github.com/tompreston/snapd@v0.0.0-20210817193607-954edfcb9611/cmd/snap/interfaces_common.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2014-2016 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  	"fmt"
    24  	"strings"
    25  
    26  	"github.com/snapcore/snapd/i18n"
    27  )
    28  
    29  // SnapAndName holds a snap name and a plug or slot name.
    30  type SnapAndName struct {
    31  	Snap string
    32  	Name string
    33  }
    34  
    35  // UnmarshalFlag unmarshals snap and plug or slot name.
    36  func (sn *SnapAndName) UnmarshalFlag(value string) error {
    37  	parts := strings.Split(value, ":")
    38  	sn.Snap = ""
    39  	sn.Name = ""
    40  	switch len(parts) {
    41  	case 1:
    42  		sn.Snap = parts[0]
    43  	case 2:
    44  		sn.Snap = parts[0]
    45  		sn.Name = parts[1]
    46  		// Reject "snap:" (that should be spelled as "snap")
    47  		if sn.Name == "" {
    48  			sn.Snap = ""
    49  		}
    50  	}
    51  	if sn.Snap == "" && sn.Name == "" {
    52  		return fmt.Errorf(i18n.G("invalid value: %q (want snap:name or snap)"), value)
    53  	}
    54  	return nil
    55  }