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sync: Support pluggable remote helpers for smart sync manifest server.

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Introduce support for pluggable remote helpers (declared via the
optional 'helper' attribute in <manifest-server>) to dynamically resolve
proxy addresses. Route the XML-RPC manifest server connection through
the resolved proxy.

Bug: b/517477903
Change-Id: I3b6b8ea2640bb077521df4b4a9e8a34a8c6ecdad
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/591642
Tested-by: Rahul Yadav <yadavrah@google.com>
Commit-Queue: Rahul Yadav <yadavrah@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>
This commit is contained in:
Rahul Yadav
2026-06-08 15:28:23 +00:00
committed by gerrit-scoped@luci-project-accounts.iam.gserviceaccount.com
parent cd307a6089
commit 39c0b60900
6 changed files with 431 additions and 32 deletions
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@@ -27,13 +27,44 @@ the [`<manifest-server>` element](manifest-format.md#Element-manifest_server)
element. This is how the client knows what service to talk to.
```xml
<manifest-server url="https://example.com/your/manifest/server/url" />
<manifest-server url="https://example.com/your/manifest/server/url"
helper="repo-remote-helper-name" />
```
If the URL starts with `persistent-`, then the
[`git-remote-persistent-https` helper](https://github.com/git/git/blob/HEAD/contrib/persistent-https/README)
is used to communicate with the server.
### Pluggable Remote Helpers
For custom proxying or authentication, Repo supports pluggable remote helpers.
You can declare a helper binary via the optional `helper` attribute on the
`<manifest-server>` element.
If the `helper` attribute is present in `<manifest-server>`:
1. Repo searches your system `PATH` for the specified helper binary (e.g.,
`repo-remote-sso`). If the helper cannot be found in `PATH`, Repo will raise
a `SmartSyncError` and abort the sync.
2. The helper is executed with the manifest server URL as its first argument:
```bash
<helper-binary-name> <url>
```
3. The helper must output a single-line JSON object on stdout and exit:
* On success, return `status: "ok"` and a loopback proxy URL (including
scheme, e.g., `http://127.0.0.1:999`):
```json
{"status": "ok", "message": "http://127.0.0.1:999"}
```
* On failure, return `status: "error"` and a detailed error message:
```json
{"status": "error", "message": "unauthorized"}
```
4. Repo routes the XML-RPC request through the returned proxy address.
**Timeout Constraint**: The remote helper must complete and exit within 10
seconds. If it hangs or exceeds this limit, Repo will force-terminate (`kill`)
the process and abort the synchronization.
## Credentials
Credentials may be specified directly in typical `username:password`