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, 11 insertions, 0 deletions

diff --git a/cmd/podman/networks/list.go b/cmd/podman/networks/list.go
index 6e6bbb07d..16ae980dc 100644
--- a/cmd/podman/networks/list.go
+++ b/cmd/podman/networks/list.go
@@ -37,6 +37,7 @@ var (
 var (
 	networkListOptions entities.NetworkListOptions
 	filters            []string
+	noTrunc            bool
 )
 
 func networkListFlags(flags *pflag.FlagSet) {
@@ -45,6 +46,7 @@ func networkListFlags(flags *pflag.FlagSet) {
 	_ = networklistCommand.RegisterFlagCompletionFunc(formatFlagName, common.AutocompleteJSONFormat)
 
 	flags.BoolVarP(&networkListOptions.Quiet, "quiet", "q", false, "display only names")
+	flags.BoolVar(&noTrunc, "no-trunc", false, "Do not truncate the network ID")
 
 	filterFlagName := "filter"
 	flags.StringArrayVarP(&filters, filterFlagName, "f", nil, "Provide filter values (e.g. 'name=podman')")
@@ -96,6 +98,7 @@ func networkList(cmd *cobra.Command, args []string) error {
 		"Version":    "version",
 		"Plugins":    "plugins",
 		"Labels":     "labels",
+		"ID":         "network id",
 	})
 	renderHeaders := true
 	row := "{{.Name}}\t{{.Version}}\t{{.Plugins}}\n"
@@ -155,3 +158,11 @@ func (n ListPrintReports) Labels() string {
 	}
 	return strings.Join(list, ",")
 }
+
+func (n ListPrintReports) ID() string {
+	length := 12
+	if noTrunc {
+		length = 64
+	}
+	return network.GetNetworkID(n.Name)[:length]
+}