Add boot time module

core/boottime.go

@@ -0,0 +1,41 @@
+/// Get system boot time
+/// should fail on not-linux
+
+package core
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Time = time.Time
+
+func GetBootTime() (Time, error) {
+	file, err := os.Open("/proc/stat")
+	if err != nil {
+		return Time{}, err
+	}
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		s_btime := "btime "
+		if strings.HasPrefix(line, s_btime) {
+			btime, err := strconv.ParseInt(line[len(s_btime):], 10, 64)
+			if err != nil {
+				return Time{}, err
+			}
+			return time.Unix(btime, 0), nil
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		return Time{}, err
+	}
+
+	return Time{}, fmt.Errorf("btime (boot time) not found in /proc/stat")
+}

proto/uptime/main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"git.exozy.me/exozyme/status/core"
+)
+
+func main() {
+	btime, err := core.GetBootTime()
+	if err!=nil {
+		log.Fatal(err)
+	}
+	fmt.Println(btime)
+}