[GitHub] [solr] janhoy commented on a diff in pull request #1225: SOLR-9509 Fix problems reported by shellcheck

[GitBox <gi...@apache.org>]

janhoy commented on code in PR #1225:
URL: https://github.com/apache/solr/pull/1225#discussion_r1063389460


##########
solr/bin/solr:
##########
@@ -2153,16 +2160,17 @@ function start_solr() {
   SOLR_JETTY_ADDL_CONFIG="$3"
 
   # define default GC_TUNE
-  if [ -z ${GC_TUNE+x} ]; then # I think this check is backwards?
-      GC_TUNE=('-XX:+UseG1GC' \
+  if [ -z "${GC_TUNE}" ]; then
+      GC_TUNE_ARR=('-XX:+UseG1GC' \

Review Comment:
   I tested this
   ```bash
   $ unset GC_TUNE  
   $ if [ -z "${GC_TUNE}" ]; then                                                                                              1 ↵  10130  13:11:57
     echo "DEFAULTS"
   else
     echo "OVERRIDE"
   fi
   DEFAULTS
   
   $ GC_TUNE=foo
   $ if [ -z "${GC_TUNE}" ]; then                                                                                                ✔  10128  13:11:28
     echo "DEFAULTS"
   else
     echo "OVERRIDE"
   fi
   OVERRIDE
   ```



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