Source: fs.go in package github.com/prometheus/procfs/internal/fs

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"
)

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...)...)