[chef] Re: Re: Re: Re: How would I prevent python_pip from installing packages that are already installed?

[Fabien Delpierre < >]

Success! Initially I had some trouble because I need to remove a few lines from my pip requirements file before passing it to Chef, and after running that .split, my code that did that no longer worked, so I struggled with that for a bit, then it occurred to me that I could just clean up the requirements file before splitting the package from the package version, and now I have working code, and Chef runs after the first one now take 50-60 seconds. Seems like I don't even need that not_if anymore, either. So here's my updated code if anyone cares. It's probably not very elegant but it's the best this newbie programmer can come up with, and it works.

# Install packages not loaded from the requirements file

node['foo']['venv_packages'].each do |pkg, pkg_version|

  python_pip pkg do

    virtualenv node['foo']['venv']

    version pkg_version

    action :install

  end

end

# Parse the pip requirements file and remove pyodbc, we'll deal with it separately

reqs = IO.readlines("/foo/setup/dev-requirements.txt").map {|r| r.chomp}

pyodbc = []

while reqs.index{|r| r.include?("pyodbc")} != nil

  match = reqs.index{|r| r.include?("pyodbc")}

  pyodbc.push(reqs[match])

  reqs.delete_at(match)

end

# Now re-parse the array to split the package names from the desired versions

reqs = reqs.map {|r| r.strip.split('==')}

# Install the packages we want in the virtual environment

reqs.each do |pkg, pkg_version|

  python_pip pkg do

    virtualenv node['foo']['venv']

    version pkg_version

    action :install

  end

end

# Now install pyodbc

match = pyodbc.index{|p| p.include?("pyodbc=")}

pyodbc_pkg = pyodbc[match].split("==") # this should now be = ["pyodbc","3.0.7"]

pyodbc.delete_at(match)

pyodbc_args = pyodbc * " " # this should now be = "--allow-external pyodbc --allow-public pyodbc"

python_pip pyodbc_pkg[0] do

  virtualenv node['foo']['venv']

  version pyodbc_pkg[1]

  options pyodbc_args

  action :install

end

On Fri, Mar 6, 2015 at 7:32 PM, Daniel DeLeo < " target="_blank"> > wrote:

On Friday, March 6, 2015 at 2:39 PM, Fabien Delpierre wrote:

> Daniel,
> Setting the version like:
> python_pip 'package' do
> version 'x'
> ...
> end
> ...sounds like something I should be able to figure out. I have a requirements file that looks like this:
> package==version
> And a long list of packages.

Ruby’s pretty good for quick and dirty scripting of this kind of thing. Something like this should work:

require ‘pp’ # just for debugging/showing the example

names_and_version_specs = IO.readlines('/tmp/example.txt')
names_and_versions = names_and_version_specs.map do |line|
  line.strip.split('==')
end

# debug
pp names_and_versions

# do something like this in your recipe:
# names_and_versions.each do |name, pkg_version|
# python_pip name do
# version pkg_version
# end
# end



HTH,

--
Daniel DeLeo