Allow to redefine SYSPATH through environment variable

The LIBOCXL_SYSPATH env variable can override the sys path. Can be
useful for containers

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>

2 files changed, 10 insertions, 0 deletions

diff --git a/README.md b/README.md
index 4fd7d42..6a4d209 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,11 @@ The following environment variables may be set (to 1 or "YES") to assist with de
 
 **LIBOCXL_VERBOSE_ERRORS_ALL** Force verbose errors to be emitted for any failed LibOCXL calls, unless explicitly disabled.
 
+
+For testing and/or assist in various environments, the following environment variable can also be set:
+
+**LIBOCXL_SYSPATH** Override the default path (/sys/class/ocxl) used by the library to read driver information.
+
 Patches may be submitted via Github pull requests. Please prepare your patches
 by running `make precommit` before committing your work, and addressing any warnings & errors reported.
 Patches must compile cleanly with the latest stable version of GCC to be accepted.
diff --git a/src/internal.c b/src/internal.c
index 0dd8e91..07eaa9d 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -53,6 +53,7 @@ pthread_mutex_t stderr_mutex = PTHREAD_MUTEX_INITIALIZER;
  *  - Check the LIBOCXL_INFO environment variable and output the info string
  *  - Check the LIBOCXL_TRACE_ALL environment variable and enable tracing_all
  *  - Check the LIBOCXL_VERBOSE_ERRORS_ALL environment variable and enable verbose_errors_all
+ *  - Check the LIBOCXL_SYSPATH environment variable and override sys_path
  */
 void libocxl_init()
 {
@@ -81,6 +82,10 @@ void libocxl_init()
 		verbose_errors = true;
 	}
 
+	val = getenv("LIBOCXL_SYSPATH");
+	if (val)
+		sys_path = val;
+
 	libocxl_inited = true;
 
 	pthread_mutex_unlock(&libocxl_inited_mutex);