From c3b16c7b2ecc2b1b596b37d9a7744b838741482e Mon Sep 17 00:00:00 2001
From: Julius Volz <julius@soundcloud.com>
Date: Sun, 24 Apr 2016 18:30:15 +0200
Subject: [PATCH] Remove lastlogin collector.

See also https://github.com/prometheus/node_exporter/issues/229
---
 README.md                    |   1 -
 collector/lastlogin_linux.go | 112 -----------------------------------
 2 files changed, 113 deletions(-)
 delete mode 100644 collector/lastlogin_linux.go

diff --git a/README.md b/README.md
index 97cf1b86..3a3d3472 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,6 @@ gmond | Exposes statistics from Ganglia. | _any_
 interrupts | Exposes detailed interrupts statistics. | Linux, OpenBSD
 ipvs | Exposes IPVS status from `/proc/net/ip_vs` and stats from `/proc/net/ip_vs_stats`. | Linux
 ksmd | Exposes kernel and system statistics from `/sys/kernel/mm/ksm`. | Linux
-lastlogin | Exposes the last time there was a login. | _any_
 logind | Exposes session counts from [logind](http://www.freedesktop.org/wiki/Software/systemd/logind/). | Linux
 megacli | Exposes RAID statistics from MegaCLI. | Linux
 meminfo_numa | Exposes memory statistics from `/proc/meminfo_numa`. | Linux
diff --git a/collector/lastlogin_linux.go b/collector/lastlogin_linux.go
deleted file mode 100644
index 61ae5e93..00000000
--- a/collector/lastlogin_linux.go
+++ /dev/null
@@ -1,112 +0,0 @@
-// 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 !nolastlogin
-
-package collector
-
-import (
-	"bufio"
-	"fmt"
-	"io"
-	"os/exec"
-	"strings"
-	"time"
-
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/common/log"
-)
-
-const lastLoginSubsystem = "last_login"
-
-type lastLoginCollector struct {
-	metric prometheus.Gauge
-}
-
-func init() {
-	Factories["lastlogin"] = NewLastLoginCollector
-}
-
-// Takes a prometheus registry and returns a new Collector exposing
-// load, seconds since last login and a list of tags as specified by config.
-func NewLastLoginCollector() (Collector, error) {
-	return &lastLoginCollector{
-		metric: prometheus.NewGauge(prometheus.GaugeOpts{
-			Namespace: Namespace,
-			Subsystem: lastLoginSubsystem,
-			Name:      "time",
-			Help:      "The time of the last login.",
-		}),
-	}, nil
-}
-
-func (c *lastLoginCollector) Update(ch chan<- prometheus.Metric) (err error) {
-	last, err := getLastLoginTime()
-	if err != nil {
-		return fmt.Errorf("couldn't get last seen: %s", err)
-	}
-	log.Debugf("Set node_last_login_time: %f", last)
-	c.metric.Set(last)
-	c.metric.Collect(ch)
-	return err
-}
-
-func getLastLoginTime() (float64, error) {
-	who := exec.Command("who", "/var/log/wtmp", "-l", "-u", "-s")
-
-	output, err := who.StdoutPipe()
-	if err != nil {
-		return 0, err
-	}
-
-	err = who.Start()
-	if err != nil {
-		return 0, err
-	}
-
-	reader := bufio.NewReader(output)
-
-	var last time.Time
-	for {
-		line, isPrefix, err := reader.ReadLine()
-		if err == io.EOF {
-			break
-		}
-		if isPrefix {
-			return 0, fmt.Errorf("line to long: %s(...)", line)
-		}
-
-		fields := strings.Fields(string(line))
-		lastDate := fields[2]
-		lastTime := fields[3]
-
-		dateParts, err := splitToInts(lastDate, "-") // 2013-04-16
-		if err != nil {
-			return 0, fmt.Errorf("couldn't parse date in line '%s': %s", fields, err)
-		}
-
-		timeParts, err := splitToInts(lastTime, ":") // 11:33
-		if err != nil {
-			return 0, fmt.Errorf("couldn't parse time in line '%s': %s", fields, err)
-		}
-
-		last_t := time.Date(dateParts[0], time.Month(dateParts[1]), dateParts[2], timeParts[0], timeParts[1], 0, 0, time.UTC)
-		last = last_t
-	}
-	err = who.Wait()
-	if err != nil {
-		return 0, err
-	}
-
-	return float64(last.Unix()), nil
-}