JoshRosen commented on code in PR #36315:
URL: https://github.com/apache/spark/pull/36315#discussion_r855751881


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core/src/main/scala/org/apache/spark/security/ShellBasedGroupsMappingProvider.scala:
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@@ -36,10 +36,12 @@ private[spark] class ShellBasedGroupsMappingProvider 
extends GroupMappingService
     userGroups
   }
 
-  // shells out a "bash -c id -Gn username" to get user groups
+  // shells out a "id -Gn username" to get user groups
   private def getUnixGroups(username: String): Set[String] = {
-    val cmdSeq = Seq("bash", "-c", "id -Gn " + username)
+    val idPath = Utils.executeAndGetOutput("which" :: "id" :: Nil).stripLineEnd

Review Comment:
   Are you concerned about whether the `id` command might resolve differently 
in bash vs. the default shell? That's fair: it might be unlikely to be 
different, but maybe we want to play it safe.
   
   What do you think about caching the value in a `private lazy val` right 
before this method so we only invoke it once?



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