cherry_pick.py
python
| 1 | """muse cherry-pick — apply a specific commit's changes on top of HEAD.""" |
| 2 | |
| 3 | from __future__ import annotations |
| 4 | |
| 5 | import datetime |
| 6 | import json |
| 7 | import logging |
| 8 | import pathlib |
| 9 | import shutil |
| 10 | |
| 11 | import typer |
| 12 | |
| 13 | from muse.core.errors import ExitCode |
| 14 | from muse.core.merge_engine import write_merge_state |
| 15 | from muse.core.object_store import restore_object |
| 16 | from muse.core.repo import require_repo |
| 17 | from muse.core.snapshot import compute_commit_id, compute_snapshot_id |
| 18 | from muse.core.store import ( |
| 19 | CommitRecord, |
| 20 | SnapshotRecord, |
| 21 | get_head_commit_id, |
| 22 | get_head_snapshot_manifest, |
| 23 | read_commit, |
| 24 | read_snapshot, |
| 25 | resolve_commit_ref, |
| 26 | write_commit, |
| 27 | write_snapshot, |
| 28 | ) |
| 29 | from muse.domain import SnapshotManifest |
| 30 | from muse.plugins.registry import read_domain, resolve_plugin |
| 31 | |
| 32 | logger = logging.getLogger(__name__) |
| 33 | |
| 34 | app = typer.Typer() |
| 35 | |
| 36 | |
| 37 | def _read_branch(root: pathlib.Path) -> str: |
| 38 | head_ref = (root / ".muse" / "HEAD").read_text().strip() |
| 39 | return head_ref.removeprefix("refs/heads/").strip() |
| 40 | |
| 41 | |
| 42 | def _read_repo_id(root: pathlib.Path) -> str: |
| 43 | return str(json.loads((root / ".muse" / "repo.json").read_text())["repo_id"]) |
| 44 | |
| 45 | |
| 46 | @app.callback(invoke_without_command=True) |
| 47 | def cherry_pick( |
| 48 | ctx: typer.Context, |
| 49 | ref: str = typer.Argument(..., help="Commit ID to apply."), |
| 50 | no_commit: bool = typer.Option(False, "-n", "--no-commit", help="Apply but do not commit."), |
| 51 | ) -> None: |
| 52 | """Apply a specific commit's changes on top of HEAD.""" |
| 53 | root = require_repo() |
| 54 | repo_id = _read_repo_id(root) |
| 55 | branch = _read_branch(root) |
| 56 | domain = read_domain(root) |
| 57 | plugin = resolve_plugin(root) |
| 58 | |
| 59 | target = resolve_commit_ref(root, repo_id, branch, ref) |
| 60 | if target is None: |
| 61 | typer.echo(f"❌ Commit '{ref}' not found.") |
| 62 | raise typer.Exit(code=ExitCode.USER_ERROR) |
| 63 | |
| 64 | # The delta for this cherry-pick is: target vs its parent. |
| 65 | # Applying that delta on top of HEAD is a three-way merge where the |
| 66 | # base is the target's parent, left is HEAD, and right is the target. |
| 67 | base_manifest: dict[str, str] = {} |
| 68 | if target.parent_commit_id: |
| 69 | parent_commit = read_commit(root, target.parent_commit_id) |
| 70 | if parent_commit: |
| 71 | parent_snap = read_snapshot(root, parent_commit.snapshot_id) |
| 72 | if parent_snap: |
| 73 | base_manifest = parent_snap.manifest |
| 74 | |
| 75 | target_snap_rec = read_snapshot(root, target.snapshot_id) |
| 76 | target_manifest = target_snap_rec.manifest if target_snap_rec else {} |
| 77 | ours_manifest = get_head_snapshot_manifest(root, repo_id, branch) or {} |
| 78 | |
| 79 | base_snap = SnapshotManifest(files=base_manifest, domain=domain) |
| 80 | ours_snap = SnapshotManifest(files=ours_manifest, domain=domain) |
| 81 | target_snap = SnapshotManifest(files=target_manifest, domain=domain) |
| 82 | |
| 83 | result = plugin.merge(base_snap, ours_snap, target_snap) |
| 84 | |
| 85 | if not result.is_clean: |
| 86 | write_merge_state( |
| 87 | root, |
| 88 | base_commit=target.parent_commit_id or "", |
| 89 | ours_commit=get_head_commit_id(root, branch) or "", |
| 90 | theirs_commit=target.commit_id, |
| 91 | conflict_paths=result.conflicts, |
| 92 | ) |
| 93 | typer.echo(f"❌ Cherry-pick conflict in {len(result.conflicts)} file(s):") |
| 94 | for p in sorted(result.conflicts): |
| 95 | typer.echo(f" CONFLICT (both modified): {p}") |
| 96 | raise typer.Exit(code=ExitCode.USER_ERROR) |
| 97 | |
| 98 | merged_manifest = result.merged["files"] |
| 99 | workdir = root / "muse-work" |
| 100 | if workdir.exists(): |
| 101 | shutil.rmtree(workdir) |
| 102 | workdir.mkdir() |
| 103 | for rel_path, object_id in merged_manifest.items(): |
| 104 | restore_object(root, object_id, workdir / rel_path) |
| 105 | |
| 106 | if no_commit: |
| 107 | typer.echo(f"Applied {target.commit_id[:8]} to muse-work/. Run 'muse commit' to record.") |
| 108 | return |
| 109 | |
| 110 | head_commit_id = get_head_commit_id(root, branch) |
| 111 | # merged_manifest contains only object IDs already in the store |
| 112 | # (sourced from base, ours, or theirs — all previously committed). |
| 113 | # No re-scan or object re-write is needed. |
| 114 | manifest = merged_manifest |
| 115 | snapshot_id = compute_snapshot_id(manifest) |
| 116 | committed_at = datetime.datetime.now(datetime.timezone.utc) |
| 117 | commit_id = compute_commit_id( |
| 118 | parent_ids=[head_commit_id] if head_commit_id else [], |
| 119 | snapshot_id=snapshot_id, |
| 120 | message=target.message, |
| 121 | committed_at_iso=committed_at.isoformat(), |
| 122 | ) |
| 123 | |
| 124 | write_snapshot(root, SnapshotRecord(snapshot_id=snapshot_id, manifest=manifest)) |
| 125 | write_commit(root, CommitRecord( |
| 126 | commit_id=commit_id, |
| 127 | repo_id=repo_id, |
| 128 | branch=branch, |
| 129 | snapshot_id=snapshot_id, |
| 130 | message=target.message, |
| 131 | committed_at=committed_at, |
| 132 | parent_commit_id=head_commit_id, |
| 133 | )) |
| 134 | (root / ".muse" / "refs" / "heads" / branch).write_text(commit_id) |
| 135 | typer.echo(f"[{branch} {commit_id[:8]}] {target.message}") |