github.com/meulengracht/snapd@v0.0.0-20210719210640-8bde69bcc84e/overlord/hookstate/ctlcmd/services.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2018 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package ctlcmd
    21  
    22  import (
    23  	"errors"
    24  	"fmt"
    25  	"sort"
    26  	"text/tabwriter"
    27  
    28  	"github.com/snapcore/snapd/client/clientutil"
    29  	"github.com/snapcore/snapd/i18n"
    30  	"github.com/snapcore/snapd/overlord/servicestate"
    31  	"github.com/snapcore/snapd/progress"
    32  	"github.com/snapcore/snapd/snap"
    33  )
    34  
    35  var (
    36  	shortServicesHelp = i18n.G("Query the status of services")
    37  	longServicesHelp  = i18n.G(`
    38  The services command lists information about the services specified.
    39  `)
    40  )
    41  
    42  func init() {
    43  	addCommand("services", shortServicesHelp, longServicesHelp, func() command { return &servicesCommand{} })
    44  }
    45  
    46  type servicesCommand struct {
    47  	baseCommand
    48  	Positional struct {
    49  		ServiceNames []string `positional-arg-name:"<service>"`
    50  	} `positional-args:"yes"`
    51  }
    52  
    53  var errNoContextForServices = errors.New(i18n.G("cannot query services without a context"))
    54  
    55  type byApp []*snap.AppInfo
    56  
    57  func (a byApp) Len() int      { return len(a) }
    58  func (a byApp) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
    59  func (a byApp) Less(i, j int) bool {
    60  	return a[i].Name < a[j].Name
    61  }
    62  
    63  func (c *servicesCommand) Execute([]string) error {
    64  	context := c.context()
    65  	if context == nil {
    66  		return errNoContextForServices
    67  	}
    68  
    69  	st := context.State()
    70  	svcInfos, err := getServiceInfos(st, context.InstanceName(), c.Positional.ServiceNames)
    71  	if err != nil {
    72  		return err
    73  	}
    74  	sort.Sort(byApp(svcInfos))
    75  
    76  	sd := servicestate.NewStatusDecorator(progress.Null)
    77  
    78  	services, err := clientutil.ClientAppInfosFromSnapAppInfos(svcInfos, sd)
    79  	if err != nil || len(services) == 0 {
    80  		return err
    81  	}
    82  
    83  	w := tabwriter.NewWriter(c.stdout, 5, 3, 2, ' ', 0)
    84  	defer w.Flush()
    85  
    86  	fmt.Fprintln(w, i18n.G("Service\tStartup\tCurrent\tNotes"))
    87  
    88  	for _, svc := range services {
    89  		startup := i18n.G("disabled")
    90  		if svc.Enabled {
    91  			startup = i18n.G("enabled")
    92  		}
    93  		current := i18n.G("inactive")
    94  		if svc.DaemonScope == snap.UserDaemon {
    95  			current = "-"
    96  		} else if svc.Active {
    97  			current = i18n.G("active")
    98  		}
    99  		fmt.Fprintf(w, "%s.%s\t%s\t%s\t%s\n", svc.Snap, svc.Name, startup, current, clientutil.ClientAppInfoNotes(&svc))
   100  	}
   101  
   102  	return nil
   103  }