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Nicer error message when failing to open exclusive file

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This commit is contained in:
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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19
src/calibre/utils/lock.py
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@ -24,12 +24,12 @@ class WindowsExclFile(object):
timeout -= 1
try:
self._handle = w.CreateFile(path,
w.GENERIC_READ|w.GENERIC_WRITE, # Open for reading and writing
0, # Open exclusive
None, # No security attributes
w.OPEN_ALWAYS, # If file does not exist, create it
w.FILE_ATTRIBUTE_NORMAL, #Normal attributes
None, #No template file
w.GENERIC_READ|w.GENERIC_WRITE, # Open for reading and writing
0, # Open exclusive
None, # No security attributes
w.OPEN_ALWAYS, # If file does not exist, create it
w.FILE_ATTRIBUTE_NORMAL, # Normal attributes
None, # No template file
)
break
except pywintypes.error as err:
@ -38,6 +38,8 @@ class WindowsExclFile(object):
continue
else:
raise
if not hasattr(self, '_handle'):
raise Exception('Failed to open exclusive file: %s' % path)
def seek(self, amt, frm=0):
import win32file as w
@ -67,7 +69,8 @@ class WindowsExclFile(object):
import win32file as w
sz = w.GetFileSize(self._handle)
max = sz - self.tell()
if bytes < 0: bytes = max
if bytes < 0:
bytes = max
bytes = min(max, bytes)
if bytes < 1:
return ''
@ -110,7 +113,7 @@ class ExclusiveFile(object):
self.timeout = timeout
def __enter__(self):
self.file = WindowsExclFile(self.path, self.timeout) if iswindows else open(self.path, 'a+b')
self.file = WindowsExclFile(self.path, self.timeout) if iswindows else open(self.path, 'a+b')
self.file.seek(0)
timeout = self.timeout
if not iswindows: