Only primary camera links pretty image

pocs/camera/camera.py

@@ -244,7 +244,7 @@ def process_exposure(self, info, observation_event, exposure_event=None):
             self.logger.debug("Extracting pretty image")
             img_utils.make_pretty_image(file_path,
                                         title=info['field_name'],
-                                        primary=info['is_primary'])
+                                        link_latest=info['is_primary'])
         except Exception as e:
             self.logger.warning('Problem with extracting pretty image: {}'.format(e))
 

pocs/utils/images/__init__.py

@@ -2,6 +2,7 @@
 import subprocess
 import shutil
 import re
+from contextlib import suppress
 
 from matplotlib import pyplot as plt
 from warnings import warn
@@ -63,20 +64,18 @@ def crop_data(data, box_width=200, center=None, verbose=False):
     return center
 
 
-def make_pretty_image(fname, timeout=15, **kwargs):  # pragma: no cover
-    """ Make a pretty image
+def make_pretty_image(fname, timeout=15, link_latest=False, **kwargs):  # pragma: no cover
+    """Make a pretty image
 
     This will create a jpg file from either a CR2 (Canon) or FITS file.
 
-    Notes:
-        See `$POCS/scripts/cr2_to_jpg.sh` for CR2 process
-
     Arguments:
-        fname {str} -- Name of image file, may be either .fits or .cr2
-        **kwargs {dict} -- Additional arguments to be passed to external script
-
-    Keyword Arguments:
-        timeout {number} -- Process timeout (default: {15})
+        fname (str): Name of image file, may be either .fits or .cr2.
+        timeout (int, optional): Timeout for image conversion in seconds,
+            default 15 seconds.
+        link_latest (bool, optional): If the pretty picture should be linked to
+            `$PANDIR/images/latest.jpg`, default False.
+        **kwargs: Additional keyword arguments passed to the conversion methods.
 
     Returns:
         str -- Filename of image that was created
@@ -94,20 +93,21 @@ def make_pretty_image(fname, timeout=15, **kwargs):  # pragma: no cover
         return None
 
     # Symlink latest.jpg to the image; first remove the symlink if it already exists.
-    if os.path.exists(pretty_path) and pretty_path.endswith('.jpg'):
-        latest_path = '{}/images/latest.jpg'.format(os.getenv('PANDIR'))
-        try:
+    if link_latest and os.path.exists(pretty_path):
+        latest_path = os.path.join(
+            os.getenv('PANDIR'),
+            'images',
+            'latest.jpg'
+        )
+        with suppress(FileNotFoundError):
             os.remove(latest_path)
-        except FileNotFoundError:
-            pass
+
         try:
             os.symlink(pretty_path, latest_path)
         except Exception as e:
             warn("Can't link latest image: {}".format(e))
 
-        return pretty_path
-    else:
-        return None
+    return pretty_path
 
 
 def _make_pretty_from_fits(