hgresume

ASP.NET Core server for resumable Mercurial bundle transfer. It speaks the same endpoints, X-HgR-* header protocol, and status-code mapping as the historical PHP API, so existing Chorus clients work unchanged.

Authentication is intentionally not implemented here; it is handled by the surrounding platform (reverse proxy / gateway).

The original PHP implementation is no longer in this tree. The last commit that still contains it is 3f2b3c7 (api/).

Layout

• csharp/src/HgResume.Api/ — the ASP.NET Core app (net10.0).
  • RestDispatcher — routes on the last path segment (/api/v03/<method>), binds query/body params (including baseHashes[]), and writes the X-HgR-* response contract.
  • HgResumeApi — push/pull/getRevisions/finish*/isAvailable.
  • HgRunner — shells out to hg (incoming/unbundle/bundle -t v1/log/branches/tip).
  • AsyncRunner — runs long hg commands in the background and signals completion via a .async_run file, so a later HTTP request can observe the result (this is what makes transfers resumable).
  • BundleHelper — per-transaction state + metadata (stored as JSON).
• csharp/test/HgResume.HttpTests/ — HTTP-level xUnit tests. They drive the running container over HTTP (via a podman-managed fixture) and assert on the protocol.
• csharp/Dockerfile — multi-stage dotnet/sdk:10.0 → dotnet/aspnet:10.0, installs mercurial. Listens on port 80 and exposes /var/cache/hgresume and /var/vcs/public.
• docker-compose.yaml — local run against a host Mercurial repo tree.

Configuration (environment variables)

Variable	Default	Purpose
HGRESUME_CACHE_PATH	/var/cache/hgresume	bundle + transaction cache
HGRESUME_REPO_PATHS	/var/vcs/public;/var/vcs/private	;-separated repo search paths
HGRESUME_MAINTENANCE_FILE	<cache>/maintenance_message.txt	non-empty file ⇒ 503 maintenance mode
HGRESUME_MAX_REQUEST_BODY_SIZE	30000000	max request body bytes (Kestrel; raise for whole-bundle pushes)
ASPNETCORE_URLS	http://+:80	listen address

Build & run

docker compose up --build
# or:
podman build -t hgresume:test -f csharp/Dockerfile csharp
podman run -d --name hgresume -p 8034:80 \
  -v /path/to/repos:/var/vcs/public \
  hgresume:test
curl -i http://localhost:8034/api/v03/isAvailable

Tests

The HTTP-level suite builds the image, runs it in a container, seeds fixture repos, and exercises the protocol end-to-end:

cd csharp
./run-tests.sh          # or: pwsh ./run-tests.ps1

Useful env overrides: HGRESUME_IMAGE, HGRESUME_PORT, HGRESUME_SKIP_BUILD, and HGRESUME_BASE_URL + HGRESUME_CONTAINER (to run the tests against an already-running container).

CI

.github/workflows/docker-image.yml builds the C# image on push to master and, on a pull request, pushes it to GHCR tagged pr-<number> (multi-arch amd64/arm64):

docker pull ghcr.io/sillsdev/hgresume:pr-<number>

Maintenance mode

To suspend the API, place a text file at HGRESUME_MAINTENANCE_FILE (default /var/cache/hgresume/maintenance_message.txt) with an explanation. Clients receive that message with HTTP 503.