feat(playout): use liquidsoap version functions

- remove "packaging" package

playout/libretime_playout/liquidsoap/main.py

@@ -1,7 +1,6 @@
 """ Runs Airtime liquidsoap
 """
 import os
-import subprocess
 from pathlib import Path
 from typing import Optional
 
@@ -12,6 +11,7 @@ from libretime_shared.logging import level_from_name, setup_logger
 from loguru import logger
 
 from .entrypoint import generate_entrypoint
+from .version import get_liquidsoap_version
 
 
 @click.command(context_settings={"auto_envvar_prefix": DEFAULT_ENV_PREFIX})
@@ -25,14 +25,10 @@ def cli(log_level: int, log_filepath: Optional[Path]):
 
     generate_entrypoint(log_filepath)
 
-    # check liquidsoap version so we can run a scripts matching the liquidsoap minor version
-    liquidsoap_version = subprocess.check_output(
-        "liquidsoap 'print(liquidsoap.version) shutdown()'",
-        shell=True,
-        universal_newlines=True,
-    )[0:3]
+    version = get_liquidsoap_version()
+
     script_path = os.path.join(
-        os.path.dirname(__file__), liquidsoap_version, "ls_script.liq"
+        os.path.dirname(__file__), f"{version[0]}.{version[1]}", "ls_script.liq"
     )
     exec_args = [
         "/usr/bin/liquidsoap",
@@ -43,5 +39,5 @@ def cli(log_level: int, log_filepath: Optional[Path]):
     if log_level.is_debug():
         exec_args.append("--debug")
 
-    logger.debug(f"Liquidsoap {liquidsoap_version} using script: {script_path}")
+    logger.debug(f"Liquidsoap {version} using script: {script_path}")
     os.execl(*exec_args)

playout/libretime_playout/liquidsoap/version.py

@@ -0,0 +1,26 @@
+import re
+from subprocess import PIPE, run
+from typing import Tuple
+
+LIQUIDSOAP_VERSION_RE = re.compile(r"(?:Liquidsoap )?(\d+).(\d+).(\d+)")
+LIQUIDSOAP_MIN_VERSION = (1, 1, 1)
+
+
+def parse_liquidsoap_version(version: str) -> Tuple[int, int, int]:
+    match = LIQUIDSOAP_VERSION_RE.search(version)
+
+    if match is None:
+        return (0, 0, 0)
+    return (int(match.group(1)), int(match.group(2)), int(match.group(3)))
+
+
+def get_liquidsoap_version() -> Tuple[int, int, int]:
+    cmd = run(
+        ("liquidsoap", "--check", "print(liquidsoap.version) shutdown()"),
+        check=True,
+        stdout=PIPE,
+        stderr=PIPE,
+        universal_newlines=True,
+    )
+
+    return parse_liquidsoap_version(cmd.stdout)