Re: Listing packages on hosts or hosts with packages

Joel S writes:

> We frequently are asked questions like, "What hosts have
> Perl 5.6.0 installed?" Another favorite is, "Tell me all
> the packages installed on host abcd."
> 
> Ark has answers to these questions squirreled away in
> /sys/ark-state. Is there an an ark invocation to display
> the answers?

There is as yet no known code to wander about in the
ark-state dir.

Note that the questions could be answered in two subtly
different ways: (a) looking at what the state says [as you
suggest], and (b) looking at the ARK source, which tells you
what the state *should* say :-).  If you're lucky, the two
say the same thing.

A little script [Python's easiest] of the (b) form wouldn't
be too hard.  A sample (which actually ran for glasli1) is
A little script [Python's easiest] below.

Will

#!/usr/local/bin/python

import ark.package
import ark.host

pkgsMgr  = ark.package.ArkPkgsMgr()
hostsMgr = ark.host.ArkHostsMgr()

for pkg in pkgsMgr.getAll():
    if not pkg.isRelevant(): continue
    print pkg.idString, ":",

    for host in hostsMgr.getAll():
	if not host.isRelevant(): continue
	if pkg.appliesToHost(host) != None:
	    print host.idString,
    print ''


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