CentOS Yum Upgrade Diff script

upgdiff.rb

# upgdiff.rb
#
# Prints the change in versions that will happen if "yum upgrade" is
# run on this CentOS/RHEL server, and if any of the upgrades will come
# from third party repositories.
#
# For example:
#
# [root@server] $ ruby upgdiff.rb
#          yum-utils: 1.1.16-14.el5.centos.1 ==> 1.1.16-21.el5.centos 
#               zlib: 1.2.3-3 ==> 1.2.3-4.el5 **somecustomrepo*
# [root@server] $
#
# James Hannah - 2012

pkgcache = {}
`rpm -qa --qf "%{NAME} %{VERSION}-%{RELEASE} %{VENDOR}\n"`.each_line do |l|
    (name,current,vendor) = l.split(" ")
    pkgcache[name] = {:current=>current,:vendor=>vendor}
end
`yum check-update`.each_line do |up|
    (name,upgrade,repo) = up.split
    next if name == nil
    pkgname = name.split(".")[0]
    if pkgcache.keys.include?(pkgname)
        pkgcache[pkgname][:upgrade] = upgrade
        pkgcache[pkgname][:repo] = repo
    end
end
pkgcache.sort.each do |pkgname,info|
    next unless info.keys.include? :upgrade
    next if info[:current] == info[:upgrade]
    unless ["base","updates","extra"].include?(info[:repo]) 
        # check if we previously had CentOS as the vendor, but are now going to 3rd party repo
        repowarn = (info[:vendor]=="CentOS") ? "!!!! UPGRADE TO 3RD PARTY !!!!" : ""
        repo = "**#{info[:repo]}**#{repowarn}"
    end
    puts "#{pkgname.rjust(30)}: #{info[:current]} ==> #{info[:upgrade]} #{repo}"
end