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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package main
import (
"errors"
"fmt"
"github.com/jessevdk/go-flags"
"github.com/snapcore/snapd/client"
"github.com/snapcore/snapd/i18n"
)
type cmdInterfaces struct {
clientMixin
Interface string `short:"i"`
Positionals struct {
Query interfacesSlotOrPlugSpec `skip-help:"true"`
} `positional-args:"true"`
}
var shortInterfacesHelp = i18n.G("List interfaces' slots and plugs")
var longInterfacesHelp = i18n.G(`
The interfaces command lists interfaces available in the system.
By default all slots and plugs, used and offered by all snaps, are displayed.
$ snap interfaces <snap>:<slot or plug>
Lists only the specified slot or plug.
$ snap interfaces <snap>
Lists the slots offered and plugs used by the specified snap.
$ snap interfaces -i=<interface> [<snap>]
Filters the complete output so only plugs and/or slots matching the provided
details are listed.
NOTE this command is deprecated and has been replaced with the 'connections'
command.
`)
func init() {
cmd := addCommand("interfaces", shortInterfacesHelp, longInterfacesHelp, func() flags.Commander {
return &cmdInterfaces{}
}, map[string]string{
// TRANSLATORS: This should not start with a lowercase letter.
"i": i18n.G("Constrain listing to specific interfaces"),
}, []argDesc{{
// TRANSLATORS: This needs to begin with < and end with >
name: i18n.G("<snap>:<slot or plug>"),
// TRANSLATORS: This should not start with a lowercase letter.
desc: i18n.G("Constrain listing to a specific snap or snap:name"),
}})
cmd.hidden = true
}
var interfacesDeprecationNotice = i18n.G("'snap interfaces' is deprecated; use 'snap connections'.")
func (x *cmdInterfaces) Execute(args []string) error {
if len(args) > 0 {
return ErrExtraArgs
}
opts := client.ConnectionOptions{
All: true,
Snap: x.Positionals.Query.Snap,
}
ifaces, err := x.client.Connections(&opts)
if err != nil {
return err
}
if len(ifaces.Plugs) == 0 && len(ifaces.Slots) == 0 {
return errors.New(i18n.G("no interfaces found"))
}
defer fmt.Fprintln(Stderr, "\n"+fill(interfacesDeprecationNotice, 0))
w := tabWriter()
defer w.Flush()
fmt.Fprintln(w, i18n.G("Slot\tPlug"))
wantedSnap := x.Positionals.Query.Snap
for _, slot := range ifaces.Slots {
if wantedSnap != "" {
var ok bool
if wantedSnap == slot.Snap {
ok = true
}
// Normally snap nicknames are handled internally in the snapd
// layer. This specific command is an exception as it does
// client-side filtering. As a special case, when the user asked
// for the snap "core" but we see the "system" nickname or the
// "snapd" snap, treat that as a match.
//
// The system nickname was returned in 2.35.
// The snapd snap is returned by 2.36+ if snapd snap is installed
// and is the host for implicit interfaces.
if (wantedSnap == "core" || wantedSnap == "snapd" || wantedSnap == "system") && (slot.Snap == "core" || slot.Snap == "snapd" || slot.Snap == "system") {
ok = true
}
for i := 0; i < len(slot.Connections) && !ok; i++ {
if wantedSnap == slot.Connections[i].Snap {
ok = true
}
}
if !ok {
continue
}
}
if x.Positionals.Query.Name != "" && x.Positionals.Query.Name != slot.Name {
continue
}
if x.Interface != "" && slot.Interface != x.Interface {
continue
}
// There are two special snaps, the "core" and "snapd" snaps are
// abbreviated to an empty snap name. The "system" snap name is still
// here in case we talk to older snapd for some reason.
if slot.Snap == "core" || slot.Snap == "snapd" || slot.Snap == "system" {
fmt.Fprintf(w, ":%s\t", slot.Name)
} else {
fmt.Fprintf(w, "%s:%s\t", slot.Snap, slot.Name)
}
for i := 0; i < len(slot.Connections); i++ {
if i > 0 {
fmt.Fprint(w, ",")
}
if slot.Connections[i].Name != slot.Name {
fmt.Fprintf(w, "%s:%s", slot.Connections[i].Snap, slot.Connections[i].Name)
} else {
fmt.Fprintf(w, "%s", slot.Connections[i].Snap)
}
}
// Display visual indicator for disconnected slots
if len(slot.Connections) == 0 {
fmt.Fprint(w, "-")
}
fmt.Fprintf(w, "\n")
}
// Plugs are treated differently. Since the loop above already printed each connected
// plug, the loop below focuses on printing just the disconnected plugs.
for _, plug := range ifaces.Plugs {
if wantedSnap != "" {
if wantedSnap != plug.Snap {
continue
}
}
if x.Positionals.Query.Name != "" && x.Positionals.Query.Name != plug.Name {
continue
}
if x.Interface != "" && plug.Interface != x.Interface {
continue
}
// Display visual indicator for disconnected plugs.
if len(plug.Connections) == 0 {
fmt.Fprintf(w, "-\t%s:%s\n", plug.Snap, plug.Name)
}
}
return nil
}
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