Moved system package inputs out to top level (#4406)

plugins/inputs/disk/disk.go

@@ -0,0 +1,113 @@
+package disk
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
+)
+
+type DiskStats struct {
+	ps system.PS
+
+	// Legacy support
+	Mountpoints []string
+
+	MountPoints []string
+	IgnoreFS    []string `toml:"ignore_fs"`
+}
+
+func (_ *DiskStats) Description() string {
+	return "Read metrics about disk usage by mount point"
+}
+
+var diskSampleConfig = `
+  ## By default stats will be gathered for all mount points.
+  ## Set mount_points will restrict the stats to only the specified mount points.
+  # mount_points = ["/"]
+
+  ## Ignore mount points by filesystem type.
+  ignore_fs = ["tmpfs", "devtmpfs", "devfs", "overlay", "aufs", "squashfs"]
+`
+
+func (_ *DiskStats) SampleConfig() string {
+	return diskSampleConfig
+}
+
+func (s *DiskStats) Gather(acc telegraf.Accumulator) error {
+	// Legacy support:
+	if len(s.Mountpoints) != 0 {
+		s.MountPoints = s.Mountpoints
+	}
+
+	disks, partitions, err := s.ps.DiskUsage(s.MountPoints, s.IgnoreFS)
+	if err != nil {
+		return fmt.Errorf("error getting disk usage info: %s", err)
+	}
+
+	for i, du := range disks {
+		if du.Total == 0 {
+			// Skip dummy filesystem (procfs, cgroupfs, ...)
+			continue
+		}
+		mountOpts := parseOptions(partitions[i].Opts)
+		tags := map[string]string{
+			"path":   du.Path,
+			"device": strings.Replace(partitions[i].Device, "/dev/", "", -1),
+			"fstype": du.Fstype,
+			"mode":   mountOpts.Mode(),
+		}
+		var used_percent float64
+		if du.Used+du.Free > 0 {
+			used_percent = float64(du.Used) /
+				(float64(du.Used) + float64(du.Free)) * 100
+		}
+
+		fields := map[string]interface{}{
+			"total":        du.Total,
+			"free":         du.Free,
+			"used":         du.Used,
+			"used_percent": used_percent,
+			"inodes_total": du.InodesTotal,
+			"inodes_free":  du.InodesFree,
+			"inodes_used":  du.InodesUsed,
+		}
+		acc.AddGauge("disk", fields, tags)
+	}
+
+	return nil
+}
+
+type MountOptions []string
+
+func (opts MountOptions) Mode() string {
+	if opts.exists("rw") {
+		return "rw"
+	} else if opts.exists("ro") {
+		return "ro"
+	} else {
+		return "unknown"
+	}
+}
+
+func (opts MountOptions) exists(opt string) bool {
+	for _, o := range opts {
+		if o == opt {
+			return true
+		}
+	}
+	return false
+}
+
+func parseOptions(opts string) MountOptions {
+	return strings.Split(opts, ",")
+}
+
+func init() {
+	ps := system.NewSystemPS()
+	inputs.Add("disk", func() telegraf.Input {
+		return &DiskStats{ps: ps}
+	})
+}