Improvements to `update_libseccomp2.sh` (#224)

tools/update_libseccomp2.sh

@@ -1,7 +1,24 @@
 #!/bin/bash
-echo "Libseccomp2 upgrade needed if you run rpi 32bit. Check version dpkg-query -W libseccomp, if the version 2.3 or blow, please run this script."
-cd ~
-wget http://ftp.us.debian.org/debian/pool/main/libs/libseccomp/libseccomp2_2.5.2-2_armhf.deb
-sudo dpkg -i libseccomp2_2.5.2-2_armhf.deb
+
+function error {
+  echo -e "\\e[91m$1\\e[39m"
+  exit 1
+}
+
+function check_internet() {
+  printf "Checking if you are online..."
+  wget -q --spider http://github.com
+  if [ $? -eq 0 ]; then
+    echo "Online. Continuing."
+  else
+    error "Offline. Go connect to the internet then run the script again."
+  fi
+}
+
+check_internet
+
+echo "Libseccomp2 upgrade needed if you run rpi 32bit. Check version with 'dpkg-query -W libseccomp'. if the version is 2.3 or below, this script is necessary."
+wget http://ftp.us.debian.org/debian/pool/main/libs/libseccomp/libseccomp2_2.5.2-2_armhf.deb || error "Failed to download libseccomp2.deb"
+sudo dpkg -i libseccomp2_2.5.2-2_armhf.deb || error "Failed to install libseccomp2.deb"
 rm -f libseccomp2_2.5.2-2_armhf.deb
 echo "Updating the libseccomp2 file is complete."