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// Copyright The Notary Project Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dir
import (
"io/fs"
"os"
"path/filepath"
)
// SysFS is virtual file system interface that support fs.FS and SysPath method.
type SysFS interface {
fs.FS
// SysPath returns the real system path of the given path items in the SysFS.
SysPath(items ...string) (string, error)
}
type sysFS struct {
fs.FS
root string
}
// SysPath returns the real system path of the given name in the SysFS.
func (s sysFS) SysPath(items ...string) (string, error) {
pathItems := []string{s.root}
pathItems = append(pathItems, items...)
return filepath.Join(pathItems...), nil
}
// NewSysFS returns the SysFS for the given root directory.
//
// Support one root directory for rc.1, and may support union directories FS
// after rc.1.
func NewSysFS(root string) SysFS {
return sysFS{
FS: os.DirFS(root),
root: root}
}
// ConfigFS is the config SysFS
func ConfigFS() SysFS {
return NewSysFS(userConfigDirPath())
}
// PluginFS is the plugin SysFS
func PluginFS() SysFS {
return NewSysFS(filepath.Join(userLibexecDirPath(), PathPlugins))
}
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