Bash - Weird white space error when printing variable - ruby-on-rails

Question

I am trying to create a private access token using the rails-terminal for GitLab using a bash script. I got the following script:
#!/bin/bash
password=$(microk8s kubectl exec -it gitlab-6f6ff575cb-zvcph -n project-utility -- /bin/sh -c 'gitlab-rails runner "puts SecureRandom.hex(4)"')
user_token=$(microk8s kubectl exec -it gitlab-6f6ff575cb-zvcph -n project-utility -- /bin/sh -c 'gitlab-rails runner "user = User.new(name: \"Project\", username: \"System\", email: \"system#project.com\", password: \"'"$password"'\"); user.save!; token = user.personal_access_tokens.create(name: \"System\", scopes: [:api]); puts token.token"')
echo "Generated password: $password"
echo "Generated user token: $user_token"
Now this script does everyting correctly except that there is a warning in the response of the user_token. The response is as folows:
Generated password: 9f9857cc
Generated user token: /opt/gitlab/embedded/lib/ruby/gems/2.7.0/gems/railties-6.1.6.1/lib/rails/commands/runner/runn in middle of line, treated as a mere space
glpat-VuHcqsoK8XkAMq1fhVTS
Now I have tried stripping the white-spaces using this:
user_token="${user_token##* }"
user_token="${user_token%% *}"
echo "Generated user token: $user_token"
This removes the warning, but prints a random space word in the output:
Generated password: 8465390c
Generated user token: space
glpat-Rzoz_Zn8xJ_9kVt1dVek
I also tried the following line to strip whitespaces:
user_token="$(echo "$user_token" | tr -d '[:space:]')"
echo "Generated user token: $user_token"
But this returns the warning again, but then without any spaces in the sentence...
The output I am trying to get is this ofcourse:
Generated password: 8465390c
Generated user token: glpat-Rzoz_Zn8xJ_9kVt1dVek
What am I doing wrong?

Answer 1

Your issue is the "${user_token##* }". This ignores the fact that a newline can be included in the output (which it is). So, you are only gobbling everything up until space<newline>glpat-.... To fix this, one option is to use cut:
user_token=$(cut -d $'\n' -f 2 <<< "$user_token")
user_token="${user_token%% *}"
echo "Generated user token: $user_token"
Of course, this assumes the filepath that's printed doesn't have any newlines, but I don't think that's a practical issue.
A better solution is to modify what you are already doing:
user_token="${user_token##*$'\n'}"
user_token="${user_token##* }"
user_token="${user_token%% *}"
echo "Generated user token: $user_token"