Created attachment 120303 [details]
Patch to fix "extension" option.

I think extension option works.

I run "logrotate -vf rot" twice
#cat rot
extension .ext
daily
create
rotate 5
somepath/foo.ext {
}
and i get
$ ls foo*
foo.1.ext  foo.2.ext  foo.ext

Now I see. I (and maybe also Bojan) thought about the config below:

#cat rot
extension .ext
daily
create
rotate 5
somepath/foo {
}

and "logrotate -vf rot" twice would get:
$ ls foo*
foo foo.1.ext foo.2.ext

So, if "somepath/foo.ext" was given, then no extension would be added because
foo.ext already had ".ext" in name, and the result would be "foo.ext.1,
foo.ext.2... But now I understand how it works. Maybe the option in man page
needs to be better described.

This is what the manual page claims:

extension ext
        Log files are given the final extension ext after  rotation.  If
        compression  is  used,  the compression extension (normally .gz)
        appears after ext.

From there, I was under the impression that the _rotated_ files will be given
this extension, not that one needs to _have_ files with that extension in order
for them to be rotated. If that was actually the desired behaviour, then the
manual page should say:

extension ext
        Log files with the extension ext can keep the extension after
        rotation. If compression  is  used,  the compression extension
        (normally .gz) appears after ext.

Then the manual page would actually match what logrotate does.