diff options
Diffstat (limited to 'zephyr/zmake/zmake/__main__.py')
-rw-r--r-- | zephyr/zmake/zmake/__main__.py | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/zephyr/zmake/zmake/__main__.py b/zephyr/zmake/zmake/__main__.py index 74845d9bbc..a50ca3b08d 100644 --- a/zephyr/zmake/zmake/__main__.py +++ b/zephyr/zmake/zmake/__main__.py @@ -6,6 +6,7 @@ import argparse import inspect import logging +import os import pathlib import sys @@ -13,6 +14,55 @@ import zmake.multiproc as multiproc import zmake.zmake as zm +def maybe_reexec(argv): + """Re-exec zmake from the EC source tree, if possible and desired. + + Zmake installs into the users' chroot, which makes it convenient + to execute, but can sometimes become tedious when zmake changes + land and users haven't upgraded their chroots yet. + + We can partially subvert this problem by re-execing zmake from the + source if it's available. This won't make it so developers never + need to upgrade their chroots (e.g., a toolchain upgrade could + require chroot upgrades), but at least makes it slightly more + convenient for an average repo sync. + + Args: + argv: The argument list passed to the main function, not + including the executable path. + + Returns: + None, if the re-exec did not happen, or never returns if the + re-exec did happen. + """ + # We only re-exec if we are inside of a chroot (since if installed + # standalone using pip, there's already an "editable install" + # feature for that in pip.) + env = dict(os.environ) + srcroot = env.get("CROS_WORKON_SRCROOT") + if not srcroot: + return + + # If for some reason we decide to move zmake in the future, then + # we don't want to use the re-exec logic. + zmake_path = ( + pathlib.Path(srcroot) / "src" / "platform" / "ec" / "zephyr" / "zmake" + ).resolve() + if not zmake_path.is_dir(): + return + + # If PYTHONPATH is set, it is either because we just did a + # re-exec, or because the user wants to run a specific copy of + # zmake. In either case, we don't want to re-exec. + if "PYTHONPATH" in env: + return + + # Set PYTHONPATH so that we run zmake from source. + env["PYTHONPATH"] = str(zmake_path) + + os.execve(sys.executable, [sys.executable, "-m", "zmake", *argv], env) + + def call_with_namespace(func, namespace): """Call a function with arguments applied from a Namespace. @@ -55,6 +105,8 @@ def main(argv=None): if argv is None: argv = sys.argv[1:] + maybe_reexec(argv) + parser = argparse.ArgumentParser() parser.add_argument( "--checkout", type=pathlib.Path, help="Path to ChromiumOS checkout" |