mirror of https://github.com/docker/cli.git
56 lines
1.7 KiB
Go
56 lines
1.7 KiB
Go
|
// Copyright 2019 The Prometheus 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 fs
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
"path/filepath"
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
// DefaultProcMountPoint is the common mount point of the proc filesystem.
|
||
|
|
DefaultProcMountPoint = "/proc"
|
||
|
|
|
||
|
|
// DefaultSysMountPoint is the common mount point of the sys filesystem.
|
||
|
|
DefaultSysMountPoint = "/sys"
|
||
|
|
|
||
|
|
// DefaultConfigfsMountPoint is the common mount point of the configfs
|
||
|
|
DefaultConfigfsMountPoint = "/sys/kernel/config"
|
||
|
|
)
|
||
|
|
|
||
|
|
// FS represents a pseudo-filesystem, normally /proc or /sys, which provides an
|
||
|
|
// interface to kernel data structures.
|
||
|
|
type FS string
|
||
|
|
|
||
|
|
// NewFS returns a new FS mounted under the given mountPoint. It will error
|
||
|
|
// if the mount point can't be read.
|
||
|
|
func NewFS(mountPoint string) (FS, error) {
|
||
|
|
info, err := os.Stat(mountPoint)
|
||
|
|
if err != nil {
|
||
|
|
return "", fmt.Errorf("could not read %s: %s", mountPoint, err)
|
||
|
|
}
|
||
|
|
if !info.IsDir() {
|
||
|
|
return "", fmt.Errorf("mount point %s is not a directory", mountPoint)
|
||
|
|
}
|
||
|
|
|
||
|
|
return FS(mountPoint), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Path appends the given path elements to the filesystem path, adding separators
|
||
|
|
// as necessary.
|
||
|
|
func (fs FS) Path(p ...string) string {
|
||
|
|
return filepath.Join(append([]string{string(fs)}, p...)...)
|
||
|
|
}
|