With thanks to nordisch.org darix and MrWerewolf

I've been wrestling with a planned migration to lighttpd for a few days now, on the whole I've found it much easier than apache to configure something that works, and for the most part have done it much faster than the last time I had to configure Apache from scratch. The big sticking point was Drupal sites with an embedded gallery2.

I think I've cracked it using some rewrites and the magnet approach, I'm not sure if I've got the lua script right, actually, i'm pretty sure it's not matching the case I had to code some extra re-writes for. If anyone can spot where I've gone wrong I'll love them forever (or at least send them coffee).

Update: After feeding myself more coffee, I fixed it, see #typo below.

drupal.lua
[code type="lua"]
-- little helper function
function file_exists(path)
local attr = lighty.stat(path)
if (attr) then
return true
else
return false
end
end
function removePrefix(str, prefix)
return str:sub(1,#prefix+1) == prefix.."/" and str:sub(#prefix+2)
end

-- prefix without the trailing slash
local prefix = ''

-- the magic ;)
if (not file_exists(lighty.env["physical.path"])) then
-- file still missing. pass it to the fastcgi backend
request_uri = removePrefix(lighty.env["uri.path"], prefix)
-- rules for drupal
if request_uri then
local uriquery = lighty.env["uri.query"] or ""
if string.find(request_uri, "v/") == 1 then
lighty.env["uri.path"] = prefix .. "/index.php"
if #request_uri > 2 then
g2_path = string.sub(request_uri, 3)
else g2_path = ""
end
lighty.env["uri.query"] = uriquery .. (uriquery ~= "" and "&" or "") .. "q=gallery&g2_path=" .. g2_path
else lighty.env["uri.path"] = prefix .. "/index.php"
# end # typo
lighty.env["uri.query"] = uriquery .. (uriquery ~= "" and "&" or "") .. "q=" .. request_uri
end # fix for typo
lighty.env["physical.rel-path"] = lighty.env["uri.path"]
lighty.env["request.orig-uri"] = lighty.env["request.uri"]
lighty.env["physical.path"] = lighty.env["physical.doc-root"] .. lighty.env["physical.rel-path"]
end
end
-- fallthrough will put it back into the lighty request loop
-- that means we get the 304 handling for free. ;)
[/code]

My virtual host config

[code type="perl"]
$HTTP["host"] == "leedsrocksoc.co.uk" {
server.document-root = "/var/www/lighttpd/rocksoc/current"
# we only need index.php here.
index-file.names = ( "index.php" )
# for clean urls
magnet.attract-physical-path-to = ( "/etc/lighttpd/drupal.lua" )
# server.error-handler-404 = "/index.php?q=" #not needed
url.rewrite = (
"^/(.*)/Rewrite.txt$" => "/$1/Works.txt"
, "^/gallery2/v/(\?.+|\ .)?$" => "/gallery2/main.php?g2_view=core.ShowItem"
, "^/gallery2/admin[/?]*(.*)$" => "/gallery2/main.php?g2_view=core.SiteAdmin&$1"
, "^/gallery2/d/([0-9]+)-([0-9]+)/([^\/]+)(\?|\ )?(.*)$" => "/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=$1&g2_serialNumber=$2&$3"
, "^/gallery2/v/([^?]+)/slideshow.html" => "/gallery2/main.php?g2_view=slideshow.Slideshow&g2_path=$1"
, "^/gallery2/v/([^?]+)(\?|\ )?(.*)$" => "/gallery2/main.php?g2_view=core.ShowItem&g2_path=$1&$3"
, "^/gallery2/c/add/([0-9]+).html" => "/gallery2/main.php?g2_view=comment.AddComment&g2_itemId=$1"
, "^/gallery2/c/view/([0-9]+).html" => "/gallery2/main.php?g2_view=comment.ShowAllComments&g2_itemId=$1"
, "^/gallery2/p/(.+)" => "/gallery2/main.php?g2_controller=permalinks.Redirect&g2_filename=$1"
# For drupal + gallery2 embedded # not needed now typo fixed.
#, "^/v/(\?.+|\ .)?$" => "/index.php?q=gallery&g2_view=core.ShowItem"
#, "^/v/([^?]+)(\?|\ )?(.*)$" => "/index.php?q=gallery&g2_view=core.ShowItem&g2_path=$1&$3"
# may need some more but I've not found a broken one yet.
# where the url is "^/gallery2/char/whatever" => "/gallery2/main.php?somethingOrOther"
# add a rule for "^/char/whatever" => "/index.php?q=gallery&somethingOrOther"
)
}
[/code]