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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 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 policy
import (
"bytes"
"fmt"
"strings"
"github.com/snapcore/snapd/asserts"
"github.com/snapcore/snapd/interfaces"
"github.com/snapcore/snapd/interfaces/builtin"
)
const baseDeclarationHeader = `
type: base-declaration
authority-id: canonical
series: 16
revision: 0
`
const baseDeclarationPlugs = `
plugs:
`
const baseDeclarationSlots = `
slots:
`
func trimTrailingNewline(s string) string {
return strings.TrimRight(s, "\n")
}
// composeBaseDeclaration composes the headers of the builtin base-declaration
// describing the default interface policies for all snaps from each interface
// StaticInfo.BaseDeclarationSlots/BaseDeclarationPlgs.
// See interfaces/builtin/README.md
func composeBaseDeclaration(ifaces []interfaces.Interface) ([]byte, error) {
var buf bytes.Buffer
// Trim newlines at the end of the string. All the elements may have
// spurious trailing newlines. All elements start with a leading newline.
// We don't want any blanks as that would no longer parse.
if _, err := buf.WriteString(trimTrailingNewline(baseDeclarationHeader)); err != nil {
return nil, err
}
if _, err := buf.WriteString(trimTrailingNewline(baseDeclarationPlugs)); err != nil {
return nil, err
}
for _, iface := range ifaces {
plugPolicy := interfaces.StaticInfoOf(iface).BaseDeclarationPlugs
if _, err := buf.WriteString(trimTrailingNewline(plugPolicy)); err != nil {
return nil, err
}
}
if _, err := buf.WriteString(trimTrailingNewline(baseDeclarationSlots)); err != nil {
return nil, err
}
for _, iface := range ifaces {
slotPolicy := interfaces.StaticInfoOf(iface).BaseDeclarationSlots
if _, err := buf.WriteString(trimTrailingNewline(slotPolicy)); err != nil {
return nil, err
}
}
if _, err := buf.WriteRune('\n'); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func init() {
decl, err := composeBaseDeclaration(builtin.Interfaces())
if err != nil {
panic(fmt.Sprintf("cannot compose base-declaration: %v", err))
}
if err := asserts.InitBuiltinBaseDeclaration(decl); err != nil {
panic(fmt.Sprintf("cannot initialize the builtin base-declaration: %v", err))
}
}
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