I keep getting an error when I run a file called wc.rb. I type:
ruby wc.rb
but I keep getting this error:
/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require': cannot load such file -- nokogiri (LoadError)
from /usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:45:in `require'
from wc.rb:3:in `<main>'
However, it works when I run the same script with:
sudo ruby wc.rb
Is there anything I can do so that I don't have to run this script as a super user?
When you run with sudo are you running the same version of Ruby? If sudo ruby -v returns something different than ruby -v, you may have only installed the Nokogiri gem in the Ruby 2.0 gem location, and not for the gem location associated with your system's default version of Ruby.
Update: If you originally installed the Nokogiri gem using sudo, you also may need to uninstall it first using sudo (sudo gem uninstall nokogiri) and re-install it without using sudo (gem install nokogiri) for the permissions to be correct.
Related
I'm not a Ruby person, so this may be a 101 question. I'm just trying to use a utility that happens to be written in Ruby.
I'm using tilemaker, a utility in the openstreetmap ecosystem. It creates tiles in the mbtiles format. The repository comes with a simple utility to serve the tiles on a browser to test the files you create. This utility is written in Ruby, and is what I'm having trouble with.
The repo's README has instructions for the server utility. The installation instructions read:
(If you don't already have them, you'll need to install Ruby and the required gems to run the demonstration server. On Ubuntu, for example, sudo apt install sqlite3 libsqlite3-dev ruby ruby-dev and then sudo gem install sqlite3 cgi glug rack.)
I'm on Debian 11 (on Qubes, so I don't mind running sudo gem install as they recommend). I hope this is close enough to Ubuntu but maybe this is related to the problem.
This is what I get:
$ ruby server.rb ~/countries-raster.mbtiles
Starting local server
Traceback (most recent call last):
3: from server.rb:22:in `<main>'
2: from server.rb:118:in `<class:MapServer>'
1: from /usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb:85:in `require'
/usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb:85:in `require': cannot load such file -- rack/handler (LoadError)
What am I missing here? Thanks.
It appears that the issue is that you are using a 3.X release of rack.
According to the CHANGELOG as of version 3.0 Rack::Handler was removed from rack and pulled out into its own gem (rackup).
To resolve the issue you will need to either use an older version of rack
gem 'rack', '~> 2.2'
Or you will need to add the rackup gem as a dependency:
gem 'rack'
gem 'rackup'
Either option will provide access to rack/handler:
rack (2.2.5) - Source
rackup (0.2.3) - Source
for a better setup under your user, this could be done:
ensure to have ruby running under your user by:
ruby -v # 2.7 or higher is better
then create a file besides your script server.rb called Gemfile:
# Gemfile
source "https://rubygems.org"
gem "rack"
gem "sqlite3"
gem "cgi"
gem "glug"
After that, ensure to have bundler installed (this is a gem to manage gem versioning), by:
gem install bundler
If you face a permission error, is because your ruby program is under root user. So you can use via sudo bundle install, but anything else must be run under sudo, or you can install and setup rvm which will install and configure ruby under your user.
After installing you can call:
bundle install
# will install all the gems needed and will lock the latest versions for you inside Gemfile.lock
run your server by:
bundle exec ruby server.rb
by running via bundle exec your telling to ruby to use the gems installed and versioned by the Gemfile.lock. This guarantees to your software to require the specific versions and avoid collisions or anything else.
So, it seems like ruby isn't able to find gems that are installed? The error:
/Users/userName/.rbenv/versions/2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
`require': cannot load such file -- activesupport (LoadError)
from /Users/userName/.rbenv/versions/2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in
`require'
from test.rb:3:in `<main>'
I had ruby installed via RVM and brew on my Mac (El Capitan). I don't remember what I had done when I started getting this error when trying to run my ruby program. At the top of my program I have require 'json' and require 'rest-client', and require 'activesupport' Nothing abnormal there.
After a lot of googling, I ended up doing rvm implode and removing the .rvm files from my computer to completely uninstall rvm. I then tried installing ruby via brew, but was getting the same error. I then uninstalled the the brew version of ruby, and installed with rbenv. Still got the same error, but this time with the rbenv path to the kernal_require.rb file instead of the brew or rvm paths that it had showed before.
So something tells me that this is not something to do with rvm or brew or rbenv because I was getting the same error with the versions of ruby I tried for each one. The gems are installed. Why isn't it able to load them? Uninstalling and reinstalling the gems didn't help. I had to reinstall them anyway every time I uninstalled and reinstalled ruby.
gem env home returns this:
/Users/userName/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0
brew config returns this for ruby:
Ruby: /Users/userName/.rbenv/shims/ruby => /Users/userName/.rbenv/versions/2.3.0/bin/ruby
I have these included in my PATH:
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init -)"
ruby -v returns this:
ruby 2.3.0p0 (2015-12-25 revision 53290) [x86_64-darwin15]
I've checked for spaces in the file path, I've tried installing bundler and installing gems that way, but I'm still getting the same issue. What else can I look at to solve this problem?
You use
gem 'activerecord'
in the gemfile.
require 'active_support/all'
is used in the program.
It's slightly annoying when gems do this, but you can't always assume the files you require have the same name as in the Gemfile.
I'm using Postgres.app on OS X (10.8.3). I have modified my PATH so that the bin folder for the app is before all others.
Rammy:~ phrogz$ which pg_config
/Applications/Postgres.app/Contents/MacOS/bin/pg_config
I have rvm installed and can install the pg gem without error, but when I go to require it I get an error:
Rammy:~ phrogz$ gem -v
1.8.25
Rammy:~ phrogz$ gem install pg
Fetching: pg-0.15.1.gem (100%)
Building native extensions. This could take a while...
Successfully installed pg-0.15.1
1 gem installed
Rammy:~ phrogz$ ruby -v -e "require 'pg'"
ruby 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin12.3.0]
/Users/phrogz/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': dlopen(/Users/phrogz/.rvm/gems/ruby-1.9.3-p392/gems/pg-0.15.1/lib/pg_ext.bundle, 9): Library not loaded: #executable_path/../lib/libssl.1.0.0.dylib (LoadError)
Referenced from: /Applications/Postgres.app/Contents/MacOS/lib/libpq.dylib
Reason: image not found - /Users/phrogz/.rvm/gems/ruby-1.9.3-p392/gems/pg-0.15.1/lib/pg_ext.bundle
from /Users/phrogz/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /Users/phrogz/.rvm/gems/ruby-1.9.3-p392/gems/pg-0.15.1/lib/pg.rb:4:in `<top (required)>'
from /Users/phrogz/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in `require'
from /Users/phrogz/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in `rescue in require'
from /Users/phrogz/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
from -e:1:in `<main>'
What do I need to do to get the pg gem properly installed?
Edit: Even though this answer currently has more votes than the accepted answer, the accepted answer is far simpler and cleaner.
Remove the Postgres.app binaries from the path when installing the pg gem, and instead use the postgres install built into OS X to configure the gem. The pg library will still correctly connect to the Postgres.app server later on.
Rammy:~ phrogz$ gem uninstall pg
Successfully uninstalled pg-0.15.1
# Modify PATH to remove /Applications/Postgres.app/Contents/MacOS/bin
Rammy:~ phrogz$ gem install pg
Fetching: pg-0.15.1.gem (100%)
Building native extensions. This could take a while...
Successfully installed pg-0.15.1
1 gem installed
Rammy:~ phrogz$ ruby -v -e "require 'pg'"
ruby 1.9.3p392 (2013-02-22 revision 39386) [x86_64-darwin12.3.0]
I found a solution that works for me and requires minimal hacking/configuring. You only need to do this once and it will work for every bundle install. Add the following to your .bash_profile, .bash_rc, or equivalent:
export DYLD_FALLBACK_LIBRARY_PATH=/Applications/Postgres.app/Contents/MacOS/lib:$DYLD_LIBRARY_PATH
(Assuming you installed Postgres.app in the default location). Then restart your terminal session and try again.
Exporting to DYLD_LIBRARY_PATH directly can cause serious problems with other apps that depend on it, but using the fallback path avoids these problems.
See also:
https://github.com/PostgresApp/PostgresApp/issues/109#issuecomment-18387546
Postgres.app upgrade, now Rails app won't start
EDIT: It seems that setting DYLD_FALLBACK_LIBRARY_PATH causes an error when you try to run psql. To fix this, you can add the following two lines to your .bash_profile:
alias psql="(. ~/.bash_profile; unset DYLD_FALLBACK_LIBRARY_PATH; psql)";
This is assuming that you're using bash and that your .bash_profile is located in your home directory. If that's not the case (or if you're using a .bashrc or other environment setup instead of .bash_profile) change the ~/.bash_profile part of the command to the path to your environment setup script.
The aliased commands basically start a subshell which does not effect your current bash environment. So when it unsets the DYLD_FALLBACK_LIBRARY_PATH variable, it's only temporary. After you exit psql the environment variable will be set again so that rails functions properly.
This worked for me:
sudo env ARCHFLAGS="-arch x86_64" gem install pg -- --with-pg-config=/Applications/Postgres93.app/Contents/MacOS/bin/pg_config
Just double check that the /Applications/Postgres93.app.. path exists for you.
The problem is in the linking of the gem to the Postgres.app.
If you link it to the postgres version that ships with osx
Here's a small script:
if using rvm with project gemsets: change into your project
run the following commands:
gem uninstall pg
PATH=${PATH/'Postgres.app'/'WRONGFOLDER.app'}
gem install pg
PATH=${PATH/'WRONGFOLDER.app'/'Postgres.app'}
Now everthing should be fine
After going step by step (installed both ruby and rubygems properly) to install watir-webdriver, I am facing following error:
ERROR: Error installing watir-webdriver:
ERROR: Failed to build gem native extension.
/usr/bin/ruby1.9.1 extconf.rb
<internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- mkmf (LoadError)
from <internal:lib/rubygems/custom_require>:29:in `require'
from extconf.rb:4:in `<main>'
Please help me resolve this and do let me know what made this happened?
Not sure how you are installing ruby on your Ubuntu machine but may I recommend the Ruby Version Manager.
https://rvm.io/
this will allow you to install different versions of ruby on your machine and switch between them as well as gems etc.
here is a quick guide I wrote for installing watir webdriver in Ubuntu via RVM:
Ubuntu requires the use of a Ruby Version Manager. To do this we will need to first install both the Curl package and Git-core.
To do this use the following command:
sudo apt-get install curl git-core
Upon success we will need to download the Ruby Version Manager application. This application allows us to install multiple versions of ruby as well as switch between. It also provides a Gem manger. Recommended to Google to read up on the commands and features within RVM. To install RVM use the following:
bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer )
We can also install packages within RVM and we will require the use of openSSL:
rvm pkg install openssl
Then installing Ruby itself:
rvm install 1.9.3-p125 --with-openssl-dir=$rvm_path/usr
Best to test this is all working with:
irb
When all clear we can install the Gem, we need to install it within the RVM with the follow:
rvm do gem install watir-webdriver
If installed correctly we should be able to use watir to drive firefox which is already installed on ubuntu.
I am not Linux/Ubuntu expert but the error message says you do not have build tools installed.
Whenever I enter a gem command, such as
gem "tilt"
or
gem "mysql"
I get this error:
While executing gem ... <RuntimeError>
Unknown command tilt
When I run gem list, both tilt and mysql show up on the list, so they are installed. In fact, I get this error with every item on the list. What could be causing this?
gem isn't lying to you, they aren't valid gem commands.
Perhaps you're confusing the command line with Bundler? For example, adding
gem "tilt"
to a Gemfile and running bundle install will install tilt. But Bundler uses its own syntax, and isn't a shell script. To install tilt using the gem binary directly you'd have to do:
gem install tilt
Running gem help will give you a list of gem's command line arguments.
You're using the Gemfile syntax and you should be using the commandline syntax. Give this a try:
gem install mysql2 -v 0.2.7
Make sure your syntax is correct for more guidelines you can type
gem help
To see the acceptable syntax for ruby,
If you get this error "You don't have write permissions for the /Library"
You can always add sudo to elevate privileges.
eg. sudo gem install <gemname>
Using sudo before your code and that will give you administrative access (after you type your computer password).
After that you may have to run bundle install to install the gem.