unpack_objects.py
python
sha256:c5131d76c6eada02939111fda4aa8e51b0c1456b9983727cfd6be101916de14e
merge: pull local/dev — resolve trivial _EXT_MAP symbol con…
Sonnet 4.6
patch
12 days ago
| 1 | """muse unpack-objects — read a MPack from stdin and write to store. |
| 2 | |
| 3 | Reads a MPack msgpack binary from stdin and idempotently writes its |
| 4 | commits, snapshots, blobs, and tags into the local ``.muse/`` store. |
| 5 | |
| 6 | Usage:: |
| 7 | |
| 8 | cat pack.muse | muse unpack-objects |
| 9 | muse pack-objects HEAD | muse unpack-objects |
| 10 | |
| 11 | Output:: |
| 12 | |
| 13 | { |
| 14 | "commits_written": 12, |
| 15 | "snapshots_written": 12, |
| 16 | "blobs_written": 47, |
| 17 | "blobs_skipped": 3, |
| 18 | "tags_written": 2, |
| 19 | "duration_ms": 8.3, |
| 20 | "exit_code": 0 |
| 21 | } |
| 22 | |
| 23 | Output contract |
| 24 | --------------- |
| 25 | |
| 26 | - Exit 0: blobs unpacked (idempotent — already-present blobs are skipped). |
| 27 | - Exit 1: invalid input (bad format flag, malformed msgpack, not a top-level map). |
| 28 | - Exit 3: write failure (``apply_mpack`` raised ``OSError``). |
| 29 | |
| 30 | JSON error contract |
| 31 | ------------------- |
| 32 | |
| 33 | When ``--json`` (or ``--format json``) is active, **all** errors are emitted |
| 34 | to **stdout** (not stderr) so agents can always parse a structured response:: |
| 35 | |
| 36 | {"error": "<key>", "message": "<description>", "duration_ms": 0.3, "exit_code": 1} |
| 37 | |
| 38 | Exit codes:: |
| 39 | |
| 40 | 0 — success |
| 41 | 1 — user error (bad format, invalid msgpack, not a map) |
| 42 | 3 — write failure (OSError from apply_mpack) |
| 43 | """ |
| 44 | |
| 45 | import argparse |
| 46 | import json |
| 47 | import logging |
| 48 | import sys |
| 49 | from typing import TypeGuard |
| 50 | |
| 51 | from muse.core.envelope import EnvelopeJson, make_envelope |
| 52 | from muse.core.errors import ExitCode |
| 53 | from muse.core.mpack import MPack, apply_mpack |
| 54 | from muse.core.repo import require_repo |
| 55 | from muse.core.io import MAX_PACK_MSGPACK_BYTES, safe_unpackb |
| 56 | from muse.core.types import MsgpackValue |
| 57 | from muse.core.commits import CommitDict |
| 58 | from muse.core.snapshots import SnapshotDict |
| 59 | from muse.core.types import BranchHeads |
| 60 | from muse.core.timing import start_timer |
| 61 | |
| 62 | class _UnpackObjectsJson(EnvelopeJson): |
| 63 | commits_written: int |
| 64 | snapshots_written: int |
| 65 | blobs_written: int |
| 66 | blobs_skipped: int |
| 67 | tags_written: int |
| 68 | |
| 69 | logger = logging.getLogger(__name__) |
| 70 | |
| 71 | def _is_commit_dict(v: MsgpackValue) -> TypeGuard[CommitDict]: |
| 72 | """TypeGuard for narrowing MsgpackValue → CommitDict at the wire boundary.""" |
| 73 | return isinstance(v, dict) |
| 74 | |
| 75 | def _is_snapshot_dict(v: MsgpackValue) -> TypeGuard[SnapshotDict]: |
| 76 | """TypeGuard for narrowing MsgpackValue → SnapshotDict at the wire boundary.""" |
| 77 | return isinstance(v, dict) |
| 78 | |
| 79 | def _as_branch_heads(v: MsgpackValue) -> BranchHeads: |
| 80 | """Extract branch_heads from a wire payload, narrowing safely.""" |
| 81 | if not isinstance(v, dict): |
| 82 | return {} |
| 83 | return {str(k): str(val) for k, val in v.items() if isinstance(val, str)} |
| 84 | |
| 85 | def register(subparsers: "argparse._SubParsersAction[argparse.ArgumentParser]") -> None: |
| 86 | """Register the unpack-objects subcommand.""" |
| 87 | parser = subparsers.add_parser( |
| 88 | "unpack-objects", |
| 89 | help="Read a MPack JSON from stdin, write to the local store.", |
| 90 | description=__doc__, |
| 91 | ) |
| 92 | parser.add_argument( |
| 93 | "--json", "-j", |
| 94 | action="store_true", |
| 95 | dest="json_out", |
| 96 | help="Emit machine-readable JSON on stdout.", |
| 97 | ) |
| 98 | parser.set_defaults(func=run, json_out=False) |
| 99 | |
| 100 | def run(args: argparse.Namespace) -> None: |
| 101 | """Read a MPack from stdin and write to the local store. |
| 102 | |
| 103 | Idempotently writes commits, snapshots, blobs, and tags from a msgpack |
| 104 | binary on stdin. Already-present blobs are silently skipped. Partial |
| 105 | packs are safe to re-apply — the store is always consistent after the call. |
| 106 | |
| 107 | Agent quickstart:: |
| 108 | |
| 109 | cat pack.muse | muse unpack-objects --json |
| 110 | muse pack-objects HEAD | muse unpack-objects --json |
| 111 | |
| 112 | JSON fields:: |
| 113 | |
| 114 | commits_written Number of commit records written to the store. |
| 115 | snapshots_written Number of snapshot records written to the store. |
| 116 | blobs_written Number of content blobs written. |
| 117 | blobs_skipped Number of blobs already present (skipped). |
| 118 | tags_written Number of tag records written. |
| 119 | muse_version Muse release that produced this output. |
| 120 | schema Envelope schema version (int). |
| 121 | exit_code 0 on success, 1 on user error, 3 on write failure. |
| 122 | duration_ms Wall-clock milliseconds for the command. |
| 123 | timestamp ISO-8601 UTC timestamp of command completion. |
| 124 | warnings List of non-fatal advisory messages. |
| 125 | |
| 126 | Exit codes:: |
| 127 | |
| 128 | 0 Objects unpacked successfully. |
| 129 | 1 User error (bad format, malformed msgpack, not a top-level map). |
| 130 | 3 Write failure (OSError from apply_mpack). |
| 131 | """ |
| 132 | elapsed = start_timer() |
| 133 | json_out: bool = args.json_out |
| 134 | |
| 135 | def _emit_error(msg: str, code: int, error_key: str = "error") -> None: |
| 136 | if json_out: |
| 137 | print(json.dumps({**make_envelope(elapsed, exit_code=code), "error": error_key, "message": msg})) |
| 138 | else: |
| 139 | print(f"❌ {msg}", file=sys.stderr) |
| 140 | raise SystemExit(code) |
| 141 | |
| 142 | root = require_repo() |
| 143 | |
| 144 | raw_bytes = sys.stdin.buffer.read() |
| 145 | try: |
| 146 | raw_dict = safe_unpackb( |
| 147 | raw_bytes, |
| 148 | context="stdin", |
| 149 | max_bytes=MAX_PACK_MSGPACK_BYTES, |
| 150 | allow_binary=True, |
| 151 | ) |
| 152 | except Exception as exc: |
| 153 | _emit_error(f"Invalid msgpack from stdin: {exc}", ExitCode.USER_ERROR, "invalid_msgpack") |
| 154 | |
| 155 | if not isinstance(raw_dict, dict): |
| 156 | _emit_error("Expected a msgpack map at the top level.", ExitCode.USER_ERROR, "invalid_format") |
| 157 | |
| 158 | from muse.core.mpack import BlobPayload |
| 159 | |
| 160 | raw_blobs: list[BlobPayload] = [] |
| 161 | raw_blobs_v = raw_dict.get("blobs") |
| 162 | for item in (raw_blobs_v if isinstance(raw_blobs_v, list) else []): |
| 163 | if isinstance(item, dict): |
| 164 | oid = item.get("object_id") |
| 165 | content = item.get("content") |
| 166 | if isinstance(oid, str) and isinstance(content, (bytes, bytearray)): |
| 167 | raw_blobs.append(BlobPayload(object_id=oid, content=bytes(content))) |
| 168 | |
| 169 | raw_commits = raw_dict.get("commits") |
| 170 | raw_snapshots = raw_dict.get("snapshots") |
| 171 | mpack = MPack( |
| 172 | commits=[r for r in raw_commits if _is_commit_dict(r)] if isinstance(raw_commits, list) else [], |
| 173 | snapshots=[r for r in raw_snapshots if _is_snapshot_dict(r)] if isinstance(raw_snapshots, list) else [], |
| 174 | blobs=raw_blobs, |
| 175 | branch_heads=_as_branch_heads(raw_dict.get("branch_heads")), |
| 176 | ) |
| 177 | |
| 178 | try: |
| 179 | result = apply_mpack(root, mpack) |
| 180 | except OSError as exc: |
| 181 | _emit_error(str(exc), ExitCode.INTERNAL_ERROR, "write_error") |
| 182 | |
| 183 | if not json_out: |
| 184 | print( |
| 185 | f"Wrote {result['commits_written']} commits, " |
| 186 | f"{result['snapshots_written']} snapshots, " |
| 187 | f"{result['blobs_written']} blobs, " |
| 188 | f"{result['tags_written']} tags " |
| 189 | f"({result['blobs_skipped']} skipped)." |
| 190 | ) |
| 191 | return |
| 192 | |
| 193 | print(json.dumps(_UnpackObjectsJson( |
| 194 | **make_envelope(elapsed), |
| 195 | commits_written=result["commits_written"], |
| 196 | snapshots_written=result["snapshots_written"], |
| 197 | blobs_written=result["blobs_written"], |
| 198 | blobs_skipped=result["blobs_skipped"], |
| 199 | tags_written=result["tags_written"], |
| 200 | ))) |
File History
6 commits
sha256:c5131d76c6eada02939111fda4aa8e51b0c1456b9983727cfd6be101916de14e
merge: pull local/dev — resolve trivial _EXT_MAP symbol con…
Sonnet 4.6
patch
12 days ago
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