[PATCH 11/44] test: add heuristic for guessing labgrid environment YAML

[Ahmad Fatoum <a.fatoum@barebox.org>]

Now that each defconfig in barebox has its name carried into the build
.config, we can teach pytest to query that and find out what labgrid
environment YAML to use if none was specified by the user.

That means when building e.g., multi_v8_defconfig, it's enough to just
run pytest without arguments.

Signed-off-by: Ahmad Fatoum <a.fatoum@barebox.org>
---
 common/Kconfig |  4 ++++
 conftest.py    | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/common/Kconfig b/common/Kconfig
index 159cd271d748..21ce2ef97f2c 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -120,6 +120,10 @@ config NAME
 	  version command, but does not influence any runtime or
 	  compile-time behavior.
 
+	  For testing, pytest will use this option to determine, which
+	  Labgrid environment YAML to use if none was specified by the
+	  user.
+
 config LOCALVERSION
 	string "Local version - append to the version string"
 	help
diff --git a/conftest.py b/conftest.py
index e8de5952efb4..06321c938dba 100644
--- a/conftest.py
+++ b/conftest.py
@@ -26,6 +26,45 @@ def barebox_config(request, strategy, target):
     command = target.get_driver("BareboxDriver")
     return helper.get_config(command)
 
+
+def get_enabled_arch(config):
+    # Get the absolute path to the directory containing this script
+    base_dir = os.path.dirname(os.path.abspath(__file__))
+
+    # Path to the 'arch' directory relative to this script
+    arch_dir = os.path.join(base_dir, "arch")
+
+    if not os.path.isdir(arch_dir):
+        return None
+
+    # Optional mapping from directory names to config key suffixes
+    arch_map = {"powerpc": "ppc"}
+
+    for entry in os.listdir(arch_dir):
+        path = os.path.join(arch_dir, entry)
+        if os.path.isdir(path):
+            key_suffix = arch_map.get(entry, entry).upper()
+            config_key = f"CONFIG_{key_suffix}"
+            if config.get(config_key):
+                return entry
+
+    return None
+
+
+def guess_lg_env():
+    config_file = helper.open_config_file(os.environ['LG_BUILDDIR'] + "/.config")
+    config = helper.parse_config(config_file)
+    if not config or not config.get('CONFIG_NAME'):
+        return None
+    arch = get_enabled_arch(config)
+    if not arch:
+        return None
+    filename = os.path.join("test", arch, f"{config['CONFIG_NAME']}.yaml")
+    if os.path.exists(filename):
+        return filename
+    return None
+
+
 def pytest_configure(config):
     if 'LG_BUILDDIR' not in os.environ:
         if 'KBUILD_OUTPUT' in os.environ:
@@ -38,6 +77,14 @@ def pytest_configure(config):
     if os.environ['LG_BUILDDIR'] is not None:
         os.environ['LG_BUILDDIR'] = os.path.realpath(os.environ['LG_BUILDDIR'])
 
+    lg_env = config.option.lg_env
+    if lg_env is None:
+        lg_env = os.environ.get('LG_ENV')
+    if lg_env is None:
+        if lg_env := guess_lg_env():
+            os.environ['LG_ENV'] = lg_env
+
+
 def pytest_addoption(parser):
     def assignment(arg):
             return arg.split('=', 1)
-- 
2.39.5