chore(install): no more deps for awk and ps for postinstall script

oam/install_scripts/columnstore-post-install.in

@@ -5,11 +5,76 @@
 # Post-install steps for columnstore install
 
 running_systemd() {
-   if  [ "$(ps --no-headers -o comm 1)" = "systemd" ]; then
+    # Check if init process (PID 1) is systemd by reading /proc/1/comm
+    if [ -r "/proc/1/comm" ]; then
+        if [ "$(cat /proc/1/comm)" = "systemd" ]; then
             echo 0
-   else
-       echo 1
+            return 0
         fi
+    fi
+
+    # Alternative check using /proc/1/exe symlink
+    if [ -L "/proc/1/exe" ]; then
+        local exe_target
+        exe_target=$(readlink -f "/proc/1/exe")
+        if [[ "${exe_target##*/}" == "systemd" ]]; then
+            echo 0
+            return 0
+        fi
+    fi
+
+    # Fallback check for systemd presence in /run/systemd
+    if [ -d "/run/systemd/system" ]; then
+        echo 0
+        return 0
+    fi
+
+    echo 1
+    return 1
+}
+
+get_parent_pid() {
+    local pid=$1
+    local ppid
+
+    # Read the stat file for the given PID
+    if [ -f "/proc/$pid/stat" ]; then
+        # Read the entire stat file into a variable
+        read -r stat <"/proc/$pid/stat"
+
+        # Split into array (parent PID is the 4th field)
+        IFS=' ' read -ra stat_array <<<"$stat"
+
+        # The PPID is the 4th element (0-based index 3)
+        ppid=${stat_array[3]}
+
+        echo "$ppid"
+        return 0
+    else
+        echo "Error: Process $pid does not exist" >&2
+        return 1
+    fi
+}
+
+get_env_var_value() {
+    local pid=$1
+    local var_name=$2
+    local env_file="/proc/$pid/environ"
+
+    if [ ! -r "$env_file" ]; then
+        echo "Error: Cannot read $env_file" >&2
+        return 1
+    fi
+
+    # Read null-delimited environ file and process each line
+    while IFS= read -r -d '' line; do
+        if [[ "$line" == "${var_name}="* ]]; then
+            echo "${line#*=}"
+            return 0
+        fi
+    done <"$env_file"
+
+    return 1
 }
 
 # This function recursively(up to PID 1) searches for
@@ -19,13 +84,12 @@ find_env_var() {
     pid=$$
     ENV_VAR=''
     while [ -z "$ENV_VAR" -a "$pid" != 1 ]; do
-        ppid=$(ps -oppid -p$pid|tail -1|awk '{print $1}')
+        ppid=$(get_parent_pid $pid)
         # This condition is true in containers
         if [ "$ppid" == 0 ]; then
-            break;
+            break
         fi
-        env=$(strings /proc/$ppid/environ)
-        ENV_VAR=$(echo "$env"|awk -F= "\$1 == \"$env_var_name\" { print \$2; }")
+        ENV_VAR=$(get_env_var_value $ppid $env_var_name)
         pid=$ppid
     done
     echo $ENV_VAR
@@ -40,12 +104,12 @@ fi
 checkForError() {
     # check for password error
     grep "ERROR 1045" ${installLogDir}/mysql_install.log >${installLogDir}/error.check
-	if [ `cat ${installLogDir}/error.check | wc -c` -ne 0 ]; then
+    if [ $(cat ${installLogDir}/error.check | wc -c) -ne 0 ]; then
         echo "There were authentication issues running install_mcs_mysql.sh \
 script. The log is available in ${installLogDir}/mysql_install.log. Please re-run \
 columnstore-post-install manually after solving the authentication issues."
         rm -f ${installLogDir}/error.check
-		  return 2;
+        return 2
     fi
 
     rm -f ${installLogDir}/error.check
@@ -66,11 +130,11 @@ columnstore-post-install manually after solving the authentication issues."
 
     echo "columnstore exists"
 
-	return 0;
+    return 0
 }
 
 rpmmode=install
-user=`whoami 2>/dev/null`
+user=$(whoami 2>/dev/null)
 
 quiet=0
 
@@ -112,7 +176,6 @@ if [ $? -ne 0 ] ; then
     exit 1
 fi
 
-
 profileFile="/etc/profile.d/columnstoreAlias.sh"
 /bin/cp -f @ENGINE_SUPPORTDIR@/columnstoreAlias /etc/profile.d/columnstoreAlias.sh
 chmod 644 /etc/profile.d/columnstoreAlias.sh >/dev/null 2>&1
@@ -147,8 +210,8 @@ rm -f @ENGINE_LOGDIR@/data/bulk/tmpjob/* >/dev/null 2>&1
 chmod -R 777 @ENGINE_LOGDIR@/data
 
 #get columnstore temp file directory name
-tmpDir=`@ENGINE_BINDIR@/mcsGetConfig SystemConfig SystemTempFileDir`
-scratchDir=$tmpDir`@ENGINE_BINDIR@/mcsGetConfig SystemConfig hdfsRdwrScratch`
+tmpDir=$(@ENGINE_BINDIR@/mcsGetConfig SystemConfig SystemTempFileDir)
+scratchDir=$tmpDir$(@ENGINE_BINDIR@/mcsGetConfig SystemConfig hdfsRdwrScratch)
 mkdir $tmpDir >/dev/null 2>&1
 mkdir $scratchDir >/dev/null 2>&1
 chmod 777 $tmpDir
@@ -162,7 +225,7 @@ if [ $user = "root" ]; then
     rm -f /etc/init.d/columnstore >/dev/null 2>&1
     rm -f /etc/default/columnstore
 
-    systemctl=`which systemctl 2>/dev/null`
+    systemctl=$(which systemctl 2>/dev/null)
     if [ -n "$systemctl" ]; then
         # Removing a separate ExeMgr unit.
         if [[ -f /usr/lib/systemd/system/mcs-exemgr.service ]]; then
@@ -199,7 +262,7 @@ if [ $user = "root" ]; then
         systemctl enable mcs-loadbrm >/dev/null 2>&1
         systemctl enable mcs-storagemanager >/dev/null 2>&1
     else
-        chkconfig=`which chkconfig 2>/dev/null`
+        chkconfig=$(which chkconfig 2>/dev/null)
         if [ -n "$chkconfig" ]; then
 
             cp @ENGINE_SBINDIR@/columnstore /etc/init.d/. >/dev/null 2>&1
@@ -207,7 +270,7 @@ if [ $user = "root" ]; then
             chkconfig columnstore on >/dev/null 2>&1
         else
             cp @ENGINE_SBINDIR@/columnstore /etc/init.d/. >/dev/null 2>&1
-            updaterc=`which update-rc.d 2>/dev/null`
+            updaterc=$(which update-rc.d 2>/dev/null)
             if [ -n "$updaterc" ]; then
 
                 update-rc.d columnstore defaults 99 >/dev/null 2>&1
@@ -375,7 +438,7 @@ fi
 if [ $(running_systemd) -eq 0 ]; then
     chown -R @DEFAULT_USER@:@DEFAULT_GROUP@ @ENGINE_LOGDIR@
     chown -R @DEFAULT_USER@:@DEFAULT_GROUP@ /etc/columnstore
-    findcmd=`which find 2>/dev/null`
+    findcmd=$(which find 2>/dev/null)
     if [ -n "$findcmd" ]; then
         if [[ $($findcmd @ENGINE_DATADIR@ -maxdepth 3 ! -user @DEFAULT_USER@ -exec echo {} \; -quit 2>/dev/null) ]]; then
             echo "At least one file is not owned by @DEFAULT_USER@ in @ENGINE_DATADIR@. Running chown..."