ruby - Check version of Python from Chef CookBook and install package according to the outcome -


i need write chef cookbook install packages according version of python installed in system.

is possible have following logic in chef recipe:

python_version = `python -v`    # check python version if python_version == '2.6.6'   package 'package_a'           # install package_a using chef package resource elsif python_version == '3.3.5'   package 'package_b'           # install package_b using chef package resource else   break                         # stop execution of cookbook end

thank in advance!

short answer yes.

you should use shell_out!('python -v').stdout().chomp() instead of backticks.

but information exist in node automatic attributes don't have call python -v:

ohai languages return:

{   "python": {     "version": "2.7.3",     "builddate": "jun 22 2015, 19:33:41"   },   "perl": {     "version": "5.14.2",     "archname": "x86_64-linux-gnu-thread-multi"   },   "c": {     "gcc": {       "version": "4.6.3",       "description": "gcc version 4.6.3 (ubuntu/linaro 4.6.3-1ubuntu5) "     }   } }

so should able write in recipe:

python_version = node['languages']['python']['version'] if python_version == '2.6.6'   package 'package_a'           # install package_a using chef package resource elsif python_version == '3.3.5'   package 'package_b'           # install package_b using chef package resource else   raise                         # stop execution of cookbook end

to stop chef run, need use raise the documentation


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