Add Linux uname collector.

This creates a single metric like:

node_uname_info{domainname="(none)",machine="x86_64",nodename="desktop",release="3.16.0-48-generic",sysname="Linux",version="#64~14.04.1-Ubuntu SMP Thu Aug 20 23:03:57 UTC 2015"} 1

1 files changed, 63 insertions, 0 deletions

diff --git a/collector/uname_linux.go b/collector/uname_linux.go
new file mode 100644
index 0000000..768ac7a
--- /dev/null
+++ b/collector/uname_linux.go
@@ -0,0 +1,63 @@
+// +build !nouname
+
+package collector
+
+import (
+        "syscall"
+
+        "github.com/prometheus/client_golang/prometheus"
+)
+
+var unameDesc = prometheus.NewDesc(
+        prometheus.BuildFQName(Namespace, "uname", "info"),
+        "Labeled system information as provided by the uname system call.",
+        []string{
+                "sysname",
+                "release",
+                "version",
+                "machine",
+                "nodename",
+                "domainname",
+        },
+        nil,
+)
+
+type unameCollector struct{}
+
+func init() {
+        Factories["uname"] = newUnameCollector
+}
+
+// NewUnameCollector returns new unameCollector.
+func newUnameCollector() (Collector, error) {
+        return &unameCollector{}, nil
+}
+
+func intArrayToString(array [65]int8) string {
+        var str string
+        for _, a := range array {
+                if a == 0 {
+                        break
+                }
+                str += string(a)
+        }
+        return str
+}
+
+func (c unameCollector) Update(ch chan<- prometheus.Metric) error {
+        var uname syscall.Utsname
+        if err := syscall.Uname(&uname); err != nil {
+                return err
+        }
+
+        labelValues := []string{
+                intArrayToString(uname.Sysname),
+                intArrayToString(uname.Release),
+                intArrayToString(uname.Version),
+                intArrayToString(uname.Machine),
+                intArrayToString(uname.Nodename),
+                intArrayToString(uname.Domainname),
+        }
+        ch <- prometheus.MustNewConstMetric(unameDesc, prometheus.GaugeValue, 1, labelValues...)
+        return nil
+}