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#!/usr/bin/env python3

import os
import tempfile
import subprocess
from pathlib import Path

if __name__ == '__main__':
    with tempfile.TemporaryDirectory() as tmpdir:

        current_branch = subprocess.run(['git', 'symbolic-ref', '-q', 'HEAD'], check=False, capture_output=True).stdout.strip()
        if current_branch == 'refs/heads/deploy':
            raise SystemError('This script cannot be run from the deploy branch (run from main instead)')

        subprocess.run(['git', 'worktree', 'add', '--detach', tmpdir], check=True)
        try:
            env = dict(os.environ)
            env['PATH'] = f'{Path("hack").absolute()}:{env["PATH"]}'
            subprocess.run(['hugo'], cwd=tmpdir, check=True, env=env)
            subprocess.run(['git', 'add', '--force', 'public'], cwd=tmpdir, check=True)
            write_tree = subprocess.run(['git', 'write-tree', '--prefix=public/'], cwd=tmpdir, check=True, capture_output=True)
            tree = write_tree.stdout.strip()
        
            commit = subprocess.run(['git', 'commit-tree', '-p', 'HEAD', '-p', 'refs/heads/deploy', '-m', 'deploy.py auto-commit', tree], cwd=tmpdir, check=True, capture_output=True).stdout.strip()
            subprocess.run(['git', 'update-ref', '-m', f'deploy.sh update deploy branch to {commit}', 'refs/heads/deploy', commit], cwd=tmpdir, check=True)

            subprocess.run(['git', 'push', 'git@git.jaseg.de:blog.git', 'deploy'], cwd=tmpdir, check=True)
        finally:
            subprocess.run(['git', 'worktree', 'remove', '-f', tmpdir], check=True)