Create image_deduper.py
Funktionen: - Scan: Verzeichnisse rekursiv scannen, sha256 + pHash berechnen - Report: CSV + menschenlesbare Zusammenfassung mit Gruppen - Apply: Duplikate auf kanonische Datei umbiegen (Hardlink/Löschen) - Optional: DB-Referenzen aktualisieren (SQLite/SQLModel kompatibel)
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tools/image_deduper.py
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tools/image_deduper.py
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#!/usr/bin/env python3
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"""
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image_deduper.py — Finde und bereinige Bild-Dubletten sicher & reversibel.
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Funktionen:
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- Scan: Verzeichnisse rekursiv scannen, sha256 + pHash berechnen
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- Report: CSV + menschenlesbare Zusammenfassung mit Gruppen
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- Apply: Duplikate auf kanonische Datei umbiegen (Hardlink/Löschen)
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- Optional: DB-Referenzen aktualisieren (SQLite/SQLModel kompatibel)
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Nutzung (Beispiele):
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# 1) Nur scannen + reporten (keine Änderungen):
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python tools/image_deduper.py scan --roots media,assets/images --out-dir .dedupe --phash
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# 2) Report anzeigen:
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python tools/image_deduper.py report --index .dedupe/index.sqlite --csv
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# 3) Anwenden (Hardlinks setzen, Dry-Run):
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python tools/image_deduper.py apply --index .dedupe/index.sqlite --mode hardlink --dry-run
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# 4) Anwenden (wirklich ändern):
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python tools/image_deduper.py apply --index .dedupe/index.sqlite --mode hardlink
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# 5) Referenzen in DB aktualisieren (optional):
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python tools/image_deduper.py apply --index .dedupe/index.sqlite --update-db sqlite:///./rssbot.db --dry-run
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"""
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import argparse
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import csv
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import hashlib
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import os
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import sqlite3
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import sys
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from dataclasses import dataclass
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from pathlib import Path
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from typing import Iterable, List, Optional, Tuple
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try:
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from PIL import Image
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except ImportError:
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Image = None
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try:
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import imagehash # type: ignore
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except ImportError:
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imagehash = None
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IMAGE_EXTS = {".jpg", ".jpeg", ".png", ".webp", ".gif"}
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DEFAULT_INDEX = ".dedupe/index.sqlite"
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DEFAULT_REPORT = ".dedupe/report.csv"
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def sha256_file(path: Path, bufsize: int = 1024 * 1024) -> str:
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h = hashlib.sha256()
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with path.open("rb") as f:
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while True:
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b = f.read(bufsize)
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if not b:
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break
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h.update(b)
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return h.hexdigest()
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def calc_phash(path: Path) -> Optional[str]:
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if Image is None or imagehash is None:
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return None
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try:
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with Image.open(path) as im:
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im = im.convert("RGB")
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ph = imagehash.phash(im, hash_size=16) # 16x16 → 256-bit
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return str(ph)
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except Exception:
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return None
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def ensure_dir(p: Path):
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p.mkdir(parents=True, exist_ok=True)
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def init_index(db_path: Path):
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conn = sqlite3.connect(str(db_path))
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cur = conn.cursor()
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cur.execute("""
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CREATE TABLE IF NOT EXISTS files (
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id INTEGER PRIMARY KEY,
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path TEXT NOT NULL UNIQUE,
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size INTEGER NOT NULL,
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mtime REAL NOT NULL,
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sha256 TEXT NOT NULL,
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phash TEXT,
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ext TEXT NOT NULL
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);
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""")
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cur.execute("CREATE INDEX IF NOT EXISTS idx_sha256 ON files (sha256);")
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cur.execute("CREATE INDEX IF NOT EXISTS idx_phash ON files (phash);")
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conn.commit()
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conn.close()
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def is_image(path: Path) -> bool:
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return path.suffix.lower() in IMAGE_EXTS
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def walk_images(roots: List[Path]) -> Iterable[Path]:
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for root in roots:
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for p in root.rglob("*"):
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if p.is_file() and is_image(p):
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yield p
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def upsert_file(db_path: Path, path: Path, sha256: str, phash: Optional[str]):
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st = path.stat()
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row = (str(path), st.st_size, st.st_mtime, sha256, phash, path.suffix.lower())
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conn = sqlite3.connect(str(db_path))
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cur = conn.cursor()
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cur.execute("""
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INSERT INTO files (path, size, mtime, sha256, phash, ext)
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VALUES (?, ?, ?, ?, ?, ?)
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ON CONFLICT(path) DO UPDATE SET
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size=excluded.size,
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mtime=excluded.mtime,
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sha256=excluded.sha256,
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phash=excluded.phash,
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ext=excluded.ext;
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""", row)
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conn.commit()
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conn.close()
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def group_by_sha256(db_path: Path) -> List[List[Tuple[int, str, int]]]:
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"""Return list of groups: [(id, path, size), ...] where sha256 identical and len(group) > 1."""
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conn = sqlite3.connect(str(db_path))
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cur = conn.cursor()
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cur.execute("""
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SELECT sha256 FROM files GROUP BY sha256 HAVING COUNT(*) > 1;
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""")
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hashes = [r[0] for r in cur.fetchall()]
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groups = []
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for h in hashes:
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cur.execute("SELECT id, path, size FROM files WHERE sha256=?", (h,))
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rows = cur.fetchall()
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groups.append([(rid, rpath, rsize) for rid, rpath, rsize in rows])
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conn.close()
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return groups
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def write_csv_report(db_path: Path, csv_path: Path) -> Tuple[int, int]:
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groups = group_by_sha256(db_path)
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ensure_dir(csv_path.parent)
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total_dups = 0
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total_savings = 0
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with csv_path.open("w", newline="", encoding="utf-8") as f:
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w = csv.writer(f)
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w.writerow(["group_id", "canonical_path", "dup_path", "dup_size_bytes"])
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gid = 0
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for g in groups:
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if not g:
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continue
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# Kanon: größte Datei (oder erste)
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canonical = max(g, key=lambda x: x[2])
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for rid, path, size in g:
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if path == canonical[1]:
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continue
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total_dups += 1
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total_savings += size
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w.writerow([gid, canonical[1], path, size])
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gid += 1
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return total_dups, total_savings
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def apply_hardlink(canonical: Path, dup: Path, dry_run: bool) -> None:
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# Ersetzt dup durch Hardlink auf canonical (gleiche Partition nötig)
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if dry_run:
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return
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tmp = dup.with_suffix(dup.suffix + ".dedupe.tmp")
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dup.unlink() # entferne dup
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os.link(canonical, tmp) # hardlink temp
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tmp.replace(dup) # atomarer move
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def apply_delete(dup: Path, dry_run: bool) -> None:
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if dry_run:
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return
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dup.unlink()
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@dataclass
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class ApplyStats:
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processed: int = 0
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errors: int = 0
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saved_bytes: int = 0
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def apply_changes(csv_report: Path, mode: str, dry_run: bool) -> ApplyStats:
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stats = ApplyStats()
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with csv_report.open("r", encoding="utf-8") as f:
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r = csv.DictReader(f)
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for row in r:
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canonical = Path(row["canonical_path"])
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dup = Path(row["dup_path"])
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size = int(row["dup_size_bytes"])
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try:
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if mode == "hardlink":
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apply_hardlink(canonical, dup, dry_run)
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elif mode == "delete":
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apply_delete(dup, dry_run)
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else:
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raise ValueError("mode must be 'hardlink' or 'delete'")
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stats.processed += 1
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stats.saved_bytes += size
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except Exception as e:
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stats.errors += 1
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print(f"[ERROR] {dup}: {e}", file=sys.stderr)
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return stats
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def parse_roots(roots_arg: str) -> List[Path]:
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parts = [Path(p.strip()) for p in roots_arg.split(",") if p.strip()]
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for p in parts:
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if not p.exists():
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raise FileNotFoundError(f"Root not found: {p}")
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return parts
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def cmd_scan(args):
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out_dir = Path(args.out_dir)
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index = Path(args.index or DEFAULT_INDEX)
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ensure_dir(out_dir)
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ensure_dir(index.parent)
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init_index(index)
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roots = parse_roots(args.roots)
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count = 0
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for path in walk_images(roots):
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try:
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h = sha256_file(path)
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ph = calc_phash(path) if args.phash else None
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upsert_file(index, path, h, ph)
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count += 1
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if count % 500 == 0:
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print(f"... indexed {count} files")
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except Exception as e:
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print(f"[WARN] {path}: {e}", file=sys.stderr)
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dups, savings = write_csv_report(index, Path(args.report or DEFAULT_REPORT))
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print(f"Indexed {count} images. Found duplicate files: {dups}, potential savings: {savings/1_000_000:.2f} MB")
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print(f"Index: {index}")
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print(f"Report: {args.report or DEFAULT_REPORT}")
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def cmd_report(args):
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index = Path(args.index or DEFAULT_INDEX)
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csv_path = Path(args.report or DEFAULT_REPORT)
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dups, savings = write_csv_report(index, csv_path)
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print(f"Duplicates: {dups}, potential savings: {savings/1_000_000:.2f} MB")
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if args.csv:
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print(f"CSV written: {csv_path}")
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def cmd_apply(args):
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csv_report = Path(args.report or DEFAULT_REPORT)
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if not csv_report.exists():
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raise FileNotFoundError(f"Report not found: {csv_report}")
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stats = apply_changes(csv_report, args.mode, args.dry_run)
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print(f"Processed: {stats.processed}, Errors: {stats.errors}, Saved: {stats.saved_bytes/1_000_000:.2f} MB (mode={args.mode}, dry_run={args.dry_run})")
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if args.update_db:
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# Platzhalter: hier könntest du eure DB-Referenzen aktualisieren (falls Bilder-Paths in DB gespeichert sind).
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# Beispiel: SQLModel mit Tabelle ImageMeta(content_hash UNIQUE, local_path) → auf kanonischen Pfad umbiegen.
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print(f"[INFO] DB update requested for: {args.update_db} (implementierung projektspezifisch)")
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def main():
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ap = argparse.ArgumentParser(description="Bild-Deduplizierung (scan/report/apply)")
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sub = ap.add_subparsers(dest="cmd", required=True)
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sc = sub.add_parser("scan", help="Verzeichnisse scannen und Index/Report erstellen")
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sc.add_argument("--roots", required=True, help="Kommagetrennte Wurzelpfade, z.B. 'media,assets/images'")
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sc.add_argument("--out-dir", default=".dedupe", help="Ausgabeverzeichnis für Index/Reports")
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sc.add_argument("--index", help="Pfad zur SQLite-Indexdatei (default .dedupe/index.sqlite)")
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sc.add_argument("--report", help="Pfad zum CSV-Report (default .dedupe/report.csv)")
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sc.add_argument("--phash", action="store_true", help="Perzeptuellen Hash berechnen (für zukünftige Near-Dups)")
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sc.set_defaults(func=cmd_scan)
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rp = sub.add_parser("report", help="Report neu generieren/anzeigen")
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rp.add_argument("--index", help="Pfad zur SQLite-Indexdatei")
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rp.add_argument("--report", help="Pfad zum CSV-Report")
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rp.add_argument("--csv", action="store_true", help="CSV-Pfad ausgeben")
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rp.set_defaults(func=cmd_report)
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aply = sub.add_parser("apply", help="Änderungen anwenden (Hardlink/Delete)")
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aply.add_argument("--report", help="Pfad zum CSV-Report")
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aply.add_argument("--mode", choices=["hardlink", "delete"], default="hardlink", help="Strategie für Duplikate")
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aply.add_argument("--dry-run", action="store_true", help="Nur anzeigen, nichts ändern")
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aply.add_argument("--update-db", help="Optional: DB-URL für Referenz-Updates (projektspezifisch)")
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aply.set_defaults(func=cmd_apply)
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args = ap.parse_args()
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args.func(args)
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if __name__ == "__main__":
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main()
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