ci: run tests in alpine vm

Alpine Linux uses musl libc so now accel-ppp is tested under musl

Currently, Alpine Linux doesn't provide a link to the latest stable version
so direct link to Alpine 3.20 is used

Improved musl support might be used to run on platforms like openwrt
without additional patches

1 files changed, 14 insertions, 3 deletions

diff --git a/tests/accel-pppd/pppoe/conftest.py b/tests/accel-pppd/pppoe/conftest.py
index 8ebaaed3..b3893200 100644
--- a/tests/accel-pppd/pppoe/conftest.py
+++ b/tests/accel-pppd/pppoe/conftest.py
@@ -1,5 +1,6 @@
-import pytest
+import pytest, subprocess, re
 from common import pppd_process
+from packaging.version import Version
 
 # pppd executable file name
 @pytest.fixture()
@@ -13,11 +14,21 @@ def pppd(pytestconfig):
 def pppd_config():
     return ""
 
+# determines which plugin is required - pppoe.so (pppd 2.5.0+) or rp-pppoe.so (pppd <2.5.0)
+def pppd_plugin_so(pppd):
+    command = [pppd, "--version"]
+    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
+    pppd_version = Version(re.search(r'\d+\.\d+\.\d+', result.stdout + result.stderr).group())
+    ref_version = Version("2.5.0")
+    if pppd_version >= ref_version:
+        return "pppoe.so"
+    else:
+        return "rp-pppoe.so"
 
 # pppd configuration as command line args
 @pytest.fixture()
-def pppd_args(pppd_config):
-    return pppd_config.split()
+def pppd_args(pppd_config, pppd):
+    return ("plugin " + pppd_plugin_so(pppd) + "\n" + pppd_config).split()
 
 
 # setup and teardown for tests that required running pppd (after accel-pppd)