forked from snapcore/snapd
/
backend.go
58 lines (48 loc) · 1.73 KB
/
backend.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 backend implements the low-level primitives to manage the snaps and their installation on disk.
package backend
import (
"github.com/snapcore/snapd/snap"
"github.com/snapcore/snapd/snap/snapfile"
)
// Backend exposes all the low-level primitives to manage snaps and their installation on disk.
type Backend struct {
preseed bool
}
// Candidate is a test hook.
func (b Backend) Candidate(*snap.SideInfo) {}
// CurrentInfo is a test hook.
func (b Backend) CurrentInfo(*snap.Info) {}
// OpenSnapFile opens a snap blob returning both a snap.Info completed
// with sideInfo (if not nil) and a corresponding snap.Container.
// Assumes the file was verified beforehand or the user asked for --dangerous.
func OpenSnapFile(snapPath string, sideInfo *snap.SideInfo) (*snap.Info, snap.Container, error) {
snapf, err := snapfile.Open(snapPath)
if err != nil {
return nil, nil, err
}
info, err := snap.ReadInfoFromSnapFile(snapf, sideInfo)
if err != nil {
return nil, nil, err
}
return info, snapf, nil
}
func NewForPreseedMode() Backend {
return Backend{preseed: true}
}