mirror of
https://github.com/token2/snapd.git
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70 lines
2.1 KiB
Go
70 lines
2.1 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2016-2017 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 mount
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import (
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"fmt"
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"os/exec"
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"path/filepath"
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"github.com/snapcore/snapd/dirs"
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"github.com/snapcore/snapd/osutil"
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"github.com/snapcore/snapd/snapdtool"
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)
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// mountNsPath returns path of the mount namespace file of a given snap
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func mountNsPath(snapName string) string {
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// NOTE: This value has to be synchronized with snap-confine
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return filepath.Join(dirs.SnapRunNsDir, fmt.Sprintf("%s.mnt", snapName))
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}
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// Run an internal tool on a given snap namespace, if one exists.
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func runNamespaceTool(toolName, snapName string) ([]byte, error) {
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mntFile := mountNsPath(snapName)
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if osutil.FileExists(mntFile) {
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toolPath, err := snapdtool.InternalToolPath(toolName)
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if err != nil {
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return nil, err
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}
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cmd := exec.Command(toolPath, snapName)
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output, err := cmd.CombinedOutput()
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return output, err
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}
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return nil, nil
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}
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// Discard the mount namespace of a given snap.
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func DiscardSnapNamespace(snapName string) error {
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output, err := runNamespaceTool("snap-discard-ns", snapName)
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if err != nil {
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return fmt.Errorf("cannot discard preserved namespace of snap %q: %s", snapName, osutil.OutputErr(output, err))
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}
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return nil
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}
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// Update the mount namespace of a given snap.
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func UpdateSnapNamespace(snapName string) error {
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output, err := runNamespaceTool("snap-update-ns", snapName)
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if err != nil {
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return fmt.Errorf("cannot update preserved namespace of snap %q: %s", snapName, osutil.OutputErr(output, err))
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}
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return nil
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}
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