Support Alpine Linux & OpenRC

Resolves #50

Author: tomalok

src/mount_efs/__init__.py

@@ -268,6 +268,7 @@
 ROCKY8_RELEASE_NAME = "Rocky Linux release 8"
 ALMALINUX8_RELEASE_NAME = "AlmaLinux release 8"
 AMAZON_LINUX_2022_RELEASE_NAME = "Amazon Linux release 2022"
+ALPINE_RELEASE_NAME = "Alpine Linux"
 
 SKIP_NO_LIBWRAP_RELEASES = [
     RHEL8_RELEASE_NAME,
@@ -280,6 +281,7 @@
     ROCKY8_RELEASE_NAME,
     AMAZON_LINUX_2022_RELEASE_NAME,
     ALMALINUX8_RELEASE_NAME,
+    ALPINE_RELEASE_NAME,
 ]
 
 # Multiplier for max read ahead buffer size
@@ -1310,6 +1312,11 @@ def get_init_system(comm_file="/proc/1/comm"):
                 init_system = f.read().strip()
         except IOError:
             logging.warning("Unable to read %s", comm_file)
+
+        # OpenRC init system manages services a little differently
+        if init_system == "init" and os.path.isfile("/sbin/openrc"):
+            init_system = "openrc-init"
+            logging.debug("Detected OpenRC init system")
     else:
         init_system = "launchd"
 
@@ -1369,6 +1376,24 @@ def start_watchdog(init_system):
         elif "start" in str(status):
             logging.debug("%s is already running", WATCHDOG_SERVICE)
 
+    elif init_system == "openrc-init":
+        proc = subprocess.Popen(
+            ["/sbin/service", WATCHDOG_SERVICE, "status"],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            close_fds=True,
+        )
+        status, _ = proc.communicate()
+        if "stopped" in str(status):
+            subprocess.Popen(
+                ["/sbin/service", WATCHDOG_SERVICE, "start"],
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.DEVNULL,
+                close_fds=True,
+            )
+        elif "started" in str(status):
+            logging.debug("%s is already running", WATCHDOG_SERVICE)
+
     elif init_system == "systemd":
         rc = subprocess.call(
             ["systemctl", "is-active", "--quiet", WATCHDOG_SERVICE], close_fds=True