Cannot create a scene for OLCI data

[simonrp84]

Describe the bug
Using the latest satpy master, I cannot create a Scene when trying to load OLCI data. Instead, I get:
No filenames found for reader: olci_l1b

I thought this might be due to running on windows (hence \\ instead of /) in the OLCI file format names, but I tried changing the YAML file and it still doesn't work.

To Reproduce

from satpy import Scene, find_files_and_readers
from glob import glob

indir = "C:/Users/EUMETCAST#/Downloads/"
files = glob(indir + '*S3A*/*.nc')
print(len(files))
scn = Scene(files, reader='olci_l1b')

Expected behavior
A scene is created based on the OLCI files found via glob.

Actual results

Don't know how to open the following files: 
{'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\removed_pixels.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa16_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa12_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa02_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa13_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa01_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa04_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\qualityFlags.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\tie_meteo.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa10_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa09_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa20_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa17_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa21_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa15_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa05_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa07_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa03_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa06_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa11_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa19_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\geo_coordinates.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa14_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\instrument_data.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\time_coordinates.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\tie_geo_coordinates.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa18_radiance.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\tie_geometries.nc', 
'C:/Users/EUMETCAST#/Downloads\\S3A_OL_1_EFR____20210102T100323_20210102T100623_20210102T114650_0179_067_022_2700_LN1_O_NR_002\\Oa08_radiance.nc'}

Environment Info:

• OS: Windows 10
• Satpy Version: Latest github master
• Readers and writers dependencies (when relevant): Check_satpy shows OK for the olci_l1b reader.

[djhoese]

Try not mixing / and \\ in your glob pattern. Use os.path.join to join the two parts of the pattern and see if Satpy behaves better. Also the # in your EUMETCAST# seems...suspect (read: odd).

[simonrp84]

Turns out this was a problem with the L1 data itself. For some reason the data we received had incorrect directory names (missing .SEN3 from the end). No idea what happened upstream, but at least it's not a satpy problem!

For reference, / and \\ don't present problems, and the # doesn't have an effect either. :-)

[mraspaud]

Or just a reason to grab #1500