The FileSystem object from hadoop is contained inside the
HDataStorage (which you get as a DataStorage object in GruntParser.
The ElementDescriptor interface that DataStorage gives you doesn't
have functions for permissions modifications. That will need to be
added, then HPath and LocalPath updated to implement these functions
for hadoop and local files. In HPath, you'll be able to get a
reference to the FileSystem object via fs.getHFS().
Alan.
On Nov 13, 2008, at 6:21 PM, Ian Holsman wrote:
Hi Alan.
thats not the problem as I have really. In order to change the
permissions I need access to a 'FileSystem' object. but I don't see
how to get one
the code in hadoop to do the same thing is in FsShellPermissions
public void run(FileStatus file, FileSystem srcFs) throws
IOException {
FsPermission perms = file.getPermission();
int existing = perms.toShort();
boolean exeOk = file.isDir() || (existing & 0111) != 0;
int newperms = ( applyChmod(userType, userMode,
(existing>>>6)&7, exeOk) << 6 |
applyChmod(groupType, groupMode,
(existing>>>3)&7, exeOk) << 3 |
applyChmod(othersType, othersMode,
existing&7, exeOk) );
if (existing != newperms) {
try {
srcFs.setPermission(file.getPath(),
new FsPermission((short)newperms));
} catch (IOException e) {
System.err.println(getName() + ": changing permissions of
'" +
file.getPath() + "':" + e.getMessage());
}
}
}
which I presume is the only way to do it.
Alan Gates wrote:
Take a look at org.apache.pig.tools.grunt.GruntParser.java. All
of the file system commands are implemented in there. That's
probably also where you chmod et al should go.
Alan.
On Nov 9, 2008, at 5:22 PM, Ian Holsman wrote:
hi.
I was about to add these commands into the grunt command shell,
but I couldn't for the life of me figure out how to actually get
to the FileSystem object so I could change fire off the command.
any hints on how to do this?
-- Ian
