fix path handling

.evergreen/github_app/create_or_modify_comment.sh

@@ -2,19 +2,19 @@
 set -o errexit # Exit the script with error if any of the commands fail
 set -x
 
-DIR=$(dirname $0)
+DIR="$(dirname "${BASH_SOURCE[0]}")"
 pushd $DIR
 
 # Bootstrap the secrets.
 bash $DIR/../auth_aws/setup_secrets.sh drivers/comment-bot
 source secrets-export.sh
 
 # Install node and activate it.
-set -x
 bash $DIR/../install-node.sh
 source $DIR/../init-node-and-npm-env.sh
 
 # Install and run the app.
+set -x
 npm install
 node create_or_modify_comment.mjs "$@"
 popd

.evergreen/init-node-and-npm-env.sh

@@ -7,7 +7,7 @@
 ## access to `npm`, `node`, or need to install something globally from
 ## npm.
 
-DIR=$(dirname $0)
+DIR="$(dirname "${BASH_SOURCE[0]}")"
 NODE_ARTIFACTS_PATH="$DIR/node-artifacts"
 if [[ "$OS" == "Windows_NT" ]]; then
  NODE_ARTIFACTS_PATH=$(cygpath --unix "$NODE_ARTIFACTS_PATH")

.evergreen/install-node.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit # Exit the script with error if any of the commands fail
 
-DIR=$(dirname $0)
+DIR="$(dirname "${BASH_SOURCE[0]}")"
 pushd $DIR
 
 NODE_LTS_VERSION=${NODE_LTS_VERSION:-18}