Support --layout packed PEX injection.

CHANGES.md

@@ -1,5 +1,9 @@
 # Release Notes
 
+## 0.2.0
+
+Add support for injecting `--layout packed` PEXes.
+
 ## 0.1.0 
 
 Initial release.

Cargo.toml

@@ -1,6 +1,12 @@
 # Copyright 2026 Pex project contributors.
 # SPDX-License-Identifier: Apache-2.0
 
+[package]
+name = "pexrc"
+version = "0.2.0"
+edition = "2024"
+publish = false
+
 [workspace]
 members = [
     ".",
@@ -10,20 +16,14 @@ members = [
     "crates/interpreter",
     "crates/package",
     "crates/pex",
-    "crates/pexrc-build-system",
+    "crates/build-system",
     "crates/pexrs",
     "crates/platform",
-    "crates/resources",
+    "crates/scripts",
     "crates/testing",
     "crates/venv",
 ]
 
-[package]
-name = "pexrc"
-version = "0.1.0"
-edition = "2024"
-publish = false
-
 [package.metadata.build]
 zig_version = "0.15.2"
 
@@ -140,16 +140,17 @@ textwrap = "0.16"
 time = "0.3"
 toml = "1.0"
 url = "2.5"
+walkdir = "2.5"
 which = "8.0"
 xz2 = "0.1"
 zip = { version = "8.1", default-features = false, features = ["deflate", "zstd"] }
 zstd = "0.13"
 
 [build-dependencies]
 anyhow = { workspace = true }
+build-system = { path = "crates/build-system" }
 bstr = { workspace = true }
 fs-err = { workspace = true }
-pexrc-build-system = { path = "crates/pexrc-build-system" }
 env_logger = { workspace = true }
 itertools = { workspace = true }
 zstd = { workspace = true }
@@ -173,9 +174,10 @@ owo-colors = { workspace = true }
 pex = { path = "crates/pex" }
 pexrs = { path = "crates/pexrs" }
 platform = { path = "crates/platform" }
-resources = { path = "crates/resources", features = ["embedded"] }
+scripts = { path = "crates/scripts", features = ["embedded"] }
 sha2 = { workspace = true }
 strum = { workspace = true }
 tempfile = { workspace = true }
+walkdir = { workspace = true }
 zip = { workspace = true }
 zstd = { workspace = true }

build.rs

@@ -4,20 +4,21 @@
 use std::ffi::OsStr;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
-use std::{env, fs, io, iter};
+use std::{env, io, iter};
 
 use anyhow::{anyhow, bail};
 use bstr::ByteSlice;
-use fs_err::File;
-use itertools::Itertools;
-use pexrc_build_system::{
+use build_system::{
     ClassifiedTargets,
     ClibConfiguration,
     FoundTool,
     Target,
     classify_targets,
     ensure_tools_installed,
 };
+use fs_err as fs;
+use fs_err::File;
+use itertools::Itertools;
 
 fn main() -> anyhow::Result<()> {
     println!("cargo::rerun-if-changed=crates");

crates/boot/src/boot.py

@@ -1,6 +1,6 @@
+# -*- coding: utf-8 -*-
 # Copyright 2026 Pex project contributors.
 # SPDX-License-Identifier: Apache-2.0
-# -*- coding: utf-8 -*-
 
 from __future__ import print_function
 
@@ -437,22 +437,38 @@ def boot(
 def _load_pexrc():
     # type: () -> Pexrc
 
-    dll = None  # type: Optional[Pexrc]
+    prefix = ".clib" if __name__ == "__pex__" else os.path.join("__pex__", ".clib")
     target_triple = CURRENT_OS.target_triple(arch=CURRENT_ARCH, abi=CURRENT_ABI)
     library_file_name = CURRENT_OS.library_file_name(lib_name="pexrc")
+    library_file_relpath = os.path.join(
+        prefix,
+        "{target_triple}.{library_file_name}".format(
+            target_triple=target_triple, library_file_name=library_file_name
+        ),
+    )
+    if __file__ and os.path.isfile(__file__):
+        # We're in a either a loose or packed PEX.
+        library_file_path = os.path.join(os.path.dirname(__file__), library_file_relpath)
+        if not os.path.exists(library_file_path):
+            raise RuntimeError(
+                "Pexrc is not supported on {target_triple}: no pexrc library found.".format(
+                    target_triple=target_triple,
+                )
+            )
+        try:
+            return cdll.LoadLibrary(library_file_path)  # type: Pexrc
+        except OSError as e:
+            raise RuntimeError(
+                "Failed to load pexrc library from {library_file_path}: {err}".format(
+                    library_file_path=library_file_path, err=e
+                )
+            )
+
+    dll = None  # type: Optional[Pexrc]
     tmp_dir = tempfile.mkdtemp()
-    library_file_path = os.path.join(tmp_dir, os.path.basename(library_file_name))
+    library_file_path = os.path.join(tmp_dir, library_file_name)
     try:
-        prefix = ".clib" if __name__ == "__pex__" else os.path.join("__pex__", ".clib")
-        pexrc_data = pkgutil.get_data(
-            __name__,
-            os.path.join(
-                prefix,
-                "{target_triple}.{library_file_name}".format(
-                    target_triple=target_triple, library_file_name=library_file_name
-                ),
-            ),
-        )
+        pexrc_data = pkgutil.get_data(__name__, library_file_relpath)
         if pexrc_data is None:
             raise RuntimeError(
                 "Pexrc is not supported on {target_triple}: no pexrc library found.".format(

crates/boot/src/boot.sh

@@ -1,15 +1,19 @@
 #!/bin/sh
+# -*- coding: utf-8 -*-
+# Copyright 2026 Pex project contributors.
+# SPDX-License-Identifier: Apache-2.0
+# --- split --- #
 
 # N.B.: This script should stick to syntax defined for POSIX `sh` and avoid non-builtins.
 # See: https://pubs.opengroup.org/onlinepubs/9699919799/idx/shell.html
 set -eu
 
-# --- vars --- #
+# --- split --- #
 # N.B.: These vars are templated in by pexrc when it injects a PEX with its runtime.
 RAW_DEFAULT_PEXRC_ROOT="{pexrc_root}"
 VENV_RELPATH="{venv_relpath}"
 PYTHONS="{pythons}"
-# --- vars --- #
+# --- split --- #
 
 # N.B.: The SC2116 warning suppressions below are in place to ensure tilde-expansion of the
 # DEFAULT_PEX_ROOT value which is necessary for the -x check of the venv pex to succeed when it