#!/usr/bin/env python3
"""Install the explicit owned inventory; replace files without following symlinks."""
import argparse
import os
from pathlib import Path
import shutil
import tempfile
from install_layout import arguments, inventory, layout, staged

parser = argparse.ArgumentParser(description=__doc__)
arguments(parser)
parser.add_argument('--build-dir', type=Path, required=True)
parser.add_argument('--gui', action='store_true')
args = parser.parse_args()
source = Path(__file__).resolve().parent.parent
entries = []
for destination, original in inventory(source, layout(args)):
    name = destination.name
    if name == 'BINARY_MANIFEST.json' or (not args.gui and name in ('xtc', 'xtc.desktop')):
        continue
    if original is None:
        original = args.build_dir / name
    destination = staged(destination, args.destdir)
    if not original.is_file():
        raise ValueError(f'Missing install input: {original}')
    if destination.exists() and not (destination.is_file() or destination.is_symlink()):
        raise ValueError(f'Refusing non-file destination: {destination}')
    entries.append((destination, original))
for destination, original in entries:
    destination.parent.mkdir(parents=True, exist_ok=True)
    fd, pending = tempfile.mkstemp(prefix='.xtc-install-', dir=destination.parent)
    try:
        with os.fdopen(fd, 'wb') as output, original.open('rb') as input_file:
            shutil.copyfileobj(input_file, output)
            os.fchmod(output.fileno(), 0o755 if destination.name in ('xtc', 'xtc-check') else 0o644)
        os.replace(pending, destination)
    finally:
        Path(pending).unlink(missing_ok=True)