Creating parameterized GitLab personal access token from CLI - docker

Question

Based on this example:
sudo gitlab-rails runner "token = User.find_by_username('automation-bot').personal_access_tokens.create(scopes: [:read_user, :read_repository], name: 'Automation token'); token.set_token('token-string-here123'); token.save!"
I've created an equivalent working command for docker that creates the personalised access token from the CLI:
output="$(sudo docker exec -i 5303124d7b87 bash -c "gitlab-rails runner \"token = User.find_by_username('root').personal_access_tokens.create(scopes: [:read_user, :read_repository], name: 'Automation token'); token.set_token('token-string-here123'); token.save! \"")"
However, when trying to parameterize that command, I am experiencing slight difficulties with the single quote. For example, when I try:
output="$(sudo docker exec -i 5303124d7b87 bash -c "gitlab-rails runner \"token = User.find_by_username($gitlab_username).personal_access_tokens.create(scopes: [:read_user, :read_repository], name: 'Automation-token'); token.set_token('token-string-here123'); token.save! \"")"
It returns:
undefined local variable or method `root' for main:Object
Hence, I would like to ask, how can I substitute 'root' with a variable $gitlab_username that has value root?

Answer 1

I believe the error was, unlike I had assumed incorrectly, not necessarily in the command, but mostly in the variables that I passed into the command. The username contained a newline character, which broke up the command. Hence, I included a trim function that removes the newline characters from the incoming variables. The following function successfully creates a personal access token in GitLab:
create_gitlab_personal_access_token() {
docker_container_id=$(get_docker_container_id_of_gitlab_server)
# trim newlines
personal_access_token=$(echo $GITLAB_PERSONAL_ACCESS_TOKEN | tr -d '\r')
gitlab_username=$(echo $gitlab_server_account | tr -d '\r')
token_name=$(echo $GITLAB_PERSONAL_ACCESS_TOKEN_NAME | tr -d '\r')
# Create a personal access token
output="$(sudo docker exec -i $docker_container_id bash -c "gitlab-rails runner \"token = User.find_by_username('$gitlab_username').personal_access_tokens.create(scopes: [:read_user, :read_repository], name: '$token_name'); token.set_token('$personal_access_token'); token.save! \"")"
}