[PATCH v7 07/15] config: Look up rpi config path in configuration file

[Milan Zamazal]

Let's introduce a configuration option for rpi configuration file path.
It may be arguable whether pipeline specific configurations belong to
the global configuration file.  But:

- Having a single configuration file is generally easier for the user.
- The original configuration via environment variables can be already
  considered global.
- This option points to other configuration files and it makes little
  sense to add another configuration file to the chain.

The configuration snippet:

  configuration:
    pipeline:
      rpi:
        config_file: FILENAME

Signed-off-by: Milan Zamazal <mzamazal at redhat.com>
---
 src/libcamera/pipeline/rpi/common/pipeline_base.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
index 1f13e523..739dc61a 100644
--- a/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
+++ b/src/libcamera/pipeline/rpi/common/pipeline_base.cpp
@@ -20,6 +20,7 @@
 #include <libcamera/property_ids.h>
 
 #include "libcamera/internal/camera_lens.h"
+#include "libcamera/internal/global_configuration.h"
 #include "libcamera/internal/ipa_manager.h"
 #include "libcamera/internal/v4l2_subdevice.h"
 
@@ -1102,7 +1103,12 @@ int CameraData::loadPipelineConfiguration()
 	/* Initial configuration of the platform, in case no config file is present */
 	platformPipelineConfigure({});
 
-	char const *configFromEnv = utils::secure_getenv("LIBCAMERA_RPI_CONFIG_FILE");
+	std::optional<std::string> configFile =
+		GlobalConfiguration::envOption("LIBCAMERA_RPI_CONFIG_FILE",
+					       "pipelines.rpi.config_file");
+	if (!configFile.has_value())
+		return 0;
+	char const *configFromEnv = configFile.value().c_str();
 	if (!configFromEnv || *configFromEnv == '\0')
 		return 0;
 
-- 
2.48.1