Add support for network ids

The network ID is not stored. It is just the sha256 hash from
the network name. There is a risk of a potential hash collision.
However it's very unlikely and even if we hit this it will
complain that more than network with this ID exists.

The main benefit is that the compat api can have proper
network ID support. Also this adds the support for
`podman network ls --format "{{.ID}}"` and `--filter id=<ID>`.

It also ensures that we can do network rm <ID> and network
inspect <ID>.

Since we use a hash this commit is backwards compatible even for
already existing networks.

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

1 files changed, 10 insertions, 1 deletions

diff --git a/libpod/network/network.go b/libpod/network/network.go
index 0febb52f6..89f0b67ac 100644
--- a/libpod/network/network.go
+++ b/libpod/network/network.go
@@ -1,6 +1,8 @@
 package network
 
 import (
+	"crypto/sha256"
+	"encoding/hex"
 	"encoding/json"
 	"net"
 	"os"
@@ -175,7 +177,7 @@ func RemoveNetwork(config *config.Config, name string) error {
 		return err
 	}
 	defer l.releaseCNILock()
-	cniPath, err := GetCNIConfigPathByName(config, name)
+	cniPath, err := GetCNIConfigPathByNameOrID(config, name)
 	if err != nil {
 		return err
 	}
@@ -229,3 +231,10 @@ func Exists(config *config.Config, name string) (bool, error) {
 	}
 	return true, nil
 }
+
+// GetNetworkID return the network ID for a given name.
+// It is just the sha256 hash but this should be good enough.
+func GetNetworkID(name string) string {
+	hash := sha256.Sum256([]byte(name))
+	return hex.EncodeToString(hash[:])
+}