Improve QMAKE variable. Refactor VER. Enclose variables

scripts/linux/release.sh

@@ -3,35 +3,35 @@
 set -e
 
 TARGET_DIR=/tmp/sqls-installer
-QMAKE=/opt/qt/5.10.0/gcc_64/bin/qmake
+QMAKE=$(which qmake)
 CORES=2
 TMP_DIR=~/tmp/SQLiteStudio
 
-if [ ! -f $QMAKE ]; then
+if [ ! -f "$QMAKE" ]; then
     echo "qmake at $QMAKE does not exist."
     exit 1
 fi
 
-OLDDIR=`pwd`
+OLDDIR=$(pwd)
 
-VER=`grep 'static const int sqlitestudioVersion' ../../SQLiteStudio3/coreSQLiteStudio/sqlitestudio.cpp | egrep -o '[\ 0-9]{2}' | bc | paste -s -d'.'`
+VER=$(grep 'static const int sqlitestudioVersion' ../../SQLiteStudio3/coreSQLiteStudio/sqlitestudio.cpp | grep -E -o '[\ 0-9]{2}' | bc | paste -s -d'.')
 
 rm -rf ../../output
-./compile.sh $QMAKE $CORES
-./create_portable.sh $QMAKE
+./compile.sh "$QMAKE" $CORES
+./create_portable.sh "$QMAKE"
 cd ../installer
 rm -rf $TARGET_DIR
 tclsh assemble.tcl $TARGET_DIR --repo
 
 rm -rf $TMP_DIR
-$TARGET_DIR/InstallSQLiteStudio-* TargetDir=$TMP_DIR
+"$TARGET_DIR"/InstallSQLiteStudio-* TargetDir=$TMP_DIR
 
 mv $TMP_DIR $TARGET_DIR/
 cd $TARGET_DIR
 
-tar cf sqlitestudio-$VER.tar SQLiteStudio
-xz -z sqlitestudio-$VER.tar
+tar cf "sqlitestudio-$VER.tar" SQLiteStudio
+xz -z "sqlitestudio-$VER.tar"
 rm -rf SQLiteStudio
 echo "Deleted installed app. System is clean."
 
-cd $OLDDIR
+cd "$OLDDIR" || exit 1