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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 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 kernel
import (
"fmt"
"path/filepath"
"strings"
"github.com/snapcore/snapd/osutil"
)
func validateAssetsContent(kernelRoot string, info *Info) error {
// bare structure content is checked to exist during layout
// make sure that filesystem content source paths exist as well
for name, as := range info.Assets {
for _, assetContent := range as.Content {
c := assetContent
// a single trailing / is allowed and indicates a directory
isDir := strings.HasSuffix(c, "/")
if isDir {
c = strings.TrimSuffix(c, "/")
}
if filepath.Clean(c) != c || strings.Contains(c, "..") || c == "/" {
return fmt.Errorf("asset %q: invalid content %q", name, assetContent)
}
realSource := filepath.Join(kernelRoot, c)
if !osutil.FileExists(realSource) {
return fmt.Errorf("asset %q: content %q source path does not exist", name, assetContent)
}
if isDir {
// expecting a directory
if !osutil.IsDirectory(realSource + "/") {
return fmt.Errorf("asset %q: content %q is not a directory", name, assetContent)
}
}
}
}
return nil
}
// Validate checks whether the given directory contains valid kernel snap
// metadata and a matching content.
func Validate(kernelRoot string) error {
info, err := ReadInfo(kernelRoot)
if err != nil {
return fmt.Errorf("invalid kernel metadata: %v", err)
}
if err := validateAssetsContent(kernelRoot, info); err != nil {
return err
}
return nil
}
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