From 5d4e20937982e449cba83f53f87bb2e1635faf7a Mon Sep 17 00:00:00 2001
From: Jasbir Harnal <jlh2av@virginia.edu>
Date: Wed, 8 May 2019 20:54:34 -0400
Subject: [PATCH] added check for LOG_PATH env var in camera manager so
 calibration can still be retrieved for log analysis

---
 camera/camera_manager.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/camera/camera_manager.cc b/camera/camera_manager.cc
index 4333b1c..0ca09fb 100644
--- a/camera/camera_manager.cc
+++ b/camera/camera_manager.cc
@@ -62,7 +62,11 @@ std::optional<int> CameraManager::follow_v4l_path(const std::string& path) const
   const std::string v4l_path = fs::canonical(path, ec).string();
   const int index = v4l_path.back() - '0'; // note that this will break for >10 cameras
   if (ec) {
-    return std::nullopt;
+    if (getenv("LOG_PATH")) { // if LOG_PATH is set, we can assume that we're in playback mode and the video index won't be used
+      return 0;
+    } else {
+      return std::nullopt;
+    }
   } else {
     return index;
   }