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khenaidoo59ce9dd2019-11-11 13:05:32 -05001// Copyright 2019 The Prometheus Authors
2// Licensed under the Apache License, Version 2.0 (the "License");
3// you may not use this file except in compliance with the License.
4// You may obtain a copy of the License at
5//
6// http://www.apache.org/licenses/LICENSE-2.0
7//
8// Unless required by applicable law or agreed to in writing, software
9// distributed under the License is distributed on an "AS IS" BASIS,
10// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11// See the License for the specific language governing permissions and
12// limitations under the License.
13
14package fs
15
16import (
17 "fmt"
18 "os"
19 "path/filepath"
20)
21
22const (
23 // DefaultProcMountPoint is the common mount point of the proc filesystem.
24 DefaultProcMountPoint = "/proc"
25
26 // DefaultSysMountPoint is the common mount point of the sys filesystem.
27 DefaultSysMountPoint = "/sys"
28)
29
30// FS represents a pseudo-filesystem, normally /proc or /sys, which provides an
31// interface to kernel data structures.
32type FS string
33
34// NewFS returns a new FS mounted under the given mountPoint. It will error
35// if the mount point can't be read.
36func NewFS(mountPoint string) (FS, error) {
37 info, err := os.Stat(mountPoint)
38 if err != nil {
39 return "", fmt.Errorf("could not read %s: %s", mountPoint, err)
40 }
41 if !info.IsDir() {
42 return "", fmt.Errorf("mount point %s is not a directory", mountPoint)
43 }
44
45 return FS(mountPoint), nil
46}
47
48// Path appends the given path elements to the filesystem path, adding separators
49// as necessary.
50func (fs FS) Path(p ...string) string {
51 return filepath.Join(append([]string{string(fs)}, p...)...)
52}