sass failed when generate bundles from CLI

[Slach]

i have flask application with buildout in src folder

./bin/pip show flask | grep Version

Version: 0.10.1

./bin/pip show flask-assets | grep Version

Version: 0.10

src/setup.py have following strings

setup(
    name = 'spf',
    install_requires = [
        'flask',
        'flask-assets',
    ],
    entry_points = {
        'console_scripts': [
            'spf_dev = spf.manage:dev', /* see manage.py dev function */
        ],
    },
}

src/spf/manage.py

from flask.ext import assets
from . import env

def init (app):
    manager = script.Manager(app)

    manager.add_command(
        'assets',
        assets.ManageAssets(app.assets),
    )
    return manager

def dev ():
    init(env.dev.app).run()

src/spf/env/dev.py

from spf import init
app = init({
    'ASSETS_DIR': 'src/spf/static/assets',
    'ASSETS_URL': '/assets/',

    'SASS_STYLE': 'compressed',

    'UGLIFYJS_EXTRA_ARGS': (
        '-c',
        '--screw-ie8',
    ),

})

src/spf/init.py

import flask
from . import assets

def init (env_config=None):
    app = flask.Flask(
        'spf',
        static_url_path='',
    )

    app.config.update(evn_config)
    app.assets = assets.Assets(app)
    return app

src/spf/assets.py

from flask.ext.assets import (
    Environment,
    Bundle,
)

class Assets (Environment):
    def __init__ (self, app):
        super(Assets, self).__init__(app)

        if 'ASSETS_DIR' in app.config:
            self.directory = app.config['ASSETS_DIR']

        if 'ASSETS_URL' in app.config:
            self.url = app.config['ASSETS_URL']

        if 'SASS_STYLE' in app.config:
            self.config['sass_style'] =  app.config['SASS_STYLE']

        if 'UGLIFYJS_EXTRA_ARGS' in app.config:
            self.config['UGLIFYJS_EXTRA_ARGS'] = \
                app.config['UGLIFYJS_EXTRA_ARGS']

        self.register('theme.css', Bundle(
            'scss/theme.scss',
            filters='scss',
            output='theme.css',
        ))

        self.append_path('src/assets')

src/assets/scss/theme.scss

@import 'btn-o';

src/assets/scss/_btn-o.scss exists and have 0777 access right

but when i run
./bin/spf_dev assets -v build

i have error

Building bundle: theme.css
Failed, error was: sass: subprocess had error: stderr=Error: File to import not found or unreadable: ./btn-o. on line 1 of standard input
  Use --trace for backtrace. , stdout=, returncode=65

i have read https://github.com/miracle2k/webassets/blob/master/src/webassets/filter/sass.py#L36

but i don't understand
why sass don't use src/assets for resolve relative path in @import directive from stdin?

self.append_path('src/assets')

[miracle2k]

The comment you linked to shouldn't apply to your case, since you do not configure the sass filter as an "output filter".

I don't see anything obvious wrong.

Look here: https://github.com/miracle2k/webassets/blob/master/src/webassets/filter/sass.py#L163

At this point the working directory should be set to src/assets/scss/. I would then expect sass to find the include file in the same directory as the theme.scss file itself. Maybe by calling the command being executed at this point manually, you can figure out why not.

[Slach]

After rollback to old version 3.4.13 of sass , everything work fine...
see
sass/sass#1745