Andrew Wang created HDFS-4765:
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Summary: Permission check of symlink deletion incorrectly throws
UnresolvedLinkException
Key: HDFS-4765
URL: https://issues.apache.org/jira/browse/HDFS-4765
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 2.0.3-alpha, 3.0.0
Reporter: Andrew Wang
Assignee: Andrew Wang
With permissions enabled, the permission check in {{FSNamesystem#delete}} will
incorrectly throw an UnresolvedLinkException if the path contains a symlink.
This leads to FileContext resolving the symlink and instead deleting the link
target.
The correct check is to see if the user has write permissions on the parent
directory of the symlink, e.g.
{noformat}
-> % ls -ld symtest
drwxr-xr-x 2 root root 4096 Apr 26 14:12 symtest
-> % ls -l symtest
total 12
lrwxrwxrwx 1 root root 6 Apr 26 14:12 link -> target
-rw-r--r-- 1 root root 0 Apr 26 14:11 target
-> % rm -f symtest/link
rm: cannot remove `symtest/link': Permission denied
-> % sudo chown andrew symtest
-> % rm -f symtest/link
-> %
{noformat}
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