path: root/apt-panopticon.lua

#!/usr/bin/env luajit

local now = os.time()

local APT = require 'apt-panopticommon'
local D = APT.D
local I = APT.I
local T = APT.T
local W = APT.W
local E = APT.E
local C = APT.C
local arg, sendArgs = APT.parseArgs({...})
APT.html = true


local defaultURL = {scheme = "http"}
local releaseFiles =
{
    -- Release file.
    "Release",				-- 3.7 MB
    "Release.gpg",			--
--    "InRelease",			-- 3.7 MB
--    "main/binary-all/Packages.xz",	-- 2.6 GB for all that changed recently.
    -- Contents files.			-- 3.3 GB
--    "main/Contents-all.xz",
--    "main/Contents-amd64.xz",
--    "main/Contents-arm64.xz",
--    "-security/main/Contents-all.xz",
--    "-security/main/Contents-amd64.xz",
--    "-security/main/Contents-arm64.xz",
}
local notExist =
{
    "ceres-security"	-- This will never exist, it's our code name for the testing suite.
}
local referenceDebs =
{
    -- Debian package.
    "merged/pool/DEBIAN/main/d/debian-keyring/debian-keyring_2024.06.24_all.deb",
    -- Debian security package.  NOTE this one should always be redirected?
    "merged/pool/DEBIAN-SECURITY/updates/main/a/apt/apt-transport-https_1.8.2.2_all.deb",
}
local referenceDevs =
{
    -- Devuan package.  NOTE this one should not get redirected, but that's more a warning than an error.
    "merged/pool/DEVUAN/main/d/devuan-keyring/devuan-keyring_2023.10.07_all.deb",	-- Devuan keeps changing this since the key expiry incident.
    -- Hmmm used to be _all, but it was split to the individual archs.  Seems pointless, each one is the same size as the previous all.
    "merged/pool/DEVUAN/main/b/base-files/base-files_13.5devuan1_amd64.deb",
}

local keyring = "/usr/share/keyrings/devuan-archive-keyring.gpg"
--local keyring = "/etc/apt/trusted.gpg.d/devuan-keyring-2022-archive.gpg"

local curlStatus = 
{
    [1 ] = "Unsupported protocol. This build of curl has no support for this protocol.",
    [2 ] = "Failed to initialize.",
    [3 ] = "URL malformed. The syntax was not correct.",
    [4 ] = "A feature or option that was needed to perform the desired request was not enabled or was explicitly disabled at build-time. To make curl able to do this, you probably need another build of libcurl!",
    [5 ] = "Couldn't resolve proxy. The given proxy host could not be resolved.",
    [6 ] = "Couldn't resolve host. The given remote host was not resolved.",
    [7 ] = "Failed to connect to host.",
    [8 ] = "Weird server reply. The server sent data curl couldn't parse.",
    [9 ] = "FTP access denied. The server denied login or denied access to the particular resource or directory you wanted to reach. Most often you tried to change to a directory that doesn't exist on the server.",
    [10] = "While waiting for the server to connect back when an active FTP session is used, an error code was sent over the control connection or similar.",
    [11] = "FTP weird PASS reply. Curl couldn't parse the reply sent to the PASS request.",
    [12] = "During an active FTP session while waiting for the server to connect, the CURLOPT_ACCEPTTIMEOUT_MS (or the internal default) timeout expired.",
    [13] = "FTP weird PASV reply, Curl couldn't parse the reply sent to the PASV request.",
    [14] = "FTP weird 227 format. Curl couldn't parse the 227-line the server sent.",
    [15] = "FTP can't get host. Couldn't resolve the host IP we got in the 227-line.",
    [16] = "A problem was detected in the HTTP2 framing layer. This is somewhat generic and can be one out of several problems, see the error buffer for details.",
    [17] = "FTP couldn't set binary. Couldn't change transfer method to binary.",
    [18] = "Partial file. Only a part of the file was transferred.",
    [19] = "FTP couldn't download/access the given file, the RETR (or similar) command failed.",

    [21] = "FTP quote error. A quote command returned error from the server.",
    [22] = "HTTP page not retrieved. The requested url was not found or returned another error with the HTTP error code being 400 or above. This return code only appears if -f, --fail is used.",
    [23] = "Write error. Curl couldn't write data to a local filesystem or similar.",

    [25] = "FTP couldn't STOR file. The server denied the STOR operation, used for FTP uploading.",
    [26] = "Read error. Various reading problems.",
    [27] = "Out of memory. A memory allocation request failed.",
    [28] = "Operation timeout. The specified time-out period was reached according to the conditions.",

    [30] = "FTP PORT failed. The PORT command failed. Not all FTP servers support the PORT command, try doing a transfer using PASV instead!",
    [31] = "FTP couldn't use REST. The REST command failed. This command is used for resumed FTP transfers.",

    [33] = "HTTP range error. The range \"command\" didn't work.",
    [34] = "HTTP post error. Internal post-request generation error.",
    [35] = "SSL connect error. The SSL handshaking failed.",
    [36] = "FTP bad download resume. Couldn't continue an earlier aborted download.",
    [37] = "FILE couldn't read file. Failed to open the file. Permissions?",
    [38] = "LDAP cannot bind. LDAP bind operation failed.",
    [39] = "LDAP search failed.",

    [41] = "Function not found. A required LDAP function was not found.",
    [42] = "Aborted by callback. An application told curl to abort the operation.",
    [43] = "Internal error. A function was called with a bad parameter.",

    [45] = "Interface error. A specified outgoing interface could not be used.",

    [47] = "Too many redirects. When following redirects, curl hit the maximum amount.",
    [48] = "Unknown option specified to libcurl. This indicates that you passed a weird option to curl that was passed on to libcurl and rejected. Read up in the manual!",
    [49] = "Malformed telnet option.",

    [51] = "The peer's SSL certificate or SSH MD5 fingerprint was not OK.",
    [52] = "The server didn't reply anything, which here is considered an error.",
    [53] = "SSL crypto engine not found.",
    [54] = "Cannot set SSL crypto engine as default.",
    [55] = "Failed sending network data.",
    [56] = "Failure in receiving network data.",

    [58] = "Problem with the local certificate.",
    [59] = "Couldn't use specified SSL cipher.",
    [60] = "Peer certificate cannot be authenticated with known CA certificates.",
    [61] = "Unrecognized transfer encoding.",
    [62] = "Invalid LDAP URL.",
    [63] = "Maximum file size exceeded.",
    [64] = "Requested FTP SSL level failed.",
    [65] = "Sending the data requires a rewind that failed.",
    [66] = "Failed to initialise SSL Engine.",
    [67] = "The user name, password, or similar was not accepted and curl failed to log in.",
    [68] = "File not found on TFTP server.",
    [69] = "Permission problem on TFTP server.",
    [70] = "Out of disk space on TFTP server.",
    [71] = "Illegal TFTP operation.",
    [72] = "Unknown TFTP transfer ID.",
    [73] = "File already exists (TFTP).",
    [74] = "No such user (TFTP).",
    [75] = "Character conversion failed.",
    [76] = "Character conversion functions required.",
    [77] = "Problem with reading the SSL CA cert (path? access rights?).",
    [78] = "The resource referenced in the URL does not exist.",
    [79] = "An unspecified error occurred during the SSH session.",
    [80] = "Failed to shut down the SSL connection.",
    [81] = "Socket is not ready for send/recv wait till it's ready and try again. This return code is only returned from curl_easy_recv and curl_easy_send.",
    [82] = "Could not load CRL file, missing or wrong format (added in 7.19.0).",
    [83] = "Issuer check failed (added in 7.19.0).",
    [84] = "The FTP PRET command failed",
    [85] = "RTSP: mismatch of CSeq numbers",
    [86] = "RTSP: mismatch of Session Identifiers",
    [87] = "unable to parse FTP file list",
    [88] = "FTP chunk callback reported error",
    [89] = "No connection available, the session will be queued",
    [90] = "SSL public key does not matched pinned public key",
    [91] = "Status returned failure when asked with CURLOPT_SSL_VERIFYSTATUS.",
    [92] = "Stream error in the HTTP/2 framing layer.",
    [93] = "An API function was called from inside a callback.",
    [94] = "An authentication function returned an error.",
    [95] = "A problem was detected in the HTTP/3 layer. This is somewhat generic and can be one out of several problems, see the error buffer for details.",
}


local socket = require 'socket'
local ftp = require 'socket.ftp'
local http = require 'socket.http'
local url = require 'socket.url'


local ip = ""
local cor = nil
local Updating = false

local downloadLock = "flock -n results/curl-"
local arw = ' &nbsp; <font color="magenta"><b>-></b></font> &nbsp; '

local repoExists = function (r)
    r = r:match("([%a-]*)")
    if nil == r then return false end
    for k, v in pairs(notExist) do
	if v == r then return false end
    end
    return true
end

local IP = {}
gatherIPs = function (host, again)
    if nil == again then again = '' end
    if nil == IP[host] then
        local IPs
        -- Takes about 30 seconds to look up the lot.
        -- I tested using dig's -f option, it didn't seem much faster.
        -- The sort -r assumes that deb.devuan.org is the first alphabetically.
        if "" == host then print("Empty host name!") end
	local dig = APT.readCmd('dig ' .. again .. ' +keepopen +noall +nottlid +answer ' .. host .. ' A ' .. host .. ' AAAA ' .. host .. ' CNAME ' .. host .. ' SRV | sort -r | uniq')
	for i,IPs in ipairs(dig) do
	    for k, t, v in IPs:gmatch("([%w_%-%.]*)%.%s*IN%s*(%a*)%s*(.*)") do
		if "." == v:sub(-1, -1) then v = v:sub(1, -2) end
		if nil == IP[k] then IP[k] = {} end
		IP[k][v] = t
		D("  DNS record " .. host .. " == " .. k .. " type " .. t .. " -> " .. v)
		if t == "CNAME" then
		    if "" == v then
			if '' ~= again then
			    print("Empty host name!  DNS record " .. host .. " == " .. k .. " type " .. t .. " -> " .. v)
			else
			    return gatherIPs(host, '@9.9.9.11')
			end
		    else
			gatherIPs(v)
			IP[k][v] = IP[v]
		    end
		elseif v == "SRV" then
		    print("SVR record found, now what do we do?")
		elseif "" == v then
		    if '' ~= again then
			print("Empty host name!  DNS record " .. host .. " == " .. k .. " type " .. t .. " -> " .. v)
		    else
			return gatherIPs(host, '@9.9.9.11')
		    end
		end
	    end
	end
    end

    -- If this is the DNS-RR domain name, gather the IPs for the mirrors that mirror_list.txt says should be in it.
    if host == APT.options.roundRobin.value then
	for k, m in pairs(APT.mirrors) do
	    if ("yes" == m.DNSRR) or ("maybe" == m.DNSRR) then
		if "" == m.FQDN then
		    print("Empty FQDN name! " .. host)
		end
		gatherIPs(m.FQDN)
		IP[host][m.FQDN] = IP[m.FQDN]
		-- Strip them out so we don't test them twice.
		if (nil ~= IP[m.FQDN]) and (nil ~= IP[host][APT.options.roundRobinCname.value]) then
		    for l, n in pairs(IP[m.FQDN]) do
			if type(n) == 'table' then
			    for h, p in pairs(n) do
				for j, o in pairs(IP[host][APT.options.roundRobinCname.value]) do
				    if h == j then IP[host][m.FQDN][l][h] = nil end
				end
				o = 0
				for j in pairs(IP[host][m.FQDN][l]) do o = o + 1 end
				if 0 == o then IP[host][m.FQDN][l] = nil end
			    end
			else
			    for j, o in pairs(IP[host][APT.options.roundRobinCname.value]) do
				if l == j then IP[host][m.FQDN][l] = nil end
			    end
			end
			o = 0
			for j in pairs(IP[host][m.FQDN]) do o = o + 1 end
			if 0 == o then IP[host][m.FQDN] = nil end
		    end
		end
	    end
	end
    end
    return IP[host]
end

-- Returns FTP directory listing
local nlst = function (u)
    local t = {}
    local p = url.parse(u)
    p.command = "nlst"
    p.sink = ltn12.sink.table(t)
    local r, e = ftp.get(p)
    return r and table.concat(t), e
end

local timeouts = 0;
local totalTimeouts = 0
local spcd = ' &nbsp; '
checkHEAD = function (host, URL, r, retry, sanity)
    if nil == r then r = 0 end
    if nil == retry then retry = 0 end
    if true == sanity then sanity = 'URLSanity' else sanity = '' end
    local check = "HEAD testing file"
    local PU = url.parse(URL, defaultURL)
    local pu = url.parse(PU.scheme .. "://" .. host, defaultURL)
    local fname = host .. "_" .. PU.host .. "_" .. PU.path:gsub("/", "_") .. ".log.txt"
    local hdr = ""
    local IP = ""
    if pu.host ~= PU.host then
	if "http" == PU.scheme then
	    hdr = '-H "Host: ' .. host .. '"'
	end
	IP = '--connect-to "' .. pu.host .. '::' .. PU.host .. ':"'
	fname = host .. "_" .. pu.host .. '_' .. PU.host .. "_" .. PU.path:gsub("/", "_") .. ".txt"
    end
    os.execute('rm -f results/HEADERS_' .. fname .. ' 2>/dev/null; rm -f results/STATUS_' .. fname .. ' 2>/dev/null; touch results/STATUS_' .. fname)
    if not APT.testing(PU.scheme, host) and APT.redir then I(spcd .. string.upper(PU.scheme) .. " not supported, not tested. &nbsp; " .. URL, host); return end
    if 0 < r then
	check = "Redirecting to"
    end
    if 0 < retry then
	os.execute("sleep " .. math.random(1, 3))
	check = "Retry " .. retry .. " " .. check
    end
    if 2 <= timeouts then
	E(spcd .. spcd .. "too many timeouts!  " .. check .. " " .. host .. arw .. URL, PU.scheme, "", host)
	return
    end
    if APT.options.timeouts.value <= (totalTimeouts) then
	E(spcd .. spcd .. "Way too many timeouts!", PU.scheme, "", host)
	return
    end
    if 20 <= r then
	E(spcd .. spcd .. "too many redirects!  " .. check .. " " .. host .. arw .. URL, PU.scheme, "", host)
	return
    end
    if APT.options.retries.value <= retry then
	E(spcd .. spcd .. "too many retries!  " .. check .. " " .. host .. arw .. URL, PU.scheme, "", host)
	return
    end
    if "https" == PU.scheme and APT.options.roundRobin.value == host then
	I(spcd .. "Not testing " .. APT.lnk(URL) .. " mirrors wont have the correct HTTPS certificate for the round robin.", host)
	return
-- TODO - For some odd reason, sometimes one of these is nil.  Dig deeper to figure out why.
    elseif "https" == PU.scheme and (APT.mirrors[host] ~= nil) and (APT.mirrors[host].Protocols ~= nil) and (not APT.mirrors[host].Protocols.https) then
	I(spcd .. "Not testing " .. APT.lnk(URL) .. " host doesn't support HTTPS.", host)
	return
    else
	I(spcd .. check .. " " .. APT.lnk(URL), host)
    end

    --[[ Using curl command line -
	-I - HEAD
	--connect-to domain:port:IP:port - connect to IP, but use SNI from URL.
	-header "" - add extra headers.
	-L - DO follow redirects.
	--max-redirs n - set maximum redirects, default is 50, -1 = unlimited.
	-4 or -6 - Only use IPv4 or IPv6
	--retry n - maximum retries, default is 0, no retries.
	-o file - write to file instead of stdout.
	--path-as-is - https://curl.haxx.se/libcurl/c/CURLOPT_PATH_AS_IS.html might be useful for URLSanity.
	-s silent - don't output progress or error messages.
	--connect-timeout n - timeout in seconds.
	    Should return with error code 28 on a timeout?
	-D file - write the received headers to a file.  This includes the status code and string.
    ]]
    local status = APT.exe(
	'curl -I --retry 0 -s --path-as-is --connect-timeout ' .. APT.options.timeout.value .. ' --max-redirs 0 ' .. APT.IPv46 .. ' ' ..
	IP .. ' ' .. '-o /dev/null -D results/"HEADERS_' .. fname .. '" ' ..
	hdr .. ' -w "#%{http_code} %{ssl_verify_result} %{url_effective}\\n" ' .. PU.scheme .. '://' .. host .. PU.path .. ' >>results/"STATUS_' .. fname .. '"'
    ):timeout(APT.options.maxtime.value * 2.0):Nice():log():Do().status
    if 0 < r then
	APT.tested(PU.scheme, 'Redirects', host)
    else
	APT.tested(PU.scheme, '', host)
    end
    local code = "???"
    local cstr = ""
    local location = nil
    local tmot = 1
    while not APT.checkFile('results/STATUS_' .. fname) do
	D(spcd .. spcd .. 'Waiting for results/STATUS_' .. fname .. ' file.')
	os.execute('sleep ' .. tmot)
	tmot = tmot * 2
	if 8 < tmot then
	    T(spcd .. spcd .. "TIMEOUT " .. timeouts + 1 .. ", retry " .. retry + 1 .. ' ' .. APT.lnk(URL), PU.scheme, sanity, host)
	    timeouts = timeouts + 1
	    checkHEAD(host, URL, r, retry + 1, '' ~= sanity)
	    os.execute('cat results/"HEADERS_' .. fname .. '" >>results/"STATUS_' .. fname .. '" 2>/dev/null; rm -f results/"HEADERS_' .. fname .. '" 2>/dev/null')
	    return
	end
    end
    os.execute('cat results/"HEADERS_' .. fname .. '" >>results/"STATUS_' .. fname .. '" 2>/dev/null; rm -f results/"HEADERS_' .. fname .. '" 2>/dev/null')
    if 0 ~= status then
	local msg = curlStatus[status]
	if nil == msg then msg = "UNKNOWN CURL STATUS CODE!" end
	if (128+9 == status) or (124 == status) or (28 == status) or (7 == status) then
	    T(spcd .. spcd .. "TIMEOUT " .. timeouts + 1 .. ", retry " .. retry + 1 .. ' ' .. APT.lnk(URL), PU.scheme, sanity, host)
	    timeouts = timeouts + 1
	else
	    E(spcd .. spcd .. "The curl command return an error code of " .. status .. " - " .. msg .. ' for '.. APT.lnk(URL), PU.scheme, sanity, host)
	end
	if 60 == status then return end	-- Certificate is invalid, don't bother retrying.
	checkHEAD(host, URL, r, retry + 1, '' ~= sanity)
	return
    end
    local rfile, e = io.open("results/STATUS_" .. fname, "r")
    if nil == rfile then W("opening results/STATUS_" .. fname .. " file - " .. e) else
	for line in rfile:lines("*l") do
	    if "#" == line:sub(1, 1) then
		code = line:sub(2, 4)
		if ("https" == PU.scheme) and ("0" ~= line:sub(6, 6)) then
		    os.execute('cp results/STATUS_' .. fname .. ' results/STATUS_' .. fname .. '_SAVED')
		    if '' ~= sanity then
			E(spcd .. spcd .. "The certificate is invalid.", PU.scheme, sanity, host)
		    else
			E(spcd .. spcd .. "The certificate is invalid.", PU.scheme, "https", host)
		    end
		end
	    elseif "http" == line:sub(1, 4):lower() then
		-- -2 coz the headers file gets a \r at the end.
		cstr = line:sub(14, -2)
	    elseif "location" == line:sub(1, 8):lower() then
		location = line:sub(11, -2)
	    end
	end
	if '???' == code then
	    W(spcd .. spcd .. 'Could not find response code. ' .. APT.lnk(URL), PU.scheme, sanity, host)
	end
    end
    os.execute('cat results/STATUS_' .. fname .. ' >> results/curl_HEAD_' .. fname .. '; rm -f results/STATUS_' .. fname .. ' 2>/dev/null')

    if ("4" == tostring(code):sub(1, 1)) or ("5" == tostring(code):sub(1, 1)) then
	E(spcd .. spcd .. code .. " " .. cstr .. ".   " .. check .. " " .. APT.lnk(URL), PU.scheme, sanity, host)
    else
	if not APT.testing(PU.scheme, host) then
	    I(spcd .. spcd .. "Not supported, but works " .. PU.scheme .. " " .. APT.lnk(URL), PU.scheme, "", host)
	end
	I(spcd .. spcd .. code .. " " .. cstr .. ".   " .. check .. " " .. APT.lnk(URL), host)
--	timeouts = timeouts - 1	-- Backoff the timeouts count if we managed to get through.
	if nil ~= location then
	    pu = url.parse(location, defaultURL)
	    if (pu.host == APT.options.roundRobin.value) and (nil ~= PU.path:find('merged/pool/DEVUAN/')) then
		E('DEVUAN packages must not be redirected to ' .. APT.options.roundRobin.value .. ' - ' .. APT.lnk(URL) .. arw .. APT.lnk(location), PU.scheme, 'Redirects', host)
	    end
	    if APT.testing("Protocol") then
		if ('http' == location:sub(1, 4)) and (pu.scheme ~= PU.scheme) then	-- Sometimes a location sans scheme is returned, this is not a protocol change.
		    if APT.options.roundRobin.value == host then  -- Coz HTTPS shouldn't happen via the round robin.
			E(spcd .. spcd .. "Protocol changed during redirect!  " .. check .. " " .. APT.lnk(URL) .. arw .. APT.lnk(location), PU.scheme, "Protocol", host)
		    end
			W(spcd .. spcd .. "Protocol changed during redirect!  " .. check .. " " .. APT.lnk(URL) .. arw .. APT.lnk(location), PU.scheme, "Protocol", host)
		    else
		end
		APT.tested(PU.scheme, 'Protocol', host)
	    end

	    if location == URL then
		E(spcd .. spcd .. "Redirect loop!  " .. check .. " " .. APT.lnk(URL) .. arw .. APT.lnk(location), PU.scheme, "", host)
	    elseif nil == pu.host then
		I(spcd .. spcd .. "Relative redirect.  " .. check .. " " .. APT.lnk(URL) .. arw .. APT.lnk(location), host)
		if 1 <= APT.options.bandwidth.value then checkHEAD(host, PU.scheme .. "://" .. PU.host .. location, r + 1, retry, '' ~= sanity) end
	    elseif (PU.host == pu.host) or (host == pu.host) then
		if PU.host ~= host then
		    local t = pu.host
		    pu.host = PU.host
		    location = url.build(pu)
		    pu.host = t
		end
		I(spcd .. spcd .. "Redirect to same host.  " .. check .. " " .. APT.lnk(URL) .. arw .. APT.lnk(location), host)
		if 1 <= APT.options.bandwidth.value then checkHEAD(host, location, r + 1, retry, '' ~= sanity) end
	    else
		I(spcd .. spcd .. "Redirect to different host.  " .. check .. " " .. APT.lnk(URL) .. arw .. APT.lnk(location), host)
		if 1 <= APT.options.bandwidth.value then 
		    --[[ The hard part here is that we end up throwing ALL of the test files at the redirected location.
		        Not good for deb.debian.org, which we should only be throwing .debs at.
		        What we do is loop through the DNS entries, and only test the specific protocol & file being tested here.
		    ]]
		    local u = pu.host .. "/" .. pu.path
		    local file = pu.path:match(".*/([%w%.%+%-_]*)$")	-- Get the filename.
		    local path = pu.path:sub(2, -1 -(#file))
		    local check = u:gsub("/", "_")
		    local extraArgs = sendArgs .. ' -o -r '
		    if 'https' == pu.scheme then extraArgs = extraArgs .. ' --tests=-http' end
		    if 'http'  == pu.scheme then extraArgs = extraArgs .. ' --tests=-https' end
		    local pth = path:match('^(.*/pool/).*$')
		    if nil ~= pth then table.insert(APT.results[PU.scheme].redirects, pu.host .. "/" .. pth) else E(spcd .. spcd .. 'Odd redirect path ' .. path) end
		    I(spcd .. spcd .. "Now checking redirected host " .. u .. ' &nbsp; for &nbsp; ' .. APT.lnk(URL) .. arw .. APT.lnk(location), host)
		    APT.exe(downloadLock .. "REDIR-" .. check .. ".log.txt" .. " ./apt-panopticon.lua " .. extraArgs .. ' ' .. pu.host .. "/" .. path .. " " .. file):timeout(APT.options.maxtime.value * 2.0):Nice():log():fork(pu.host)
		    D(spcd .. 'logging to ' .. APT.logName(pu.host, nil, file)[2])
		    APT.tested(PU.scheme, 'Redirects', host)
		end
	    end
	elseif nil ~= PU.path:find('merged/pool/DEBIAN-SECURITY/') then
	    W('DEBIAN-SECURITY packages must be redirected to a Debian mirror - ' .. APT.lnk(URL) .. arw .. APT.lnk(location), PU.scheme, 'Redirects', host)
	end
    end
end

local checkTimeouts = function(host, scheme, URL)
    totalTimeouts = totalTimeouts + timeouts; timeouts = 0
    checkHEAD(host, scheme .. "://" .. URL)
    if (1 <= APT.options.bandwidth.value) and APT.testing("URLSanity") then
	URL = URL:gsub("/", "///")
	URL = URL:gsub("///", "/", 1)
	checkHEAD(host, scheme .. "://" .. URL, 0, 0, true)
	APT.tested(scheme, 'URLSanity', host)
    end
    if nil ~= cor then
	D('*&gt;* About to resume coroutine after checkHEAD(' .. host .. ' , ' .. scheme .. ' :// ' .. URL .. ')')
	local ok, message = coroutine.resume(cor)
	if not ok then cor = nil; print(message) end
    end
    if APT.options.timeouts.value <= (totalTimeouts) then
	E("Way too many timeouts!", scheme, "URLSanity", host)
	return true
    end
    return false
end

local checkFiles = function (host, ip, path, file)
    timeouts = 0
    if nil == path then path = "" end
    if nil ~= file then
	if "redir" == ip then ip = host end
	if checkTimeouts(host, "http",  ip .. path .. "/" .. file) then return end
	if checkTimeouts(host, "https", ip .. path .. "/" .. file) then return end
    else
	I("  HEAD testing files for " .. host .. arw .. ip .. " " .. path, host)
	if 1 <= APT.options.bandwidth.value then
	    -- Do these first, coz they are likely to fork off a different server.
	    for i, s in pairs(referenceDebs) do
		if checkTimeouts(host, "http",  ip .. path .. "/" .. s) then return end
		if checkTimeouts(host, "https", ip .. path .. "/" .. s) then return end
	    end
	end
	for i, s in pairs(APT.releases) do
	    for j, k in pairs(releaseFiles) do
		if repoExists(s .. k) then
		    if checkTimeouts(host, "http",  ip .. path .. "/merged/dists/" .. s .. '/' .. k) then return end
		    if 1 <= APT.options.bandwidth.value then
			if checkTimeouts(host, "https", ip .. path .. "/merged/dists/" .. s .. '/' .. k) then return end
		    else
			break
		    end
		end
		if 2 >= APT.options.bandwidth.value then break end
	    end
	    if 2 >= APT.options.bandwidth.value then break end
	end
	if 1 <= APT.options.bandwidth.value then
	    for i, s in pairs(referenceDevs) do
		if checkTimeouts(host, "http",  ip .. path .. "/" .. s) then return end
		if checkTimeouts(host, "https", ip .. path .. "/" .. s) then return end
	    end
	end
    end
end

checkHost = function (orig, host, path, ip, file)
    if nil == host then host = orig end
    if nil == path then path = "" end
    if nil == file then file = "" end
    local ph = url.parse("http://" .. host)
    if (nil ~= ip) and ("redir" ~= ip) then
	local po = url.parse("http://" .. orig)
	if "" ~= file then
	    D("checking redirected file " .. po.host .. " " .. file)
	    checkFiles(po.host, ip, path, file)
	else
	    checkFiles(po.host, ip, path)
	end
    else
	if orig == host then
	    I("Testing mirror " .. orig .. "" .. file)
	    APT.exe("./apt-panopticon.lua " .. sendArgs .. " -o " .. orig .. path .. " " .. file):timeout(APT.options.maxtime.value * 2.0):Nice():log():fork(orig)
	    D('logging to ' .. APT.logName(ph.host, nil, file)[2])
	else D("checkHost " .. orig .. arw .. host) end
    end
end


local addDownload = function(host, URL, f, r, k)
    local file = k:match(".*/([%w%.%+%-_]*)$")	-- Get the filename.
    if APT.checkFile("results/" .. host .. "/merged/dists/" .. r .. '/' .. k) then
	-- Curls "check timestamp and overwrite file" stuff sucks.
	-- -R means the destination file gets the timestamp of the remote file.
	-- Can only do ONE timestamp check per command.
	--  This doesn't work either.  All downloads get all these headers.  Pffft
--	local status, ts = APT.execute('TZ="GMT" ls -l --time-style="+%a, %d %b %Y %T %Z"  results/' .. host .. "/merged/dists/" .. r .. '/' .. k .. ' | cut -d " " -f 6-11')
--	f:write('header "If-Modified-Since: ' .. ts:sub(2, -2) .. '"\n')
	-- Curl will DELETE the existing file if the timestamp fails to download a new one, unless we change directory first, 
	-- which wont work with multiple files in multiple directories.  WTF?
--TODO - change tactic, do a HEAD if-modified test first before adding the file to the list to download.
	os.execute(" mv   results/" .. host .. "/merged/dists/" .. r .. '/' .. k .. 
			" results/" .. host .. "/merged/dists/" .. r .. '/' .. k .. ".old")
    end

    D('Downloading http://' .. host .. URL .. '/merged/dists/' .. r .. '/' .. k)
    f:write('url "' .. 'http://' .. host .. URL .. '/merged/dists/' .. r .. '/' .. k .. '"\n')
    f:write('output "results/' .. host .. '/merged/dists/' .. r .. '/' .. k .. '"\n')
end

local postDownload = function(host, r, k)
    local file = k:match(".*/([%w%.%+%-_]*)$")	-- Get the filename.
    if nil == file then file = k end
    os.execute("if [ -f results/" .. host .. "/merged/dists/" .. r .. '/' .. k .. ".old ]" ..
	    " && [ ! -f results/" .. host .. "/merged/dists/" .. r .. '/' .. k .. " ]; then cp -a" ..
		    "   results/" .. host .. "/merged/dists/" .. r .. '/' .. k .. ".old" ..
		    "   results/" .. host .. "/merged/dists/" .. r .. '/' .. k .. "; fi")
    if APT.checkFile('results/' .. host .. '/merged/dists/' .. r .. '/' .. k) then
	if ".gz"  == k:sub(-3, -1) then APT.exe("gzip -dfk results/" .. host .. "/merged/dists/" .. r .. '/' .. k):Nice():noErr():Do() end
	if ".xz"  == k:sub(-3, -1) then APT.exe("xz   -dfk results/" .. host .. "/merged/dists/" .. r .. '/' .. k):Nice():noErr():Do() end
    end
end

local download = "curl" ..
		 " --connect-timeout " .. APT.options.timeout.value ..
		 " --create-dirs -f -L" ..
		 " --fail-early" ..
		 " --max-time " .. APT.options.maxtime.value ..
		 APT.IPv46 .. ' ' ..
		 " --retry " .. APT.options.retries.value ..
		 " -R -v -z 'results/stamp.old'  --stderr results/"
local downloads = function(host, URL, meta, release, list)
    if nil == URL then URL = "" end
    local files = 'curl-' .. meta .. '-' .. host .. '.files.txt'
    local lock = meta .. "-" .. host .. ".log.txt"
    local log = "curl-" .. meta .. "-" .. host .. ".log.txt"
    local cm = downloadLock .. lock .. " " .. download .. log .. " -K results/" .. files
    if      APT.testing("IPv4")  and (not APT.testing("IPv6")) then cm = cm .. ' -4' end
    if (not APT.testing("IPv4")) and      APT.testing("IPv6")  then cm = cm .. ' -6' end
    f, e = io.open("results/curl-" .. meta .. '-' .. host .. ".files.txt", "a+")
    if nil == f then C("opening curl downloads list file - " .. e); return end

    if nil ~= list then
	if "" ~= list then
	    if nil ~= release then
		for l in list:gmatch("\n*([^\n]+)\n*") do
		    addDownload(host, URL, f, release, "/" .. l)
		end
	    else
		I('Downloading ' .. APT.lnk('http://' .. host .. URL .. '/merged/' .. list))
		f:write('url "' .. 'http://' .. host .. URL .. '/merged/' .. list .. '"\n')
		f:write('output "results/' .. host .. '/merged/' .. list .. '"\n')
	    end
	    f:close()
	    return
	end
    else
	for i, s in pairs(APT.releases) do
	    for j, k in pairs(releaseFiles) do
		if repoExists(s .. k) then
		    addDownload(host, URL, f, s, k)
		end
	    end
	end
    end
    f:close()
    APT.exe(cm):timeout(APT.options.maxtime.value * 2.0):Nice():log():fork(host)
    D('logging to <a href="' .. log .. '">' .. log .. '</a>, with <a href="' .. files .. '">these files</a>')
end


local validateURL = function(m)
    if " " == m.BaseURL:sub(-1, -1) then
	W("space at end of BaseURL in mirror_list.txt!  " .. m.BaseURL, "", "", m.FQDN)
	m.BaseURL = m.BaseURL:sub(1, -2)
    end
    if "/" == m.BaseURL:sub(-1, -1) then
	W("slash at end of BaseURL in mirror_list.txt!  " .. m.BaseURL, "", "", m.FQDN)
	m.BaseURL = m.BaseURL:sub(1, -2)
    end
    local p = url.parse("http://" .. m.BaseURL)
    if nil == p.path then p.path = '' end
    if nil ~= p.port then p.authority = authority .. ':' .. p.port end
    if nil == m.FQDN then W("Something wrong in FQDN from mirror_list.txt!  nil", "", "", p.authority) else
	if m.FQDN ~= p.authority then W("Something wrong in FDQN from mirror_list.txt!  " .. m.FDQN, "", "", p.authority) end
    end
    if nil == m.BaseURL then W("Something wrong in BaseURL from mirror_list.txt!  nil", "", "", p.authority) else
	if m.BaseURL ~= (p.authority .. p.path) then W("Something wrong in BaseURL from mirror_list.txt!  " .. m.BaseURL, "", "", p.authority) end
    end
    if (nil ~= p.query) or (nil ~= p.fragment) or (nil ~= p.params) then W("Something wrong in BaseURL from mirror_list.txt, should be nothing after the path!  " .. m.BaseURL, "", "", p.authority) end
    if (nil ~= p.user) or (nil ~= p.userinfo) or (nil ~= p.password) then W("Something wrong in BaseURL from mirror_list.txt, should be no credentials!  " .. m.BaseURL, "", "", p.authority) end
    m.FQDN = p.authority
    m.BaseURL = p.authority .. p.path
    return m
end

local getMirrors = function ()
    local mirrors = {}
    local host = ""
    local m = {}
    local active = true
    local URL = 'http://' .. APT.options.referenceSite.value .. '/mirror_list.txt'
    I('Downloading and parsing http://' .. APT.options.referenceSite.value .. '/mirror_list.txt')
    local p, c, h = http.request(URL)
    if nil == p then E(c .. " fetching " .. URL) else

	for l in p:gmatch("\n*([^\n]+)\n*") do
	    local t, d = l:match("(%a*):%s*(.*)")
	    d = string.lower(d)
	    if "FQDN" == t then
		if "" ~= host then
		    mirrors[host] = validateURL(m)
		    m = {}
		    active = true
		end
		host = d
		m[t] = d
	    elseif "Protocols" == t then
		local prot = {}
		for w in d:gmatch("(%w+)") do
		    if APT.search(APT.protocols, w:lower()) then prot[w] = true end
		end
		m[t] = prot
	    elseif "Active" == t and nil == d:sub(1, 3):find("yes", 1, true) then
		W("Mirror " .. host .. " is not active - " .. d, "", "", host)
		active = false
		m[t] = d
-- TODO - Should do some more input validation on everything.
	    elseif "Rate" == t then
		local time, unit = d:match('(%d+) *(%a+)')
		time = tonumber(time)
		unit = unit:sub(1, 1)
		m[t] = time .. ' ' .. unit
		if     'm' == unit then
		    time = time * 60
		elseif 'h' == unit then
		    time = time * 60 * 60
		else
		    C('Unknown Rate for mirror ' .. host)
		end
		m['Updated'] = time
	    else
		m[t] = d
	    end
	end
	if "" ~= host --[[and active]] then
	    mirrors[host] = validateURL(m)
	end
    end
    if APT.testing("DNSRR") then
	mirrors[APT.options.roundRobin.value] = { ["Protocols"] = { ["http"] = true; }; ['Updated'] = 300; ['DNSRR'] = false;
						  ["FQDN"] = APT.options.roundRobin.value; ["Active"] = 'yes'; ["BaseURL"] = APT.options.roundRobin.value; }
    end
    local file, e = io.open("results/mirrors.lua", "w+")
    if nil == file then C("opening mirrors file - " .. e) else
	file:write(APT.dumpTable(mirrors, "mirrors") .. "\nreturn mirrors\n")
        file:close()
    end
    if 42 < #mirrors then print(#mirrors .. ' is too many mirrors!') ; os.exit(false) end
    return mirrors
end


local postParse = function(host, list)
    if APT.options.referenceSite.value == host then
	if nil ~= list then
	    local sem = 'results/NEW_' .. list.out .. '_%s.txt'
	    for i, n in pairs(APT.releases) do
		local f = sem:format(n)
		if APT.checkFile(f .. '.tmp') then
		    os.execute('mv ' .. f .. '.tmp ' .. f)
		else
		    os.execute('touch ' .. f)
		end
	    end
	end
    end
end

local parseDebs = function(host)
    for i, n in pairs(APT.releases) do
	local inFile =  'results/NEW_debs_' .. n .. '.txt'
	local nfile, e = io.open(inFile, "r")
	    if nil == nfile then W("opening " .. inFile .. " file - " .. e) else
	    for l in nfile:lines() do
		local v, p, sz, sha = l:match(' | (.+) | (pool/.+%.deb) | (%d.+) | (%x.+) |')
		if nil ~= p then
		    if APT.checkFile('results/' .. host .. "/merged/" .. p) then
			local fsz = APT.exe('ls -l results/' .. host .. "/merged/" .. p .. ' | cut -d " " -f 5-5'):Do().result
			if APT.testing("Integrity") then
			    if sz ~= fsz:sub(2, -2) then	-- The sub bit is to slice off the EOLs at each end.
				E('Package size mismatch - results/' .. host .. "/merged/" .. p .. ' should be ' .. sz .. ', but is ' .. fsz:sub(2, -2) .. '.', 'http', 'Integrity', host)
			    else
				local fsha = APT.exe('sha256sum results/' .. host .. "/merged/" .. p .. ' | cut -d " " -f 1'):log():Do().result
				if sha ~= fsha:sub(2, -2) then E('Package SHA256 sum mismatch - results/' .. host .. "/merged/" .. p, 'http', 'Integrity', host) end
-- TODO - maybe check the PGP key, though packages are mostly not signed.
			    end
			    APT.tested('http', 'Integrity', host)
			end
			if APT.testing("Updated") then
			    if sz ~= fsz:sub(2, -2) then
				E('Package size mismatch for ' .. host .. "/merged/" .. p, 'http', 'Updated', host)
			    end
			    APT.tested('http', 'Updated', host)
			end
			os.execute('rm -f results/' .. host .. "/merged/" .. p)
		    else
			if Updating then
			    W('Not yet able to download, awaiting update for ' .. host .. "/merged/" .. p, 'http', 'Updated', host)
			else
			    E('Failed to download ' .. host .. "/merged/" .. p, 'http', 'Updated', host)
			end
		    end
		end
	    end
	end
    end
    return nil
end

local parsePackages = function(host)
    local list = {inf = 'Packages', parser = parseDebs, out = 'debs', files = {}, nextf = ''}
    for i, n in pairs(APT.releases) do
	local inFile =  'results/NEW_' .. list.inf  .. '_' .. n .. '.txt'
	local outFile = 'results/NEW_' .. list.out .. '_' .. n .. '.txt'
	if APT.options.referenceSite.value == host then
	    outFile = outFile .. '.tmp'
	end
	local dFile, e = io.open(inFile, "r")
	if nil == dFile then W("opening " .. inFile .. " file - " .. e) else
	    for l in dFile:lines() do
		postDownload(host, n, l)

		l = '/' .. l
		local file = l:match(".*/([%w%.%+%-_]*)$")	-- Get the filename.
		local dir  = l:sub(1, 0 - (#file + 1))

		if "Packages." == file:sub(1, 9) then
-- TODO - compare the SHA256 sums in pkgmaster's Release for both the packed and unpacked versions.
--        Also note that this might get only a partial download due to maxtime.
		    if APT.options.referenceSite.value == host then
			local Pp, e = io.open('results/' .. host .. '/merged/dists/'.. n .. dir .. 'Packages.parsed', "w+")
			if nil == Pp then W('opening results/' .. host .. '/merged/dists/'.. n .. dir .. 'Packages.parsed' .. ' file - ' .. e) else
			    local pp = {}
-- TODO - FIX - check if this file exists first.
			    for l in io.lines('results/' .. host .. '/merged/dists/'.. n .. dir .. 'Packages') do
				if "Package: "	== l:sub(1, 9) then
				    if 0 ~= #pp then
					for i = 1, 5 do
					    if nil == pp[i] then print(host .. " " .. n .. " " .. dir .. " " ..  i) else Pp:write(pp[i] .. " | ") end
					end
					Pp:write("\n")
				    end
				    pp = {}
				    pp[1] = 	   l:sub(10, -1)
				elseif "Version: "	== l:sub(1, 9) then
				    pp[2] = 	   l:sub(10, -1)
				elseif "Filename: "	== l:sub(1, 10) then
				    pp[3] = 	   l:sub(11, -1)
				elseif "Size: "	== l:sub(1, 6) then
				    pp[4] = 	   l:sub(7, -1)
				elseif "SHA256: "	== l:sub(1, 8) then
				    pp[5] = 	   l:sub(9, -1)
				end
			    end
			    Pp:close()
			    os.execute('sort results/' .. host .. '/merged/dists/'.. n .. dir .. 'Packages.parsed >results/' .. host .. '/merged/dists/'.. n .. dir .. 'Packages_parsed-sorted')
			    if APT.checkFile('Packages/' .. n .. dir .. 'Packages_parsed-sorted') then
				os.execute('diff -U 0    Packages/' .. n .. dir .. 'Packages_parsed-sorted ' ..
							'results/' .. APT.options.referenceSite.value .. '/merged/dists/' .. n .. dir .. 'Packages_parsed-sorted ' ..
							' | grep -E "^-" | grep -Ev "^\\+\\+\\+|^---" >>results/OLD_' .. list.out  .. '_' .. n .. '.txt')
				os.execute('diff -U 0    Packages/' .. n .. dir .. 'Packages_parsed-sorted ' ..
							'results/' .. APT.options.referenceSite.value .. '/merged/dists/' .. n .. dir .. 'Packages_parsed-sorted ' ..
							' | grep -E "^\\+" | grep -Ev "^\\+\\+\\+|^---" >>results/NEW_' .. list.out  .. '_TMP_' .. n .. '.txt')
				for i, s in pairs(referenceDebs) do
				    if 0 == APT.exe('grep -q "' .. s:sub(8, -1) .. '" results/OLD_' .. list.out  .. '_' .. n .. '.txt'):log():Do().status then
					print('Reference package is out of date from ' .. host .. ' (' .. n .. ') - ' .. s)
				    end
				end
				for i, s in pairs(referenceDevs) do
				    if 0 == APT.exe('grep -q "' .. s:sub(8, -1) .. '" results/OLD_' .. list.out  .. '_' .. n .. '.txt'):log():Do().status then
					print('Reference package is out of date from ' .. host .. ' (' .. n .. ') - ' .. s)
				    end
				end
			    else
				W("Can't find file Packages/" .. n .. dir .. "Packages_parsed-sorted")
			    end
			    os.execute('mkdir -p Packages/' .. n .. dir)
			    os.execute('mv -f results/' .. APT.options.referenceSite.value .. '/merged/dists/' .. n .. dir .. 'Packages_parsed-sorted Packages/' .. n .. dir .. 'Packages_parsed-sorted')
			end
		    else
		    end
		    os.execute('rm -fr results/' .. host .. '/merged/dists/' .. n .. dir .. ' 2>/dev/null')
		end
	    end

	    if APT.checkFile('results/NEW_' .. list.out  .. '_TMP_' .. n .. '.txt') then
		-- Sort by size.
		os.execute('sort -b -k 9,9 -n results/NEW_' .. list.out  .. '_TMP_' .. n .. '.txt >results/NEW_' .. list.out  .. '_' .. n .. '.sorted.txt')
		os.execute('grep -s " | pool/DEVUAN/"          results/NEW_' .. list.out  .. '_' .. n .. '.sorted.txt 2>/dev/null | head -n 1 >>' .. outFile)
		os.execute('grep -s " | pool/DEBIAN-SECURITY/" results/NEW_' .. list.out  .. '_' .. n .. '.sorted.txt 2>/dev/null | head -n 1 >>' .. outFile)
		os.execute('grep -s " | pool/DEBIAN/"          results/NEW_' .. list.out  .. '_' .. n .. '.sorted.txt 2>/dev/null | head -n 1  >' .. outFile)
		os.execute('rm -f results/NEW_' .. list.out  .. '_TMP_' .. n .. '.txt')
	    end

	end

	local nfile, e = io.open(outFile, "r")
	if nil ~= nfile then
--	    for l in nfile:lines() do
		local l = nfile:read('*l')
		if nil ~= l then
		    local p = l:match('(pool/.*%.deb)')
		    if nil ~= p then
			table.insert(list.files, p)
		    end
		end
--	    end
	end
    end

    postParse(host, list)
    return list
end

local parseRelease = function(host)
    local list = {inf = 'Release', parser = parsePackages, out = 'Packages', files = {}, nextf = 'debs'}
    local updated = false
    local now = tonumber(os.date('%s'))
    for i, n in pairs(APT.releases) do
	for l, o in pairs(releaseFiles) do
	    if repoExists(i .. o) then
		postDownload(host, n, o)
		if (".gpg" == o:sub(-4, -1)) and (APT.checkFile('results/' .. host .. '/merged/dists/' .. n .. '/' .. o)) then
		    if APT.testing("Integrity") then
			local status = APT.exe( "gpgv --keyring " .. keyring .. " results/" .. host .. "/merged/dists/" .. n .. '/' .. o .. 
						" results/" .. host .. "/merged/dists/" .. n .. '/' .. o:sub(1, -5)):Nice():noErr():log():Do().status
			if 0 ~= status then E("GPG check failed for " .. host .. "/merged/dists/" .. n .. '/' .. o, "http", "Integrity", host) end
-- TODO - should check the PGP sig of InRelease as well.
			APT.tested('http', 'Integrity', host)
		    end
		    os.execute('rm results/' .. host .. '/merged/dists/' .. n .. '/' .. o)
		end
	    end
	end

	local fR  = 'results/' .. host .. '/merged/dists/' .. n .. '/Release'
	local fRp = APT.options.referenceSite.value .. '/merged/dists/' .. n .. '/Release.SORTED'
	if  APT.checkFile(fR) then
	    os.execute('sort -k 3 ' .. fR .. ' >' .. fR .. '.SORTED')
	    local outFile = 'results/NEW_' .. list.out .. '_' .. n .. '.txt'
	    if APT.checkFile('results_old/' .. fRp) then
		if APT.options.referenceSite.value == host then
		    outFile = outFile .. '.tmp'
		    os.execute('diff -U 0    results_old/' .. fRp .. ' ' ..
					    'results/' .. fRp .. ' ' ..
					    '| grep -v "@@" | grep "^+" | grep "Packages.xz$" |  cut -c 77- >' .. outFile)
-- TODO - Maybe check the date in Release, though since they are updated daily, is there any point?  Perhaps it's for checking amprolla got run?
--	Also check if that date is in the future, apt recently got a check for that, though not sure why.
		    os.execute('rm -f ' .. fR .. ' 2>/dev/null; ')
		else
-- TODO - compare to the pkgmaster copy.
		    if APT.testing('Updated') then
			while not APT.checkFile('results_old/' .. fRp) do
			    D('*&lt;* About to yield coroutine while waiting on - not APT.checkFile(results_old/' .. fRp .. ')')
			    coroutine.yield()
			    D('*&gt;* Resumed coroutine while waiting on - not APT.checkFile(results_old/' .. fRp .. ')')
			end
			local pkt = tonumber(APT.exe([[TZ="GMT" date -d "$(grep '^Date:' results/]] .. fRp .. [[  | cut -d ' ' -f 2-)" '+%s']]):Do().result:sub(2, -2))
			local new = tonumber(APT.exe([[TZ="GMT" date -d "$(grep '^Date:' ]]  ..  fR  .. [[.SORTED | cut -d ' ' -f 2-)" '+%s']]):Do().result:sub(2, -2))
			local upd  = pkt +  APT.mirrors[host].Updated
			local updd = pkt + (APT.mirrors[host].Updated * 1.5)	-- Give the mirror time to actually do the update.
			if pkt > new then
			    D( 'pkt is ' .. os.date('!%F %T', pkt) .. ' new is ' .. os.date('!%F %T', new) ..
			      ' upd is ' .. os.date('!%F %T', upd) .. ' updd is ' .. os.date('!%F %T', updd) ..
			      ' now is ' .. os.date('!%F %T', now) .. ' Updated is ' .. APT.mirrors[host].Updated)
			    if updd >= now then
				W('Release ' .. n .. ' not updated yet, should update @ ' .. os.date('!%F %T', upd) .. ', and was last updated @ ' .. os.date('!%F %T', new), 'http', 'Updated', host)
				Updating = true
			    else
				E('Release ' .. n .. ' not updated, should have updated @ ' .. os.date('!%F %T', upd) .. ', but was last updated @ ' .. os.date('!%F %T', new), 'http', 'Updated', host)
			    end
			    updated = false
			else
			    updated = true
			end
			APT.tested('http', 'Updated', host)
		    end
		end

-- TODO - if it's not Integrity and not reference, then just do a HEAD check and compare file times?
-- TODO - like we do with debs, pick just the smallest Packages.xz that has changed.
--	    Though we are sorting Release by name, so we can do the diff with the one from results_old, so we'll need to sort by size to.
--	    pkgmaster still needs to download all the changed Packages.xz files though.
		if (2 <= APT.options.bandwidth.value) and (updated or APT.testing("Integrity") or (APT.options.referenceSite.value == host)) then
		    local dfile, e = io.open(outFile, "r")
		    if nil == dfile then W("opening " .. outFile .. " file - " .. e) else
			for l in dfile:lines() do
			    table.insert(list.files, 'dists/' .. n .. '/' .. l)
			end
		    end
		end
	    end
	end

    end
    postParse(host, list)
    return list
end

local parseStart = function(host)
    local list = {inf = '', parser = parseRelease, out = 'Release', files = {}, nextf = 'Packages'}
    for i, n in pairs(APT.releases) do
	local outFile = 'results/NEW_' .. list.out .. '_' .. n .. '.txt'
	for l, o in pairs(releaseFiles) do
	    if repoExists(n .. o) then
		if APT.options.referenceSite.value == host then
		    local dfile, e = io.open(outFile .. '.tmp', "a+")
		    if nil == dfile then W("opening " .. outFile .. ".tmp file - " .. e) else
			dfile:write(o .. '\n')
		    end
		end
		table.insert(list.files, 'dists/' .. n .. '/' .. o)
	    end
	end
    end
    postParse(host, list)
    return list
end

local doDownloads = function(host, path, list)
    while nil ~= list do
	if 0 ~= #(list.files) then
	    for j, f in pairs(list.files) do
		downloads(host, path, list.out, nil, f)
	    end
	    downloads(host, path, list.out, nil, '')
--[[ I've seen flock & curl act oddly.  Perhaps flock didn't have time to start up?
    /var/www/html/apt-panopticon/apt-panopticon/results_2019-12-22-15-00

Mon Dec 23 01:02:54 2019 DEBUG : forking

flock -n results/curl-debs-pkgmaster.devuan.org.log curl --connect-timeout 5 --create-dirs -f -L --fail-early --max-time 300 --retry 3 -R -v -z 'results/stamp.old'  --stderr results/curl-debs-pkgmaster.devuan.org.log -K results/curl-debs-pkgmaster.devuan.org.files


Mon Dec 23 01:02:54 2019 DEBUG : 0 flock -n results/curl-debs-pkgmaster.devuan.org.log commands still running.
Mon Dec 23 01:02:54 2019 DEBUG : *>* Resumed coroutine NO LONGER waiting on - 0 < APT.checkExes(flock -n results/curl-debs-pkgmaster.devuan.org.log
Mon Dec 23 01:02:54 2019 DEBUG : *** Doing list.parser() for debs
Mon Dec 23 01:02:54 2019 ERROR (http Updated pkgmaster.devuan.org): Failed to download - results/pkgmaster.devuan.org/merged/pool/DEBIAN/main/a/aptly/aptly_1.3.0+ds1-4_amd64.deb

drwxr-x--- 2 www-data www-data 4096 2019-12-23 01:02:57.000000000 +1000 aptly
-rw-r--r-- 1 www-data www-data  7129 2019-12-23 01:03:54.000000000 +1000 curl-debs-pkgmaster.devuan.org.log

]]
os.execute('sleep 1')	-- Wait for things to start up before checking for them.
	    while 0 < APT.checkExes(downloadLock .. list.out .. "-" .. host .. ".log.txt") do
		D('*&lt;* About to yield coroutine while waiting on - 0 < APT.checkExes(' .. downloadLock .. list.out .. '-' .. host .. '.log.txt')
		coroutine.yield()
		D('*&gt;* Resumed coroutine while waiting on - 0 < APT.checkExes(' .. downloadLock .. list.out .. '-' .. host .. '.log.txt')
	    end
	    D('*&gt;* Resumed coroutine NO LONGER waiting on - 0 < APT.checkExes(' .. downloadLock .. list.out .. '-' .. host .. '.log.txt')

	    local f = 'results/curl-' .. list.out .. "-" .. host .. ".log.txt"

	    local f = 'results/curl-' .. list.out .. "-" .. host .. ".log.txt"
	    -- Should not be needed, but maybe this is why sometimes I don't see the speeds, though the file is there aand valid when I look later.
	    while not APT.checkFile(f) do
		D('*&lt;* About to yield coroutine while waiting on - not APT.checkFile(' .. f .. ')')
		coroutine.yield()
		D('*&gt;* Resumed coroutine while waiting on - not APT.checkFile(' .. f .. ')')
	    end

--[[ TODO - should try to figure out which server the file actually got downloaded from, and attribute the speed and errors to that server.
	    Which means parsing the curl logs, not just a simple match().
	    Watch out for misplaced ^M, they don't all come at the end of the line.
	    Also note curl-Release-mirror.devuan.de.log.txt, timeouts don't always show the "Connected to" string.
	    * Immediate connect fail for 2001:4ca0:4300::1:19: Network is unreachable
	    * Connected to debian.ipacct.com (2a01:9e40::251) port 80 (#1)
	      0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0* Connected to devuan.bio.lmu.de (141.84.43.19) port 80 (#0)
	    curl: (22) The requested URL returned error: 404 Not Found
]]
	    local trace = {}
	    local min, max, spd = 999999999999, 0
	    local num = '[%d%.]+[kM]?'
	    if APT.checkFile(f) then
		for l in io.lines(f) do
		    local speed, crrnt = l:match('^%c *'..num..' +'..num..' +%d+ +'..num..' +%d+ +%d+ +('..num..') +%d+ +[%d%-]+:[%d%-]+:[%d%-]+ +[%d%-]+:[%d%-]+:[%d%-]+ +[%d%-]+:[%d%-]+:[%d%-]+ +('..num..')')
		    if nil ~= speed then
			if 'k' == speed:sub(-1, -1)         then speed = tonumber(speed:sub(1, -2)) * 1024
			    elseif 'M' == speed:sub(-1, -1) then speed = tonumber(speed:sub(1, -2)) * 1024 * 1024
			end
			speed = tonumber(speed)
			if 'k' == crrnt:sub(-1, -1)         then crrnt = tonumber(crrnt:sub(1, -2)) * 1024
			    elseif 'M' == crrnt:sub(-1, -1) then crrnt = tonumber(crrnt:sub(1, -2)) * 1024 * 1024
			end
			crrnt = tonumber(crrnt)
			if speed < min and speed ~= 0 then min = speed end
			if speed > max                then max = speed end
			if crrnt < min and crrnt ~= 0 then min = crrnt end
			if crrnt > max                then max = crrnt end
		    end
		    if l:find('timed out') ~= nil then
			E("  TIMEOUT " .. timeouts + 1 .. ', details in <a href="curl-' .. list.out .. '-' .. host .. '.log.txt">curl-' .. list.out .. '-' .. host .. '.log.txt</a>', 'http', '', host)
			timeouts = timeouts + 1
			APT.results["timeout"] = true
		    end
		end
	    end
	    APT.results["speed"] = {["min"] = min, ["max"] = max}
	end

	if (APT.options.referenceSite.value ~= host) and ('' ~= list.nextf) then
	    local sem = 'results/NEW_' .. list.nextf .. '_%s.txt'
	    for i, n in pairs(APT.releases) do
		local f = sem:format(n)
		while not APT.checkFile(f) do
		    D('*&lt;* About to yield coroutine while waiting on - not APT.checkFile(' .. f .. ')')
		    coroutine.yield()
		    D('*&gt;* Resumed coroutine while waiting on - not APT.checkFile(' .. f .. ')')
		end
	    end
	end
	D('*** Doing list.parser() for ' .. list.out)
	list = list.parser(host)
	if APT.options.timeouts.value <= (totalTimeouts) then break end
    end
    D('*&lt;&lt;* About to end coroutine.')
    cor = nil
end


if 0 < #arg then
    if "/" == arg[1]:sub(-1, -1) then
	W("slash at end of path!  " .. arg[1])
	arg[1] = arg[1]:sub(1, -2)
    end
    if " " == arg[1]:sub(-1, -1) then
	W("space at end of path!  " .. arg[1])
	arg[1] = arg[1]:sub(1, -2)
    end
    local pu = url.parse("http://" .. arg[1])

    if APT.redir and (nil == arg[3])then
	arg[3] = arg[2]
	arg[2] = nil
    end

    if APT.testing("Integrity") or APT.testing("Updated") then
	if APT.origin and APT.options.referenceSite.value == pu.host then
--	    if not APT.keep then os.execute("rm -fr results/" .. pu.host .. " 2>/dev/null") end
	end
    end

    if not APT.logOpen(pu.host, arg[2], arg[3]) then return end
    I("Starting tests for " .. arg[1] .. " with these tests - " .. table.concat(APT.options.tests.value, ", "))
    APT.mirrors = loadfile("results/mirrors.lua")()
    APT.results = APT.padResults(APT.results)
    if APT.origin or APT.redir then
	if "" == pu.host then
	    print("Empty pu.host name! " .. pu.host)
	end
	APT.results["IPs"] = gatherIPs(pu.host)
    end
    if nil ~= arg[2] then I(" &nbsp; Using IP " .. arg[2]); ip = arg[2] end
    if nil ~= arg[3] then I(" &nbsp; Using file " .. arg[3]); end

    if APT.origin then
	local file = arg[3]
	if nil == file then file = '' end
	local path = pu.path
	if nil == path then path = '' end
	if APT.origin then
	    local ips = APT.results["IPs"]
	    if nil ~= ips then
		APT.allpairs(ips,
		    function(k, v)
			if v == "A" then
			    if APT.testing("IPv4") then APT.exe('./apt-panopticon.lua ' .. sendArgs .. ' -4 ' .. pu.host .. path .. ' ' .. k .. ' ' .. file):timeout(APT.options.maxtime.value * 2.0):Nice():log():fork(pu.host) end
			elseif v == "AAAA" then
			    if APT.testing("IPv6") then APT.exe('./apt-panopticon.lua ' .. sendArgs .. ' -6 ' .. APT.IPv46 .. ' ' .. pu.host .. path .. ' ' .. k .. ' ' .. file):timeout(APT.options.maxtime.value * 2.0):Nice():log():fork(pu.host) end
			end
			D('logging to ' .. APT.logName(pu.host, k, file)[2])
		    end
		)
	    else
		E("no IPs for " .. pu.host)
		APT.logPost()
		return
	    end
	end

	if not APT.redir then
	    if (1 <= APT.options.bandwidth.value) and (APT.testing("Integrity") or APT.testing("Updated")) then
		if APT.origin and (APT.options.roundRobin.value ~= pu.host) then
		    I("Starting file downloads for " .. pu.host)
		    D('*&gt;* About to create coroutine.')
		    cor = coroutine.create(doDownloads)
		    local ok, message = coroutine.resume(cor, pu.host, pu.path, parseStart(pu.host))
		    if not ok then cor = nil; print(message) end
		end
	    end
	    checkFiles(pu.host, pu.host, pu.path);
	else
	    checkFiles(pu.host, pu.host, pu.path:sub(1, -1), file);
	end
    else
	if "-6" == APT.IPv46 then arg[2] = '[' .. arg[2] .. ']' end
	checkHost(pu.host, pu.host, pu.path, arg[2], arg[3])
    end

    while nil ~= cor do
	os.execute('sleep 10')
	D('*&gt;* About to resume coroutine before writing results.')

	local ok, message = coroutine.resume(cor)
	if not ok then cor = nil; print(message); break end
    end

    local f = pu.host
    if "" ~= ip then f = f .. "_" .. ip end
-- TODO - perhaps number them if there's more than one?
    if APT.redir then f = f .. '_' .. 'R' end
    local rfile, e = io.open("results/" .. f .. ".lua", "w+")
    if nil == rfile then C("opening results file - " .. e) else
	rfile:write(APT.dumpTable(APT.results, "results") .. "\nreturn results\n")
        rfile:close()
    end

    if APT.origin and (not APT.redir) and (APT.options.referenceSite.value ~= pu.host) then
os.execute('sleep 1')	-- Wait for things to start up before checking for them.
	while 0 < APT.checkExes(downloadLock .. "Release-"  .. pu.host .. ".log.txt") do os.execute("sleep 10") end
	while 0 < APT.checkExes(downloadLock .. "Packages-" .. pu.host .. ".log.txt") do os.execute("sleep 10") end
	while 0 < APT.checkExes(downloadLock .. "package-"  .. pu.host .. ".log.txt") do os.execute("sleep 10") end
	os.execute("sleep 5")
	if not APT.keep then os.execute("rm -fr results/" .. pu.host .. " 2>/dev/null") end
    end

    APT.logPost()
else
    local adt = APT.exe("ls -dl results_old 2>/dev/null | cut -d '>' -f 2 | cut -d ' ' -f 2"):Do().result:sub(2, -2)
    if (nil ~= adt) and APT.checkFile(adt) then
	APT.exe('mkdir -p ' .. adt:sub(1, 18))
	:And():Nice('tar -c --xz ' .. adt .. ' -f ' .. adt:sub(1, 18) .. '/' .. adt .. '.tar.xz')
	:And('rm -fr ' .. adt):noErr():fork()
    end
    local dt = os.date('!%F-%H-%M')
    local odt = APT.exe('TZ="GMT" date -r results/stamp +%F-%H-%M 2>/dev/null'):Do().result:sub(2, -2)
    if nil ~= odt then os.execute('                               rm -f results_old; ln -s results_' .. odt .. ' results_old 2>/dev/null') end
    if nil ~= dt  then os.execute('mkdir -p results_' .. dt .. '; rm -f results;     ln -s results_' .. dt  .. ' results     2>/dev/null') end
    os.execute('if [ -f results/stamp ]; then mv results/stamp results/stamp.old; else touch results/stamp.old -t 199901010000; fi;  touch results/stamp')
    if not APT.keep then
	os.execute("rm -f results/*.html 2>/dev/null")
	os.execute("rm -f results/*.txt  2>/dev/null")
    end

    if not APT.logOpen('apt-panopticon') then return end
    I("Starting tests " .. table.concat(APT.options.tests.value, ", "))
    os.execute("mkdir -p results")
    APT.mirrors = getMirrors()
    checkHost(APT.options.referenceSite.value)

    for k, m in pairs(APT.mirrors) do
	local pu = url.parse("http://" .. m.BaseURL)
	if APT.options.referenceSite.value ~= pu.host then
	    checkHost(m.BaseURL)
	end
    end

    while not APT.checkFile('results/LOG_' .. APT.options.referenceSite.value .. '.html') do	-- Wait for things to start up before checking for them.
	D('Waiting for results/LOG_' .. APT.options.referenceSite.value .. '.html');
	os.execute("sleep 5")
-- TODO -  count these, and abort if it takes too long.
	-- Try something similar for the other "Wait for things to start up before checking for them.", maybe fold it into APT.exe.
    end
    while 1 <= APT.checkExes("apt-panopticon.lua " .. sendArgs) do os.execute("sleep 5") end

    local APT_args    = APT.args
    local debians = {}
    local srvs = APT.readCmd('ls -1 results/*.lua')
    for ii,l in ipairs(srvs) do
	local hst = l:sub(9, -5)
	if nil ~= l:find('_R%.lua') then hst = hst:sub(1, -3) end
	if (hst:find('_') == nil) and (nil == APT.mirrors[hst]) then
	    local ips = loadfile(l)().IPs
	    if nil ~= ips then
		debians[hst] = {Country = '', FQDN = hst, Active = 'yes', Rate = '', BaseURL = hst, Protocols = {http = true, https = true}, Bandwidth = '', IPs = ips}
		local baseFiles = {}
		local IPfiles = {}
		for i, a in pairs(ips) do
		    IPfiles[i] = {}
		    if type(a) == 'table' then
			for j, b in pairs(a) do
			    IPfiles[i][j] = {}
			end
		    end
		end
		local files = APT.readCmd('ls -1 results/LOG_' .. hst .. '_*.html')
		for iii,ll in ipairs(files) do
		    local dn = false
		    for i, a in pairs(ips) do
			if type(a) == 'table' then
			    for j, b in pairs(a) do
				if nil ~= ll:match('(results/LOG_' .. hst .. '_' .. j .. '_.*)') then
				    table.insert(IPfiles[i][j], ll)
				    dn = true
				end
			    end
			else
			    if nil ~= ll:match('(results/LOG_' .. hst .. '_' .. i .. '_.*)') then
				table.insert(IPfiles[i], ll)
				dn = true
			    end
			end
		    end
		    if not dn then table.insert(baseFiles, ll) end
		end

		local combine = function(ip, a)
		    local APT_logFile = APT.logFile
		    if not APT.logOpen(hst, ip) then
			print('PROBLEM OPENING LOG FILE ' .. hst .. ' ' .. ip) 
		    else
			APT.logFile:write('<h1>Note log lines will be out of order, this is a bunch of other log files combined.</h1>\n')
			for i, f in pairs(a) do
			    f = f:sub(9, -1)
			    APT.logFile:write('<hr>\n<hr>\n<h2><a href="' .. f .. '">' .. f .. '</a></h2>\n')
			    for ln in io.lines('results/' .. f) do
				if ln:match('^' .. os.date('!%Y%-%m%-%d ') .. '.*$') then APT.logFile:write(ln .. '\n') end	-- %F isn't good enough, coz we have to escape the '-'.
			    end
			end
			APT.logPost()
		    end
		    APT.args = APT_args
		    APT.logFile = APT_logFile
		end
		combine('', baseFiles)
		for ip, a in pairs(IPfiles) do
		    if nil == a[1] then
			for i, f in pairs(a) do
			    combine(i, f)
			end
		    else
			combine(ip, a)
		    end
		end

	    end
	end
    end
    local file, e = io.open("results/debians.lua", "w+")
    if nil == file then C("opening debians file - " .. e) else
	file:write(APT.dumpTable(debians, "debians") .. "\nreturn debians\n")
        file:close()
    end


    for k, v in pairs(APT.mirrors) do
	local f =  'results/' .. k .. '.lua'
	if APT.checkFile(f) then
	    results = loadfile(f)()
	    APT.mirrors[k]['IPs'] = results.IPs
	end
    end
    local file, e = io.open("results/mirrors.lua", "w+")
    if nil == file then C("opening mirrors file - " .. e) else
	file:write(APT.dumpTable(APT.mirrors, "mirrors") .. "\nreturn mirrors\n")
        file:close()
    end

    -- Create the reports.
    for n, r in pairs(APT.options.reports.value) do
	if APT.checkFile("apt-panopticon-report-" .. r .. ".lua") then
	    I("Creating " .. r .. " report.")
	    APT.exe("./apt-panopticon-report-" .. r .. ".lua " .. sendArgs):log():Do()
	end
    end

    I('Total run time was ' .. (os.time() - now) .. ' seconds.')
    APT.logPost()
end