Fix path issues in ubuntu_setup.sh and openpilot_env.sh (#21380)

* fix: fix pathing issues in ubuntu_setup.sh and openpilot_env.sh

Fixes:
- enter git tree before trying git operations in ubuntu_setup.sh
- extend PYTHONPATH instead of overwriting it in openpilot_env.sh
- fix pyenv pathing with workaround in openpilot_env.sh

This also adds a newline before .bashrc extensions to visually separate
the additions from existing content.

* Update tools/ubuntu_setup.sh

Co-authored-by: Adeeb Shihadeh <adeebshihadeh@gmail.com>
old-commit-hash: 6d3c587564

tools/openpilot_env.sh

@@ -1,9 +1,18 @@
 if [ -z "$OPENPILOT_ENV" ]; then
-  export PYTHONPATH="$HOME/openpilot"
+  export PYTHONPATH="$HOME/openpilot:$PYTHONPATH"
 
   unamestr=`uname`
   if [[ "$unamestr" == 'Linux' ]]; then
     export PATH="$HOME/.pyenv/bin:$PATH"
+
+    # Pyenv suggests we place the below two lines in .profile before we source
+    # .bashrc, but there is no simple way to guarantee we do this correctly
+    # programmatically across heterogeneous systems. For end-user convenience,
+    # we add the lines here as a workaround.
+    # https://github.com/pyenv/pyenv/issues/1906
+    export PYENV_ROOT="$HOME/.pyenv"
+    eval "$(pyenv init --path)"
+
     eval "$(pyenv virtualenv-init -)"
   elif [[ "$unamestr" == 'Darwin' ]]; then
     # msgq doesn't work on mac

tools/ubuntu_setup.sh

@@ -68,18 +68,17 @@ if ! command -v "pyenv" > /dev/null 2>&1; then
   curl -L https://github.com/pyenv/pyenv-installer/raw/master/bin/pyenv-installer | bash
 fi
 
-# install bashrc
+# in the openpilot repo
+cd $HOME/openpilot
+
 source ~/.bashrc
 if [ -z "$OPENPILOT_ENV" ]; then
   OP_DIR=$(git rev-parse --show-toplevel)
-  echo "source $OP_DIR/tools/openpilot_env.sh" >> ~/.bashrc
+  printf "\nsource %s/tools/openpilot_env.sh" "$OP_DIR" >> ~/.bashrc
   source ~/.bashrc
   echo "added openpilot_env to bashrc"
 fi
 
-# in the openpilot repo
-cd $HOME/openpilot
-
 # do the rest of the git checkout
 git lfs pull
 git submodule init