Support sighup reload configuration files

Support podman service sighup reload configuration files(containers.conf, registries.conf, storage.conf).

Signed-off-by: Qi Wang <qiwan@redhat.com>

3 files changed, 54 insertions, 0 deletions

diff --git a/cmd/podman/system/service_abi.go b/cmd/podman/system/service_abi.go
index 6c6dd42a4..95cbd19d9 100644
--- a/cmd/podman/system/service_abi.go
+++ b/cmd/podman/system/service_abi.go
@@ -5,8 +5,12 @@ package system
 import (
 	"context"
 	"net"
+	"os"
+	"os/signal"
 	"strings"
 
+	"github.com/containers/podman/v2/cmd/podman/utils"
+	"github.com/containers/podman/v2/libpod"
 	api "github.com/containers/podman/v2/pkg/api/server"
 	"github.com/containers/podman/v2/pkg/domain/entities"
 	"github.com/containers/podman/v2/pkg/domain/infra"
@@ -39,6 +43,7 @@ func restService(opts entities.ServiceOptions, flags *pflag.FlagSet, cfg *entiti
 		return err
 	}
 
+	startWatcher(rt)
 	server, err := api.NewServerWithSettings(rt, opts.Timeout, listener)
 	if err != nil {
 		return err
@@ -55,3 +60,24 @@ func restService(opts entities.ServiceOptions, flags *pflag.FlagSet, cfg *entiti
 	}
 	return err
 }
+
+// startWatcher starts a new SIGHUP go routine for the current config.
+func startWatcher(rt *libpod.Runtime) {
+	// Setup the signal notifier
+	ch := make(chan os.Signal, 1)
+	signal.Notify(ch, utils.SIGHUP)
+
+	go func() {
+		for {
+			// Block until the signal is received
+			logrus.Debugf("waiting for SIGHUP to reload configuration")
+			<-ch
+			if err := rt.Reload(); err != nil {
+				logrus.Errorf("unable to reload configuration: %v", err)
+				continue
+			}
+		}
+	}()
+
+	logrus.Debugf("registered SIGHUP watcher for config")
+}
diff --git a/cmd/podman/utils/signals_linux.go b/cmd/podman/utils/signals_linux.go
new file mode 100644
index 000000000..f0a14aff0
--- /dev/null
+++ b/cmd/podman/utils/signals_linux.go
@@ -0,0 +1,14 @@
+// +build !windows
+
+package utils
+
+import (
+	"os"
+
+	"golang.org/x/sys/unix"
+)
+
+// Platform specific signal synonyms
+var (
+	SIGHUP os.Signal = unix.SIGHUP
+)
diff --git a/cmd/podman/utils/signals_windows.go b/cmd/podman/utils/signals_windows.go
new file mode 100644
index 000000000..30b058cb9
--- /dev/null
+++ b/cmd/podman/utils/signals_windows.go
@@ -0,0 +1,14 @@
+// +build windows
+
+package utils
+
+import (
+	"os"
+
+	"golang.org/x/sys/windows"
+)
+
+// Platform specific signal synonyms
+var (
+	SIGHUP os.Signal = windows.SIGHUP
+)