", "x" and "y" are 0-indexed, incrementing integers. The
 identifier for an `interface` does not correspond to anything outside of this
 configuration; it serves only to distinguish between multiple `interface`s.
 

datasource/vmware/vmware.go

@@ -58,6 +58,12 @@ func (v vmware) FetchMetadata() (metadata datasource.Metadata, err error) {
 		}
 	}
 
+	for i := 0; ; i++ {
+		if domain := saveConfig("dns.domain.%d", i); domain == "" {
+			break
+		}
+	}
+
 	found := true
 	for i := 0; found; i++ {
 		found = false

network/vmware_test.go

@@ -98,6 +98,8 @@ func TestProcessVMwareNetconf(t *testing.T) {
 			config: map[string]string{
 				"dns.server.0":                    "1.2.3.4",
 				"dns.server.1":                    "5.6.7.8",
+				"dns.domain.0":                    "coreos.com",
+				"dns.domain.1":                    "example.com",
 				"interface.0.mac":                 "00:11:22:33:44:55",
 				"interface.0.ip.0.address":        "10.0.0.100/24",
 				"interface.0.ip.1.address":        "10.0.0.101/24",
@@ -124,6 +126,7 @@ func TestProcessVMwareNetconf(t *testing.T) {
 							gateway:     net.ParseIP("10.0.0.1")},
 						},
 						nameservers: []net.IP{net.ParseIP("1.2.3.4"), net.ParseIP("5.6.7.8")},
+						domains:     []string{"coreos.com", "example.com"},
 					},
 				}},
 				&physicalInterface{logicalInterface{
@@ -135,6 +138,7 @@ func TestProcessVMwareNetconf(t *testing.T) {
 							gateway:     net.ParseIP("10.0.1.1")},
 						},
 						nameservers: []net.IP{net.ParseIP("1.2.3.4"), net.ParseIP("5.6.7.8")},
+						domains:     []string{"coreos.com", "example.com"},
 					},
 				}},
 				&physicalInterface{logicalInterface{