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Nicer error message when failing to open exclusive file

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Kovid Goyal 2013-11-05 13:13:13 +05:30
parent 3164269793
commit 1306591499
1 changed files with 11 additions and 8 deletions
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9
src/calibre/utils/lock.py
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@ -28,8 +28,8 @@ class WindowsExclFile(object):
0, # Open exclusive 0, # Open exclusive
None, # No security attributes None, # No security attributes
w.OPEN_ALWAYS, # If file does not exist, create it w.OPEN_ALWAYS, # If file does not exist, create it
w.FILE_ATTRIBUTE_NORMAL, #Normal attributes w.FILE_ATTRIBUTE_NORMAL, # Normal attributes
None, #No template file None, # No template file
) )
break break
except pywintypes.error as err: except pywintypes.error as err:
@ -38,6 +38,8 @@ class WindowsExclFile(object):
continue continue
else: else:
raise raise
if not hasattr(self, '_handle'):
raise Exception('Failed to open exclusive file: %s' % path)
def seek(self, amt, frm=0): def seek(self, amt, frm=0):
import win32file as w import win32file as w
@ -67,7 +69,8 @@ class WindowsExclFile(object):
import win32file as w import win32file as w
sz = w.GetFileSize(self._handle) sz = w.GetFileSize(self._handle)
max = sz - self.tell() max = sz - self.tell()
if bytes < 0: bytes = max if bytes < 0:
bytes = max
bytes = min(max, bytes) bytes = min(max, bytes)
if bytes < 1: if bytes < 1:
return '' return ''