First Commit

toolchain/Makefile

@@ -0,0 +1,20 @@
+.PHONY: all install clean
+
+PREFIX  ?= /usr/local
+BINDIR  ?= $(PREFIX)/bin
+LIBDIR  ?= $(PREFIX)/lib/zeta-toolchain
+
+all:
+	@echo "zeta-toolchain: nothing to compile (Lua scripts)"
+	@echo "  make install  →  $(BINDIR)  +  $(LIBDIR)"
+
+install:
+	install -Dm755 cli/zeta-cli         $(DESTDIR)$(BINDIR)/zeta-cli
+	install -Dm755 builder/zeta-makepkg $(DESTDIR)$(BINDIR)/zeta-makepkg
+	install -d $(DESTDIR)$(LIBDIR)
+	cp -r lib/* $(DESTDIR)$(LIBDIR)
+
+clean:
+	rm -rf /tmp/zeta-makepkg
+
+.DEFAULT_GOAL := all

toolchain/builder/zeta-makepkg

@@ -0,0 +1,273 @@
+#!/usr/bin/env lua
+-- zeta-makepkg — build Zeta binary packages from declarative .recipe files.
+--
+-- Usage:
+--   zeta-makepkg <recipe> [flags]    Build a package from a recipe
+--   zeta-makepkg --index [flags]     Regenerate packages/index.lua
+--
+-- Flags:
+--   --output <dir>   Output repository root (default: .)
+--   --no-index       Skip index.lua update
+--   --keep-work      Preserve build work directory
+--   --force          Overwrite existing package
+--   --help           Show this help
+--
+-- Pipeline:
+--   LOAD recipe → FETCH source → EXTRACT → BUILD → TEST → PACKAGE → INDEX
+
+-- Lua 5.1 compat: arg[0] is the script path, not the interpreter.
+local here
+if arg and arg[0] and arg[0]:match("[/\\]") then
+  here = arg[0]:match("^(.*)[/\\][^/\\]*$")
+elseif arg and arg[-1] then
+  -- Lua 5.1 sends script path as arg[-1] when using env.
+  here = arg[-1]:match("^(.*)[/\\][^/\\]*$")
+else
+  here = "."
+end
+
+-- Resolve the real directory in case we were invoked via a symlink.
+if here then
+  local f = io.popen("cd " .. here:gsub("'", "'\\''") .. " 2>/dev/null && pwd")
+  if f then
+    local real = f:read("*l")
+    f:close()
+    if real and real ~= "" then here = real end
+  end
+else
+  here = "."
+end
+
+-- Library path: works both from the repo tree (../lib/) and when installed
+-- via 'make install' (/usr/local/lib/zeta-toolchain/).
+package.path = here .. "/../lib/?.lua;"
+  .. here .. "/../lib/zeta-toolchain/?.lua;"
+  .. package.path
+
+local recipe  = require("recipe")
+local builder = require("builder")
+local packager = require("packager")
+local indexer = require("indexer")
+local path    = require("path")
+local log     = require("log")
+
+---------------------------------------------------------------------------
+-- Help
+---------------------------------------------------------------------------
+
+local HELP = [[
+zeta-makepkg — build Zeta binary packages from declarative .recipe files.
+
+Usage:
+  zeta-makepkg <recipe> [flags]
+  zeta-makepkg --index [flags]
+
+Commands:
+  <recipe>           Build a package from a .recipe file
+  --index            Regenerate packages/index.lua from existing package.lua files
+
+Flags:
+  --output <dir>     Output repository root (default: .)
+                     Creates packages/<name>/ with tarball + package.lua
+  -j, --jobs <N>    Number of parallel build jobs (default: nproc)
+  --no-index         Don't update packages/index.lua after building
+  --keep-work        Don't remove the build work directory
+  --force            Overwrite existing package tarball
+  --help             Show this help
+
+Cache:
+  Downloaded sources are cached in ~/.cache/zeta-makepkg/sources/
+  Build work is done in /tmp/zeta-makepkg/<name>-<timestamp>/
+
+Examples:
+  zeta-makepkg mypkg.recipe
+  zeta-makepkg mypkg.recipe --output ~/zeta-packages --force
+  zeta-makepkg --index --output ~/zeta-packages
+]]
+
+---------------------------------------------------------------------------
+-- CLI parsing
+---------------------------------------------------------------------------
+
+local function parse_cli(args)
+  local opts = {
+    output    = ".",
+    no_index  = false,
+    keep_work = false,
+    force     = false,
+    index     = false,
+    help      = false,
+    recipe    = nil,
+    jobs      = nil,  -- nil = auto-detect (nproc)
+  }
+
+  local i = 1
+  while i <= #args do
+    local a = args[i]
+    if a == "--help" or a == "-h" then
+      opts.help = true
+    elseif a == "--index" then
+      opts.index = true
+    elseif a == "--output" then
+      i = i + 1
+      if i > #args then
+        io.stderr:write("error: --output requires a directory argument\n")
+        return nil
+      end
+      opts.output = args[i]
+    elseif a == "--no-index" then
+      opts.no_index = true
+    elseif a == "--keep-work" then
+      opts.keep_work = true
+    elseif a == "--force" then
+      opts.force = true
+    elseif a == "--jobs" then
+      i = i + 1
+      if i > #args then
+        io.stderr:write("error: --jobs requires a number argument\n")
+        return nil
+      end
+      local n = tonumber(args[i])
+      if not n or n < 1 then
+        io.stderr:write(("error: invalid jobs value %q\n"):format(args[i]))
+        return nil
+      end
+      opts.jobs = n
+    elseif a:match("^%-j%d+$") then
+      local n = tonumber(a:match("^%-j(%d+)$"))
+      opts.jobs = n
+    elseif a == "-j" then
+      i = i + 1
+      if i > #args then
+        io.stderr:write("error: -j requires a number argument\n")
+        return nil
+      end
+      local n = tonumber(args[i])
+      if not n or n < 1 then
+        io.stderr:write(("error: invalid jobs value %q\n"):format(args[i]))
+        return nil
+      end
+      opts.jobs = n
+    elseif a:match("^%-") then
+      io.stderr:write(("error: unknown flag %s\n"):format(a))
+      return nil
+    elseif not opts.recipe and not opts.index then
+      opts.recipe = a
+    else
+      io.stderr:write(("error: unexpected argument %s\n"):format(a))
+      return nil
+    end
+    i = i + 1
+  end
+
+  return opts
+end
+
+---------------------------------------------------------------------------
+-- Build pipeline
+---------------------------------------------------------------------------
+
+local function run_build(recipe_path, opts)
+  -- 1. Load recipe
+  local r, err = recipe.load(recipe_path)
+  if not r then
+    log.fatal(("recipe error: %s"):format(tostring(err)))
+  end
+
+  -- 2. Set up output directory
+  local packages_dir = path.join(opts.output, "packages")
+  local pkg_dir = path.join(packages_dir, r.name)
+
+  if path.exists(pkg_dir) and not opts.force then
+    log.fatal(("package %s already exists at %s (use --force to overwrite)"):format(
+      r.name, pkg_dir))
+  end
+  path.mkdir_p(pkg_dir)
+
+  -- 3. Work directories
+  local stamp = os.date("%Y%m%d-%H%M%S")
+  local work_dir = path.join("/tmp/zeta-makepkg", r.name .. "-" .. stamp)
+  local stage_dir = path.join(work_dir, "stage")
+  path.mkdir_p(stage_dir)
+
+  log.info(("work directory: %s"):format(work_dir))
+
+  -- 4. Cache directory
+  local cache_dir = path.join(os.getenv("HOME") or "/tmp", ".cache", "zeta-makepkg", "sources")
+
+  -- 5. Fetch source
+  local cache_file = builder.fetch_source(r, cache_dir)
+
+  -- 6. Extract source
+  local source_dir = builder.extract_source(r, cache_file, work_dir)
+
+  -- 7. Build
+  builder.run_build(r, source_dir, stage_dir, { jobs = opts.jobs })
+
+  -- 8. Test (optional)
+  if r.test then
+    builder.run_test(r.test, stage_dir)
+  else
+    log.info("no test command — skipping verification")
+  end
+
+  -- 9. Package
+  local tarball_path = path.join(pkg_dir, r.name .. "-" .. r.version .. ".tar.gz")
+  local tarball_sha256 = packager.create_tarball(stage_dir, tarball_path)
+
+  -- 10. Write package.lua manifest
+  packager.write_manifest(r, tarball_sha256, pkg_dir)
+
+  -- 11. Update index
+  if not opts.no_index then
+    indexer.generate(packages_dir)
+  else
+    log.info("--no-index: skipping index update")
+  end
+
+  -- 12. Cleanup
+  if not opts.keep_work then
+    path.run("rm -rf " .. path.quote(work_dir))
+  else
+    log.info(("--keep-work: work directory preserved at %s"):format(work_dir))
+  end
+
+  log.ok(("%s-%s built successfully"):format(r.name, r.version))
+  log.info(("output: %s"):format(pkg_dir))
+end
+
+local function run_index(opts)
+  local packages_dir = path.join(opts.output, "packages")
+  indexer.generate(packages_dir)
+end
+
+---------------------------------------------------------------------------
+-- Main
+---------------------------------------------------------------------------
+
+local args = {}
+for i = 1, #arg do args[i] = arg[i] end
+
+local opts = parse_cli(args)
+if not opts then
+  io.stderr:write("Run 'zeta-makepkg --help' for usage.\n")
+  os.exit(1)
+end
+
+if opts.help then
+  io.write(HELP)
+  os.exit(0)
+end
+
+if opts.index then
+  run_index(opts)
+elseif opts.recipe then
+  local ok, err = pcall(run_build, opts.recipe, opts)
+  if not ok then
+    log.fatal(tostring(err))
+  end
+else
+  io.stderr:write("error: no recipe specified\n")
+  io.stderr:write("Run 'zeta-makepkg --help' for usage.\n")
+  os.exit(1)
+end

toolchain/cli/zeta-cli

@@ -0,0 +1,322 @@
+#!/usr/bin/env lua
+-- zeta-cli — interactive recipe creation wizard for zeta-makepkg.
+--
+-- Walks through every recipe field with prompts, validation, and
+-- smart defaults. Writes a ready-to-use .recipe file.
+
+local here
+if arg and arg[0] and arg[0]:match("[/\\]") then
+  here = arg[0]:match("^(.*)[/\\][^/\\]*$")
+elseif arg and arg[-1] then
+  here = arg[-1]:match("^(.*)[/\\][^/\\]*$")
+else
+  here = "."
+end
+if here then
+  local f = io.popen("cd " .. here:gsub("'", "'\\''") .. " 2>/dev/null && pwd")
+  if f then local real = f:read("*l"); f:close(); if real and real ~= "" then here = real end end
+end
+
+-- Library path: works both from the repo tree (../lib/) and when installed
+-- via 'make install' (/usr/local/lib/zeta-toolchain/).
+package.path = here .. "/../lib/?.lua;"
+  .. here .. "/../lib/zeta-toolchain/?.lua;"
+  .. package.path
+
+local recipe = require("recipe")
+local path   = require("path")
+
+---------------------------------------------------------------------------
+-- Terminal helpers
+---------------------------------------------------------------------------
+
+local function bold(s)  return "\27[1m" .. s .. "\27[0m" end
+local function dim(s)   return "\27[2m" .. s .. "\27[0m" end
+local function green(s) return "\27[32m" .. s .. "\27[0m" end
+local function red(s)   return "\27[31m" .. s .. "\27[0m" end
+local function cyan(s)  return "\27[36m" .. s .. "\27[0m" end
+
+local function prompt(label, default, validator)
+  local suffix = ""
+  if default and default ~= "" then
+    suffix = dim(" [" .. default .. "]")
+  end
+  io.write(label .. suffix .. ": ")
+  io.flush()
+  local line = io.read("*l")
+  if not line then
+    io.write("\n")
+    os.exit(0)
+  end
+  line = line:gsub("^%s+", ""):gsub("%s+$", "")
+  if line == "" and default then line = default end
+  if validator then
+    local ok, err = validator(line)
+    if not ok then
+      io.write(red("  " .. err .. "\n"))
+      return prompt(label, default, validator)
+    end
+  end
+  return line
+end
+
+local function confirm(msg)
+  io.write(msg .. " [Y/n] ")
+  io.flush()
+  local line = io.read("*l")
+  if not line then io.write("\n"); os.exit(0) end
+  line = line:gsub("^%s+", ""):gsub("%s+$", ""):lower()
+  return line == "" or line == "y" or line == "yes"
+end
+
+local function choose(label, options)
+  io.write(bold(label) .. "\n")
+  for i, opt in ipairs(options) do
+    io.write(string.format("  %d) %s\n", i, opt))
+  end
+  io.write("  Choice [1]: ")
+  io.flush()
+  local line = io.read("*l")
+  if not line then io.write("\n"); os.exit(0) end
+  line = line:gsub("^%s+", ""):gsub("%s+$", "")
+  local n = tonumber(line)
+  if not n or n < 1 or n > #options then n = 1 end
+  return options[n]
+end
+
+---------------------------------------------------------------------------
+-- Field validators
+---------------------------------------------------------------------------
+
+local function valid_name(name)
+  if name == "" then return false, "name cannot be empty" end
+  if not path.sanitize_name(name) then
+    return false, "name must contain only alphanumeric characters, dots, underscores, plus, and hyphens"
+  end
+  return true
+end
+
+local function valid_version(v)
+  if v == "" then return false, "version cannot be empty" end
+  return true
+end
+
+local function valid_summary(s)
+  if s == "" then return false, "summary cannot be empty" end
+  return true
+end
+
+local function valid_url(u)
+  if u == "" then return false, "url cannot be empty" end
+  return true
+end
+
+local function valid_sha256(h)
+  if h == "" then return true end  -- ok to skip
+  if not h:lower():match("^" .. string.rep("%x", 64) .. "$") then
+    return false, "sha256 must be exactly 64 hex characters (or press Enter to skip)"
+  end
+  return true
+end
+
+local function valid_jobs(j)
+  if j == "" then return true end
+  local n = tonumber(j)
+  if not n or n < 1 or n % 1 ~= 0 then
+    return false, "jobs must be a positive integer (or press Enter to skip)"
+  end
+  return true
+end
+
+---------------------------------------------------------------------------
+-- Render the recipe as Lua source
+---------------------------------------------------------------------------
+
+local function render(rcp)
+  local lines = { "return {" }
+  local function e(s) return s:gsub('"', '\\"'):gsub("\n", "\\n") end
+
+  lines[#lines + 1] = string.format('  name           = "%s",', e(rcp.name))
+  lines[#lines + 1] = string.format('  version        = "%s",', e(rcp.version))
+  lines[#lines + 1] = string.format('  summary        = "%s",', e(rcp.summary))
+  lines[#lines + 1] = string.format('  url            = "%s",', e(rcp.url))
+
+  if rcp.sha256 and rcp.sha256 ~= "" then
+    lines[#lines + 1] = string.format('  sha256         = "%s",', rcp.sha256)
+  else
+    lines[#lines + 1] = "  sha256         = nil,"
+  end
+
+  if #rcp.deps > 0 then
+    local d = {}
+    for _, dep in ipairs(rcp.deps) do d[#d+1] = '"' .. e(dep) .. '"' end
+    lines[#lines + 1] = string.format("  deps           = { %s },", table.concat(d, ", "))
+  else
+    lines[#lines + 1] = "  deps           = {},"
+  end
+
+  lines[#lines + 1] = string.format('  build_system   = "%s",', rcp.build_system)
+
+  if rcp.configure_args and #rcp.configure_args > 0 then
+    local a = {}
+    for _, arg in ipairs(rcp.configure_args) do a[#a+1] = '"' .. e(arg) .. '"' end
+    lines[#lines + 1] = string.format("  configure_args = { %s },", table.concat(a, ", "))
+  end
+
+  if rcp.build_system == "custom" then
+    lines[#lines + 1] = string.format('  build_script   = "%s",', e(rcp.build_script or "build.sh"))
+  end
+
+  if rcp.test and rcp.test ~= "" then
+    lines[#lines + 1] = string.format('  test           = "%s",', e(rcp.test):gsub("${DESTDIR}", "${DESTDIR}"))
+  end
+
+  if rcp.files and #rcp.files > 0 then
+    local f = {}
+    for _, file in ipairs(rcp.files) do f[#f+1] = '"' .. e(file) .. '"' end
+    lines[#lines + 1] = string.format("  files          = { %s },", table.concat(f, ", "))
+  end
+
+  lines[#lines + 1] = "}"
+  return table.concat(lines, "\n") .. "\n"
+end
+
+---------------------------------------------------------------------------
+-- Wizard
+---------------------------------------------------------------------------
+
+local function wizard()
+  io.write("\n")
+  io.write(bold("  ═══ zeta-makepkg recipe wizard ═══") .. "\n\n")
+
+  local rcp = {}
+
+  -- 1. Name
+  rcp.name = prompt("Package name", nil, valid_name)
+
+  -- 2. Version
+  rcp.version = prompt("Version", nil, valid_version)
+
+  -- 3. Summary
+  rcp.summary = prompt("Summary", nil, valid_summary)
+
+  -- 4. URL
+  rcp.url = prompt("Source URL", nil, valid_url)
+
+  -- 5. SHA256
+  rcp.sha256 = prompt("Source SHA256", "", valid_sha256)
+
+  -- 6. Dependencies
+  io.write("Dependencies" .. dim(" [comma-separated, e.g. libfoo, libbar>=2.0]") .. ": ")
+  io.flush()
+  local deps_line = io.read("*l")
+  if not deps_line then io.write("\n"); os.exit(0) end
+  deps_line = deps_line:gsub("^%s+", ""):gsub("%s+$", "")
+  rcp.deps = {}
+  if deps_line ~= "" then
+    for raw in deps_line:gmatch("[^,]+") do
+      local dep = raw:gsub("^%s+", ""):gsub("%s+$", "")
+      if dep ~= "" then rcp.deps[#rcp.deps + 1] = dep end
+    end
+  end
+
+  -- 7. Build system
+  rcp.build_system = choose("Build system:", {
+    "autotools  (./configure && make && make install)",
+    "cmake      (cmake -B build && cmake --build && cmake --install)",
+    "meson      (meson setup build && ninja && ninja install)",
+    "make       (make && make install)",
+    "cargo      (cargo build --release)",
+    "custom     (run build_script)",
+  })
+
+  -- Map the selected string back to the key
+  rcp.build_system = rcp.build_system:match("^(%S+)")
+
+  -- 8. Configure args (skip for cargo)
+  rcp.configure_args = {}
+  if rcp.build_system ~= "cargo" then
+    io.write("Configure args" .. dim(" [comma-separated, e.g. --enable-feature, --without-x]") .. ": ")
+    io.flush()
+    local args_line = io.read("*l")
+    if not args_line then io.write("\n"); os.exit(0) end
+    args_line = args_line:gsub("^%s+", ""):gsub("%s+$", "")
+    if args_line ~= "" then
+      for raw in args_line:gmatch("[^,]+") do
+        local arg = raw:gsub("^%s+", ""):gsub("%s+$", "")
+        if arg ~= "" then rcp.configure_args[#rcp.configure_args + 1] = arg end
+      end
+    end
+  end
+
+  -- 9. Build script (custom only)
+  if rcp.build_system == "custom" then
+    rcp.build_script = prompt("Build script path", "build.sh")
+  end
+
+  -- 10. Test command
+  io.write("Test command" .. dim(" [${DESTDIR} = install staging dir, Enter to skip]") .. "\n")
+  io.write("  Example: ${DESTDIR}/usr/bin/" .. rcp.name .. " --version\n")
+  rcp.test = prompt("  Test", "")
+  if rcp.test == "" then rcp.test = nil end
+
+  -- 11. Files whitelist
+  io.write("Files whitelist" .. dim(" [comma-separated relative paths, Enter = all files]") .. "\n")
+  io.write("  Example: usr/bin/" .. rcp.name .. ", usr/lib/lib" .. rcp.name .. ".so\n")
+  io.write("  Files: ")
+  io.flush()
+  local files_line = io.read("*l")
+  if not files_line then io.write("\n"); os.exit(0) end
+  files_line = files_line:gsub("^%s+", ""):gsub("%s+$", "")
+  if files_line ~= "" then
+    rcp.files = {}
+    for raw in files_line:gmatch("[^,]+") do
+      local file = raw:gsub("^%s+", ""):gsub("%s+$", ""):gsub("^/*", "")
+      if file ~= "" then rcp.files[#rcp.files + 1] = file end
+    end
+  end
+
+  -- 12. Preview
+  io.write("\n")
+  io.write(bold("  ═══ Preview ═══") .. "\n\n")
+  io.write(render(rcp))
+  io.write("\n")
+
+  if not confirm("Write this recipe?") then
+    io.write("Aborted.\n")
+    os.exit(0)
+  end
+
+  -- 13. Output path
+  local default_path = rcp.name .. ".recipe"
+  local out_path = prompt("Save as", default_path)
+
+  local f, err = io.open(out_path, "w")
+  if not f then
+    io.write(red("Error: ") .. tostring(err) .. "\n")
+    os.exit(1)
+  end
+  f:write(render(rcp))
+  f:close()
+
+  -- Final validation pass
+  local ok, verr = pcall(recipe.load, out_path)
+  if not ok then
+    io.write(red("Warning: generated recipe fails validation: ") .. tostring(verr) .. "\n")
+  end
+
+  io.write("\n" .. green("  recipe written to " .. out_path) .. "\n")
+end
+
+---------------------------------------------------------------------------
+-- Main
+---------------------------------------------------------------------------
+
+local args = {}
+for i = 1, #arg do args[i] = arg[i] end
+
+local ok, err = pcall(wizard)
+if not ok then
+  io.write(red("Error: ") .. tostring(err) .. "\n")
+  os.exit(1)
+end

toolchain/examples/hello.recipe

@@ -0,0 +1,16 @@
+-- hello.recipe — minimal example for zeta-makepkg.
+--
+-- This builds a simple C program using the Make build system.
+-- Place a hello-1.0.tar.gz alongside the recipe or point `url` to
+-- a remote location.
+
+return {
+  name         = "hello",
+  version      = "1.0",
+  summary      = "A tiny demonstration program for Zeta",
+  url          = "hello-1.0.tar.gz",
+  sha256       = nil,
+  deps         = {},
+  build_system = "make",
+  test         = "test -f ${DESTDIR}/usr/bin/hello",
+}

toolchain/examples/make.recipe

@@ -0,0 +1,16 @@
+-- make.recipe — builds GNU Make itself.
+--
+-- GNU Make uses the autotools build system. The --without-guile flag
+-- avoids pulling in the Guile dependency for a leaner build.
+
+return {
+  name           = "make",
+  version        = "4.4.1",
+  summary        = "GNU Make — build automation tool",
+  url            = "https://ftp.gnu.org/gnu/make/make-4.4.1.tar.gz",
+  sha256         = nil,
+  deps           = {},
+  build_system   = "autotools",
+  configure_args = { "--without-guile" },
+  test           = "${DESTDIR}/usr/bin/make --version",
+}

toolchain/examples/meson-example.recipe

@@ -0,0 +1,16 @@
+-- meson-example.recipe — meson build system example.
+--
+-- Demonstrates: meson, configure_args, dependencies, source sha256.
+
+return {
+  name           = "my-lib",
+  version        = "2.0.0",
+  summary        = "An example library built with Meson",
+  url            = "https://example.com/my-lib-2.0.0.tar.gz",
+  sha256         = nil,
+  deps           = { "libfoo>=1.0", "libbar" },
+  build_system   = "meson",
+  configure_args = { "-Ddocs=false", "-Dtests=false" },
+  test           = "test -f ${DESTDIR}/usr/lib/libmy-lib.so",
+  files          = { "usr/lib/libmy-lib.so", "usr/include/my-lib.h" },
+}

toolchain/lib/builder.lua

@@ -0,0 +1,307 @@
+-- builder.lua -- source fetching, extraction, build dispatch, and test runner.
+--
+-- Handles the full build pipeline for a recipe:
+--   1. fetch_source   — download to cache (or detect git)
+--   2. extract_source — unpack tarball or clone git repo
+--   3. run_build      — dispatch autotools/cmake/meson/make/cargo/custom
+--   4. run_test       — execute post-build verification command
+--
+-- All subprocesses run in a minimal environment. Build tools (meson, cmake,
+-- ninja, cargo, etc.) must be installed on the host system.
+
+local builder = {}
+
+local path = require("path")
+local log  = require("log")
+
+---------------------------------------------------------------------------
+-- Utilities
+---------------------------------------------------------------------------
+
+local function find_downloader()
+  if path.have("curl") then return "curl" end
+  if path.have("wget") then return "wget" end
+  return nil
+end
+
+local function download(url, dest)
+  local dl = find_downloader()
+  if not dl then
+    error("no downloader found (install curl or wget)", 0)
+  end
+  log.detail("downloading " .. url)
+  local tmp = dest .. ".part"
+  local ok
+  if dl == "curl" then
+    ok = path.run("curl -L --fail --show-error -sS -o "
+      .. path.quote(tmp) .. " " .. path.quote(url))
+  else
+    ok = path.run("wget -q -O " .. path.quote(tmp) .. " " .. path.quote(url))
+  end
+  if not ok then
+    os.remove(tmp)
+    error(("download failed: %s"):format(url), 0)
+  end
+  return os.rename(tmp, dest)
+end
+
+local function sha256_file(filepath)
+  -- Prefer native tools for speed, fall back to openssl.
+  local f = io.popen("sha256sum " .. path.quote(filepath) .. " 2>/dev/null")
+  if f then
+    local digest = f:read("*l")
+    f:close()
+    local hex = digest and digest:match("^(%x+)")
+    if hex then return hex end
+  end
+  f = io.popen("shasum -a 256 " .. path.quote(filepath) .. " 2>/dev/null")
+  if f then
+    local digest = f:read("*l")
+    f:close()
+    local hex = digest and digest:match("^(%x+)")
+    if hex then return hex end
+  end
+  f = io.popen("openssl dgst -sha256 " .. path.quote(filepath) .. " 2>/dev/null")
+  if f then
+    local digest = f:read("*l")
+    f:close()
+    local hex = digest and digest:match("=(%x+)")
+    if hex then return hex end
+  end
+  error("sha256: no supported tool found (install sha256sum, shasum, or openssl)", 0)
+end
+
+local function get_nproc()
+  local f = io.popen("nproc 2>/dev/null")
+  if not f then return 1 end
+  local n = tonumber(f:read("*l"))
+  f:close()
+  return (n and n > 0) and n or 1
+end
+
+-- After extracting a tarball, detect the source root:
+-- if the extraction dir contains exactly one subdirectory, use that.
+-- Otherwise use the extraction dir itself.
+local function detect_source_dir(extract_dir)
+  local f = io.popen("ls -1 " .. path.quote(extract_dir) .. " 2>/dev/null")
+  if not f then return extract_dir end
+  local entries = {}
+  for line in f:lines() do
+    if line ~= "" and line ~= "." and line ~= ".." then
+      entries[#entries + 1] = line
+    end
+  end
+  f:close()
+  if #entries == 1 then
+    return path.join(extract_dir, entries[1])
+  end
+  return extract_dir
+end
+
+---------------------------------------------------------------------------
+-- Public API
+---------------------------------------------------------------------------
+
+-- Fetch source into the cache directory. Returns the cached file path,
+-- or nil if the URL is a git repository (signals "use git clone").
+function builder.fetch_source(recipe, cache_dir)
+  local url = recipe.url
+
+  -- Git repos are cloned, not cached as files.
+  if url:match("%.git$") or url:match("^git://") or url:match("^git@") then
+    log.detail("git source: will clone directly")
+    return nil
+  end
+
+  local url_base = url:match("[^/]+$") or "source"
+  local ext = ""
+  for _, e in ipairs({ ".tar.gz", ".tar.xz", ".tar.bz2", ".tar.zst", ".tgz", ".txz", ".tbz2", ".tzst" }) do
+    if url_base:lower():match(e:gsub("%.", "%%.") .. "$") then
+      ext = e
+      break
+    end
+  end
+  local cache_file = path.join(cache_dir, recipe.name .. "-" .. recipe.version .. ext)
+
+  if not path.exists(cache_file) then
+    path.mkdir_p(cache_dir)
+
+    if url:match("^https?://") then
+      log.step("downloading " .. url)
+      download(url, cache_file)
+    elseif url:match("^file://") then
+      local src = url:gsub("^file://", "")
+      log.step("copying " .. src)
+      if not path.run("cp " .. path.quote(src) .. " " .. path.quote(cache_file)) then
+        error(("failed to copy %s"):format(src), 0)
+      end
+    elseif url:match("^/") then
+      log.step("copying " .. url)
+      if not path.run("cp " .. path.quote(url) .. " " .. path.quote(cache_file)) then
+        error(("failed to copy %s"):format(url), 0)
+      end
+    else
+      error(("unrecognised url scheme: %s"):format(url), 0)
+    end
+  else
+    log.info("using cached source: " .. path.basename(cache_file))
+  end
+
+  -- Optional source checksum verification.
+  if recipe.sha256 then
+    log.step("verifying source sha256")
+    local computed = sha256_file(cache_file)
+    if computed ~= recipe.sha256 then
+      error(("source sha256 mismatch:\n  expected %s\n  got      %s"):format(
+        recipe.sha256, computed), 0)
+    end
+    log.ok("source sha256 verified")
+  end
+
+  return cache_file
+end
+
+-- Extract a source tarball or clone a git repository into work_dir/src.
+-- Returns the actual source root directory.
+function builder.extract_source(recipe, cache_file, work_dir)
+  local src_dir = path.join(work_dir, "src")
+
+  if not cache_file then
+    -- Git clone.
+    path.mkdir_p(work_dir)
+    log.step("cloning " .. recipe.url)
+    if not path.run("git clone --depth 1 " .. path.quote(recipe.url)
+      .. " " .. path.quote(src_dir)) then
+      error(("git clone failed for %s"):format(recipe.url), 0)
+    end
+    log.ok("cloned " .. recipe.name)
+    return src_dir
+  end
+
+  -- Tarball extraction.
+  log.step("extracting " .. path.basename(cache_file))
+  path.mkdir_p(src_dir)
+
+  local fname = cache_file:lower()
+  local cmd
+
+  if fname:match("%.tar%.gz$") or fname:match("%.tgz$") then
+    cmd = "tar -xzf " .. path.quote(cache_file) .. " -C " .. path.quote(src_dir) .. " --no-same-owner"
+  elseif fname:match("%.tar%.xz$") or fname:match("%.txz$") then
+    cmd = "tar -xJf " .. path.quote(cache_file) .. " -C " .. path.quote(src_dir) .. " --no-same-owner"
+  elseif fname:match("%.tar%.bz2$") or fname:match("%.tbz2$") then
+    cmd = "tar -xjf " .. path.quote(cache_file) .. " -C " .. path.quote(src_dir) .. " --no-same-owner"
+  elseif fname:match("%.tar%.zst$") or fname:match("%.tzst$") then
+    cmd = "tar --zstd -xf " .. path.quote(cache_file) .. " -C " .. path.quote(src_dir) .. " --no-same-owner"
+  elseif fname:match("%.tar$") then
+    cmd = "tar -xf " .. path.quote(cache_file) .. " -C " .. path.quote(src_dir) .. " --no-same-owner"
+  else
+    -- Unrecognised archive — try generic tar.
+    cmd = "tar -xf " .. path.quote(cache_file) .. " -C " .. path.quote(src_dir) .. " --no-same-owner"
+  end
+
+  if not path.run(cmd) then
+    error(("extraction failed for %s"):format(path.basename(cache_file)), 0)
+  end
+
+  local source_dir = detect_source_dir(src_dir)
+  log.detail("source directory: " .. source_dir)
+  return source_dir
+end
+
+-- Dispatch the build based on recipe.build_system.
+-- Commands run from the source directory, installing into stage_dir.
+function builder.run_build(recipe, source_dir, stage_dir, opts)
+  opts = opts or {}
+  path.mkdir_p(stage_dir)
+
+  local name = recipe.name
+  local bs   = recipe.build_system
+  local args = recipe.configure_args or {}
+  local args_str = ""
+  if #args > 0 then
+    args_str = " " .. table.concat(args, " ")
+  end
+  local njobs = opts.jobs or get_nproc()
+
+  log.step(("building %s (%s)"):format(name, bs))
+
+  local function run(cmd)
+    log.detail("$ " .. cmd)
+    if not path.run("cd " .. path.quote(source_dir) .. " && " .. cmd) then
+      error(("build step failed: %s"):format(cmd), 0)
+    end
+  end
+
+  if bs == "autotools" then
+    run("./configure --prefix=/usr" .. args_str)
+    run("make -j" .. njobs)
+    run("make install DESTDIR=" .. path.quote(stage_dir))
+
+  elseif bs == "cmake" then
+    run("cmake -B build -DCMAKE_INSTALL_PREFIX=/usr" .. args_str)
+    run("cmake --build build -j" .. njobs)
+    run("DESTDIR=" .. path.quote(stage_dir) .. " cmake --install build")
+
+  elseif bs == "meson" then
+    run("meson setup build --prefix=/usr" .. args_str)
+    run("ninja -C build")
+    run("DESTDIR=" .. path.quote(stage_dir) .. " ninja -C build install")
+
+  elseif bs == "make" then
+    run("make -j" .. njobs .. args_str)
+    run("make install DESTDIR=" .. path.quote(stage_dir))
+
+  elseif bs == "cargo" then
+    run("cargo build --release" .. args_str)
+    local bin_dir = path.join(stage_dir, "usr/bin")
+    path.mkdir_p(bin_dir)
+    -- Cargo puts binaries in target/release/<name>. Also support kebab-case.
+    local target = path.join(source_dir, "target", "release", name)
+    if not path.exists(target) then
+      -- Try kebab-case transformation: underscores → hyphens.
+      local kebab = name:gsub("_", "-")
+      target = path.join(source_dir, "target", "release", kebab)
+    end
+    if not path.exists(target) then
+      -- Try listing directory.
+      local f = io.popen("ls " .. path.quote(path.join(source_dir, "target", "release")) .. " 2>/dev/null")
+      if f then
+        for line in f:lines() do
+          local cand = path.join(source_dir, "target", "release", line)
+          if path.run("test -f " .. path.quote(cand) .. " -a -x " .. path.quote(cand)) then
+            target = cand
+            log.detail("detected cargo binary: " .. line)
+            break
+          end
+        end
+        f:close()
+      end
+    end
+    run("install -D " .. path.quote(target) .. " " .. path.quote(path.join(bin_dir, path.basename(target))))
+
+  elseif bs == "custom" then
+    local script = recipe.build_script
+    run("DESTDIR=" .. path.quote(stage_dir) .. " sh " .. path.quote(script))
+
+  else
+    error(("unknown build_system: %s"):format(bs), 0)
+  end
+
+  log.ok("build complete")
+  return true
+end
+
+-- Run the test command, substituting ${DESTDIR} with stage_dir.
+function builder.run_test(test_cmd, stage_dir)
+  local cmd = test_cmd:gsub("${DESTDIR}", stage_dir)
+  cmd = cmd:gsub("$DESTDIR", stage_dir)
+  log.step("testing: " .. cmd)
+  if not path.run(cmd) then
+    error(("test failed: %s"):format(cmd), 0)
+  end
+  log.ok("test passed")
+  return true
+end
+
+return builder

toolchain/lib/indexer.lua

@@ -0,0 +1,120 @@
+-- indexer.lua -- generates packages/index.lua from all package.lua manifests.
+--
+-- Scans <output>/packages/ for every subdirectory containing a package.lua.
+-- Each manifest is loaded in a sandboxed environment (no io, os, etc.) and
+-- its name, version, and summary are extracted. The resulting index is
+-- written as a Lua list, sorted by package name.
+
+local indexer = {}
+
+local path = require("path")
+local log  = require("log")
+
+---------------------------------------------------------------------------
+-- Sandboxed manifest loading
+---------------------------------------------------------------------------
+
+-- Load a package.lua file and extract { name, version, summary }.
+-- Runs in a locked-down environment — the manifest cannot access io, os,
+-- require, or any global state. Only pure table constructors are allowed.
+local function load_manifest_meta(filepath)
+  local f, err = io.open(filepath, "rb")
+  if not f then return nil, err end
+  local src = f:read("*a")
+  f:close()
+
+  local env = {}
+  local chunk
+  if setfenv then
+    chunk, err = loadstring(src, "@" .. filepath)
+    if chunk then setfenv(chunk, env) end
+  else
+    chunk, err = load(src, "@" .. filepath, "t", env)
+  end
+  if not chunk then
+    return nil, ("%s: syntax error: %s"):format(filepath, tostring(err))
+  end
+
+  local ok, raw = pcall(chunk)
+  if not ok or type(raw) ~= "table" then
+    return nil, ("%s: must return a table"):format(filepath)
+  end
+
+  local meta = {
+    name    = type(raw.name)    == "string" and raw.name    or nil,
+    version = type(raw.version) == "string" and raw.version or nil,
+    summary = type(raw.summary) == "string" and raw.summary or nil,
+  }
+
+  if not meta.name then
+    return nil, ("%s: missing or invalid name"):format(filepath)
+  end
+
+  return meta
+end
+
+---------------------------------------------------------------------------
+-- Index generation
+---------------------------------------------------------------------------
+
+-- Scan <packages_dir> for all subdirectories containing package.lua and
+-- write a sorted index.lua. Returns the path to the written index.
+function indexer.generate(packages_dir)
+  if not path.exists(packages_dir) then
+    log.warn("packages directory not found: " .. packages_dir)
+    return nil
+  end
+
+  log.step("generating index for " .. packages_dir)
+
+  -- Collect all package.lua files.
+  local f = io.popen("find " .. path.quote(packages_dir)
+    .. " -mindepth 2 -maxdepth 2 -name package.lua"
+    .. " -type f 2>/dev/null | sort")
+  if not f then
+    error(("cannot scan %s"):format(packages_dir), 0)
+  end
+
+  local entries = {}
+  for filepath in f:lines() do
+    local meta, err = load_manifest_meta(filepath)
+    if meta then
+      entries[#entries + 1] = meta
+    else
+      log.warn(tostring(err))
+    end
+  end
+  f:close()
+
+  -- Sort by name.
+  table.sort(entries, function(a, b) return a.name < b.name end)
+
+  -- Write index.lua
+  local index_path = path.join(packages_dir, "index.lua")
+  local lines = { "return {" }
+
+  for _, e in ipairs(entries) do
+    lines[#lines + 1] = string.format(
+      '  { name = %q, version = %q, summary = %q },',
+      e.name,
+      e.version or "",
+      e.summary or ""
+    )
+  end
+
+  lines[#lines + 1] = "}"
+
+  local tmp = index_path .. ".tmp"
+  local out, err = io.open(tmp, "wb")
+  if not out then
+    error(("cannot write %s: %s"):format(tmp, tostring(err)), 0)
+  end
+  out:write(table.concat(lines, "\n") .. "\n")
+  out:close()
+
+  os.rename(tmp, index_path)
+  log.ok(("index updated (%d packages)"):format(#entries))
+  return index_path
+end
+
+return indexer

toolchain/lib/log.lua

@@ -0,0 +1,60 @@
+-- log.lua -- always-verbose colored logging for zeta-makepkg.
+--
+-- Every operation is printed so the user sees exactly what is happening.
+-- Colors are disabled when TERM=dumb or NO_COLOR is set.
+
+local log = {}
+
+local function wants_color()
+  local t = os.getenv("TERM")
+  if not t or t == "" or t == "dumb" then return false end
+  if os.getenv("NO_COLOR") then return false end
+  return true
+end
+
+local COLOR = wants_color()
+
+local C = {
+  reset  = "\27[0m",
+  cyan   = "\27[36m",
+  green  = "\27[32m",
+  yellow = "\27[33m",
+  red    = "\27[31m",
+  dim    = "\27[2m",
+}
+
+local function paint(color, s)
+  if not COLOR then return s end
+  return C[color] .. s .. C.reset
+end
+
+function log.step(msg)
+  print(paint("cyan", "==> " .. msg))
+end
+
+function log.ok(msg)
+  print(paint("green", " ok  " .. msg))
+end
+
+function log.warn(msg)
+  io.stderr:write(paint("yellow", "warn ") .. msg .. "\n")
+end
+
+function log.error(msg)
+  io.stderr:write(paint("red", "error") .. " " .. msg .. "\n")
+end
+
+function log.info(msg)
+  print("  -  " .. msg)
+end
+
+function log.detail(msg)
+  print(paint("dim", "  .  " .. msg))
+end
+
+function log.fatal(msg)
+  log.error(msg)
+  os.exit(1)
+end
+
+return log

toolchain/lib/packager.lua

@@ -0,0 +1,167 @@
+-- packager.lua -- tarball creation, sha256 computation, and package.lua generation.
+--
+-- Converts a staged install tree (DESTDIR layout) into a Zeta-compatible
+-- binary tarball with archive strip=1 format. Computes the sha256 checksum
+-- of the output tarball and writes the package.lua manifest.
+
+local packager = {}
+
+local path = require("path")
+local log  = require("log")
+
+---------------------------------------------------------------------------
+-- Private helpers (must be defined before the public API that uses them)
+---------------------------------------------------------------------------
+
+local function escape(s)
+  return s:gsub('"', '\\"'):gsub("\n", "\\n")
+end
+
+local function escape_lua_string(s)
+  return s:gsub("\\", "\\\\"):gsub("'", "\\'")
+end
+
+local function human_size(filepath)
+  local f = io.open(filepath, "rb")
+  if not f then return "? B" end
+  local size = f:seek("end")
+  f:close()
+  if size >= 1024 * 1024 then
+    return string.format("%.1f MiB", size / (1024 * 1024))
+  elseif size >= 1024 then
+    return string.format("%.0f KiB", size / 1024)
+  end
+  return string.format("%d B", size)
+end
+
+local function sha256_file(filepath)
+  local f = io.popen("sha256sum " .. path.quote(filepath) .. " 2>/dev/null")
+  if f then
+    local line = f:read("*l")
+    f:close()
+    local hex = line and line:match("^(%x+)")
+    if hex then return hex end
+  end
+  f = io.popen("shasum -a 256 " .. path.quote(filepath) .. " 2>/dev/null")
+  if f then
+    local line = f:read("*l")
+    f:close()
+    local hex = line and line:match("^(%x+)")
+    if hex then return hex end
+  end
+  f = io.popen("openssl dgst -sha256 " .. path.quote(filepath) .. " 2>/dev/null")
+  if f then
+    local line = f:read("*l")
+    f:close()
+    local hex = line and line:match("=(%x+)")
+    if hex then return hex end
+  end
+  error("sha256: no supported tool found (install sha256sum, shasum, or openssl)", 0)
+end
+
+local function write_atomic(filepath, content)
+  local tmp = filepath .. ".tmp"
+  local f, err = io.open(tmp, "wb")
+  if not f then return nil, err end
+  f:write(content)
+  f:close()
+  return os.rename(tmp, filepath)
+end
+
+---------------------------------------------------------------------------
+-- Public API
+---------------------------------------------------------------------------
+
+-- Tar up the staging directory, strip=1 format.
+-- Files in the tarball are rooted at "./" so Zeta's strip=1 produces clean
+-- relative paths (usr/bin/foo, not ./usr/bin/foo).
+function packager.create_tarball(stage_dir, dest_path)
+  log.step("packaging " .. path.basename(dest_path))
+  path.mkdir_p(path.dirname(dest_path))
+
+  local cmd = "tar -czf " .. path.quote(dest_path)
+    .. " -C " .. path.quote(stage_dir) .. " ."
+
+  if not path.run(cmd) then
+    error(("failed to create tarball %s"):format(dest_path), 0)
+  end
+
+  local sha256 = sha256_file(dest_path)
+  log.detail(("sha256: %s"):format(sha256))
+  log.ok(("packaged %s (%s)"):format(path.basename(dest_path), human_size(dest_path)))
+
+  return sha256
+end
+
+-- Generate a Zeta-compatible package.lua manifest and write it to pkg_dir.
+-- The generated manifest uses archive mode (strip=1) and includes the
+-- computed sha256 of the binary tarball. Optional fields (deps, files,
+-- test) are included when present in the recipe.
+function packager.write_manifest(recipe, tarball_sha256, pkg_dir)
+  local lines = {}
+  local function emit(fmt, ...)
+    lines[#lines + 1] = string.format(fmt, ...)
+  end
+
+  emit("return {")
+  emit('  name    = "%s",', recipe.name)
+  emit('  version = "%s",', recipe.version)
+  emit('  summary = "%s",', escape(recipe.summary))
+  emit('  url     = "https://github.com/gretagen/zeta-packages/packages/%s/%s-%s.tar.gz",',
+    recipe.name, recipe.name, recipe.version)
+  emit('  sha256  = "%s",', tarball_sha256)
+
+  if #recipe.deps > 0 then
+    local dep_strs = {}
+    for _, d in ipairs(recipe.deps) do
+      dep_strs[#dep_strs + 1] = string.format('"%s"', escape(d))
+    end
+    emit('  deps    = { %s },', table.concat(dep_strs, ", "))
+  else
+    emit('  deps    = {},')
+  end
+
+  emit('  archive = { strip = 1 },')
+
+  if recipe.files then
+    local file_strs = {}
+    for _, f in ipairs(recipe.files) do
+      file_strs[#file_strs + 1] = string.format('"%s"', escape(f))
+    end
+    emit('  files   = { %s },', table.concat(file_strs, ", "))
+  end
+
+  if recipe.test then
+    -- Generate a test function that substitutes ${DESTDIR} -> p.install_root.
+    -- Splits the test command around each ${DESTDIR} and uses Lua's %q format
+    -- so every string segment is properly quoted.
+    emit("  test    = function(p)")
+    local parts = {}
+    local rem = recipe.test
+    while true do
+      local si, ei = rem:find("${DESTDIR}", 1, true)
+      if not si then
+        if rem ~= "" then parts[#parts + 1] = string.format("%q", rem) end
+        break
+      end
+      if si > 1 then
+        parts[#parts + 1] = string.format("%q", rem:sub(1, si - 1))
+      end
+      parts[#parts + 1] = "p.install_root"
+      rem = rem:sub(ei + 1)
+    end
+    emit("    p:run(%s)", table.concat(parts, " .. "))
+    emit("  end,")
+  end
+
+  emit("}")
+
+  local content = table.concat(lines, "\n") .. "\n"
+  local dest = path.join(pkg_dir, "package.lua")
+
+  write_atomic(dest, content)
+  log.ok("wrote package.lua")
+  return dest
+end
+
+return packager

toolchain/lib/path.lua

@@ -0,0 +1,124 @@
+-- path.lua -- minimal self-contained filesystem helpers for zeta-makepkg.
+--
+-- Deliberately avoids any external dependencies so the toolchain can run
+-- without Zeta installed. All subprocess calls use plain os.execute.
+
+local path = {}
+
+---------------------------------------------------------------------------
+-- String helpers
+---------------------------------------------------------------------------
+
+-- Join path components with a single separator. The first non-empty
+-- component decides whether the result is absolute; later components are
+-- treated as plain name pieces even if they carry a leading slash.
+function path.join(...)
+  local parts = {}
+  local abs = false
+  local first = true
+  for i = 1, select("#", ...) do
+    local part = tostring((select(i, ...)))
+    if part == "/" then
+      if first then abs = true end
+    elseif part ~= "" then
+      local p = part:gsub("^/+", ""):gsub("/+$", "")
+      if p ~= "" then
+        if first then abs = (part:match("^/") ~= nil) end
+        parts[#parts + 1] = p
+      end
+    end
+    first = false
+  end
+  if #parts == 0 then return "/" end
+  local out = table.concat(parts, "/")
+  if abs then out = "/" .. out end
+  return out
+end
+
+function path.is_abs(p)
+  return p:match("^/") ~= nil
+end
+
+function path.basename(p)
+  p = p:gsub("/+$", "")
+  return p:match("[^/]+$") or p
+end
+
+function path.dirname(p)
+  p = p:gsub("/+$", "")
+  if p == "" then return "." end
+  local d = p:match("^(.*)/[^/]+$")
+  if not d then return "." end
+  if d == "" then return "/" end
+  return d
+end
+
+-- Shell-quote a value for safe use in a command. Values containing only
+-- "safe" characters are returned as-is; everything else is single-quoted.
+function path.quote(s)
+  if s == "" then return "''" end
+  if s:match("^[%w%._%/+%-:=@,]+$") then return s end
+  return "'" .. s:gsub("'", "'\\''") .. "'"
+end
+
+---------------------------------------------------------------------------
+-- Filesystem helpers
+---------------------------------------------------------------------------
+
+-- Run a shell command, streaming output to the parent. Returns true on
+-- exit status 0. Compatible with Lua 5.1 through 5.4.
+function path.run(cmd)
+  local a, b, c = os.execute(cmd)
+  if type(a) == "number" then return a == 0 end
+  return a == true and b == "exit" and c == 0
+end
+
+-- mkdir -p wrapper.
+function path.mkdir_p(dir)
+  if dir == "" or dir == "/" then return true end
+  return path.run("mkdir -p " .. path.quote(dir))
+end
+
+-- True if a file or directory (or dangling symlink) exists.
+function path.exists(p)
+  local f = io.open(p, "rb")
+  if f then
+    f:close()
+    return true
+  end
+  return path.run("test -e " .. path.quote(p) .. " -o -L " .. path.quote(p))
+end
+
+-- Package names must be tightly constrained (alphanumeric, dots, underscores,
+-- plus, hyphen). No slashes, no leading dots, no other special characters.
+function path.sanitize_name(name)
+  if type(name) ~= "string" then return nil end
+  if name == "" then return nil end
+  if name:match("^%.") then return nil end
+  if not name:match("^[%w%._+%-]+$") then return nil end
+  return name
+end
+
+---------------------------------------------------------------------------
+-- Download / tool detection
+---------------------------------------------------------------------------
+
+-- True if the given command is available on PATH.
+function path.have(cmd)
+  local f = io.popen("command -v " .. cmd .. " 2>/dev/null")
+  if not f then return false end
+  local out = f:read("*l")
+  f:close()
+  return out ~= nil and out ~= ""
+end
+
+-- Capture stdout of a command. Returns output string or nil on failure.
+function path.capture(cmd)
+  local f = io.popen(cmd .. " 2>/dev/null")
+  if not f then return nil end
+  local out = f:read("*a")
+  f:close()
+  return out
+end
+
+return path

toolchain/lib/recipe.lua

@@ -0,0 +1,226 @@
+-- recipe.lua -- loading and validation of declarative .recipe files.
+--
+-- A recipe is a Lua file returning a table. It is purely data — no functions,
+-- no side effects. The recipe describes *what* to build; zeta-makepkg handles
+-- the *how*. This keeps recipes readable, reviewable, and safe to execute.
+--
+--   return {
+--     name         = "mypkg",
+--     version      = "1.2.3",
+--     summary      = "Short description",
+--     url          = "https://.../mypkg-1.2.3.tar.gz",
+--     sha256       = nil,            -- optional source checksum
+--     deps         = { "libfoo" },
+--     build_system = "meson",       -- autotools | cmake | meson | make | cargo | custom
+--     configure_args = { ... },     -- optional extra args
+--     build_script  = "build.sh",   -- required for custom
+--     test         = "test -f ${DESTDIR}/usr/bin/mypkg",
+--     files        = { "usr/bin/mypkg" },
+--   }
+
+local recipe = {}
+
+local path = require("path")
+local log  = require("log")
+
+local KNOWN_KEYS = {
+  name = true, version = true, summary = true, url = true,
+  sha256 = true, deps = true, build_system = true,
+  configure_args = true, build_script = true, test = true, files = true,
+}
+
+local BUILD_SYSTEMS = {
+  autotools = true, cmake = true, meson = true,
+  make = true, cargo = true, custom = true,
+}
+
+local HEX64 = "^" .. string.rep("%x", 64) .. "$"
+
+---------------------------------------------------------------------------
+-- Normalization & validation
+---------------------------------------------------------------------------
+
+function recipe.normalize(raw)
+  if type(raw) ~= "table" then
+    error("recipe must return a table", 2)
+  end
+
+  -- name (required, must be a valid package name)
+  local name = raw.name
+  if type(name) ~= "string" or not path.sanitize_name(name) then
+    error("recipe: missing or invalid package name", 2)
+  end
+
+  -- version (required, non-empty)
+  local version = raw.version
+  if type(version) ~= "string" or version == "" then
+    error(("recipe %q: version is required and must be a non-empty string"):format(name), 2)
+  end
+
+  -- summary (required)
+  local summary = raw.summary
+  if type(summary) ~= "string" or summary == "" then
+    error(("recipe %q: summary is required"):format(name), 2)
+  end
+
+  -- url (required, must be a string)
+  local url = raw.url
+  if type(url) ~= "string" or url == "" then
+    error(("recipe %q: url is required"):format(name), 2)
+  end
+
+  -- sha256 (optional, must be 64 hex chars if present)
+  local sha256 = nil
+  if raw.sha256 ~= nil then
+    if type(raw.sha256) ~= "string" or not raw.sha256:lower():match(HEX64) then
+      error(("recipe %q: sha256 must be exactly 64 hex characters or nil"):format(name), 2)
+    end
+    sha256 = raw.sha256:lower()
+  end
+
+  -- deps (optional, list of strings)
+  local deps = {}
+  if raw.deps ~= nil then
+    if type(raw.deps) ~= "table" then
+      error(("recipe %q: deps must be a list of strings"):format(name), 2)
+    end
+    for _, d in ipairs(raw.deps) do
+      if type(d) ~= "string" or d == "" then
+        error(("recipe %q: each dep must be a non-empty string"):format(name), 2)
+      end
+      deps[#deps + 1] = d
+    end
+  end
+
+  -- build_system (required, must be valid)
+  local build_system = raw.build_system
+  if type(build_system) ~= "string" or not BUILD_SYSTEMS[build_system] then
+    error(("recipe %q: build_system must be one of: %s"):format(
+      name, table.concat(sorted_keys(BUILD_SYSTEMS), ", ")), 2)
+  end
+
+  -- configure_args (optional, list of strings)
+  local configure_args = {}
+  if raw.configure_args ~= nil then
+    if type(raw.configure_args) ~= "table" then
+      error(("recipe %q: configure_args must be a list of strings"):format(name), 2)
+    end
+    for _, a in ipairs(raw.configure_args) do
+      configure_args[#configure_args + 1] = tostring(a)
+    end
+  end
+
+  -- build_script (required for custom, ignored otherwise)
+  local build_script = nil
+  if raw.build_script ~= nil then
+    if type(raw.build_script) ~= "string" or raw.build_script == "" then
+      error(("recipe %q: build_script must be a non-empty string"):format(name), 2)
+    end
+    build_script = raw.build_script
+  end
+  if build_system == "custom" and not build_script then
+    error(("recipe %q: build_script is required when build_system is 'custom'"):format(name), 2)
+  end
+
+  -- test (optional, shell command string)
+  local test_cmd = nil
+  if raw.test ~= nil then
+    if type(raw.test) ~= "string" or raw.test == "" then
+      error(("recipe %q: test must be a non-empty shell command string"):format(name), 2)
+    end
+    test_cmd = raw.test
+  end
+
+  -- files (optional, whitelist of relative paths)
+  local files = nil
+  if raw.files ~= nil then
+    if type(raw.files) ~= "table" then
+      error(("recipe %q: files must be a list of relative paths"):format(name), 2)
+    end
+    files = {}
+    for _, f in ipairs(raw.files) do
+      if type(f) ~= "string" or f == "" then
+        error(("recipe %q: each files entry must be a non-empty string"):format(name), 2)
+      end
+      local rel = f:gsub("^/*", ""):gsub("/+$", "")
+      if rel == "" then
+        error(("recipe %q: files entry %q is invalid"):format(name, f), 2)
+      end
+      files[#files + 1] = rel
+    end
+  end
+
+  -- Flag unknown fields
+  for k in pairs(raw) do
+    if not KNOWN_KEYS[k] then
+      log.warn(("recipe %q: unknown field %q (ignored)"):format(name, tostring(k)))
+    end
+  end
+
+  return {
+    name          = name,
+    version       = version,
+    summary       = summary,
+    url           = url,
+    sha256        = sha256,
+    deps          = deps,
+    build_system  = build_system,
+    configure_args = configure_args,
+    build_script   = build_script,
+    test          = test_cmd,
+    files         = files,
+  }
+end
+
+---------------------------------------------------------------------------
+-- Loading
+---------------------------------------------------------------------------
+
+function recipe.load(filepath)
+  local f, err = io.open(filepath, "rb")
+  if not f then
+    return nil, ("cannot open recipe %q: %s"):format(filepath, tostring(err))
+  end
+  local src = f:read("*a")
+  f:close()
+
+  -- Recipes run in a minimal environment — they're pure data, but we still
+  -- lock down globals to prevent accidental side effects.
+  local env = {}
+  local chunk
+  if setfenv then
+    chunk, err = loadstring(src, "@" .. filepath)
+    if chunk then setfenv(chunk, env) end
+  else
+    chunk, err = load(src, "@" .. filepath, "t", env)
+  end
+  if not chunk then
+    return nil, ("recipe %q: syntax error: %s"):format(filepath, tostring(err))
+  end
+
+  local ok, raw = pcall(chunk)
+  if not ok then
+    return nil, ("recipe %q: runtime error: %s"):format(filepath, tostring(raw))
+  end
+
+  local ok2, normalized = pcall(recipe.normalize, raw)
+  if not ok2 then
+    return nil, ("recipe %q: " .. tostring(normalized)):format(filepath)
+  end
+
+  log.ok(("loaded recipe %s-%s"):format(normalized.name, normalized.version))
+  return normalized
+end
+
+---------------------------------------------------------------------------
+-- Helpers
+---------------------------------------------------------------------------
+
+function sorted_keys(t)
+  local keys = {}
+  for k in pairs(t) do keys[#keys + 1] = k end
+  table.sort(keys)
+  return keys
+end
+
+return recipe