AttributeError: 'module' object has no attribute 'githash' (SOLVED)

With major changes involving using Astropy package template (see #313), I just want to document this for those who encounter this error in the future when attempting to install Ginga from source and already has an existing installation from the pre-PR313 days:

Traceback (most recent call last):
  File "setup.py", line 63, in <module>
    get_debug_option(PACKAGENAME))
  File ".../ginga/astropy_helpers/astropy_helpers/version_helpers.py", line 236, in generate_version_py
    last_githash = version_module.githash
AttributeError: 'module' object has no attribute 'githash'

SOLUTION

1. Find out where you install Ginga. Let’s call it install_dir. For example, blahblah/python2.7/site-packages/.
2. Remove Ginga installation from install_dir manually. For example, rm -r blahblah/python2.7/site-packages/ginga* (use with care).
3. Just to be safe, clean your source directory. For example, git clean -xdf (be careful of any new untracked files you wish to keep).
4. Now, you can install Ginga as usual. For example, python setup.py install.

[rirze]

Thanks for keeping this open, helped me out when I ran into this error.

[ejeschke]

Actually, @pllim, I’m wondering if we shouldn’t leave this open for a little while. I encountered this several times installing after merging #313. At the very least, it may prevent some filing of duplicate issues.