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More helpful error message when the database is locked

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This commit is contained in:
Kovid Goyal 2007-12-10 17:06:39 +00:00
parent 90d0ed2136
commit 8f9bb12c7f
2 changed files with 12 additions and 7 deletions
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4
src/libprs500/gui2/main.py
View File

@ -801,9 +801,9 @@ def main(args=sys.argv):
initialize_file_icon_provider()
try:
main = Main()
except DatabaseLocked:
except DatabaseLocked, err:
QMessageBox.critical(None, 'Cannot Start '+__appname__,
'Another program is using the database. Perhaps %s is already running?'%(__appname__,))
'<p>Another program is using the database. <br/>Perhaps %s is already running?<br/>If not try deleting the file %s'%(__appname__, err.lock_file_path))
return 1
sys.excepthook = main.unhandled_exception
return app.exec_()

15
src/libprs500/library/database.py
View File

@ -42,33 +42,38 @@ class Concatenate(object):
_lock_file = None
class DatabaseLocked(Exception):
pass
def __init__(self, msg, lock_file_path):
Exception.__init__(self, msg)
self.lock_file_path = lock_file_path
def _lock(path):
path = os.path.join(os.path.dirname(path), '.'+os.path.basename(path)+'.lock')
global _lock_file
if _lock_file is not None:
raise DatabaseLocked('Database already locked in this instance.')
raise DatabaseLocked('Database already locked in this instance.', _lock_file.name)
try:
_lock_file = open(path, 'wb')
except IOError:
raise DatabaseLocked('Database in use by another instance')
raise DatabaseLocked('Database in use by another instance', _lock_file.name)
try:
import fcntl, errno
try:
fcntl.lockf(_lock_file.fileno(), fcntl.LOCK_EX|fcntl.LOCK_NB)
except IOError, err:
path = _lock_file.name
_lock_file = None
if err.errno in (errno.EACCES, errno.EAGAIN):
raise DatabaseLocked('Database in use by another instance')
raise DatabaseLocked('Database in use by another instance', path)
except ImportError:
try:
import msvcrt
try:
msvcrt.locking(_lock_file.fileno(), msvcrt.LK_NBLCK, 1)
except IOError:
path = _lock_file.name
_lock_file = None
raise DatabaseLocked('Database in use by another instance')
raise DatabaseLocked('Database in use by another instance', path)
except ImportError:
pass