fix buildpath, add swapfile and improve readme

Vagrantfile

@@ -90,6 +90,13 @@ Vagrant.configure("2") do |config|
     cat /home/vagrant/.ssh/id_rsa.pub >> /home/vagrant/.ssh/authorized_keys
     cat /home/vagrant/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys
 
+    echo -e "\n-- Allocating a swap file for cmake builds"
+    fallocate -l 3G /swapfile
+    chmod 600 /swapfile
+    mkswap /swapfile
+    swapon /swapfile
+    echo '/swapfile none swap sw 0 0' | tee -a /etc/fstab
+
     echo -e "\n-- Add a package for cmake"
     wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | sudo apt-key add -
     sudo apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main'
@@ -122,6 +129,7 @@ Vagrant.configure("2") do |config|
     ninja install
 
     echo -e "\n-- Installing googletest --\n"
+    cd /usr/src
     apt install -y libgtest-dev valgrind
     wget https://github.com/google/googletest/archive/release-1.7.0.tar.gz
     tar xf release-1.7.0.tar.gz

readme.md

@@ -35,6 +35,13 @@ apt-add-repository 'deb https://apt.kitware.com/ubuntu/ bionic main'
 apt update
 apt -y install cmake libboost-all-dev libleveldb-dev
 
+# in case ninja build fails with cannot allocate memory we have to create a swap file:
+fallocate -l 3G /swapfile
+chmod 600 /swapfile
+mkswap /swapfile
+swapon /swapfile
+echo '/swapfile none swap sw 0 0' | tee -a /etc/fstab
+
 # we are building cpprestsdk from a source code
 apt install -y git libssl-dev ninja-build
 cd /usr/src
@@ -49,6 +56,7 @@ ninja
 ninja install
 
 # clone this repo with the source code
+cd /usr/src
 git clone https://github.com/recipe/bambooslacking.git
 # compile application
 cd bambooslacking/build/release