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David Johnson authored
Now, if experimenters add users or groups to their nodes, and take an image, they must explicitly tell prepare to overwrite the master passwd/group/shadow files in /etc/emulab. For Linux, os_account_cleanup tried to update the masters automatically, but this is not fullproof and can result in the masters getting passwd hashes from shadow. Now, a diff of the non-shadow files is printed from prepare so that at least people can see that the masters need to be manually updated.
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