MNT: Check if running inside repo2docker more explicitly (scikit-learn#30835)

yuvipanda · lesteve · lesteve · commit 02ce5b224b4b · 2025-02-19T17:41:03.000+01:00
Co-authored-by: Loïc Estève &lt;loic.esteve@ymail.com&gt;
diff --git a/.binder/postBuild b/.binder/postBuild
@@ -6,9 +6,9 @@ set -e
 # inside a git checkout of the scikit-learn/scikit-learn repo. This script is
 # generating notebooks from the scikit-learn python examples.
 
-if [[ ! -f /.dockerenv ]]; then
-    echo "This script was written for repo2docker and is supposed to run inside a docker container."
-    echo "Exiting because this script can delete data if run outside of a docker container."
+if [[ -z "${REPO_DIR}" ]]; then
+    echo "This script was written for repo2docker and the REPO_DIR environment variable is supposed to be set."
+    echo "Exiting because this script can delete data if run outside of a repo2docker context."
     exit 1
 fi
 
