Todd Gamblin 54201e3c02 locks: add configuration and command-line options to enable/disable locks (#7692) ... - spack.util.lock behaves the same as llnl.util.lock, but Lock._lock and Lock._unlock do nothing. - can be disabled with a control variable. - configuration options can enable/disable locking: - `locks` option in spack configuration controls whether Spack will use filesystem locks or not. - `-l` and `-L` command-line options can force-disable or force-enable locking. - Spack will check for group- and world-writability before disabling locks, and it will not allow a group- or world-writable instance to have locks disabled. - update documentation		2018-05-18 14:41:03 -07:00
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spack	locks: add configuration and command-line options to enable/disable locks (#7692)	2018-05-18 14:41:03 -07:00