The platform's side of D6: git runs on the host, in a gitdir that is never
mounted into a container, so repository credentials never reach the model.
- adapters/git_workspace.py: LocalGitWorkspaceAdapter implementing
RepoWorkspacePort. Bare shared gitdir + a dev work tree mounted at
/workspace + one linked worktree per task under work/.worktrees/<id>
(excluded via the gitdir's info/exclude, not the project's .gitignore).
Explicit --git-dir/--work-tree, core.hooksPath=/dev/null, fsmonitor off,
quotePath off, GIT_CONFIG_NOSYSTEM, a private HOME per project, prompts off,
one asyncio.Lock per project. Token via GIT_ASKPASS reading a 0600 file; SSH
key as a 0600 temp file with a pinned known_hosts. Everything deleted in a
finally; only a *path* ever travels through the environment.
- The bug this phase existed to find: --git-dir=<shared> does not address a
linked worktree, so `git commit` in a task worktree committed straight to
`dev`. Operations now address <gitdir>/worktrees/<task_id> explicitly — and
never read the worktree's .git file, which a repository can rewrite.
- domain/platform/rules.py: is_blocked_address (pure) + assert_remote_host_allowed
(resolves, refuses if any address is loopback/private/link-local/metadata).
Shared by the git remote test and, later, every deploy target.
- ProjectExternalGit domain model + repository; container_delivery wires the
real adapter behind GIT_WORKSPACE=local with a resolver that joins the
project, its repo and its (decrypted) credentials.
Tests: 394 API (+48) against real git and a local bare repo; ruff and mypy clean.
Report: docs/plan/reports/agent-3-phase-2.md
mjalmoudy94
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