First commit

core/sigtrap_posix.go

@@ -0,0 +1,79 @@
+// +build !windows
+
+package core
+
+import (
+	"io/ioutil"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+// trapSignalsPosix captures POSIX-only signals.
+func trapSignalsPosix() {
+	go func() {
+		sigchan := make(chan os.Signal, 1)
+		signal.Notify(sigchan, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGQUIT, syscall.SIGUSR1)
+
+		for sig := range sigchan {
+			switch sig {
+			case syscall.SIGTERM:
+				log.Println("[INFO] SIGTERM: Terminating process")
+				if PidFile != "" {
+					os.Remove(PidFile)
+				}
+				os.Exit(0)
+
+			case syscall.SIGQUIT:
+				log.Println("[INFO] SIGQUIT: Shutting down")
+				exitCode := executeShutdownCallbacks("SIGQUIT")
+				err := Stop()
+				if err != nil {
+					log.Printf("[ERROR] SIGQUIT stop: %v", err)
+					exitCode = 1
+				}
+				if PidFile != "" {
+					os.Remove(PidFile)
+				}
+				os.Exit(exitCode)
+
+			case syscall.SIGHUP:
+				log.Println("[INFO] SIGHUP: Hanging up")
+				err := Stop()
+				if err != nil {
+					log.Printf("[ERROR] SIGHUP stop: %v", err)
+				}
+
+			case syscall.SIGUSR1:
+				log.Println("[INFO] SIGUSR1: Reloading")
+
+				var updatedCaddyfile Input
+
+				caddyfileMu.Lock()
+				if caddyfile == nil {
+					// Hmm, did spawing process forget to close stdin? Anyhow, this is unusual.
+					log.Println("[ERROR] SIGUSR1: no Caddyfile to reload (was stdin left open?)")
+					caddyfileMu.Unlock()
+					continue
+				}
+				if caddyfile.IsFile() {
+					body, err := ioutil.ReadFile(caddyfile.Path())
+					if err == nil {
+						updatedCaddyfile = CaddyfileInput{
+							Filepath: caddyfile.Path(),
+							Contents: body,
+							RealFile: true,
+						}
+					}
+				}
+				caddyfileMu.Unlock()
+
+				err := Restart(updatedCaddyfile)
+				if err != nil {
+					log.Printf("[ERROR] SIGUSR1: %v", err)
+				}
+			}
+		}
+	}()
+}