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https://issues.apache.org/jira/browse/HADOOP-9778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13720981#comment-13720981
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Colin Patrick McCabe commented on HADOOP-9778:
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Here's an idea: why not make the validation configurable? I don't think there
is a great demand for zany user names, and if we shell-expand them in even one
place, we could have problems. Probably the default validation pattern for
windows should be different and include spaces.
I haven't actually found a place where we shell expand user names (despite its
name, ShellBasedUnixGroupsMapping doesn't actually create a shell).
> Remove user name and group name validation logic from chown and chgrp shell
> commands.
> -------------------------------------------------------------------------------------
>
> Key: HADOOP-9778
> URL: https://issues.apache.org/jira/browse/HADOOP-9778
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs
> Affects Versions: 3.0.0, 2.3.0
> Reporter: Chris Nauroth
> Priority: Minor
>
> The chown and chgrp shell commands enforce a valid set of characters for user
> names and group names. The validation rules for user names and group names
> vary across different OSes, so this is a portability problem and a
> maintenance burden. It requires us to change the code every time we discover
> a difference in the rules. I propose that we remove this validation logic
> and instead pass through input user names and group names to the OS. We can
> handle error reporting by catching errors returned from the OS.
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