Add distro support for Fedora 20

[brianredbeard]

environment.py lacks the proper path to discover Arduino's version.txt file.

[brianredbeard]

output when you attempt to run:

[bharrington@ushi-oni-acor-to lirasp]$ rpm -ql arduino-core | grep -i version
/usr/share/arduino/lib/version.txt
[bharrington@ushi-oni-acor-to lirasp]$ ino build
Traceback (most recent call last):
  File "/usr/bin/ino", line 6, in <module>
    main()
  File "/usr/lib/python2.7/site-packages/ino/runner.py", line 76, in main
    args.func(args)
  File "/usr/lib/python2.7/site-packages/ino/commands/build.py", line 282, in run
    self.setup_flags(args)
  File "/usr/lib/python2.7/site-packages/ino/commands/build.py", line 154, in setup_flags
    '-DARDUINO=' + str(self.e.arduino_lib_version.as_int()),
  File "/usr/lib/python2.7/site-packages/ino/environment.py", line 62, in as_int
    return self.major * 100 + self.minor * 10 + self.build
IndexError: tuple index out of range

[brianredbeard]

Strike that, more debugging shows that the first two fields are being parsed.

[hroncok]

Just got the very same traceback. What's wrong?

[charlesbrandt]

I ran into this too. In ino/environment.py there is a property arduino_lib_version that is supposed to initialize an attribute of the same name. When it checks if it exists already, it finds the property name and never initializes the attribute. Here's an updated version that seems to fix it for me:

@property
def arduino_lib_version(self):
    self.find_arduino_file('version.txt', ['lib'],
                           human_name='Arduino lib version file (version.txt)')

    if '_arduino_lib_version' not in self:
        with open(self['version.txt']) as f:
            print 'Detecting Arduino software version ... ',
            v_string = f.read().strip()
            v = Version.parse(v_string)
            self['_arduino_lib_version'] = v
            print colorize("%s (%s)" % (v, v_string), 'green')

    return self['_arduino_lib_version']

I made a pull request here:
#195

[charlesbrandt]

After further investigation, this may have been due to an old .build directory from an older version of ino. If you see the error, try deleting .build directory first and see if that fixes it. Please let me know if so.