Hi, all,
On Centos 5 I am programming RPM with python recently. When I read the online
RPM python programming guide at
http://docs.fedoraproject.org/drafts/rpm-guide-en/ch16s05.html, I got confused
at the EVR() function as the function returns the (epoch, version, release) as
a string “%epoch-%version-%release”, and so the RPM comparing process is
simplified as string comparing – which doesn’t look correct, am I wrong? See
the code from the page:
--------------------------------------------------------------------------------------
file_h = ts.hdrFromFdno(fd)
file_ds = file_h.dsOfHeader()
inst_ds = inst_h.dsOfHeader()
if file_ds.EVR() >= inst_ds.EVR():
print "Package file is same or newer, OK to upgrade."
else:
print "Package file is older than installed version."
--------------------------------------------------------------------------------------
I’ve see another function in rpm object: rpm.versionCompare(h1,h2) which
compare two rpm headers, Am I supposed to use this function or the EVR as
documented? The former one is not well documented, though.
Thanks.
-- Robinson
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