The export round-trip (`vm create` → `workspace prepare` → guest edit →
`workspace export`) exposed a reproducible failure on Debian bookworm
guests: `git read-tree HEAD --index-output=/tmp/...` returns exit 128
"unable to write new index file" when the target lives on tmpfs while
`.git` is on the workspace overlay. Move the temp index into
`$(git rev-parse --git-dir)` so it shares a filesystem with `.git/index`
and the lockfile + rename + hardlink dance git does internally works.
Alongside:
- new workspace-export smoke scenario that would have caught this at
the boundary between daemon and guest git
- `make smoke-fresh` = `smoke-clean && smoke` for release-time runs
that want first-install paths (migrations, image pull) stamped into
the coverage report
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Thales Maciel
e94e7c4dcc