Hi Brad, > The yaml issue was solved by creating a script that installs python3-yaml and other required packages before calling our python install hook. I can provide an example if you want.
It's pretty straightforward to call apt install on python-yaml or python3-yaml, but I please do share the script -- I'd appreciate knowing what else might be missing :-) Thank you, ~ PeteVG On Fri, Jul 1, 2016 at 11:23 AM Brad Crittenden <[email protected]> wrote: > > > On Jul 1, 2016, at 11:15 , Pete Vander Giessen < > [email protected]> wrote: > > > > Hi All, > > > > I ran into an issue making a version of the mariadb charm for Xenial, > and wanted to know if others had run into it, and whether we had any best > practices or workarounds. > > > > Mariadb is a non layered charm that uses hooks written in Python. Two of > the hooks -- "install' and "config-changed", specifically -- import > charmhelpers. Both of those hooks fail on an import error on Xenial, when > charmhelpers attempts to import yaml. > > > > Pyaml isn't part of the Python standard library, but it looks like it is > installed by default in the default Python distribution on any given series > of Ubuntu. On Xenial, this means that yaml is automatically available to > Python 3, but not to Python 2, which is what the scripts were using. > > > > The solution is either to a) port the install and config-changed hooks > to python3, which is what I did while rushing to meet a deadline yesterday, > or b) to install yaml in Python 2, which is the simpler solution that seems > obvious this morning, after I am no longer worried about deadlines :-) > (Note that solution "a" breaks the charm in trusty, as Python 3 is not the > default version of Python for Trusty, and does not have yaml installed by > default in that series.) > > > > I wanted to ping the list to see if anybody had run into similar > problems porting charms to Xenial, however. Should I open a ticket against > charmhelpers to add pyaml as a dependency? Are there other, better > workarounds? > > We have run into this problem. Our solution was to make the charms work > with Python3 on trusty and xenial. The yaml issue was solved by creating a > script that installs python3-yaml and other required packages before > calling our python install hook. I can provide an example if you want. > > —Brad > > >
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