--
-- logger.lua
-- script version 0.93
--
-- meant to run from Scripts::PM::Post
--
-- Matthew Miller <mattdm@mattdm.org> and Joe Szep <jszep@bu.edu> 
--
-- Includes ideas/bits from Panu Matilainen, too.
-- 
-- Writes a message to /var/log/messages for each package successfully
-- installed or removed, and for packages which fail to install or remove.
--
-- Also, provides a double check which causes apt to error out if a
-- transaction didn't go as expected.
--

-- Don't log if logging is turned off.
if confget("RPM::Log-Info/b", "true") == "false" then
    return
end

-- Don't log when in --test mode.
configs = { "RPM::Options", "RPM::Install-Options", "RPM::Erase-Options" }
for i, conf in ipairs(configs) do
    rpmopts = confgetlist(conf, "")
    for j, opt in ipairs(rpmopts) do
        if string.find(opt, "test") then
            return
        end
    end
end

-- change the 'kernel#version' hack back to just the base package name
function unmungepackagename(packagename)
    fixedname,i=string.gsub(packagename,"#.*$",'')
    return fixedname
end

-- Check using RPM to see what the actual result is
function isversioninstalled(checkpackagename,checkversionstr)

    if string.find(checkversionstr,':') then
       -- use epoch
       querypattern='%{epoch}:%{version}-%{release}\n'
    else
       querypattern='%{version}-%{release}\n'
    end       

    verlist = io.popen("rpm --nosignature --nodigest --nomd5 --qf '"..querypattern.."' -q "..checkpackagename)

    for line in verlist:lines() do
        if line == checkversionstr then
            -- print("DEBUG: version "..checkversionstr.." of "..checkpackagename.." found.")
            return true
        end
    end

    -- print("DEBUG: version "..checkversionstr.." of "..checkpackagename.." NOT found.")
    return false

end


-- Helper function to pick the right words for the log message
function gettransactiontype(checkpackage)
   if statnewinstall(checkpackage) then
       return "install"
   elseif statinstall(checkpackage) then
       return "upgrade"
   elseif statremove(checkpackage) then
       return "remove"
   elseif statdowngrade(checkpackage) then
       return "downgrade"
   elseif statkeep(checkpackage) then
       return "keep"
   else
       return "do something strange with"
   end
end

-- Another helper function to pick the right words for the log message
function getpasttransactiontype(checkpackage)
   if statnewinstall(checkpackage) then
       return "installed"
   elseif statinstall(checkpackage) then
       return "upgraded"
   elseif statremove(checkpackage) then
       return "removed"
   elseif statdowngrade(checkpackage) then
       return "downgraded"
   elseif statkeep(checkpackage) then
       return "kept"
   else
       return "did something strange with"
   end
end


-- And, now, go through all the to-be installed packages and check and log
if pkgs_install then
   
    for i, attemptedpkg in pairs(pkgs_install) do

        attemptedverstr = verstr(pkgverinst(attemptedpkg))
        attemptedpkgname = unmungepackagename(pkgname(attemptedpkg))

        if isversioninstalled(attemptedpkgname,attemptedverstr) then
            logstring='successfully '..getpasttransactiontype(attemptedpkg)..' package: '..attemptedpkgname..' ('..attemptedverstr..')'
        else
            logstring='FAILED to '..gettransactiontype(attemptedpkg)..' package: '..attemptedpkgname..' ('..attemptedverstr..')'
            apterror(logstring)
        end
        -- print("DEBUG: LOG: "..logstring)
        os.execute('/usr/bin/logger -t apt-get "'..logstring..'"')
    end

end

-- And same for to-be-removed, but with the check reversed.
if pkgs_remove then

    for i, attemptedpkg in pairs(pkgs_remove) do

        -- use 'current' version -- that's what *was* current.
        attemptedverstr = verstr(pkgvercur(attemptedpkg))
        attemptedpkgname = unmungepackagename(pkgname(attemptedpkg))

        if not isversioninstalled(attemptedpkgname,attemptedverstr) then
            logstring='successfully '..getpasttransactiontype(attemptedpkg)..' package: '..attemptedpkgname..' ('..attemptedverstr..')'
        else
            logstring='FAILED to '..gettransactiontype(attemptedpkg)..' package: '..attemptedpkgname..' ('..attemptedverstr..')'
            apterror(logstring)
        end
        -- print("DEBUG: LOG: "..logstring)
        os.execute('/usr/bin/logger -t apt-get "'..logstring..'"')
    end

end