pan3793 commented on code in PR #55238:
URL: https://github.com/apache/spark/pull/55238#discussion_r3049028848


##########
build/sbt-launch-lib.bash:
##########
@@ -182,6 +183,18 @@ run() {
   set -- "${residual_args[@]}"
   argumentCount=$#
 
+  # If MAVEN_MIRROR_URL is set, generate a repositories config so the SBT 
launcher
+  # resolves SBT and Scala through the mirror during the boot phase.
+  if [[ -n "$MAVEN_MIRROR_URL" ]]; then
+    local sbt_repo_config="$(mktemp /tmp/sbt-repositories.XXXXXX)"

Review Comment:
   it's a little bit hacky, users may want to configure more than one repo 
sometimes
   
   in Apache Celeborn, we allow users to have a 
`build/sbt-config/repositories-local` (ignored by Git), and provide several 
common templates
   
   https://github.com/apache/celeborn/blob/main/build/sbt-config/



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