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Allow leading digits in userquota/groupquota names
While setting/getting userquota and groupquota properties, the input was not treated as a possible username or groupname if it had a leading digit. While useradd in linux recommends the regexp [a-z_][a-z0-9_-]*[$]? , it is not enforced. This causes problem for usernames with leading digits in them. We need to be able to support getting and setting properties for this unconventional but possible input category I've updated the code to validate the username or groupname directly via the API. Also, note that I moved this validation to the beginning before the check for SID names with @. This also supports usernames with @ character in them which are valid. Only when input with @ is not a valid username, it is interpreted as a potential SID name. Signed-off-by: Brian Behlendorf <[email protected]> Closes openzfs#428
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