-- @@SHEBANG
-- -*- Lua -*-
-- gitano-pre-receive-hook
--
-- Git (with) Augmented network operations -- pre-receive hook handler
--
-- Copyright 2012 Daniel Silverstone <dsilvers@digital-scurf.org>
--
--

-- @@GITANO_LUA_PATH

local gitano = require "gitano"
local gall = require "gall"
local luxio = require "luxio"
local sio = require "luxio.simple"
local sp = require "luxio.subprocess"

-- @@GITANO_BIN_PATH
-- @@GITANO_SHARE_PATH

local start_log_level = gitano.log.get_level()
-- Clamp level at info until we have checked if the caller
-- is an admin or not
gitano.log.cap_level(gitano.log.level.INFO)
gitano.log.syslog.open()

local repo_root = luxio.getenv("GITANO_ROOT")
local username  = luxio.getenv("GITANO_USER") or "gitano/anonymous"
local keytag    = luxio.getenv("GITANO_KEYTAG") or "unknown"
local project   = luxio.getenv("GITANO_PROJECT") or ""
local source    = luxio.getenv("GITANO_SOURCE") or "ssh"

-- Now load the administration data
gitano.config.repo_path(repo_root)
local admin_repo = gall.repository.new((repo_root or "") .. "/gitano-admin.git")

if not admin_repo then
   gitano.log.fatal("Unable to locate administration repository.  Cannot continue");
end

local admin_head = admin_repo:get(admin_repo.HEAD)

if not admin_head then
   gitano.log.fatal("Unable to find the HEAD of the administration repository.  Cannot continue");
end

local config, msg = gitano.config.parse(admin_head)

if not config then
   gitano.log.critical("Unable to parse administration repository.")
   gitano.log.critical("  * " .. (msg or "No error?"))
   gitano.log.fatal("Cannot continue")
end

-- Now, are we an admin?
if config.groups["gitano-admin"].filtered_members[username] then
   -- Yep, so blithely reset logging level
   gitano.log.set_level(start_log_level)
end

if not config.global.silent then
   -- Not silent, bump to chatty level automatically
   gitano.log.bump_level(gitano.log.level.CHAT)
end

local repo, msg = gitano.repository.find(config, project)
if not repo then
   gitano.log.critical("Unable to locate repository.")
   gitano.log.critical("  * " .. (tostring(msg)))
   gitano.log.fatal("Cannot continue")
end
   
if repo.is_nascent then
   gitano.log.fatal("Repository " .. repo.name .. " is nascent")
end

-- pre-receive can prevent updates. Its name is a bit misleading.
-- pre-receive is called once all the objects have been pushed, but before the
-- individual update hooks are called.  It gets the same input as post-receive
-- but can opt to reject the entire push.  If you need to make decisions based
-- upon multiple refs being updated simultaneously, then this is the badger for
-- you.

local updates = {}
for oldsha, newsha, refname in
   (sio.stdin:read("*a")):gmatch("([^ ]+) ([^ ]+) ([^\n]+)") do
   gitano.log.ddebug("pre-receive:", oldsha, newsha, refname)
   updates[refname] = {oldsha, newsha, oldsha=oldsha, newsha=newsha}
end

if repo:uses_hook("pre-receive") then
   gitano.log.debug("Configuring for pre-receive hook")
   gitano.actions.set_supple_globals("pre-receive")

   local msg = "Running repository pre-receive hook"

   gitano.log.info(msg)
   gitano.log.syslog.info(msg)

   local info = {
      username = username,
      keytag = keytag,
      source = source,
      realname = (config.users[username] or {}).real_name or "",
      email = (config.users[username] or {}).email_address or "",
   }
   local ok, msg = gitano.supple.run_hook("pre-receive", repo, info, updates)
   if not ok then
      gitano.log.crit(msg or "No reason given, but errored somehow.")
   end
   gitano.log.info("Finished")
end

gitano.log.syslog.close()

return 0