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POHeroku RPy RHOME discovery
 

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  1. POHeroku RPy RHOME discovery
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    <p>I am trying to run a multipack Heroku app that uses Python and R. I have the multi buildpack installing R first, but RPy's installation is not able to find R despite my modifications to $PATH. What is going on here? R sees RHOME as "/app/vendor/R/lib64/R" when init.r runs.</p> <pre><code>-----&gt; Fetching custom git buildpack... done -----&gt; Multipack app detected =====&gt; Downloading Buildpack: https://github.com/virtualstaticvoid/heroku-buildpack-r =====&gt; Detected Framework: R Vendoring R 2.15.1 Downloading and unpacking R binaries Executing init.r script [1] "/app/vendor/R/lib64/R" #This is me dumping out RHOME from init.r R 2.15.1 successfully installed =====&gt; Downloading Buildpack: https://github.com/heroku/heroku-buildpack-python =====&gt; Detected Framework: Python -----&gt; No runtime.txt provided; assuming python-2.7.4. -----&gt; Using Python runtime (python-2.7.4) -----&gt; Installing dependencies using Pip (1.3.1) Downloading/unpacking rpy2==2.3.5 (from -r requirements/base.txt (line 22)) Running setup.py egg_info for package rpy2 sh: R: not found Error: Tried to guess R's HOME but no R command in the PATH. Complete output from command python setup.py egg_info: running egg_info creating pip-egg-info/rpy2.egg-info writing pip-egg-info/rpy2.egg-info/PKG-INFO writing top-level names to pip-egg-info/rpy2.egg-info/top_level.txt writing dependency_links to pip-egg-info/rpy2.egg-info/dependency_links.txt writing manifest file 'pip-egg-info/rpy2.egg-info/SOURCES.txt' warning: manifest_maker: standard file '-c' not found sh: R: not found Error: Tried to guess R's HOME but no R command in the PATH. ---------------------------------------- Command python setup.py egg_info failed with error code 1 in /tmp/pip-build-u32629/rpy2 Storing complete log in /app/.pip/pip.log ! Heroku push rejected, failed to compile Multipack app To git@heroku.com:D.git ! [remote rejected] master -&gt; master (pre-receive hook declined) (venvddd)ben@Watt:~/Projects/D/D$ heroku config:get PATH /home/ben/Projects/D/venvddd/bin:/usr/local/heroku/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/app/vendor/R/lib64/R:/app/vendor/R/lib64/R/bin </code></pre>
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    1. COrpy2's `setup.py` is using `os.popen("R RHOME")`. May be "something" is happening when the child subprocess is created on Heroku. Since that function is deprecated in Python, it would be worth trying whether the `subprocess` module solves the problem.
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    2. COTurns out the issue is buildpack installation being transactional on heroku, so $PATH is changing between installations. Forking the heroku python buildpack and tweaking the $PATH variable makes installation run, but I am hitting newer and more interesting import errors later on. More as it develops.
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      1. USbwarren2
    3. COGot it done! This is much trickier than you might originally expect, with hacking in several custom buildpacks and configuration of environment variables to manage imports. The secret is that Heroku buildpacks are transactional, though.
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      1. POHeroku RPy RHOME discovery
      1. USbwarren2
 

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