mirror of
https://github.com/prometheus/node_exporter.git
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83 lines
2.3 KiB
Go
83 lines
2.3 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package sysfs
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import (
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"fmt"
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"os"
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"path/filepath"
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"github.com/prometheus/procfs/xfs"
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)
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// FS represents the pseudo-filesystem sys, which provides an interface to
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// kernel data structures.
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type FS string
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// DefaultMountPoint is the common mount point of the sys filesystem.
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const DefaultMountPoint = "/sys"
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// NewFS returns a new FS mounted under the given mountPoint. It will error
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// if the mount point can't be read.
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func NewFS(mountPoint string) (FS, error) {
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info, err := os.Stat(mountPoint)
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if err != nil {
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return "", fmt.Errorf("could not read %s: %s", mountPoint, err)
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}
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if !info.IsDir() {
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return "", fmt.Errorf("mount point %s is not a directory", mountPoint)
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}
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return FS(mountPoint), nil
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}
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// Path returns the path of the given subsystem relative to the sys root.
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func (fs FS) Path(p ...string) string {
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return filepath.Join(append([]string{string(fs)}, p...)...)
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}
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// XFSStats retrieves XFS filesystem runtime statistics for each mounted XFS
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// filesystem. Only available on kernel 4.4+. On older kernels, an empty
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// slice of *xfs.Stats will be returned.
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func (fs FS) XFSStats() ([]*xfs.Stats, error) {
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matches, err := filepath.Glob(fs.Path("fs/xfs/*/stats/stats"))
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if err != nil {
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return nil, err
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}
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stats := make([]*xfs.Stats, 0, len(matches))
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for _, m := range matches {
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f, err := os.Open(m)
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if err != nil {
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return nil, err
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}
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// "*" used in glob above indicates the name of the filesystem.
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name := filepath.Base(filepath.Dir(filepath.Dir(m)))
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// File must be closed after parsing, regardless of success or
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// failure. Defer is not used because of the loop.
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s, err := xfs.ParseStats(f)
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_ = f.Close()
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if err != nil {
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return nil, err
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}
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s.Name = name
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stats = append(stats, s)
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}
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return stats, nil
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}
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