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https://github.com/token2/snapd.git
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5a0418459d
incorporate into it and update the patterns described in basedeclaration.go have a few relevant doc comments point to it * tweaks * interfaces: incorporate suggestions from @degville with some tweaks thanks * interfaces: incorporate fixes from @MiguelPires thanks
96 lines
2.8 KiB
Go
96 lines
2.8 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2016 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package policy
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import (
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"bytes"
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"fmt"
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"strings"
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"github.com/snapcore/snapd/asserts"
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"github.com/snapcore/snapd/interfaces"
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"github.com/snapcore/snapd/interfaces/builtin"
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)
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const baseDeclarationHeader = `
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type: base-declaration
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authority-id: canonical
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series: 16
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revision: 0
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`
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const baseDeclarationPlugs = `
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plugs:
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`
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const baseDeclarationSlots = `
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slots:
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`
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func trimTrailingNewline(s string) string {
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return strings.TrimRight(s, "\n")
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}
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// composeBaseDeclaration composes the headers of the builtin base-declaration
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// describing the default interface policies for all snaps from each interface
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// StaticInfo.BaseDeclarationSlots/BaseDeclarationPlgs.
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// See interfaces/builtin/README.md
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func composeBaseDeclaration(ifaces []interfaces.Interface) ([]byte, error) {
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var buf bytes.Buffer
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// Trim newlines at the end of the string. All the elements may have
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// spurious trailing newlines. All elements start with a leading newline.
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// We don't want any blanks as that would no longer parse.
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if _, err := buf.WriteString(trimTrailingNewline(baseDeclarationHeader)); err != nil {
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return nil, err
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}
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if _, err := buf.WriteString(trimTrailingNewline(baseDeclarationPlugs)); err != nil {
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return nil, err
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}
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for _, iface := range ifaces {
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plugPolicy := interfaces.StaticInfoOf(iface).BaseDeclarationPlugs
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if _, err := buf.WriteString(trimTrailingNewline(plugPolicy)); err != nil {
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return nil, err
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}
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}
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if _, err := buf.WriteString(trimTrailingNewline(baseDeclarationSlots)); err != nil {
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return nil, err
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}
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for _, iface := range ifaces {
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slotPolicy := interfaces.StaticInfoOf(iface).BaseDeclarationSlots
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if _, err := buf.WriteString(trimTrailingNewline(slotPolicy)); err != nil {
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return nil, err
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}
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}
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if _, err := buf.WriteRune('\n'); err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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func init() {
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decl, err := composeBaseDeclaration(builtin.Interfaces())
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if err != nil {
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panic(fmt.Sprintf("cannot compose base-declaration: %v", err))
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}
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if err := asserts.InitBuiltinBaseDeclaration(decl); err != nil {
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panic(fmt.Sprintf("cannot initialize the builtin base-declaration: %v", err))
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}
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}
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