Cleanup network option parsing

We were not handling the parsing of --ip.  This pr adds validation
checks and now will support the flag.

Move validation to the actual parsing of the network flags.

We should only parse the dns flags if the user changed them. We don't
want to pass default options if set in containers.conf to the server.
Potential for duplicating defaults.

Add support for --dns-opt flag passing

Begin handling of --network flag, although we don't have a way right now
to translate a string into a specgen.Namespace.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

3 files changed, 84 insertions, 34 deletions

diff --git a/cmd/podman/common/createparse.go b/cmd/podman/common/createparse.go
index aca6f752e..fe6e322c2 100644
--- a/cmd/podman/common/createparse.go
+++ b/cmd/podman/common/createparse.go
@@ -1,7 +1,6 @@
 package common
 
 import (
-	"github.com/containers/libpod/cmd/podman/parse"
 	"github.com/containers/libpod/pkg/util"
 	"github.com/pkg/errors"
 )
@@ -17,27 +16,7 @@ func (c *ContainerCLIOpts) validate() error {
 	if _, err := util.ValidatePullType(c.Pull); err != nil {
 		return err
 	}
-	// Verify the additional hosts are in correct format
-	for _, host := range c.Net.AddHosts {
-		if _, err := parse.ValidateExtraHost(host); err != nil {
-			return err
-		}
-	}
 
-	if dnsSearches := c.Net.DNSSearch; len(dnsSearches) > 0 {
-		// Validate domains are good
-		for _, dom := range dnsSearches {
-			if dom == "." {
-				if len(dnsSearches) > 1 {
-					return errors.Errorf("cannot pass additional search domains when also specifying '.'")
-				}
-				continue
-			}
-			if _, err := parse.ValidateDomain(dom); err != nil {
-				return err
-			}
-		}
-	}
 	var imageVolType = map[string]string{
 		"bind":   "",
 		"tmpfs":  "",
diff --git a/cmd/podman/common/netflags.go b/cmd/podman/common/netflags.go
index 41eed2988..104038d05 100644
--- a/cmd/podman/common/netflags.go
+++ b/cmd/podman/common/netflags.go
@@ -3,7 +3,9 @@ package common
 import (
 	"net"
 
+	"github.com/containers/libpod/cmd/podman/parse"
 	"github.com/containers/libpod/pkg/domain/entities"
+	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 )
@@ -58,20 +60,60 @@ func NetFlagsToNetOptions(cmd *cobra.Command) (*entities.NetOptions, error) {
 	if err != nil {
 		return nil, err
 	}
-	servers, err := cmd.Flags().GetStringSlice("dns")
-	if err != nil {
-		return nil, err
+	// Verify the additional hosts are in correct format
+	for _, host := range opts.AddHosts {
+		if _, err := parse.ValidateExtraHost(host); err != nil {
+			return nil, err
+		}
 	}
-	for _, d := range servers {
-		if d == "none" {
-			opts.DNSHost = true
-			break
+
+	if cmd.Flags().Changed("dns") {
+		servers, err := cmd.Flags().GetStringSlice("dns")
+		if err != nil {
+			return nil, err
+		}
+		for _, d := range servers {
+			if d == "none" {
+				opts.UseImageResolvConf = true
+				if len(servers) > 1 {
+					return nil, errors.Errorf("%s is not allowed to be specified with other DNS ip addresses", d)
+				}
+				break
+			}
+			dns := net.ParseIP(d)
+			if dns == nil {
+				return nil, errors.Errorf("%s is not an ip address", d)
+			}
+			opts.DNSServers = append(opts.DNSServers, dns)
 		}
-		opts.DNSServers = append(opts.DNSServers, net.ParseIP(d))
 	}
-	opts.DNSSearch, err = cmd.Flags().GetStringSlice("dns-search")
-	if err != nil {
-		return nil, err
+
+	if cmd.Flags().Changed("dns-opt") {
+		options, err := cmd.Flags().GetStringSlice("dns-opt")
+		if err != nil {
+			return nil, err
+		}
+		opts.DNSOptions = options
+	}
+
+	if cmd.Flags().Changed("dns-search") {
+		dnsSearches, err := cmd.Flags().GetStringSlice("dns-search")
+		if err != nil {
+			return nil, err
+		}
+		// Validate domains are good
+		for _, dom := range dnsSearches {
+			if dom == "." {
+				if len(dnsSearches) > 1 {
+					return nil, errors.Errorf("cannot pass additional search domains when also specifying '.'")
+				}
+				continue
+			}
+			if _, err := parse.ValidateDomain(dom); err != nil {
+				return nil, err
+			}
+		}
+		opts.DNSSearch = dnsSearches
 	}
 
 	m, err := cmd.Flags().GetString("mac-address")
@@ -85,6 +127,7 @@ func NetFlagsToNetOptions(cmd *cobra.Command) (*entities.NetOptions, error) {
 		}
 		opts.StaticMAC = &mac
 	}
+
 	inputPorts, err := cmd.Flags().GetStringSlice("publish")
 	if err != nil {
 		return nil, err
@@ -95,6 +138,31 @@ func NetFlagsToNetOptions(cmd *cobra.Command) (*entities.NetOptions, error) {
 			return nil, err
 		}
 	}
+
+	ip, err := cmd.Flags().GetString("ip")
+	if err != nil {
+		return nil, err
+	}
+	if ip != "" {
+		staticIP := net.ParseIP(ip)
+		if staticIP == nil {
+			return nil, errors.Errorf("%s is not an ip address", ip)
+		}
+		opts.StaticIP = &staticIP
+	}
+
 	opts.NoHosts, err = cmd.Flags().GetBool("no-hosts")
+
+	if cmd.Flags().Changed("network") {
+		network, err := cmd.Flags().GetString("network")
+		if err != nil {
+			return nil, err
+		}
+
+		return nil, errors.Errorf("network %s is not yet supported", network)
+		// TODO How do I convert a string network to a Specgen.Namespace?
+		//		opts.Network = specgen.Namespace{NSMode: network}
+	}
+
 	return &opts, err
 }
diff --git a/cmd/podman/common/specgen.go b/cmd/podman/common/specgen.go
index 85b344b3c..7972a805f 100644
--- a/cmd/podman/common/specgen.go
+++ b/cmd/podman/common/specgen.go
@@ -283,9 +283,12 @@ func FillOutSpecGen(s *specgen.SpecGenerator, c *ContainerCLIOpts, args []string
 	}
 	s.ShmSize = &shmSize
 	s.HostAdd = c.Net.AddHosts
-	s.DNSServer = c.Net.DNSServers
+	s.UseImageResolvConf = c.Net.UseImageResolvConf
+	s.DNSServers = c.Net.DNSServers
 	s.DNSSearch = c.Net.DNSSearch
-	s.DNSOption = c.Net.DNSOptions
+	s.DNSOptions = c.Net.DNSOptions
+	s.StaticIP = c.Net.StaticIP
+	s.StaticMAC = c.Net.StaticMAC
 
 	// deferred, must be added on libpod side
 	//var ImageVolumes map[string]struct{}