add install and uninstall commands for systemd service

MANIFEST.in

@@ -1,3 +1,3 @@
 include LICENSE README.md
-recursive-include pyinotifyd/docs *
-recursive-include pyinotifyd/misc *
+recursive-include docs *
+recursive-include misc *

pyinotifyd/__init__.py

@@ -30,6 +30,8 @@ import sys
 
 from pyinotifyd.version import __version__ as version
 from pyinotifyd.watch import Watch, EventMap
+from pyinotifyd.install import install_systemd_service
+from pyinotifyd.install import uninstall_systemd_service
 
 
 class Pyinotifyd:
@@ -110,29 +112,42 @@ def main():
     parser.add_argument(
         "-c",
         "--config",
-        help=f"path to config file (defaults to /etc/{myname}/config.py)",
+        help=f"path to config file (default: /etc/{myname}/config.py)",
         default=f"/etc/{myname}/config.py")
     parser.add_argument(
         "-d",
         "--debug",
         help="log debugging messages",
         action="store_true")
-    parser.add_argument(
-        "-e",
-        "--events",
-        help="show event types and exit",
+
+    exclusive = parser.add_mutually_exclusive_group()
+    exclusive.add_argument(
+        "-l",
+        "--list",
+        help="show all usable event types and exit",
         action="store_true")
-    parser.add_argument(
+    exclusive.add_argument(
         "-v",
         "--version",
         help="show version and exit",
         action="store_true")
+    exclusive.add_argument(
+        "-i",
+        "--install",
+        help="install systemd service file",
+        action="store_true")
+    exclusive.add_argument(
+        "-u",
+        "--uninstall",
+        help="uninstall systemd service file",
+        action="store_true")
     args = parser.parse_args()
 
     if args.version:
         print(f"{myname} ({version})")
         sys.exit(0)
-    elif args.events:
+
+    if args.list:
         types = "\n".join(EventMap.flags.keys())
         print(types)
         sys.exit(0)
@@ -146,10 +161,16 @@ def main():
     root_logger.setLevel(loglevel)
 
     ch = logging.StreamHandler()
-    formatter = logging.Formatter("%(levelname)s - %(message)s")
+    formatter = logging.Formatter("%(levelname)s: %(message)s")
     ch.setFormatter(formatter)
     root_logger.addHandler(ch)
 
+    if args.install:
+        sys.exit(install_systemd_service(myname))
+
+    if args.uninstall:
+        sys.exit(uninstall_systemd_service(myname))
+
     try:
         config = {}
         exec(f"from {myname}.scheduler import *", config)

pyinotifyd/install.py

@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+
+# pyinotifyd is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# pyinotifyd is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with pyinotifyd.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import logging
+import os
+import shutil
+
+
+def check_root():
+    if os.getuid() != 0:
+        logging.error("you need to have root privileges to install "
+                      "the systemd service file, please try again")
+        return False
+
+    return True
+
+
+def check_systemd():
+    if not check_root():
+        return False
+
+    if not os.path.isdir("/usr/lib/systemd/system"):
+        logging.error("systemd is not running on your system")
+        return False
+
+    return True
+
+
+def install_systemd_service(name):
+    if not check_systemd():
+        return 1
+
+    dst_path = "/usr/lib/systemd/system/{name}.service"
+
+    if os.path.exists(dst_path):
+        logging.error("systemd service file is already installed")
+        return 1
+
+    pkg_dir = os.path.dirname(__file__)
+    src_path = f"{pkg_dir}/docs/{name}.service"
+
+    try:
+        shutil.copy2(src_path, dst_path)
+    except Exception as e:
+        logging.error(f"unable to copy: {e}")
+        return 1
+
+    logging.info("systemd service file successfully installed")
+
+    return 0
+
+
+def uninstall_systemd_service(name):
+    if not check_systemd():
+        return 1
+
+    path = "/usr/lib/systemd/system/{name}.service"
+
+    if not os.path.exists(path):
+        logging.info("systemd service is not installed")
+        return 0
+
+    try:
+        os.remove(path)
+    except Exception as e:
+        logging.error(f"unable to delete: {e}")
+        return 1
+
+    return 0