feat: allow overwrite opensearch home

Signed-off-by: Soner Sayakci <[email protected]>

CHANGELOG.md

@@ -46,6 +46,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Change http code on create index API with bad input raising NotXContentException from 500 to 400 ([#4773](https://github.com/opensearch-project/OpenSearch/pull/4773))
 - Change http code for DecommissioningFailedException from 500 to 400 ([#5283](https://github.com/opensearch-project/OpenSearch/pull/5283))
 - Improve summary error message for invalid setting updates ([#4792](https://github.com/opensearch-project/OpenSearch/pull/4792))
+- Changed `opensearch-env` to respect already set `OPENSEARCH_HOME` environment variable ([#6956](https://github.com/opensearch-project/OpenSearch/pull/6956/))
 
 ### Deprecated
 

distribution/src/bin/opensearch-env

@@ -28,18 +28,20 @@ while [ -h "$SCRIPT" ] ; do
   fi
 done
 
-# determine OpenSearch home; to do this, we strip from the path until we find
-# bin, and then strip bin (there is an assumption here that there is no nested
-# directory under bin also named bin)
-OPENSEARCH_HOME=`dirname "$SCRIPT"`
-
-# now make OPENSEARCH_HOME absolute
-OPENSEARCH_HOME=`cd "$OPENSEARCH_HOME"; pwd`
-
-while [ "`basename "$OPENSEARCH_HOME"`" != "bin" ]; do
+if [[ -z "$OPENSEARCH_HOME" ]]; then
+  # determine OpenSearch home; to do this, we strip from the path until we find
+  # bin, and then strip bin (there is an assumption here that there is no nested
+  # directory under bin also named bin)
+  OPENSEARCH_HOME=`dirname "$SCRIPT"`
+
+  # now make OPENSEARCH_HOME absolute
+  OPENSEARCH_HOME=`cd "$OPENSEARCH_HOME"; pwd`
+
+  while [ "`basename "$OPENSEARCH_HOME"`" != "bin" ]; do
+    OPENSEARCH_HOME=`dirname "$OPENSEARCH_HOME"`
+  done
   OPENSEARCH_HOME=`dirname "$OPENSEARCH_HOME"`
-done
-OPENSEARCH_HOME=`dirname "$OPENSEARCH_HOME"`
+fi
 
 # now set the classpath
 OPENSEARCH_CLASSPATH="$OPENSEARCH_HOME/lib/*"