Puppet users - Jul 2011 - How does checksum=>mtime work or does it really work?

Does checksum => mtime really work? I have a file that was checksum by
md5 and I want to change to checksum => mtime, but Puppet gave me
following error, which was really confusing:

------------------------------
Jul 11 15:00:55 vm1 puppet-agent[6820]:
(/Stage[main]/Emb/File[/opt/jetty/contexts/emb-context.xml]/content)
change from {mtime}Thu Jul 07 10:45:31 -0700 2011 to
{md5}a0c859289703439db2a31e8d9d2d2cf6 failed: Could not rename
temporary file /opt/jetty/contexts/emb-context.xml.puppettmp_4976 to
/opt/jetty/contexts/emb-context.xml: File written to disk did not
match checksum; discarding changes ({mtime} vs {mtime}Mon Jul 11
15:00:55 -0700 2011) at /etc/puppet/modules/emb/manifests/init.pp:78
at /etc/puppet/modules/emb/manifests/init.pp:78
-------------------------------

The message was really confusing since it reported that checksum did
not match, which should be the case, since Puppet was using the
current time to compare....I am really confused about what Puppet was
trying to do in this case (checksum => mtime). Could anyone care to
help a newcomer please?

Any help would be really appreciated,

Haitao

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