Todd Gamblin 650786c812 locks: improve errors and permission checking ... - Clean up error messages for when a lock can't be created, or when an exclusive (write) lock can't be taken on a file. - Add a number of subclasses of LockError to distinguish timeouts from permission issues. - Add an explicit check to prevent the user from taking a write lock on a read-only file. - We had a check for this for when we try to *upgrade* a lock on an RO file, but not for an initial write lock attempt. - Add more tests for different lock permission scenarios.		2018-07-12 19:59:53 +02:00
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spack	locks: improve errors and permission checking	2018-07-12 19:59:53 +02:00