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setup.go
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setup.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
import (
"fmt"
"os"
"github.com/snapcore/snapd/boot"
"github.com/snapcore/snapd/progress"
"github.com/snapcore/snapd/snap"
)
// SetupSnap does prepare and mount the snap for further processing.
func (b Backend) SetupSnap(snapFilePath string, sideInfo *snap.SideInfo, meter progress.Meter) error {
// This assumes that the snap was already verified or devmode was requested.
s, snapf, err := OpenSnapFile(snapFilePath, sideInfo)
if err != nil {
return err
}
instdir := s.MountDir()
if err := os.MkdirAll(instdir, 0755); err != nil {
return err
}
if err := snapf.Install(s.MountFile(), instdir); err != nil {
return err
}
// generate the mount unit for the squashfs
if err := addMountUnit(s, meter); err != nil {
return err
}
// FIXME: special handling is bad 'mkay
if s.Type == snap.TypeKernel {
if err := boot.ExtractKernelAssets(s, meter); err != nil {
return fmt.Errorf("cannot install kernel: %s", err)
}
}
return err
}
// RemoveSnapFiles removes the snap files from the disk after unmounting the snap.
func (b Backend) RemoveSnapFiles(s snap.PlaceInfo, typ snap.Type, meter progress.Meter) error {
mountDir := s.MountDir()
// this also ensures that the mount unit stops
if err := removeMountUnit(mountDir, meter); err != nil {
return err
}
if err := os.RemoveAll(mountDir); err != nil {
return err
}
snapPath := s.MountFile()
// snapPath may either be a file or a (broken) symlink to a dir
if _, err := os.Lstat(snapPath); err == nil {
// remove the kernel assets (if any)
if typ == snap.TypeKernel {
if err := boot.RemoveKernelAssets(s, meter); err != nil {
return err
}
}
// remove the snap
if err := os.RemoveAll(snapPath); err != nil {
return err
}
}
return nil
}
// UndoSetupSnap undoes the work of SetupSnap using RemoveSnapFiles.
func (b Backend) UndoSetupSnap(s snap.PlaceInfo, typ snap.Type, meter progress.Meter) error {
return b.RemoveSnapFiles(s, typ, meter)
}