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https://issues.apache.org/jira/browse/CASSANDRA-13211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15863162#comment-15863162
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Nate McCall commented on CASSANDRA-13211:
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I have a vague recollection of dealing with pseudoterminal ownership issues
when doing {{su}}, so I could see this. [~brandon.williams] probably has a lot
better bash foo than me.
> cassandra shell script uses bad approach to write "Unable to find java" error
> to stderr, causing real issue to be masked by a permission error if user has
> changed user since logging in
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-13211
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13211
> Project: Cassandra
> Issue Type: Bug
> Reporter: Max Bowsher
>
> The cassandra startup shell script contains this line:
> echo Unable to find java executable. Check JAVA_HOME and PATH environment
> variables. > /dev/stderr
> The problem here is the construct "> /dev/stderr". If the user invoking
> Cassandra has changed user (for example, by SSHing in as a personal user, and
> then sudo-ing to an application user responsible for executing the Cassandra
> daemon), then the attempt to open /dev/stderr will fail, because it will
> point to a PTY node under /dev/pts/ owned by the original user.
> Ultimately this leads to the real problem being masked by the confusing error
> message "bash: /dev/stderr: Permission denied".
> The correct technique is to replace "> /dev/stderr" with ">&2" which will
> write to the already open stderr file descriptor, instead of resolving the
> chain of symlinks starting at /dev/stderr, and attempting to reopen the
> target by name.
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