feat(pull,push): parallel execution via --jobs flag

Adds `pkgmgr pull -j N` and `pkgmgr push -j N` for concurrent operation
across repositories (default: min(cpu_count, 8), use 1 for sequential).
Verification in pull also parallelizes; interactive prompts and the
actual git command still run on the main thread. Shared parallel-runner
and repo-resolution helpers live in a new `_parallel.py` module.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/pkgmgr/actions/repository/_parallel.py

@@ -0,0 +1,91 @@
+from __future__ import annotations
+
+import os
+import sys
+from concurrent.futures import ThreadPoolExecutor, as_completed
+from typing import Any, Callable, Dict, List, Tuple
+
+from pkgmgr.core.repository.dir import get_repo_dir
+from pkgmgr.core.repository.identifier import get_repo_identifier
+
+Repository = Dict[str, Any]
+RepoRef = Tuple[str, str]
+OpResult = Tuple[bool, str]
+RepoOp = Callable[[str], OpResult]
+
+
+def resolve_repos(
+    selected_repos: List[Repository],
+    repositories_base_dir: str,
+    all_repos: List[Repository],
+) -> List[RepoRef]:
+    """
+    Resolve ``(identifier, repo_dir)`` pairs for ``selected_repos``.
+
+    Repositories whose directory does not exist on disk are reported and
+    skipped, matching the prior behavior of pull/push handlers.
+    """
+    resolved: List[RepoRef] = []
+    for repo in selected_repos:
+        ident = get_repo_identifier(repo, all_repos)
+        rd = get_repo_dir(repositories_base_dir, repo)
+        if not os.path.exists(rd):
+            print(f"Repository directory '{rd}' not found for {ident}.")
+            continue
+        resolved.append((ident, rd))
+    return resolved
+
+
+def run_on_repos(
+    repos: List[RepoRef],
+    op: RepoOp,
+    *,
+    jobs: int,
+    op_name: str,
+) -> None:
+    """
+    Run ``op(repo_dir) -> (ok, msg)`` for each repo, optionally in parallel.
+
+    - ``jobs == 1``: serial, quiet on success, prints ``msg`` on failure.
+    - ``jobs  > 1``: parallel via ThreadPoolExecutor, prints a banner plus
+      ``[OK]``/``[FAIL]`` per repo and a final summary.
+    - Exits with status 1 if any operation failed.
+    """
+    if not repos:
+        return
+
+    effective_jobs = max(1, min(jobs, len(repos)))
+    failed: List[Tuple[str, str]] = []
+
+    if effective_jobs == 1:
+        for ident, rd in repos:
+            ok, msg = op(rd)
+            if not ok:
+                print(msg)
+                failed.append((ident, msg))
+    else:
+        print(
+            f"[{op_name.upper()}] Running {len(repos)} {op_name}(s) with up to "
+            f"{effective_jobs} parallel jobs..."
+        )
+        with ThreadPoolExecutor(max_workers=effective_jobs) as executor:
+            futures = {executor.submit(op, rd): ident for ident, rd in repos}
+            for future in as_completed(futures):
+                ident = futures[future]
+                ok, msg = future.result()
+                if ok:
+                    print(f"[OK]   {ident}")
+                else:
+                    print(f"[FAIL] {ident}")
+                    for line in msg.splitlines():
+                        print(f"       {line}")
+                    failed.append((ident, msg))
+
+    if failed:
+        if effective_jobs > 1:
+            print(
+                f"\n[SUMMARY] {len(failed)} of {len(repos)} {op_name}(s) failed:"
+            )
+            for ident, _msg in failed:
+                print(f"  - {ident}")
+        sys.exit(1)

src/pkgmgr/actions/repository/pull.py

@@ -1,17 +1,66 @@
 from __future__ import annotations
 
 import os
-import sys
-from typing import List, Dict, Any
+from concurrent.futures import ThreadPoolExecutor
+from typing import Any, Dict, List, Tuple
 
+from pkgmgr.actions.repository._parallel import RepoRef, run_on_repos
 from pkgmgr.core.git.commands import pull_args, GitPullArgsError
-from pkgmgr.core.repository.dir import get_repo_dir
 from pkgmgr.core.repository.identifier import get_repo_identifier
+from pkgmgr.core.repository.dir import get_repo_dir
 from pkgmgr.core.repository.verify import verify_repository
 
 Repository = Dict[str, Any]
 
 
+def _pull_one(repo_dir: str, extra_args: List[str], preview: bool) -> Tuple[bool, str]:
+    try:
+        pull_args(extra_args, cwd=repo_dir, preview=preview)
+        return (True, "")
+    except GitPullArgsError as exc:
+        return (False, str(exc))
+
+
+def _verify_one(
+    repo: Repository,
+    repo_dir: str,
+    no_verification: bool,
+) -> Tuple[bool, bool, List[str]]:
+    """Returns (has_verified_info, verified_ok, errors)."""
+    verified_ok, errors, _commit, _key = verify_repository(
+        repo, repo_dir, mode="pull", no_verification=no_verification,
+    )
+    return (bool(repo.get("verified")), verified_ok, errors)
+
+
+def _verify_all(
+    candidates: List[Tuple[Repository, str, str]],
+    no_verification: bool,
+    jobs: int,
+) -> List[Tuple[str, str, bool, bool, List[str]]]:
+    """
+    Verify all candidates (parallel if ``jobs > 1``), preserving input order.
+
+    Returns one tuple per candidate: ``(ident, repo_dir, has_verified_info,
+    verified_ok, errors)``.
+    """
+    verify_jobs = max(1, min(jobs, len(candidates)))
+    if verify_jobs == 1:
+        return [
+            (ident, rd, *_verify_one(repo, rd, no_verification))
+            for repo, ident, rd in candidates
+        ]
+    with ThreadPoolExecutor(max_workers=verify_jobs) as executor:
+        futures = [
+            executor.submit(_verify_one, repo, rd, no_verification)
+            for repo, _ident, rd in candidates
+        ]
+        results = [f.result() for f in futures]
+    return [
+        (ident, rd, *res) for (_repo, ident, rd), res in zip(candidates, results)
+    ]
+
+
 def pull_with_verification(
     selected_repos: List[Repository],
     repositories_base_dir: str,
@@ -19,41 +68,45 @@ def pull_with_verification(
     extra_args: List[str],
     no_verification: bool,
     preview: bool,
+    jobs: int = 1,
 ) -> None:
     """
     Execute `git pull` for each repository with verification.
 
-    - If verification fails and verification is enabled, prompt user to continue.
-    - Uses core.git.commands.pull_args() (no raw subprocess usage).
+    - Verification (I/O-bound) runs in parallel when ``jobs > 1``.
+    - Interactive prompts for failed verifications are handled serially on the
+      main thread after parallel verification completes.
+    - Approved repos are then pulled in parallel when ``jobs > 1``.
+    - On any pull failure, prints a summary and exits with status 1.
     """
+    candidates: List[Tuple[Repository, str, str]] = []
     for repo in selected_repos:
-        repo_identifier = get_repo_identifier(repo, all_repos)
-        repo_dir = get_repo_dir(repositories_base_dir, repo)
-
-        if not os.path.exists(repo_dir):
-            print(f"Repository directory '{repo_dir}' not found for {repo_identifier}.")
+        ident = get_repo_identifier(repo, all_repos)
+        rd = get_repo_dir(repositories_base_dir, repo)
+        if not os.path.exists(rd):
+            print(f"Repository directory '{rd}' not found for {ident}.")
             continue
+        candidates.append((repo, ident, rd))
 
-        verified_info = repo.get("verified")
-        verified_ok, errors, _commit_hash, _signing_key = verify_repository(
-            repo,
-            repo_dir,
-            mode="pull",
-            no_verification=no_verification,
-        )
+    if not candidates:
+        return
 
-        if not preview and not no_verification and verified_info and not verified_ok:
-            print(f"Warning: Verification failed for {repo_identifier}:")
+    verify_results = _verify_all(candidates, no_verification, jobs)
+
+    approved: List[RepoRef] = []
+    for ident, rd, has_verified_info, verified_ok, errors in verify_results:
+        if not preview and not no_verification and has_verified_info and not verified_ok:
+            print(f"Warning: Verification failed for {ident}:")
             for err in errors:
                 print(f"  - {err}")
             choice = input("Proceed with 'git pull'? (y/N): ").strip().lower()
             if choice != "y":
                 continue
+        approved.append((ident, rd))
 
-        try:
-            pull_args(extra_args, cwd=repo_dir, preview=preview)
-        except GitPullArgsError as exc:
-            # Keep behavior consistent with previous implementation:
-            # stop on first failure and propagate return code as generic failure.
-            print(str(exc))
-            sys.exit(1)
+    run_on_repos(
+        approved,
+        lambda rd: _pull_one(rd, extra_args, preview),
+        jobs=jobs,
+        op_name="pull",
+    )

src/pkgmgr/actions/repository/push.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from typing import Any, Dict, List, Tuple
+
+from pkgmgr.actions.repository._parallel import (
+    resolve_repos,
+    run_on_repos,
+)
+from pkgmgr.core.git.commands import push_args, GitPushArgsError
+
+Repository = Dict[str, Any]
+
+
+def _push_one(repo_dir: str, extra_args: List[str], preview: bool) -> Tuple[bool, str]:
+    try:
+        push_args(extra_args, cwd=repo_dir, preview=preview)
+        return (True, "")
+    except GitPushArgsError as exc:
+        return (False, str(exc))
+
+
+def push_in_parallel(
+    selected_repos: List[Repository],
+    repositories_base_dir: str,
+    all_repos: List[Repository],
+    extra_args: List[str],
+    preview: bool,
+    jobs: int = 1,
+) -> None:
+    """
+    Execute `git push` for each repository, optionally in parallel.
+    """
+    repos = resolve_repos(selected_repos, repositories_base_dir, all_repos)
+    run_on_repos(
+        repos,
+        lambda rd: _push_one(rd, extra_args, preview),
+        jobs=jobs,
+        op_name="push",
+    )

src/pkgmgr/cli/proxy.py

@@ -12,6 +12,7 @@ from pkgmgr.cli.context import CLIContext
 from pkgmgr.actions.repository.clone import clone_repos
 from pkgmgr.actions.proxy import exec_proxy_command
 from pkgmgr.actions.repository.pull import pull_with_verification
+from pkgmgr.actions.repository.push import push_in_parallel
 from pkgmgr.core.repository.selected import get_selected_repos
 from pkgmgr.core.repository.dir import get_repo_dir
 
@@ -177,6 +178,17 @@ def register_proxy_commands(
                     default=False,
                     help="Disable verification via commit/gpg",
                 )
+            if subcommand in ("pull", "push"):
+                parser.add_argument(
+                    "-j",
+                    "--jobs",
+                    type=int,
+                    default=min(os.cpu_count() or 4, 8),
+                    help=(
+                        f"Number of parallel {subcommand}s "
+                        "(default: min(cpu_count, 8)). Use 1 for sequential."
+                    ),
+                )
             if subcommand == "clone":
                 parser.add_argument(
                     "--clone-mode",
@@ -234,6 +246,16 @@ def maybe_handle_proxy(args: argparse.Namespace, ctx: CLIContext) -> bool:
                 args.extra_args,
                 args.no_verification,
                 args.preview,
+                jobs=args.jobs,
+            )
+        elif args.command == "push":
+            push_in_parallel(
+                selected,
+                ctx.repositories_base_dir,
+                ctx.all_repositories,
+                args.extra_args,
+                args.preview,
+                jobs=args.jobs,
             )
         else:
             exec_proxy_command(

src/pkgmgr/core/git/commands/__init__.py

@@ -19,6 +19,7 @@ from .pull import GitPullError, pull
 from .pull_args import GitPullArgsError, pull_args
 from .pull_ff_only import GitPullFfOnlyError, pull_ff_only
 from .push import GitPushError, push
+from .push_args import GitPushArgsError, push_args
 from .push_upstream import GitPushUpstreamError, push_upstream
 from .set_remote_url import GitSetRemoteUrlError, set_remote_url
 from .tag_annotated import GitTagAnnotatedError, tag_annotated
@@ -34,6 +35,7 @@ __all__ = [
     "pull_ff_only",
     "merge_no_ff",
     "push",
+    "push_args",
     "commit",
     "delete_local_branch",
     "delete_remote_branch",
@@ -56,6 +58,7 @@ __all__ = [
     "GitPullFfOnlyError",
     "GitMergeError",
     "GitPushError",
+    "GitPushArgsError",
     "GitCommitError",
     "GitDeleteLocalBranchError",
     "GitDeleteRemoteBranchError",

src/pkgmgr/core/git/commands/push_args.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from typing import List
+
+from ..errors import GitRunError, GitCommandError
+from ..run import run
+
+
+class GitPushArgsError(GitCommandError):
+    """Raised when `git push` with arbitrary args fails."""
+
+
+def push_args(
+    args: List[str] | None = None,
+    *,
+    cwd: str = ".",
+    preview: bool = False,
+) -> None:
+    """
+    Execute `git push` with caller-provided arguments.
+
+    Examples:
+      []                          -> git push
+      ["--force"]                 -> git push --force
+      ["origin", "main"]          -> git push origin main
+      ["-u", "origin", "feature"] -> git push -u origin feature
+    """
+    extra = args or []
+    try:
+        run(["push", *extra], cwd=cwd, preview=preview)
+    except GitRunError as exc:
+        details = getattr(exc, "output", None) or getattr(exc, "stderr", None) or ""
+        raise GitPushArgsError(
+            (
+                f"Failed to run `git push` with args={extra!r} "
+                f"in cwd={cwd!r}.\n{details}"
+            ).rstrip(),
+            cwd=cwd,
+        ) from exc