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cmd_interface.go
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cmd_interface.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2017 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 (
"encoding/json"
"fmt"
"io"
"sort"
"text/tabwriter"
"github.com/jessevdk/go-flags"
"github.com/snapcore/snapd/client"
"github.com/snapcore/snapd/i18n"
)
type cmdInterface struct {
clientMixin
ShowAttrs bool `long:"attrs"`
ShowAll bool `long:"all"`
Positionals struct {
Interface interfaceName `skip-help:"true"`
} `positional-args:"true"`
}
var shortInterfaceHelp = i18n.G("Show details of snap interfaces")
var longInterfaceHelp = i18n.G(`
The interface command shows details of snap interfaces.
If no interface name is provided, a list of interface names with at least
one connection is shown, or a list of all interfaces if --all is provided.
`)
func init() {
addCommand("interface", shortInterfaceHelp, longInterfaceHelp, func() flags.Commander {
return &cmdInterface{}
}, map[string]string{
// TRANSLATORS: This should not start with a lowercase letter.
"attrs": i18n.G("Show interface attributes"),
// TRANSLATORS: This should not start with a lowercase letter.
"all": i18n.G("Include unused interfaces"),
}, []argDesc{{
// TRANSLATORS: This needs to begin with < and end with >
name: i18n.G("<interface>"),
// TRANSLATORS: This should not start with a lowercase letter.
desc: i18n.G("Show details of a specific interface"),
}})
}
func (x *cmdInterface) Execute(args []string) error {
if len(args) > 0 {
return ErrExtraArgs
}
if x.Positionals.Interface != "" {
// Show one interface in detail.
name := string(x.Positionals.Interface)
ifaces, err := x.client.Interfaces(&client.InterfaceOptions{
Names: []string{name},
Doc: true,
Plugs: true,
Slots: true,
})
if err != nil {
return err
}
if len(ifaces) == 0 {
return fmt.Errorf(i18n.G("no such interface"))
}
x.showOneInterface(ifaces[0])
} else {
// Show an overview of available interfaces.
ifaces, err := x.client.Interfaces(&client.InterfaceOptions{
Connected: !x.ShowAll,
})
if err != nil {
return err
}
if len(ifaces) == 0 {
if x.ShowAll {
return fmt.Errorf(i18n.G("no interfaces found"))
}
return fmt.Errorf(i18n.G("no interfaces currently connected"))
}
x.showManyInterfaces(ifaces)
}
return nil
}
func (x *cmdInterface) showOneInterface(iface *client.Interface) {
w := tabwriter.NewWriter(Stdout, 2, 2, 1, ' ', 0)
defer w.Flush()
fmt.Fprintf(w, "name:\t%s\n", iface.Name)
if iface.Summary != "" {
fmt.Fprintf(w, "summary:\t%s\n", iface.Summary)
}
if iface.DocURL != "" {
fmt.Fprintf(w, "documentation:\t%s\n", iface.DocURL)
}
if len(iface.Plugs) > 0 {
fmt.Fprintf(w, "plugs:\n")
for _, plug := range iface.Plugs {
var labelPart string
if plug.Label != "" {
labelPart = fmt.Sprintf(" (%s)", plug.Label)
}
if plug.Name == iface.Name {
fmt.Fprintf(w, " - %s%s", plug.Snap, labelPart)
} else {
fmt.Fprintf(w, ` - %s:%s%s`, plug.Snap, plug.Name, labelPart)
}
// Print a colon which will make the snap:plug element a key-value
// yaml object so that we can write the attributes.
if len(plug.Attrs) > 0 && x.ShowAttrs {
fmt.Fprintf(w, ":\n")
x.showAttrs(w, plug.Attrs, " ")
} else {
fmt.Fprintf(w, "\n")
}
}
}
if len(iface.Slots) > 0 {
fmt.Fprintf(w, "slots:\n")
for _, slot := range iface.Slots {
var labelPart string
if slot.Label != "" {
labelPart = fmt.Sprintf(" (%s)", slot.Label)
}
if slot.Name == iface.Name {
fmt.Fprintf(w, " - %s%s", slot.Snap, labelPart)
} else {
fmt.Fprintf(w, ` - %s:%s%s`, slot.Snap, slot.Name, labelPart)
}
// Print a colon which will make the snap:slot element a key-value
// yaml object so that we can write the attributes.
if len(slot.Attrs) > 0 && x.ShowAttrs {
fmt.Fprintf(w, ":\n")
x.showAttrs(w, slot.Attrs, " ")
} else {
fmt.Fprintf(w, "\n")
}
}
}
}
func (x *cmdInterface) showManyInterfaces(infos []*client.Interface) {
w := tabWriter()
defer w.Flush()
fmt.Fprintln(w, i18n.G("Name\tSummary"))
for _, iface := range infos {
fmt.Fprintf(w, "%s\t%s\n", iface.Name, iface.Summary)
}
}
func (x *cmdInterface) showAttrs(w io.Writer, attrs map[string]interface{}, indent string) {
if len(attrs) == 0 {
return
}
names := make([]string, 0, len(attrs))
for name := range attrs {
names = append(names, name)
}
sort.Strings(names)
for _, name := range names {
value := attrs[name]
switch value.(type) {
case string, bool, json.Number:
fmt.Fprintf(w, "%s %s:\t%v\n", indent, name, value)
}
}
}