BUG: parse_git_status returns detached=True when upstream branch name contains the word 'detached'

[devteamaegis]

What breaks

parse_git_status in packages/python-sdk/e2b/sandbox/_git/parse.py incorrectly sets detached=True and leaves current_branch/upstream unpopulated for a repository that is not in detached HEAD mode when the upstream tracking branch name contains the word detached (e.g., origin/detached-work).

When branch main tracks origin/detached-work, git status --porcelain=1 -b outputs ## main...origin/detached-work. The variable raw_branch is set to "main...origin/detached-work", so the condition "detached" in raw_branch on line 129 evaluates to True, triggering the detached-HEAD code path and returning completely wrong state.

AssertionError: BUG: 'detached' in upstream name causes false-positive: is_detached=True

Root cause

Line 128-130 in parse.py:

is_detached = raw_branch.startswith("HEAD (detached at ") or (
    "detached" in raw_branch
)

The "detached" in raw_branch sub-check matches any upstream ref whose name contains the word detached, not just actual detached-HEAD porcelain output.

Fix

Remove the "detached" in raw_branch sub-check. The raw_branch.startswith("HEAD (detached at ") check is sufficient for real detached HEAD, and the subsequent normalized_branch.startswith("HEAD") check on line 130 catches HEAD (no branch) and other HEAD variants.

[linear-code]

ENG-4211

[maxim-ultra]

Public repro angle that may help narrow this down: if the parser treats any occurrence of the word detached as the detached-head signal, an upstream branch like origin/feature/detached-session-fix can false-positive.

A small regression fixture could feed a normal branch status line such as:

## feature/detached-session-fix...origin/feature/detached-session-fix

and assert detached=False. The true detached case should probably be keyed to Git status text like HEAD detached at ... / ## HEAD (no branch) rather than a substring inside the branch name.

No private repo access or credentials are needed; this is just a public test-case suggestion.