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From "Greg Roelofs (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-7089) Use readlink to get absolute paths in the scripts
Date Thu, 06 Jan 2011 04:27:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12978117#action_12978117
] 

Greg Roelofs commented on HADOOP-7089:
--------------------------------------

...and looks like older versions of GNU readlink don't accept the -m option.  This is the
--help output from version 5.2.1:

  -f, --canonicalize      canonicalize by following every symlink in every
                          component of the given path recursively
  -n, --no-newline        do not output the trailing newline
  -q, --quiet,
  -s, --silent            suppress most error messages
  -v, --verbose           report error messages
      --help     display this help and exit
      --version  output version information and exit


> Use readlink to get absolute paths in the scripts 
> --------------------------------------------------
>
>                 Key: HADOOP-7089
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7089
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: scripts
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>            Priority: Minor
>             Fix For: 0.22.0, 0.23.0
>
>         Attachments: hadoop-7089-1.patch, hadoop-7089-1.patch
>
>
> The manual link resolution logic in bin/hadoop-config.sh can be replaced with readlink
-m -n.  Ditto with other uses of cd + pwd to get an absolute path, which can be fragile.

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