podman network create

initial implementation of network create.  we only support bridging
networks with this first pass.

Signed-off-by: baude <bbaude@redhat.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/pkg/network/files.go b/pkg/network/files.go
new file mode 100644
index 000000000..80fde5e17
--- /dev/null
+++ b/pkg/network/files.go
@@ -0,0 +1,107 @@
+package network
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"sort"
+	"strings"
+
+	"github.com/containernetworking/cni/libcni"
+	"github.com/containernetworking/plugins/plugins/ipam/host-local/backend/allocator"
+	"github.com/pkg/errors"
+)
+
+// LoadCNIConfsFromDir loads all the CNI configurations from a dir
+func LoadCNIConfsFromDir(dir string) ([]*libcni.NetworkConfigList, error) {
+	var configs []*libcni.NetworkConfigList
+	files, err := libcni.ConfFiles(dir, []string{".conflist"})
+	if err != nil {
+		return nil, err
+	}
+	sort.Strings(files)
+
+	for _, confFile := range files {
+		conf, err := libcni.ConfListFromFile(confFile)
+		if err != nil {
+			return nil, err
+		}
+		configs = append(configs, conf)
+	}
+	return configs, nil
+}
+
+// GetCNIConfigPathByName finds a CNI network by name and
+// returns its configuration file path
+func GetCNIConfigPathByName(name string) (string, error) {
+	files, err := libcni.ConfFiles(CNIConfigDir, []string{".conflist"})
+	if err != nil {
+		return "", err
+	}
+	for _, confFile := range files {
+		conf, err := libcni.ConfListFromFile(confFile)
+		if err != nil {
+			return "", err
+		}
+		if conf.Name == name {
+			return confFile, nil
+		}
+	}
+	return "", errors.Errorf("unable to find network configuration for %s", name)
+}
+
+// ReadRawCNIConfByName reads the raw CNI configuration for a CNI
+// network by name
+func ReadRawCNIConfByName(name string) ([]byte, error) {
+	confFile, err := GetCNIConfigPathByName(name)
+	if err != nil {
+		return nil, err
+	}
+	b, err := ioutil.ReadFile(confFile)
+	return b, err
+}
+
+// GetCNIPlugins returns a list of plugins that a given network
+// has in the form of a string
+func GetCNIPlugins(list *libcni.NetworkConfigList) string {
+	var plugins []string
+	for _, plug := range list.Plugins {
+		plugins = append(plugins, plug.Network.Type)
+	}
+	return strings.Join(plugins, ",")
+}
+
+// GetNetworksFromFilesystem gets all the networks from the cni configuration
+// files
+func GetNetworksFromFilesystem() ([]*allocator.Net, error) {
+	var cniNetworks []*allocator.Net
+	networks, err := LoadCNIConfsFromDir(CNIConfigDir)
+	if err != nil {
+		return nil, err
+	}
+	for _, n := range networks {
+		for _, cniplugin := range n.Plugins {
+			if cniplugin.Network.Type == "bridge" {
+				ipamConf := allocator.Net{}
+				if err := json.Unmarshal(cniplugin.Bytes, &ipamConf); err != nil {
+					return nil, err
+				}
+				cniNetworks = append(cniNetworks, &ipamConf)
+			}
+		}
+	}
+	return cniNetworks, nil
+}
+
+// GetNetworkNamesFromFileSystem gets all the names from the cni network
+// configuration files
+func GetNetworkNamesFromFileSystem() ([]string, error) {
+	var networkNames []string
+	networks, err := LoadCNIConfsFromDir(CNIConfigDir)
+	if err != nil {
+		return nil, err
+	}
+	for _, n := range networks {
+		networkNames = append(networkNames, n.Name)
+	}
+	return networkNames, nil
+}