gopkg.in/ubuntu-core/snappy.v0@v0.0.0-20210902073436-25a8614f10a6/boot/errors.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2020 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 boot
    21  
    22  import (
    23  	"errors"
    24  	"fmt"
    25  )
    26  
    27  // trySnapError is an error that only applies to the try snaps where multiple
    28  // snaps are returned, this is mainly and primarily used in revisions().
    29  type trySnapError string
    30  
    31  func (sre trySnapError) Error() string {
    32  	return string(sre)
    33  }
    34  
    35  func newTrySnapErrorf(format string, args ...interface{}) error {
    36  	return trySnapError(fmt.Sprintf(format, args...))
    37  }
    38  
    39  // isTrySnapError returns true if the given error is an error resulting from
    40  // accessing information about the try snap or the trying status.
    41  func isTrySnapError(err error) bool {
    42  	switch err.(type) {
    43  	case trySnapError:
    44  		return true
    45  	}
    46  	return false
    47  }
    48  
    49  var errTrySnapFallback = errors.New("fallback to original snap")