node_exporter/collector/filesystem_linux.go
Brad Beam e3cf1d5187 Adding support for evaluating octal characters in mountpoint (#954)
Signed-off-by: Brad Beam <brad.beam@b-rad.info>
2018-06-06 16:49:19 +02:00

104 lines
2.8 KiB
Go

// Copyright 2015 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.
// +build !nofilesystem
package collector
import (
"bufio"
"os"
"strings"
"syscall"
"github.com/prometheus/common/log"
)
const (
defIgnoredMountPoints = "^/(dev|proc|sys|var/lib/docker)($|/)"
defIgnoredFSTypes = "^(autofs|binfmt_misc|cgroup|configfs|debugfs|devpts|devtmpfs|fusectl|hugetlbfs|mqueue|overlay|proc|procfs|pstore|rpc_pipefs|securityfs|sysfs|tracefs)$"
readOnly = 0x1 // ST_RDONLY
)
// GetStats returns filesystem stats.
func (c *filesystemCollector) GetStats() ([]filesystemStats, error) {
mps, err := mountPointDetails()
if err != nil {
return nil, err
}
stats := []filesystemStats{}
for _, labels := range mps {
if c.ignoredMountPointsPattern.MatchString(labels.mountPoint) {
log.Debugf("Ignoring mount point: %s", labels.mountPoint)
continue
}
if c.ignoredFSTypesPattern.MatchString(labels.fsType) {
log.Debugf("Ignoring fs type: %s", labels.fsType)
continue
}
buf := new(syscall.Statfs_t)
err := syscall.Statfs(labels.mountPoint, buf)
if err != nil {
stats = append(stats, filesystemStats{
labels: labels,
deviceError: 1,
})
log.Debugf("Error on statfs() system call for %q: %s", labels.mountPoint, err)
continue
}
var ro float64
if (buf.Flags & readOnly) != 0 {
ro = 1
}
stats = append(stats, filesystemStats{
labels: labels,
size: float64(buf.Blocks) * float64(buf.Bsize),
free: float64(buf.Bfree) * float64(buf.Bsize),
avail: float64(buf.Bavail) * float64(buf.Bsize),
files: float64(buf.Files),
filesFree: float64(buf.Ffree),
ro: ro,
})
}
return stats, nil
}
func mountPointDetails() ([]filesystemLabels, error) {
file, err := os.Open(procFilePath("mounts"))
if err != nil {
return nil, err
}
defer file.Close()
filesystems := []filesystemLabels{}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
parts := strings.Fields(scanner.Text())
// Ensure we handle the translation of \040 and \011
// as per fstab(5).
parts[1] = strings.Replace(parts[1], "\\040", " ", -1)
parts[1] = strings.Replace(parts[1], "\\011", "\t", -1)
filesystems = append(filesystems, filesystemLabels{
device: parts[0],
mountPoint: parts[1],
fsType: parts[2],
})
}
return filesystems, scanner.Err()
}