Massimiliano Culpo 8ad2cc2acf Environments: Avoid inconsistent state on failed write (#18538) ... Fixes #18441 When writing an environment, there are cases where the lock file for the environment may be removed. In this case there was a period between removing the lock file and writing the new manifest file where an exception could leave the manifest in its old state (in which case the lock and manifest would be out of sync). This adds a context manager which is used to restore the prior lock file state in cases where the manifest file cannot be written.		2020-09-11 10:57:29 -07:00
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spack	Environments: Avoid inconsistent state on failed write (#18538)	2020-09-11 10:57:29 -07:00