Do not change user's profile with Nix installation

Signed-off-by: Pedro Pombeiro <pombeirp@users.noreply.github.com>

scripts/lib/setup/installers.sh

@@ -12,22 +12,12 @@ function download_url() {
 
 function install_nix() {
   if ! program_exists nix; then
-    touch -a "${HOME}/.bash_profile"
-
     local required_version=$(toolversion nix)
-    bash <(curl https://nixos.org/releases/nix/nix-${required_version}/install) --no-daemon
-    if [ $? -eq 0 ]; then
-      if is_linux && [ -f ~/.bashrc ] && ! grep -qF ".nix-profile/etc/profile.d/nix.sh" ~/.bashrc; then
-        # For some reason, new terminals are not started as login shells, so .profile and .bash_profile are not sourced.
-        # To get around it, we add Nix initialization to .bashrc as well, if it exists
-        echo "if [ -e ${HOME}/.nix-profile/etc/profile.d/nix.sh ]; then . ${HOME}/.nix-profile/etc/profile.d/nix.sh; fi # added by Status' setup script" >> ~/.bashrc
-      fi
-
+    NIX_INSTALLER_NO_MODIFY_PROFILE=1 bash <(curl https://nixos.org/releases/nix/nix-${required_version}/install) --no-daemon
     if [ $? -eq 0 ]; then
       echo -e "${YELLOW}**********************************************************************************************************"
       echo "The Nix package manager was successfully installed."
       echo -e "**********************************************************************************************************${NC}"
-      fi
     else
       echo "Please see https://nixos.org/nix/manual/#chap-installation"
     fi

scripts/setup

@@ -20,18 +20,6 @@ exit_unless_os_supported
 ####
 setup_header "Checking prerequisites..."
 
-if program_exists nix; then
-  if [ -z "$IN_NIX_SHELL" ]; then
-    if is_nixos; then
-      cecho "@b@yellow[[All's good, you can run 'make shell' now]]"
-      exit 0
-    else
-      cecho "@b@red[[Please run 'make shell' first]]"
-      exit 1
-    fi
-  fi
-fi
-
 if ! program_exists "curl"; then
   cecho "@b@yellow[[Please install curl before running setup.]]"
   exit 1