mkstage4.patch

--- mkstage4.sh.orig	2017-03-22 18:56:13.000000000 +0200
+++ mkstage4.sh	2019-09-14 15:47:52.929409445 +0300
@@ -7,6 +7,11 @@
   exit 1
 fi
 
+# checks if pbzip binary exist
+pbzip2=$(whereis pbzip2 | cut -d" " -f2)
+# if pbzip2 exist setting variable
+COMPRESSIONCOMMAND="--use-compress-program=pbzip2"
+
 #set flag variables to null
 EXCLUDE_BOOT=0
 EXCLUDE_CONNMAN=0
@@ -102,7 +107,7 @@
 
 # Excludes:
 EXCLUDES="\
---exclude=${TARGET}home/*/.bash_history \
+--exclude=${TARGET}home/* \
 --exclude=${TARGET}dev/* \
 --exclude=${TARGET}media/* \
 --exclude=${TARGET}mnt/*/* \
@@ -110,7 +115,8 @@
 --exclude=${TARGET}run/* \
 --exclude=${TARGET}sys/* \
 --exclude=${TARGET}tmp/* \
---exclude=${TARGET}usr/portage/* \
+--exclude=${TARGET}portage/* \
+--exclude=${TARGET}var/db/repos/* \
 --exclude=${TARGET}var/lock/* \
 --exclude=${TARGET}var/log/* \
 --exclude=${TARGET}var/run/*"
@@ -136,7 +142,12 @@
 fi
 
 # Generic tar options:
-TAR_OPTIONS="-cjpP --ignore-failed-read"
+
+if [ -f "$pbzip2" ]; then
+        echo "pbzip2 found on your system!" && TAR_OPTIONS="-cpP --use-compress-program=pbzip2 --ignore-failed-read"
+else
+    	echo "pbzip2 not found on your system, using bzip2 instead!" && TAR_OPTIONS="-cjpP --ignore-failed-read"
+fi
 
 # if not in quiet mode, this message will be displayed:
 if [ "$AGREE" != "yes" ]
@@ -158,9 +169,10 @@
 fi
 
 # start stage4 creation:
-if [ "$AGREE" == "yes" ]
+if [ "$AGREE" == "yes" ] && [ -f "$pbzip2" ]
 then
-  tar $TAR_OPTIONS $EXCLUDES $OPTIONS -f $STAGE4_FILENAME ${TARGET}*
+  echo "Starting stage4 compression process with parallel bzip!" && tar $TAR_OPTIONS $EXCLUDES $OPTIONS -f $STAGE4_FILENAME ${TARGET}*
+else
+  echo "Starting stage4 compression process with bzip!" && tar $TAR_OPTIONS $EXCLUDES $OPTIONS -f $STAGE4_FILENAME ${TARGET}*
 fi
-
 exit 0