[clug] Sorting Version Numbers
jeffm at ghostgun.com
Tue Jan 9 04:26:14 UTC 2018
On 9/01/2018 11:04, Luke Mewburn wrote:
> | Anyone have any thoughts on this?
> Like you probably did, I did some searching on the web
> and experimentation.
> Your email prompted me to look into this again,
> because I've had the same requirement...
> My findings, in most-useful to least-useful order :)
> 1. Use yum tools that already exist: package-cleanup
> I found
> package-cleanup --oldkernels --count=3
> (in yum-utils on CentOS 6/7) seemed to do the right thing.
> For one of my build systems where I have other kernel-devel packages
> that I want to keep, I instead used:
> package-cleanup --oldkernels --keepdevel --count=3
> See: https://www.centos.org/forums/viewtopic.php?t=2120
Didn't know this one about this one which I guess is I asked. From that
web page it seems adding installonly_limit=3 to /etc/yum.conf may remove
my need for this step all together though some of the reports also state
that it doesn't work.
It still seems I need to run,
grub2-mkconfig -o /boot/grub2/grub.cfg
which isn't a problem. I've used these two steps on a number of machines
today and it's been working fine.
> 2. Use sort -V. (not quite there).
> The "sort --version-compare" (AKA "sort -V") option in GNU
> coreutils sort (which is on el7) almost does the right thing,
> except that it doesn't list the "unpatched" kernel first.
> E.g., given your input
> with the addition of
> sort -V orders as
> where the last line should be the 2nd.
> See: https://serverfault.com/questions/601427/sort-installed-packages-version
Came across this after posting the email. Read the man page (
) and didn't realise that the caveats would bite me. My test case isn't
as complete as it should be. You've save me from potentially deleting a
needed kernel sometime in the future.
> 3. Implement your own python script importing rpmUtils (in yum)
> Requires a bunch of mucking about with the guts of rpmUtils.
> Probably not worth it.
> See: http://blog.jasonantman.com/2014/07/how-yum-and-rpm-compare-versions/
Yeah, I'm trying to avoid that at all cost. It just introduces yet more
stuff I have to maintain.
Base on what you've told me number 1 is the the way to go.
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