#!/usr/bin/env python3
"""Apply ordinary data/script permissions in the private installation prefix."""
from pathlib import Path
for p in Path('debian/tmp').rglob('*'):
    if p.is_symlink() or not p.is_file():continue
    if p.suffix=='.desktop':p.chmod(0o644)
    elif p.suffix in ('.py','.sh'):
        with p.open('rb') as f:head=f.read(128)
        if head.startswith(b'#!'):p.chmod(0o755)

# Debian's canonical Bash interpreter path also applies under the private prefix.
for p in Path('debian/tmp').rglob('*'):
    if p.is_symlink() or not p.is_file() or not (p.stat().st_mode & 0o111):continue
    with p.open('rb') as stream:first=stream.readline(256)
    if first.rstrip(b'\r\n')==b'#!/usr/bin/bash' or first.startswith(b'#!/usr/bin/bash '):
        data=p.read_bytes();p.write_bytes(b'#!/bin/bash'+data[len(b'#!/usr/bin/bash'):])