forked from snapcore/snapd
/
interfaces_common.go
87 lines (79 loc) · 2.12 KB
/
interfaces_common.go
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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2014-2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package main
import (
"fmt"
"strings"
)
// AttributePair contains a pair of key-value strings
type AttributePair struct {
// The key
Key string
// The value
Value string
}
// UnmarshalFlag parses a string into an AttributePair
func (ap *AttributePair) UnmarshalFlag(value string) error {
parts := strings.SplitN(value, "=", 2)
if len(parts) < 2 || parts[0] == "" {
ap.Key = ""
ap.Value = ""
return fmt.Errorf("invalid attribute: %q (want key=value)", value)
}
ap.Key = parts[0]
ap.Value = parts[1]
return nil
}
// AttributePairSliceToMap converts a slice of AttributePair into a map
func AttributePairSliceToMap(attrs []AttributePair) map[string]string {
result := make(map[string]string)
for _, attr := range attrs {
result[attr.Key] = attr.Value
}
return result
}
// SnapAndName holds a snap name and a plug or slot name.
type SnapAndName struct {
Snap string
Name string
}
// UnmarshalFlag unmarshals snap and plug or slot name.
func (sn *SnapAndName) UnmarshalFlag(value string) error {
parts := strings.Split(value, ":")
sn.Snap = ""
sn.Name = ""
switch len(parts) {
case 1:
sn.Snap = parts[0]
case 2:
sn.Snap = parts[0]
sn.Name = parts[1]
// Reject ":name" (that is invalid)
if sn.Snap == "" {
sn.Name = ""
}
// Reject "snap:" (that should be spelled as "snap")
if sn.Name == "" {
sn.Snap = ""
}
}
if sn.Snap == "" && sn.Name == "" {
return fmt.Errorf("invalid value: %q (want snap:name or snap)", value)
}
return nil
}