github.com/david-imola/snapd@v0.0.0-20210611180407-2de8ddeece6d/overlord/snapstate/policy/errors.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2019 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 policy
    21  
    22  import (
    23  	"errors"
    24  	"strconv"
    25  	"strings"
    26  )
    27  
    28  var (
    29  	errNoName       = errors.New("snap has no name (not installed?)")
    30  	errInUseForBoot = errors.New("snap is being used for boot")
    31  	errRequired     = errors.New("snap is required")
    32  	errIsModel      = errors.New("snap is used by the model")
    33  
    34  	errSnapdNotRemovableOnCore       = errors.New("snapd required on core devices")
    35  	errSnapdNotYetRemovableOnClassic = errors.New("remove all other snaps first")
    36  
    37  	errEphemeralSnapsNotRemovalable = errors.New("no snaps are removable in any of the ephemeral modes")
    38  )
    39  
    40  type inUseByErr []string
    41  
    42  func (e inUseByErr) Error() string {
    43  	switch len(e) {
    44  	case 0:
    45  		// how
    46  		return "snap is being used"
    47  	case 1:
    48  		return "snap is being used by snap " + e[0] + "."
    49  	case 2, 3, 4, 5:
    50  		return "snap is being used by snaps " + strings.Join(e[:len(e)-1], ", ") + " and " + e[len(e)-1] + "."
    51  	default:
    52  		return "snap is being used by snaps " + strings.Join(e[:5], ", ") + " and " + strconv.Itoa(len(e)-5) + " more."
    53  	}
    54  }