julien.rbrt.fr
kiss server monitoring tool with email alerts
go
monitoring
feat: add `--deamon` flag
+56
-4
main.go
+56
-4
main.go
···
3
3
import (
4
4
"fmt"
5
5
"os"
6
+
"os/exec"
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7
"path"
8
+
"runtime"
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9
8
10
"github.com/spf13/cobra"
9
11
)
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12
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13
var (
12
-
version = "1.0.0"
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-
flagConfig = "config"
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-
cfgFile string
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+
version = "1.0.0"
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+
flagConfig = "config"
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+
flagDaemon = "daemon"
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+
cfgFile string
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+
runAsDaemon bool
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)
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func main() {
···
23
27
24
28
rootCmd := &cobra.Command{
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Use: "servmon",
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-
Short: "Server Monitoring Tool with TUI and Alerts",
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+
Short: "KISS server monitoring tool with email alerts",
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Version: version,
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RunE: func(cmd *cobra.Command, args []string) error {
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+
runAsDaemon, err := cmd.Flags().GetBool(flagDaemon)
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+
if err != nil {
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+
return fmt.Errorf("error getting flag %s: %v", flagDaemon, err)
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+
}
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+
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if runAsDaemon {
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pid, err := runAsDaemonProcess()
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+
if err != nil {
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return err
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+
}
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+
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cmd.Println("Running as daemon with PID", pid)
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return nil
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+
}
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+
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cfgPath, err := cmd.Flags().GetString(flagConfig)
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if err != nil {
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return fmt.Errorf("error getting flag %s: %v", flagConfig, err)
···
59
78
60
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rootCmd.CompletionOptions.DisableDefaultCmd = true
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rootCmd.PersistentFlags().StringVar(&cfgFile, flagConfig, path.Join(homeDir, ".servmon.yaml"), "config file")
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+
rootCmd.PersistentFlags().BoolVarP(&runAsDaemon, flagDaemon, "d", false, "run as daemon")
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if err := rootCmd.Execute(); err != nil {
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fmt.Fprint(os.Stderr, err)
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os.Exit(1)
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}
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}
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+
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+
func runAsDaemonProcess() (int, error) {
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+
if runtime.GOOS == "linux" || runtime.GOOS == "freebsd" {
91
+
var args []string
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+
for _, a := range os.Args[1:] {
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+
if a != "-d" && a != "--daemon" {
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+
args = append(args, a)
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+
}
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+
}
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+
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+
cmd := exec.Command(os.Args[0], args...)
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+
cmd.Stdout = os.NewFile(3, "log.out")
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+
cmd.Stderr = os.NewFile(4, "log.err")
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+
cmd.Stdin = os.NewFile(3, "log.in")
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+
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+
if err := cmd.Start(); err != nil {
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+
return 0, fmt.Errorf("error starting as daemon: %v", err)
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+
}
106
+
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+
pid := cmd.Process.Pid
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+
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+
// Detach the process
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+
err := cmd.Process.Release()
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+
if err != nil {
112
+
return 0, fmt.Errorf("error detaching process: %v", err)
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+
}
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+
115
+
return pid, nil
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+
}
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+
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+
return 0, fmt.Errorf("daemon mode is not supported on %s", runtime.GOOS)
119
+
}