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feat: add Vercel Sandbox backend

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Adds Vercel Sandbox as a supported Hermes terminal backend alongside
existing providers (Local, Docker, Modal, SSH, Daytona, Singularity).

Uses the Vercel Python SDK to create/manage cloud microVMs, supports
snapshot-based filesystem persistence keyed by task_id, and integrates
with the existing BaseEnvironment shell contract and FileSyncManager
for credential/skill syncing.

Based on #17127 by @scotttrinh, cherry-picked onto current main.
This commit is contained in:
Scott Trinh 2026-04-29 18:20:53 +05:30 • committed by kshitij
parent 810d98e892
commit 5a1d4f6804
32 changed files with 2241 additions and 44 deletions
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21
tests/tools/test_modal_sandbox_fixes.py
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@ -7,6 +7,7 @@ Covers the bugs discovered while setting up TBLite evaluation:
4. ensurepip fix in Modal image builder
5. No swe-rex dependency — uses native Modal SDK
6. /home/ added to host prefix check
7. Vercel sandbox cwd normalization
"""
import os
@ -101,6 +102,26 @@ class TestCwdHandling:
config = _tt_mod._get_env_config()
assert config["cwd"] == "/root"
def test_host_path_replaced_for_vercel_sandbox(self, monkeypatch):
"""Host paths should be discarded for Vercel Sandbox."""
monkeypatch.setenv("TERMINAL_ENV", "vercel_sandbox")
monkeypatch.setenv("TERMINAL_CWD", "/Users/someone/projects")
config = _tt_mod._get_env_config()
assert config["cwd"] == "/vercel/sandbox"
def test_relative_path_replaced_for_vercel_sandbox(self, monkeypatch):
"""Relative cwd should not map into a remote Vercel sandbox."""
monkeypatch.setenv("TERMINAL_ENV", "vercel_sandbox")
monkeypatch.setenv("TERMINAL_CWD", "src")
config = _tt_mod._get_env_config()
assert config["cwd"] == "/vercel/sandbox"
def test_default_cwd_is_workspace_root_for_vercel_sandbox(self, monkeypatch):
monkeypatch.setenv("TERMINAL_ENV", "vercel_sandbox")
monkeypatch.delenv("TERMINAL_CWD", raising=False)
config = _tt_mod._get_env_config()
assert config["cwd"] == "/vercel/sandbox"
@pytest.mark.parametrize("backend", ["modal", "docker", "singularity", "daytona"])
def test_default_cwd_is_root_for_container_backends(self, backend, monkeypatch):
"""Container backends should default to /root, not ~."""