github.com/meulengracht/snapd@v0.0.0-20210719210640-8bde69bcc84e/cmd/snap/cmd_watch.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2016 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 main
    21  
    22  import (
    23  	"github.com/jessevdk/go-flags"
    24  
    25  	"github.com/snapcore/snapd/i18n"
    26  )
    27  
    28  type cmdWatch struct{ changeIDMixin }
    29  
    30  var shortWatchHelp = i18n.G("Watch a change in progress")
    31  var longWatchHelp = i18n.G(`
    32  The watch command waits for the given change-id to finish and shows progress
    33  (if available).
    34  `)
    35  
    36  func init() {
    37  	addCommand("watch", shortWatchHelp, longWatchHelp, func() flags.Commander {
    38  		return &cmdWatch{}
    39  	}, changeIDMixinOptDesc, changeIDMixinArgDesc)
    40  }
    41  
    42  func (x *cmdWatch) Execute(args []string) error {
    43  	if len(args) > 0 {
    44  		return ErrExtraArgs
    45  	}
    46  	id, err := x.GetChangeID()
    47  	if err != nil {
    48  		if err == noChangeFoundOK {
    49  			return nil
    50  		}
    51  		return err
    52  	}
    53  
    54  	// this is the only valid use of wait without a waitMixin (ie
    55  	// without --no-wait), so we fake it here.
    56  	wmx := &waitMixin{skipAbort: true}
    57  	wmx.client = x.client
    58  	_, err = wmx.wait(id)
    59  
    60  	return err
    61  }