Improved handling of subdirectories in the xtrabackup-v2 SST scripts (similar...

Improved handling of subdirectories in the xtrabackup-v2 SST scripts (similar to MDEV-18863) for more predictable test results (related to xtrabackup-v2 SST)

scripts/wsrep_sst_mariabackup.sh

@@ -834,7 +834,7 @@ then
               -z $(parse_cnf --mysqld tmpdir "") && \
               -z $(parse_cnf xtrabackup tmpdir "") ]]; then
             xtmpdir=$(mktemp -d)
-            tmpopts=" --tmpdir=$xtmpdir "
+            tmpopts=" --tmpdir=$xtmpdir"
             wsrep_log_info "Using $xtmpdir as xtrabackup temporary directory"
         fi
 
@@ -1049,7 +1049,7 @@ then
 
         tempdir=$LOG_BIN_ARG
         if [ -z "$tempdir" ]; then
-           tempdir=$(parse_cnf mysqld$WSREP_SST_OPT_SUFFIX_VALUE log-bin "")
+            tempdir=$(parse_cnf mysqld$WSREP_SST_OPT_SUFFIX_VALUE log-bin "")
         fi
         if [ -z "$tempdir" ]; then
             tempdir=$(parse_cnf --mysqld log-bin "")

scripts/wsrep_sst_xtrabackup-v2.sh

@@ -906,7 +906,10 @@ if [ ! -z "$INNODB_DATA_HOME_DIR_ARG" ]; then
 fi
 # if INNODB_DATA_HOME_DIR env. variable is not set, try to get it from my.cnf
 if [ -z "$INNODB_DATA_HOME_DIR" ]; then
-    INNODB_DATA_HOME_DIR=$(parse_cnf --mysqld innodb-data-home-dir "")
+    INNODB_DATA_HOME_DIR=$(parse_cnf mysqld$WSREP_SST_OPT_SUFFIX_VALUE innodb-data-home-dir '')
+fi
+if [ -z "$INNODB_DATA_HOME_DIR" ]; then
+    INNODB_DATA_HOME_DIR=$(parse_cnf --mysqld innodb-data-home-dir '')
 fi
 if [ ! -z "$INNODB_DATA_HOME_DIR" ]; then
    INNOEXTRA+=" --innodb-data-home-dir=$INNODB_DATA_HOME_DIR"
@@ -937,9 +940,11 @@ then
             exit 93
         fi
 
-        if [[ -z $(parse_cnf --mysqld tmpdir "") && -z $(parse_cnf xtrabackup tmpdir "") ]];then 
+        if [[ -z $(parse_cnf mysqld$WSREP_SST_OPT_SUFFIX_VALUE tmpdir "") && \
+              -z $(parse_cnf --mysqld tmpdir "") && \
+              -z $(parse_cnf xtrabackup tmpdir "") ]]; then
             xtmpdir=$(mktemp -d)
-            tmpopts=" --tmpdir=$xtmpdir "
+            tmpopts=" --tmpdir=$xtmpdir"
             wsrep_log_info "Using $xtmpdir as xtrabackup temporary directory"
         fi
 
@@ -1057,8 +1062,24 @@ then
     [[ -n $SST_PROGRESS_FILE ]] && touch $SST_PROGRESS_FILE
 
     ib_home_dir=$INNODB_DATA_HOME_DIR
-    ib_log_dir=$(parse_cnf --mysqld innodb-log-group-home-dir "")
-    ib_undo_dir=$(parse_cnf --mysqld innodb-undo-directory "")
+
+    # Try to set ib_log_dir from the command line:
+    ib_log_dir=$INNODB_LOG_GROUP_HOME_ARG
+    if [ -z "$ib_log_dir" ]; then
+        ib_log_dir=$(parse_cnf mysqld$WSREP_SST_OPT_SUFFIX_VALUE innodb-log-group-home-dir "")
+    fi
+    if [ -z "$ib_log_dir" ]; then
+        ib_log_dir=$(parse_cnf --mysqld innodb-log-group-home-dir "")
+    fi
+
+    # Try to set ib_undo_dir from the command line:
+    ib_undo_dir=$INNODB_UNDO_DIR_ARG
+    if [ -z "$ib_undo_dir" ]; then
+        ib_undo_dir=$(parse_cnf mysqld$WSREP_SST_OPT_SUFFIX_VALUE innodb-undo-directory "")
+    fi
+    if [ -z "$ib_undo_dir" ]; then
+        ib_undo_dir=$(parse_cnf --mysqld innodb-undo-directory "")
+    fi
 
     stagemsg="Joiner-Recv"
 
@@ -1124,7 +1145,13 @@ then
             find $ib_home_dir $ib_log_dir $ib_undo_dir $DATA -mindepth 1 -prune -regex $cpat -o -exec rm -rfv {} 1>&2 \+
         fi
 
-        tempdir=$(parse_cnf --mysqld log-bin "")
+        tempdir=$LOG_BIN_ARG
+        if [ -z "$tempdir" ]; then
+            tempdir=$(parse_cnf mysqld$WSREP_SST_OPT_SUFFIX_VALUE log-bin "")
+        fi
+        if [ -z "$tempdir" ]; then
+            tempdir=$(parse_cnf --mysqld log-bin "")
+        fi
         if [[ -n ${tempdir:-} ]];then
             binlog_dir=$(dirname $tempdir)
             binlog_file=$(basename $tempdir)