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path: root/package/luarocks/0002-Buildroot-addon.patch
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From c250ac86b8633a2d53c4d10a642f2304e2b2d148 Mon Sep 17 00:00:00 2001
From: Francois Perrad <francois.perrad@gadz.org>
Date: Sat, 27 Oct 2018 17:15:50 +0200
Subject: [PATCH] Add a Buildroot addon

This addon allows to generate a Buildroot package from a Luarocks one.

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
---
 src/bin/luarocks                 |   1 +
 src/luarocks/addon/buildroot.lua | 326 +++++++++++++++++++++++++++++++
 2 files changed, 327 insertions(+)
 create mode 100644 src/luarocks/addon/buildroot.lua

diff --git a/src/bin/luarocks b/src/bin/luarocks
index d982530..53c7b0b 100755
--- a/src/bin/luarocks
+++ b/src/bin/luarocks
@@ -31,6 +31,7 @@ local commands = {
    config = "luarocks.cmd.config",
    which = "luarocks.cmd.which",
    test = "luarocks.cmd.test",
+   buildroot = "luarocks.addon.buildroot",
 }
 
 cmd.run_command(description, commands, "luarocks.cmd.external", ...)
diff --git a/src/luarocks/addon/buildroot.lua b/src/luarocks/addon/buildroot.lua
new file mode 100644
index 0000000..606b94c
--- /dev/null
+++ b/src/luarocks/addon/buildroot.lua
@@ -0,0 +1,326 @@
+
+--- Module implementing the LuaRocks "buildroot" command.
+local buildroot = {}
+
+local dir = require("luarocks.dir")
+local fs = require("luarocks.fs")
+local util = require("luarocks.util")
+local queries = require("luarocks.queries")
+local search = require("luarocks.search")
+local download = require("luarocks.download")
+local fetch = require("luarocks.fetch")
+
+buildroot.help_summary = "generate buildroot package files of a rock."
+buildroot.help_arguments = "rockname [brname]"
+buildroot.help = [[
+This addon generates Buildroot package files of a rock.
+First argument is the name of a rock, the second argument is optional
+and needed when Buildroot uses another name (usually prefixed by lua-).
+Files are generated with the source content of the rock and more
+especially the rockspec. So, the rock is downloaded and unpacked.
+]]
+
+local function brname (name)
+   return name:upper():gsub('-', '_')
+end
+
+local function brlicense (license)
+   if license:match('MIT/X') then
+      return 'MIT'
+   end
+   return license
+end
+
+local function wrap (txt, max)
+   local lines = {}
+   local line = ''
+   for word in txt:gmatch('(%S+)') do
+      if line:len() + word:len() > max - 1 then
+          lines[#lines+1] = line
+          line = ''
+      end
+      if line == '' then
+         line  = word
+      else
+         line = line .. ' ' .. word
+      end
+   end
+   lines[#lines+1] = line
+   return lines
+end
+
+local function get_external_dependencies (rockspec)
+   local t = {}
+   for k in pairs(rockspec.external_dependencies or {}) do
+      k = k:lower()
+      if fs.is_dir('package/' .. k) then
+         t[#t+1] = k
+      else
+         t[#t+1] = 'lib' .. k
+         if not fs.is_dir('package/lib' .. k) then
+            util.printout('unkwown external dependency: ' .. k)
+         end
+      end
+   end
+   table.sort(t)
+   return t
+end
+
+local function get_dependencies (rockspec)
+   local t = {}
+   for i = 1, #rockspec.dependencies do
+      local dep = tostring(rockspec.dependencies[i]):match('^(%S+)')
+      if dep ~= 'lua' then
+         dep = dep:gsub('_', '-')
+         if fs.is_dir('package/lua-' .. dep) then
+            t[#t+1] = 'lua-' .. dep
+         else
+            t[#t+1] = dep
+            if not fs.is_dir('package/' .. dep) then
+               util.printout('unkwown dependency: ' .. dep)
+            end
+         end
+      end
+   end
+   table.sort(t)
+   return t
+end
+
+function get_digest (file)
+   local absname = fs.absolute_name(file)
+   local pipe = io.popen('sha256sum ' .. fs.Q(absname))
+   local line = pipe:read('*l')
+   pipe:close()
+   local computed = line and line:match('(' .. ('%x'):rep(64) .. ')')
+   if computed then
+      return computed
+   else
+      return nil, "Failed to compute SHA256 hash for file " .. absname
+   end
+end
+
+local function generate_config (rockspec, lcname)
+   local ucname = brname(lcname)
+   local only_luajit = rockspec.package:match('^lj')
+   local summary = rockspec.description.summary
+   if not summary then
+      summary = '???'
+   elseif not summary:match('%.%s*$') then
+      summary = summary:gsub('%s*$', '.')
+   end
+   local homepage = rockspec.description.homepage or '???'
+   local external_dependencies = get_external_dependencies(rockspec)
+   local dependencies = get_dependencies(rockspec)
+   local fname = 'package/' .. lcname .. '/Config.in'
+   local f = assert(io.open(fname, 'w'))
+   util.printout('write ' .. fname)
+   f:write('config BR2_PACKAGE_' .. ucname .. '\n')
+   f:write('\tbool "' .. lcname .. '"\n')
+   if only_luajit then
+      f:write('\tdepends on BR2_PACKAGE_LUAJIT\n')
+   end
+   for i = 1, #external_dependencies do
+      f:write('\tselect BR2_PACKAGE_' .. brname(external_dependencies[i]) .. '\n')
+   end
+   for i = 1, #dependencies do
+      f:write('\tselect BR2_PACKAGE_' .. brname(dependencies[i]) .. ' # runtime\n')
+   end
+   f:write('\thelp\n')
+   f:write('\t  ' .. table.concat(wrap(summary, 62), '\n\t  ') .. '\n')
+   f:write('\n\t  ' .. homepage .. '\n')
+   if only_luajit then
+      f:write('\ncomment "' .. lcname .. ' needs LuaJIT"\n')
+      f:write('\tdepends on !BR2_PACKAGE_LUAJIT\n')
+   end
+   f:close()
+end
+
+local function generate_mk (rockspec, lcname, licenses)
+   local function escape (s)
+      return s:gsub('-', '%%-'):gsub('%.', '%%.')
+   end
+
+   local ucname = brname(lcname)
+   local need_name_upstream = false
+   local need_version_upstream = false
+   local name_upstream = rockspec.package
+   local version = rockspec.version
+   local version_upstream = version:match('^([^-]+)-')
+   local revision = version:match('-(%d+)$')
+   local license = rockspec.description.license
+   local subdir = rockspec.source.dir
+   if subdir then
+      local root = subdir:match('^(.-)-' .. escape(version) .. '$')
+      if root then
+         subdir = root .. '-$(' .. ucname .. '_VERSION)'
+      end
+      root = subdir:match('^(.--[Vv])' .. escape(version_upstream) .. '$')
+      if root then
+         need_version_upstream = true
+         subdir = root .. '$(' .. ucname .. '_VERSION_UPSTREAM)'
+      end
+      root = subdir:match('^(.-)-' .. escape(version_upstream) .. '$')
+      if root then
+         if root == lcname then
+            subdir = nil
+         elseif root == name_upstream then
+            subdir = nil
+            need_name_upstream = true
+         else
+            need_version_upstream = true
+            subdir = root .. '-$(' .. ucname .. '_VERSION_UPSTREAM)'
+         end
+      end
+   end
+   local external_dependencies = get_external_dependencies(rockspec)
+   local fname = 'package/' .. lcname .. '/' .. lcname .. '.mk'
+   local f = assert(io.open(fname, 'w'))
+   util.printout('write ' .. fname)
+   f:write('################################################################################\n')
+   f:write('#\n')
+   f:write('# ' .. lcname .. '\n')
+   f:write('#\n')
+   f:write('################################################################################\n')
+   f:write('\n')
+   if need_version_upstream then
+      f:write(ucname .. '_VERSION_UPSTREAM = ' .. version_upstream .. '\n')
+      f:write(ucname .. '_VERSION = $(' .. ucname .. '_VERSION_UPSTREAM)-' .. revision .. '\n')
+   else
+      f:write(ucname .. '_VERSION = ' .. version .. '\n')
+   end
+   if lcname ~= name_upstream:lower() or need_name_upstream then
+      f:write(ucname .. '_NAME_UPSTREAM = ' .. name_upstream .. '\n')
+   end
+   if subdir then
+      f:write(ucname .. '_SUBDIR = ' .. subdir .. '\n')
+   end
+   if license then
+      f:write(ucname .. '_LICENSE = ' .. brlicense(license) .. '\n')
+   end
+   if #licenses == 1 then
+      f:write(ucname .. '_LICENSE_FILES = $(' .. ucname .. '_SUBDIR)/' .. licenses[1] .. '\n')
+   elseif #licenses > 1 then
+      f:write(ucname .. '_LICENSE_FILES =')
+      for i = 1, #licenses do
+         local file = licenses[i]
+         f:write(' \\\n    $(' .. ucname .. '_SUBDIR)/' .. file)
+      end
+      f:write('\n')
+   end
+   if #external_dependencies > 0 then
+      f:write(ucname .. '_DEPENDENCIES = ' .. table.concat(external_dependencies, ' ') .. '\n')
+   end
+   f:write('\n$(eval $(luarocks-package))\n')
+   f:close()
+end
+
+local function generate_hash (rockspec, lcname, rock_file, licenses, digest)
+   local subdir = rockspec.source.dir
+   local fname = 'package/' .. lcname .. '/' .. lcname .. '.hash'
+   local f = assert(io.open(fname, 'w'))
+   util.printout('write ' .. fname)
+   f:write('# computed by luarocks/buildroot\n')
+   f:write('sha256 ' .. digest[rock_file] .. '  ' .. rock_file .. '\n')
+   for i = 1, #licenses do
+      local file = licenses[i]
+      f:write('sha256 ' .. digest[file] .. '  ' .. subdir .. '/' .. file .. '\n')
+   end
+   f:close()
+end
+
+--- Driver function for the "buildroot" command.
+-- @param rockname string: the name of a rock to be fetched and unpacked.
+-- @param brname string: the name used by Buildroot (optional)
+-- @return boolean: true if successful
+function buildroot.command(flags, rockname, fsname)
+   if type(rockname) ~= 'string' then
+      return nil, "Argument missing. "..util.see_help('buildroot')
+   end
+   fsname = fsname or rockname
+   assert(type(fsname) == 'string')
+
+   local query = queries.new(rockname:lower(), nil, false, 'src')
+   local url, err = search.find_suitable_rock(query)
+   if not url then
+      return nil, "Could not find a result named " .. tostring(query) .. ": " .. err
+   end
+   local rock_file = dir.base_name(url)
+
+   local temp_dir, err = fs.make_temp_dir(rockname)
+   if not temp_dir then
+      return nil, "Failed creating temporary dir: " .. err
+   end
+   local ok, err = fs.change_dir(temp_dir)
+   if not ok then return nil, err end
+
+   ok = fs.download(url, rock_file, true)
+   if not ok then
+      return nil, "Failed downloading " .. url
+   end
+
+   local digest = {}
+   digest[rock_file], err = get_digest(rock_file)
+   if not digest[rock_file] then return nil, err end
+   ok, err = fs.unzip(rock_file)
+   if not ok then return nil, err end
+
+   local rockspec_file = rock_file:gsub('%.src%.rock$', '.rockspec')
+   local rockspec, err = fetch.load_rockspec(rockspec_file)
+   if not rockspec then
+      return nil, "Error loading rockspec: " .. err
+   end
+   if rockspec.source.file then
+      ok, err = fs.unpack_archive(rockspec.source.file)
+      if not ok then return nil, err end
+   end
+
+   if rockspec.source.dir ~= '.' then
+      fs.copy(rockspec.local_abs_filename, rockspec.source.dir, 'read')
+   end
+
+   local build_type = rockspec.build.type
+   if build_type ~= 'none' and build_type ~= 'builtin' and build_type ~= 'module' then
+      util.printout('[' .. rockspec.package .. "] build_type '" .. build_type .. "' not supported")
+   end
+
+   local licenses = {}
+   ok, err = fs.change_dir(rockspec.source.dir)
+   if not ok then return nil, err end
+   local files = fs.find()
+   for i = 1, #files do
+      local v = files[i]
+      if v == 'COPYING'
+         or v == 'COPYRIGHT'
+         or v:match('^LICENSE') then
+         licenses[#licenses+1] = v
+         digest[v], err = get_digest(v)
+         if not digest[v] then return nil, err end
+      end
+   end
+   if #licenses == 0 then
+      for i = 1, #files do
+         local v = files[i]
+         if v:match('^doc/LICENSE')
+            or v:match('^doc/license')
+            or v:match('^doc/us/license') then
+            licenses[#licenses+1] = v
+            digest[v], err = get_digest(v)
+            if not digest[v] then return nil, err end
+         end
+      end
+   end
+   fs.pop_dir()
+   table.sort(licenses)
+
+   fs.pop_dir()
+   ok, err = fs.make_dir('package/' .. fsname:lower())
+   if not ok then return nil, err end
+
+   generate_config(rockspec, fsname:lower())
+   generate_mk(rockspec, fsname:lower(), licenses)
+   generate_hash(rockspec, fsname:lower(), rock_file, licenses, digest)
+
+   return true
+end
+
+return buildroot
-- 
2.17.1