GPT-6.1 Sol (effort default (no reasoning-effort override) · thinking on) on Make a unified-diff patch applier correct (offset search, no-newline markers, create/delete, atomic failure)

{"type": "thread.started", "thread_id": "01a16445-46ff-7670-a381-18b1d6aa1983"}
{"type": "turn.started"}
{"type": "item.completed", "item": {"id": "item_0", "type": "agent_message", "text": "I\u2019ll read the patch rules and implementation, then fix the applier and check failure cases for an unchanged tree."}}
{"type": "item.started", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc \"pwd && rg --files -g 'AGENTS.md' -g 'PATCH_RULES.md' -g 'patcher.py' -g '*test*'\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_1", "type": "command_execution", "command": "/bin/bash -lc \"pwd && rg --files -g 'AGENTS.md' -g 'PATCH_RULES.md' -g 'patcher.py' -g '*test*'\"", "aggregated_output": "/home/bob/usecase-runs/batch/out/gpt-6.1-sol/182_g03/work\npatcher.py\nPATCH_RULES.md\n", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat PATCH_RULES.md patcher.py'", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_2", "type": "command_execution", "command": "/bin/bash -lc 'cat PATCH_RULES.md patcher.py'", "aggregated_output": "# Patch rules for apply_patch(diff_text, root)\n\n1. Sections. A diff contains one or more file sections. A section starts with a line `--- <old path>` immediately followed by `+++ <new path>`, then one or more hunks. Any other line outside a hunk (e.g. `diff --git ...`, `index ...`, free text) is ignored. Each file appears in at most one section.\n2. Paths. Cut the path at the first TAB (anything after it, such as a timestamp, is ignored). If the path starts with `a/` or `b/`, remove that prefix. The path is relative to `root`. An absolute path or a path with a `..` component raises `PatchError`. The path used for a section is the `+++` path, or the `---` path when `+++` is `/dev/null`.\n3. Create / delete. `--- /dev/null` creates a new file (`PatchError` if it already exists; missing parent directories are created). `+++ /dev/null` deletes the file: its hunk's removed lines must equal the whole file exactly. Any other section modifies an existing file (`PatchError` if it does not exist).\n4. Hunks. Header: `@@ -<old start>[,<old count>] +<new start>[,<new count>] @@` followed by optional text. An omitted count means 1. Body lines start with ` ` (context), `-` (removed) or `+` (added). A completely empty line inside a hunk counts as a context line whose content is empty. The line `\\ No newline at end of file` means the line just before it has no trailing newline. If the number of context+removed lines differs from the old count, or context+added lines differs from the new count, raise `PatchError`.\n5. Matching. A file is a sequence of lines, each including its `\\n` (the last line may lack it). The hunk's old lines (context + removed, in order) must equal consecutive file lines exactly, including whether the final line has a newline. `\\r` is ordinary content. No fuzz: context is never ignored.\n6. Position. Hunks of a file are applied in order to the progressively patched content. Let `base` = `old start - 1` (or `old start` when old count is 0, meaning \"insert after that line\") plus the net number of lines added by earlier hunks of this file. A hunk's expected index (0-based) is `base` plus the previous hunk's offset (0 for the first hunk), where a hunk's offset = the index where it actually matched minus its own `base`. If the old lines do not match at the expected index, try the expected index +1, -1, +2, -2, ... up to +/-50 and use the first that matches. A hunk may never match at an index before the end of the previous hunk's new lines. No match -> `PatchError`.\n7. Atomic. If anything fails (malformed diff, missing file, mismatch, bad path), raise `PatchError` and leave every file and directory under `root` exactly as it was: nothing modified, created or deleted.\n8. Result. On success return a dict mapping each section's path (after rule 2) to `\"created\"`, `\"modified\"` or `\"deleted\"`. A diff with no sections raises `PatchError`.\n\"\"\"Apply unified diffs.\"\"\"\nimport os, re\n\n\nclass PatchError(Exception):\n    pass\n\n\ndef apply_patch(diff_text, root):\n    lines = diff_text.splitlines()\n    result = {}\n    i = 0\n    while i < len(lines):\n        if lines[i].startswith(\"--- \") and i + 1 < len(lines) and lines[i + 1].startswith(\"+++ \"):\n            path = lines[i + 1][4:].strip()[2:]\n            full = os.path.join(root, path)\n            content = open(full).read().splitlines()\n            i += 2\n            while i < len(lines) and lines[i].startswith(\"@@\"):\n                m = re.match(r\"@@ -(\\d+),(\\d+) \\+(\\d+),(\\d+) @@\", lines[i])\n                start = int(m[1]) - 1\n                i += 1\n                old, new = [], []\n                while i < len(lines) and lines[i][:1] in (\" \", \"-\", \"+\"):\n                    if lines[i].startswith(\"--- \"):\n                        break\n                    t, s = lines[i][0], lines[i][1:]\n                    if t in \" -\":\n                        old.append(s)\n                    if t in \" +\":\n                        new.append(s)\n                    i += 1\n                if content[start:start + len(old)] != old:\n                    raise PatchError(f\"hunk failed in {path}\")\n                content[start:start + len(old)] = new\n                with open(full, \"w\") as f:\n                    f.write(\"\\n\".join(content) + \"\\n\")\n            result[path] = \"modified\"\n        else:\n            i += 1\n    return result\n", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_3", "type": "agent_message", "text": "The current code loses newline details and writes each hunk immediately, so a later failure can leave earlier changes in place. I\u2019ll validate and apply every section in memory before changing files, preserving exact line bytes and following the specified offset search."}}
{"type": "item.started", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc \"cat > patcher.py <<'PY'\n\\\"\\\"\\\"Apply unified diffs, with exact matching and transactional file updates.\\\"\\\"\\\"\nimport os\nimport re\nimport stat\n\n\nclass PatchError(Exception):\n    pass\n\n\n_HEADER = re.compile(r\\\"@@ -(\\\\d+)(?:,(\\\\d+))? \\\\+(\\\\d+)(?:,(\\\\d+))? @@(?:.*)\"'$\")\n_MARKER = \"'\"\\\\\\\\ No newline at end of file\\\"\n\n\ndef _path(text):\n    path = text.split('\\\\t', 1)[0]\n    if path == '/dev/null':\n        return None\n    if os.path.isabs(path) or '..' in path.split('/'):\n        raise PatchError('unsafe path: ' + path)\n    if path.startswith(('a/', 'b/')):\n        path = path[2:]\n    if not path or path == '.' or not path.strip('/'):\n        raise PatchError('empty file path')\n    return path\n\n\ndef _sections(text):\n    # Split only on LF: CR and other Unicode line separators are content.\n    lines = text.split('\\\\n')\n    if lines[-1] == '':\n        lines.pop()\n    sections = []\n    seen = set()\n    i = 0\n\n    def section_at(n):\n        return (n + 1 < len(lines) and lines[n].startswith('--- ')\n                and lines[n + 1].startswith('+++ '))\n\n    while i < len(lines):\n        if not section_at(i):\n            if lines[i].startswith('@@'):\n                raise PatchError('hunk outside a section')\n            i += 1\n            continue\n        old_path, new_path = _path(lines[i][4:]), _path(lines[i + 1][4:])\n        path = new_path if new_path is not None else old_path\n        if path is None:\n            raise PatchError('both paths are /dev/null')\n        key = os.path.normpath(path)\n        if key in seen:\n            raise PatchError('duplicate section: ' + path)\n        seen.add(key)\n        hunks = []\n        i += 2\n        while i < len(lines) and not section_at(i):\n            if not lines[i].startswith('@@'):\n                i += 1\n                continue\n            match = _HEADER.fullmatch(lines[i])\n            if not match:\n                raise PatchError('malformed hunk header')\n            start, count, new_start, new_count = (\n                int(match[1]), int(match[2] or 1),\n                int(match[3]), int(match[4] or 1))\n            i += 1\n            body = []\n            old_n = new_n = 0\n            while i < len(lines):\n                line = lines[i]\n                if line == _MARKER:\n                    if not body or not body[-1][1].endswith(b'\\\\n'):\n                        raise PatchError('misplaced newline marker')\n                    body[-1] = (body[-1][0], body[-1][1][:-1])\n                    i += 1\n                    continue\n                if old_n == count and new_n == new_count and section_at(i):\n                    break\n                if line.startswith('@@'):\n                    break\n                if line == '':\n                    kind, value = ' ', ''\n                elif line[0] in ' +-':\n                    kind, value = line[0], line[1:]\n                else:\n                    break\n                body.append((kind, value.encode('utf-8', 'surrogateescape') + b'\\\\n'))\n                old_n += kind in ' -'\n                new_n += kind in ' +'\n                i += 1\n            if old_n \"'!= count or new_n != new_count:\n                raise PatchError('\"'hunk line counts do not match header')\n            hunks.append((start, count,\n                          [v for k, v in body if k in ' -'],\n                          [v for k, v in body if k in ' +']))\n        if not hunks:\n            raise PatchError('section has no hunks')\n        sections.append((path, old_path is None, new_path is None, hunks))\n    if not sections:\n        raise PatchError('diff has no sections')\n    return sections\n\n\ndef _file_lines(data):\n    parts = data.split(b'\\\\n')\n    return [p + b'\\\\n' for p in parts[:-1]] + ([parts[-1]] if parts[-1] else [])\n\n\ndef apply_patch(diff_text, root):\n    \\\"\\\"\\\"Apply all sections or raise PatchError without leaving partial changes.\\\"\\\"\\\"\n    snapshots = {}\n    changed = []\n    made_dirs = []\n    try:\n        sections = _sections(diff_text)\n        root = os.path.abspath(os.fspath(root))\n        real_root = os.path.realpath(root)\n        planned = []\n        result = {}\n        targets = set()\n        for path, create, delete, hunks in sections:\n            full = os.path.join(root, path)\n            real = os.path.realpath(full)\n            if os.path.commonpath([real_root, real]) \"'!= real_root or real == real_root:\n                raise PatchError('\"'path escapes root: ' + path)\n            if real in targets:\n                raise PatchError('duplicate target')\n            targets.add(real)\n            exists = os.path.lexists(full)\n            if create and exists:\n                raise PatchError('file already exists: ' + path)\n            if not create and not exists:\n                raise PatchError('missing file: ' + path)\n            if exists:\n                with open(full, 'rb') as stream:\n                    original = stream.read()\n                mode = stat.S_IMODE(os.stat(full).st_mode)\n            else:\n                original, mode = None, None\n            content = _file_lines(original or b'')\n            delta = offset = previous_end = 0\n            removed = []\n            for start, count, old, new in hunks:\n                base = (start if count == 0 else start - 1) + delta\n                expected = base + offset\n                candidates = [expected]\n                for distance in range(1, 51):\n                    candidates.extend((expected + distance, expected - distance))\n                for index in candidates:\n                    if (index >= previous_end and 0 <= index <= len(content)\n                            and index + len(old) <= len(content)\n                            and content[index:index + len(old)] == old):\n                        break\n                else:\n                    raise PatchError('hunk does not match: ' + path)\n                content[index:index + len(old)] = new\n                previous_end = index + len(new)\n                offset = index - base\n                delta += len(new) - len(old)\n                removed.extend(old)\n            if delete and (content or b''.join(removed) \"'!= original):\n                raise PatchError('\"'deletion does not remove the whole file')\n            snapshots[full] = (original, mode)\n            planned.append((full, None if delete else b''.join(content)))\n            result[path] = 'created' if create else 'deleted' if delete else 'modified'\n\n        for full, data in planned:\n            if data is not None:\n                parent = os.path.dirname(full)\n                missing = []\n                while not os.path.exists(parent):\n                    missing.append(parent)\n                    parent = os.path.dirname(parent)\n                for directory in reversed(missing):\n                    os.mkdir(directory)\n                    made_dirs.append(directory)\n            changed.append(full)\n            if data is None:\n                os.unlink(full)\n            else:\n                with open(full, 'wb') as stream:\n                    stream.write(data)\n        return result\n    except Exception as exc:\n        for full in reversed(changed):\n            original, mode = snapshots[full]\n            if original is None:\n                if os.path.lexists(full):\n                    os.unlink(full)\n            else:\n                with open(full, 'wb') as stream:\n                    stream.write(original)\n                os.chmod(full, mode)\n        for directory in reversed(made_dirs):\n            os.rmdir(directory)\n        if isinstance(exc, PatchError):\n            raise\n        raise PatchError(str(exc)) from exc\nPY\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_4", "type": "command_execution", "command": "/bin/bash -lc \"cat > patcher.py <<'PY'\n\\\"\\\"\\\"Apply unified diffs, with exact matching and transactional file updates.\\\"\\\"\\\"\nimport os\nimport re\nimport stat\n\n\nclass PatchError(Exception):\n    pass\n\n\n_HEADER = re.compile(r\\\"@@ -(\\\\d+)(?:,(\\\\d+))? \\\\+(\\\\d+)(?:,(\\\\d+))? @@(?:.*)\"'$\")\n_MARKER = \"'\"\\\\\\\\ No newline at end of file\\\"\n\n\ndef _path(text):\n    path = text.split('\\\\t', 1)[0]\n    if path == '/dev/null':\n        return None\n    if os.path.isabs(path) or '..' in path.split('/'):\n        raise PatchError('unsafe path: ' + path)\n    if path.startswith(('a/', 'b/')):\n        path = path[2:]\n    if not path or path == '.' or not path.strip('/'):\n        raise PatchError('empty file path')\n    return path\n\n\ndef _sections(text):\n    # Split only on LF: CR and other Unicode line separators are content.\n    lines = text.split('\\\\n')\n    if lines[-1] == '':\n        lines.pop()\n    sections = []\n    seen = set()\n    i = 0\n\n    def section_at(n):\n        return (n + 1 < len(lines) and lines[n].startswith('--- ')\n                and lines[n + 1].startswith('+++ '))\n\n    while i < len(lines):\n        if not section_at(i):\n            if lines[i].startswith('@@'):\n                raise PatchError('hunk outside a section')\n            i += 1\n            continue\n        old_path, new_path = _path(lines[i][4:]), _path(lines[i + 1][4:])\n        path = new_path if new_path is not None else old_path\n        if path is None:\n            raise PatchError('both paths are /dev/null')\n        key = os.path.normpath(path)\n        if key in seen:\n            raise PatchError('duplicate section: ' + path)\n        seen.add(key)\n        hunks = []\n        i += 2\n        while i < len(lines) and not section_at(i):\n            if not lines[i].startswith('@@'):\n                i += 1\n                continue\n            match = _HEADER.fullmatch(lines[i])\n            if not match:\n                raise PatchError('malformed hunk header')\n            start, count, new_start, new_count = (\n                int(match[1]), int(match[2] or 1),\n                int(match[3]), int(match[4] or 1))\n            i += 1\n            body = []\n            old_n = new_n = 0\n            while i < len(lines):\n                line = lines[i]\n                if line == _MARKER:\n                    if not body or not body[-1][1].endswith(b'\\\\n'):\n                        raise PatchError('misplaced newline marker')\n                    body[-1] = (body[-1][0], body[-1][1][:-1])\n                    i += 1\n                    continue\n                if old_n == count and new_n == new_count and section_at(i):\n                    break\n                if line.startswith('@@'):\n                    break\n                if line == '':\n                    kind, value = ' ', ''\n                elif line[0] in ' +-':\n                    kind, value = line[0], line[1:]\n                else:\n                    break\n                body.append((kind, value.encode('utf-8', 'surrogateescape') + b'\\\\n'))\n                old_n += kind in ' -'\n                new_n += kind in ' +'\n                i += 1\n            if old_n \"'!= count or new_n != new_count:\n                raise PatchError('\"'hunk line counts do not match header')\n            hunks.append((start, count,\n                          [v for k, v in body if k in ' -'],\n                          [v for k, v in body if k in ' +']))\n        if not hunks:\n            raise PatchError('section has no hunks')\n        sections.append((path, old_path is None, new_path is None, hunks))\n    if not sections:\n        raise PatchError('diff has no sections')\n    return sections\n\n\ndef _file_lines(data):\n    parts = data.split(b'\\\\n')\n    return [p + b'\\\\n' for p in parts[:-1]] + ([parts[-1]] if parts[-1] else [])\n\n\ndef apply_patch(diff_text, root):\n    \\\"\\\"\\\"Apply all sections or raise PatchError without leaving partial changes.\\\"\\\"\\\"\n    snapshots = {}\n    changed = []\n    made_dirs = []\n    try:\n        sections = _sections(diff_text)\n        root = os.path.abspath(os.fspath(root))\n        real_root = os.path.realpath(root)\n        planned = []\n        result = {}\n        targets = set()\n        for path, create, delete, hunks in sections:\n            full = os.path.join(root, path)\n            real = os.path.realpath(full)\n            if os.path.commonpath([real_root, real]) \"'!= real_root or real == real_root:\n                raise PatchError('\"'path escapes root: ' + path)\n            if real in targets:\n                raise PatchError('duplicate target')\n            targets.add(real)\n            exists = os.path.lexists(full)\n            if create and exists:\n                raise PatchError('file already exists: ' + path)\n            if not create and not exists:\n                raise PatchError('missing file: ' + path)\n            if exists:\n                with open(full, 'rb') as stream:\n                    original = stream.read()\n                mode = stat.S_IMODE(os.stat(full).st_mode)\n            else:\n                original, mode = None, None\n            content = _file_lines(original or b'')\n            delta = offset = previous_end = 0\n            removed = []\n            for start, count, old, new in hunks:\n                base = (start if count == 0 else start - 1) + delta\n                expected = base + offset\n                candidates = [expected]\n                for distance in range(1, 51):\n                    candidates.extend((expected + distance, expected - distance))\n                for index in candidates:\n                    if (index >= previous_end and 0 <= index <= len(content)\n                            and index + len(old) <= len(content)\n                            and content[index:index + len(old)] == old):\n                        break\n                else:\n                    raise PatchError('hunk does not match: ' + path)\n                content[index:index + len(old)] = new\n                previous_end = index + len(new)\n                offset = index - base\n                delta += len(new) - len(old)\n                removed.extend(old)\n            if delete and (content or b''.join(removed) \"'!= original):\n                raise PatchError('\"'deletion does not remove the whole file')\n            snapshots[full] = (original, mode)\n            planned.append((full, None if delete else b''.join(content)))\n            result[path] = 'created' if create else 'deleted' if delete else 'modified'\n\n        for full, data in planned:\n            if data is not None:\n                parent = os.path.dirname(full)\n                missing = []\n                while not os.path.exists(parent):\n                    missing.append(parent)\n                    parent = os.path.dirname(parent)\n                for directory in reversed(missing):\n                    os.mkdir(directory)\n                    made_dirs.append(directory)\n            changed.append(full)\n            if data is None:\n                os.unlink(full)\n            else:\n                with open(full, 'wb') as stream:\n                    stream.write(data)\n        return result\n    except Exception as exc:\n        for full in reversed(changed):\n            original, mode = snapshots[full]\n            if original is None:\n                if os.path.lexists(full):\n                    os.unlink(full)\n            else:\n                with open(full, 'wb') as stream:\n                    stream.write(original)\n                os.chmod(full, mode)\n        for directory in reversed(made_dirs):\n            os.rmdir(directory)\n        if isinstance(exc, PatchError):\n            raise\n        raise PatchError(str(exc)) from exc\nPY\"", "aggregated_output": "", "exit_code": 0, "status": "completed"}}
{"type": "item.started", "item": {"id": "item_5", "type": "command_execution", "command": "/bin/bash -lc \"python - <<'PY'\nfrom patcher import apply_patch, PatchError\nfrom pathlib import Path\nimport tempfile\nwith tempfile.TemporaryDirectory() as d:\n p=Path(d)\n (p/'f').write_bytes(b'zero\\\\na\\\\r\\\\nb\\\\nlast')\n assert apply_patch('--- a/f\\\\n+++ b/f\\\\n@@ -1,2 +1,2 @@\\\\n a\\\\r\\\\n-b\\\\n+B\\\\n@@ -3 +3 @@\\\\n-last\\\\n\\\\\\\\ No newline at end of file\\\\n+LAST\\\\n\\\\\\\\ No newline at end of file\\\\n',d)=={'f':'modified'}\n assert (p/'f').read_bytes()==b'zero\\\\na\\\\r\\\\nB\\\\nLAST'\n before=(p/'f').read_bytes()\n try:\n  apply_patch('--- a/f\\\\n+++ b/f\\\\n@@ -1 +1 @@\\\\n-zero\\\\n+ZERO\\\\n--- a/missing\\\\n+++ b/missing\\\\n@@ -1 +1 @@\\\\n-x\\\\n+y\\\\n',d)\n except PatchError: pass\n else: raise AssertionError('expected failure')\n assert (p/'f').read_bytes()==before\n assert apply_patch('--- /dev/null\\\\n+++ b/new/deep\\\\n@@ -0,0 +1,2 @@\\\\n+hello\\\\n+world\\\\n',d)=={'new/deep':'created'}\n assert (p/'new/deep').read_bytes()==b'hello\\\\nworld\\\\n'\n assert apply_patch('--- a/new/deep\\\\n+++ /dev/null\\\\n@@ -1,2 +0,0 @@\\\\n-hello\\\\n-world\\\\n',d)=={'new/deep':'deleted'}\n assert not (p/'new/deep').exists()\n # A commit failure must roll back both files and newly made directories.\n (p/'block').write_bytes(b'x')\n try:\n  apply_patch('--- /dev/null\\\\n+++ b/added/x\\\\n@@ -0,0 +1 @@\\\\n+x\\\\n--- /dev/null\\\\n+++ b/block/x\\\\n@@ -0,0 +1 @@\\\\n+y\\\\n',d)\n except PatchError: pass\n else: raise AssertionError('expected failure')\n assert not (p/'added').exists()\n assert (p/'block').read_bytes()==b'x'\nprint('targeted checks passed')\nPY\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_5", "type": "command_execution", "command": "/bin/bash -lc \"python - <<'PY'\nfrom patcher import apply_patch, PatchError\nfrom pathlib import Path\nimport tempfile\nwith tempfile.TemporaryDirectory() as d:\n p=Path(d)\n (p/'f').write_bytes(b'zero\\\\na\\\\r\\\\nb\\\\nlast')\n assert apply_patch('--- a/f\\\\n+++ b/f\\\\n@@ -1,2 +1,2 @@\\\\n a\\\\r\\\\n-b\\\\n+B\\\\n@@ -3 +3 @@\\\\n-last\\\\n\\\\\\\\ No newline at end of file\\\\n+LAST\\\\n\\\\\\\\ No newline at end of file\\\\n',d)=={'f':'modified'}\n assert (p/'f').read_bytes()==b'zero\\\\na\\\\r\\\\nB\\\\nLAST'\n before=(p/'f').read_bytes()\n try:\n  apply_patch('--- a/f\\\\n+++ b/f\\\\n@@ -1 +1 @@\\\\n-zero\\\\n+ZERO\\\\n--- a/missing\\\\n+++ b/missing\\\\n@@ -1 +1 @@\\\\n-x\\\\n+y\\\\n',d)\n except PatchError: pass\n else: raise AssertionError('expected failure')\n assert (p/'f').read_bytes()==before\n assert apply_patch('--- /dev/null\\\\n+++ b/new/deep\\\\n@@ -0,0 +1,2 @@\\\\n+hello\\\\n+world\\\\n',d)=={'new/deep':'created'}\n assert (p/'new/deep').read_bytes()==b'hello\\\\nworld\\\\n'\n assert apply_patch('--- a/new/deep\\\\n+++ /dev/null\\\\n@@ -1,2 +0,0 @@\\\\n-hello\\\\n-world\\\\n',d)=={'new/deep':'deleted'}\n assert not (p/'new/deep').exists()\n # A commit failure must roll back both files and newly made directories.\n (p/'block').write_bytes(b'x')\n try:\n  apply_patch('--- /dev/null\\\\n+++ b/added/x\\\\n@@ -0,0 +1 @@\\\\n+x\\\\n--- /dev/null\\\\n+++ b/block/x\\\\n@@ -0,0 +1 @@\\\\n+y\\\\n',d)\n except PatchError: pass\n else: raise AssertionError('expected failure')\n assert not (p/'added').exists()\n assert (p/'block').read_bytes()==b'x'\nprint('targeted checks passed')\nPY\"", "aggregated_output": "/bin/bash: line 1: python: command not found\n", "exit_code": 127, "status": "failed"}}
{"type": "item.started", "item": {"id": "item_6", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\nfrom patcher import apply_patch, PatchError\nfrom pathlib import Path\nimport tempfile\nwith tempfile.TemporaryDirectory() as d:\n p=Path(d); (p/'f').write_bytes(b'zero\\\\na\\\\r\\\\nb\\\\nlast')\n apply_patch('--- a/f\\\\n+++ b/f\\\\n@@ -1,2 +1,2 @@\\\\n a\\\\r\\\\n-b\\\\n+B\\\\n@@ -3 +3 @@\\\\n-last\\\\n\\\\\\\\ No newline at end of file\\\\n+LAST\\\\n\\\\\\\\ No newline at end of file\\\\n',d)\n assert (p/'f').read_bytes()==b'zero\\\\na\\\\r\\\\nB\\\\nLAST'\n before=(p/'f').read_bytes()\n for diff in ['--- a/f\\\\n+++ b/f\\\\n@@ -1 +1 @@\\\\n-zero\\\\n+ZERO\\\\n--- a/missing\\\\n+++ b/missing\\\\n@@ -1 +1 @@\\\\n-x\\\\n+y\\\\n', '--- /dev/null\\\\n+++ b/added/x\\\\n@@ -0,0 +1 @@\\\\n+x\\\\n--- /dev/null\\\\n+++ b/f/x\\\\n@@ -0,0 +1 @@\\\\n+y\\\\n']:\n  try: apply_patch(diff,d)\n  except PatchError: pass\n  else: raise AssertionError('expected failure')\n  assert (p/'f').read_bytes()==before\n  assert not (p/'added').exists()\n assert apply_patch('--- /dev/null\\\\n+++ b/new/deep\\\\n@@ -0,0 +1,2 @@\\\\n+hello\\\\n+world\\\\n',d)=={'new/deep':'created'}\n assert (p/'new/deep').read_bytes()==b'hello\\\\nworld\\\\n'\n assert apply_patch('--- a/new/deep\\\\n+++ /dev/null\\\\n@@ -1,2 +0,0 @@\\\\n-hello\\\\n-world\\\\n',d)=={'new/deep':'deleted'}\n assert not (p/'new/deep').exists()\nprint('targeted checks passed')\nPY\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_6", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\nfrom patcher import apply_patch, PatchError\nfrom pathlib import Path\nimport tempfile\nwith tempfile.TemporaryDirectory() as d:\n p=Path(d); (p/'f').write_bytes(b'zero\\\\na\\\\r\\\\nb\\\\nlast')\n apply_patch('--- a/f\\\\n+++ b/f\\\\n@@ -1,2 +1,2 @@\\\\n a\\\\r\\\\n-b\\\\n+B\\\\n@@ -3 +3 @@\\\\n-last\\\\n\\\\\\\\ No newline at end of file\\\\n+LAST\\\\n\\\\\\\\ No newline at end of file\\\\n',d)\n assert (p/'f').read_bytes()==b'zero\\\\na\\\\r\\\\nB\\\\nLAST'\n before=(p/'f').read_bytes()\n for diff in ['--- a/f\\\\n+++ b/f\\\\n@@ -1 +1 @@\\\\n-zero\\\\n+ZERO\\\\n--- a/missing\\\\n+++ b/missing\\\\n@@ -1 +1 @@\\\\n-x\\\\n+y\\\\n', '--- /dev/null\\\\n+++ b/added/x\\\\n@@ -0,0 +1 @@\\\\n+x\\\\n--- /dev/null\\\\n+++ b/f/x\\\\n@@ -0,0 +1 @@\\\\n+y\\\\n']:\n  try: apply_patch(diff,d)\n  except PatchError: pass\n  else: raise AssertionError('expected failure')\n  assert (p/'f').read_bytes()==before\n  assert not (p/'added').exists()\n assert apply_patch('--- /dev/null\\\\n+++ b/new/deep\\\\n@@ -0,0 +1,2 @@\\\\n+hello\\\\n+world\\\\n',d)=={'new/deep':'created'}\n assert (p/'new/deep').read_bytes()==b'hello\\\\nworld\\\\n'\n assert apply_patch('--- a/new/deep\\\\n+++ /dev/null\\\\n@@ -1,2 +0,0 @@\\\\n-hello\\\\n-world\\\\n',d)=={'new/deep':'deleted'}\n assert not (p/'new/deep').exists()\nprint('targeted checks passed')\nPY\"", "aggregated_output": "targeted checks passed\n", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_7", "type": "agent_message", "text": "Targeted checks passed for newline preservation, shifted hunks, creation, deletion, and rollback after a write failure. I\u2019ll add regression tests for those cases, plus malformed counts, unsafe paths, and overlapping hunks."}}
{"type": "item.started", "item": {"id": "item_8", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\np='patcher.py'\ns=open(p).read().replace('snapshots[full] = (original, mode)', \\\"snapshots[full] = (original, mode, os.readlink(full) if os.path.islink(full) else None)\\\")\ns=s.replace('original, mode = snapshots[full]', 'original, mode, link = snapshots[full]')\ns=s.replace(\\\"            else:\\\\n                with open(full, 'wb') as stream:\\\\n                    stream.write(original)\\\", \\\"            elif link is not None and not os.path.lexists(full):\\\\n                os.symlink(link, full)\\\\n            else:\\\\n                with open(full, 'wb') as stream:\\\\n                    stream.write(original)\\\")\nopen(p,'w').write(s)\nPY\ncat > test_patcher.py <<'PY'\nimport tempfile\nimport unittest\nfrom pathlib import Path\n\nfrom patcher import PatchError, apply_patch\n\n\nclass PatchTests(unittest.TestCase):\n    def setUp(self):\n        self.temp = tempfile.TemporaryDirectory()\n        self.addCleanup(self.temp.cleanup)\n        self.root = Path(self.temp.name)\n\n    def tree(self):\n        return {str(p.relative_to(self.root)): p.read_bytes() if p.is_file() else None\n                for p in self.root.rglob('*')}\n\n    def fails_unchanged(self, diff):\n        before = self.tree()\n        with self.assertRaises(PatchError):\n            apply_patch(diff, self.root)\n        self.assertEqual(self.tree(), before)\n\n    def test_offsets_and_exact_newlines(self):\n        (self.root / 'f').write_bytes(b'zero\\\\na\\\\r\\\\nb\\\\nlast')\n        result = apply_patch(\n            '--- a/f\\\\told date\\\\n+++ b/f\\\\tnew date\\\\n'\n            '@@ -1,2 +1,2 @@ function\\\\n a\\\\r\\\\n-b\\\\n+B\\\\n'\n            '@@ -3 +3 @@\\\\n-last\\\\n\\\\\\\\ No newline at end of file\\\\n'\n            '+LAST\\\\n\\\\\\\\ No newline at end of file\\\\n', self.root)\n        self.assertEqual(result, {'f': 'modified'})\n        self.assertEqual((self.root / 'f').read_bytes(), b'zero\\\\na\\\\r\\\\nB\\\\nLAST')\n\n    def test_create_delete_and_empty_context(self):\n        self.assertEqual(apply_patch(\n            'ignored\\\\n--- /dev/null\\\\n+++ b/deep/f\\\\n@@ -0,0 +1,2 @@\\\\n+\\\\n+x\\\\n',\n            self.root), {'deep/f': 'created'})\n        apply_patch('--- a/deep/f\\\\n+++ b/deep/f\\\\n@@ -1,2 +1,2 @@\\\\n\\\\n-x\\\\n+y\\\\n', self.root)\n        self.assertEqual((self.root / 'deep/f').read_bytes(), b'\\\\ny\\\\n')\n        self.assertEqual(apply_patch(\n            '--- a/deep/f\\\\n+++ /dev/null\\\\n@@ -1,2 +0,0 @@\\\\n-\\\\n-y\\\\n',\n            self.root), {'deep/f': 'deleted'})\n\n    def test_failure_after_valid_section(self):\n        (self.root / 'f').write_bytes(b'a\\\\n')\n        self.fails_unchanged('--- a/f\\\\n+++ b/f\\\\n@@ -1 +1 @@\\\\n-a\\\\n+b\\\\n'\n                             '--- a/missing\\\\n+++ b/missing\\\\n@@ -1 +1 @@\\\\n-x\\\\n+y\\\\n')\n\n    def test_commit_failure_removes_new_directories(self):\n        (self.root / 'block').write_bytes(b'x')\n        self.fails_unchanged('--- /dev/null\\\\n+++ b/new/f\\\\n@@ -0,0 +1 @@\\\\n+x\\\\n'\n                             '--- /dev/null\\\\n+++ b/block/f\\\\n@@ -0,0 +1 @@\\\\n+y\\\\n')\n\n    def test_invalid_diffs(self):\n        (self.root / 'f').write_bytes(b'a\\\\nb\\\\n')\n        for diff in [\n            '',\n            '--- a/f\\\\n+++ b/f\\\\n',\n            '--- a/f\\\\n+++ b/f\\\\n@@ -1,2 +1 @@\\\\n-a\\\\n+x\\\\n',\n            '--- a/f\\\\n+++ b/../f\\\\n@@ -1 +1 @@\\\\n-a\\\\n+x\\\\n',\n            '--- a/f\\\\n+++ /dev/null\\\\n@@ -1 +0,0 @@\\\\n-a\\\\n',\n            '--- a/f\\\\n+++ b/f\\\\n@@ -1 +1 @@\\\\n-a\\\\n+x\\\\n@@ -1 +1 @@\\\\n-x\\\\n+y\\\\n',\n        ]:\n            with self.subTest(diff=diff):\n                self.fails_unchanged(diff)\n\n    def test_distance_tie_prefers_forward(self):\n        (self.root / 'f').write_bytes(b'x\\\\na\\\\nx\\\\na\\\\n')\n        apply_patch('--- a/f\\\\n+++ b/f\\\\n@@ -3 +3 @@\\\\n-a\\\\n+b\\\\n', self.root)\n        self.assertEqual((self.root / 'f').read_bytes(), b'x\\\\na\\\\nx\\\\nb\\\\n')\n\n\nif __name__ == '__main__':\n    unittest.main()\nPY\npython3 -m unittest -v\"", "aggregated_output": "", "exit_code": null, "status": "in_progress"}}
{"type": "item.completed", "item": {"id": "item_8", "type": "command_execution", "command": "/bin/bash -lc \"python3 - <<'PY'\np='patcher.py'\ns=open(p).read().replace('snapshots[full] = (original, mode)', \\\"snapshots[full] = (original, mode, os.readlink(full) if os.path.islink(full) else None)\\\")\ns=s.replace('original, mode = snapshots[full]', 'original, mode, link = snapshots[full]')\ns=s.replace(\\\"            else:\\\\n                with open(full, 'wb') as stream:\\\\n                    stream.write(original)\\\", \\\"            elif link is not None and not os.path.lexists(full):\\\\n                os.symlink(link, full)\\\\n            else:\\\\n                with open(full, 'wb') as stream:\\\\n                    stream.write(original)\\\")\nopen(p,'w').write(s)\nPY\ncat > test_patcher.py <<'PY'\nimport tempfile\nimport unittest\nfrom pathlib import Path\n\nfrom patcher import PatchError, apply_patch\n\n\nclass PatchTests(unittest.TestCase):\n    def setUp(self):\n        self.temp = tempfile.TemporaryDirectory()\n        self.addCleanup(self.temp.cleanup)\n        self.root = Path(self.temp.name)\n\n    def tree(self):\n        return {str(p.relative_to(self.root)): p.read_bytes() if p.is_file() else None\n                for p in self.root.rglob('*')}\n\n    def fails_unchanged(self, diff):\n        before = self.tree()\n        with self.assertRaises(PatchError):\n            apply_patch(diff, self.root)\n        self.assertEqual(self.tree(), before)\n\n    def test_offsets_and_exact_newlines(self):\n        (self.root / 'f').write_bytes(b'zero\\\\na\\\\r\\\\nb\\\\nlast')\n        result = apply_patch(\n            '--- a/f\\\\told date\\\\n+++ b/f\\\\tnew date\\\\n'\n            '@@ -1,2 +1,2 @@ function\\\\n a\\\\r\\\\n-b\\\\n+B\\\\n'\n            '@@ -3 +3 @@\\\\n-last\\\\n\\\\\\\\ No newline at end of file\\\\n'\n            '+LAST\\\\n\\\\\\\\ No newline at end of file\\\\n', self.root)\n        self.assertEqual(result, {'f': 'modified'})\n        self.assertEqual((self.root / 'f').read_bytes(), b'zero\\\\na\\\\r\\\\nB\\\\nLAST')\n\n    def test_create_delete_and_empty_context(self):\n        self.assertEqual(apply_patch(\n            'ignored\\\\n--- /dev/null\\\\n+++ b/deep/f\\\\n@@ -0,0 +1,2 @@\\\\n+\\\\n+x\\\\n',\n            self.root), {'deep/f': 'created'})\n        apply_patch('--- a/deep/f\\\\n+++ b/deep/f\\\\n@@ -1,2 +1,2 @@\\\\n\\\\n-x\\\\n+y\\\\n', self.root)\n        self.assertEqual((self.root / 'deep/f').read_bytes(), b'\\\\ny\\\\n')\n        self.assertEqual(apply_patch(\n            '--- a/deep/f\\\\n+++ /dev/null\\\\n@@ -1,2 +0,0 @@\\\\n-\\\\n-y\\\\n',\n            self.root), {'deep/f': 'deleted'})\n\n    def test_failure_after_valid_section(self):\n        (self.root / 'f').write_bytes(b'a\\\\n')\n        self.fails_unchanged('--- a/f\\\\n+++ b/f\\\\n@@ -1 +1 @@\\\\n-a\\\\n+b\\\\n'\n                             '--- a/missing\\\\n+++ b/missing\\\\n@@ -1 +1 @@\\\\n-x\\\\n+y\\\\n')\n\n    def test_commit_failure_removes_new_directories(self):\n        (self.root / 'block').write_bytes(b'x')\n        self.fails_unchanged('--- /dev/null\\\\n+++ b/new/f\\\\n@@ -0,0 +1 @@\\\\n+x\\\\n'\n                             '--- /dev/null\\\\n+++ b/block/f\\\\n@@ -0,0 +1 @@\\\\n+y\\\\n')\n\n    def test_invalid_diffs(self):\n        (self.root / 'f').write_bytes(b'a\\\\nb\\\\n')\n        for diff in [\n            '',\n            '--- a/f\\\\n+++ b/f\\\\n',\n            '--- a/f\\\\n+++ b/f\\\\n@@ -1,2 +1 @@\\\\n-a\\\\n+x\\\\n',\n            '--- a/f\\\\n+++ b/../f\\\\n@@ -1 +1 @@\\\\n-a\\\\n+x\\\\n',\n            '--- a/f\\\\n+++ /dev/null\\\\n@@ -1 +0,0 @@\\\\n-a\\\\n',\n            '--- a/f\\\\n+++ b/f\\\\n@@ -1 +1 @@\\\\n-a\\\\n+x\\\\n@@ -1 +1 @@\\\\n-x\\\\n+y\\\\n',\n        ]:\n            with self.subTest(diff=diff):\n                self.fails_unchanged(diff)\n\n    def test_distance_tie_prefers_forward(self):\n        (self.root / 'f').write_bytes(b'x\\\\na\\\\nx\\\\na\\\\n')\n        apply_patch('--- a/f\\\\n+++ b/f\\\\n@@ -3 +3 @@\\\\n-a\\\\n+b\\\\n', self.root)\n        self.assertEqual((self.root / 'f').read_bytes(), b'x\\\\na\\\\nx\\\\nb\\\\n')\n\n\nif __name__ == '__main__':\n    unittest.main()\nPY\npython3 -m unittest -v\"", "aggregated_output": "test_commit_failure_removes_new_directories (test_patcher.PatchTests.test_commit_failure_removes_new_directories) ... ok\ntest_create_delete_and_empty_context (test_patcher.PatchTests.test_create_delete_and_empty_context) ... ok\ntest_distance_tie_prefers_forward (test_patcher.PatchTests.test_distance_tie_prefers_forward) ... ok\ntest_failure_after_valid_section (test_patcher.PatchTests.test_failure_after_valid_section) ... ok\ntest_invalid_diffs (test_patcher.PatchTests.test_invalid_diffs) ... ok\ntest_offsets_and_exact_newlines (test_patcher.PatchTests.test_offsets_and_exact_newlines) ... ok\n\n----------------------------------------------------------------------\nRan 6 tests in 0.004s\n\nOK\n", "exit_code": 0, "status": "completed"}}
{"type": "item.completed", "item": {"id": "item_9", "type": "agent_message", "text": "Rewrote `patcher.py` to preserve exact bytes, validate hunks and paths, follow the required offset search, and roll back failed changes.\n\nAdded six regression tests covering creation, deletion, newline handling, matching, malformed diffs, and atomicity.\n\nValidation: `python3 -m unittest -v` \u2014 all six tests pass."}}
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