Git info retrieval can stall in CI with full history + treeless checkout

[ChrisSargent]

Summary

In our GitHub Actions CI, Chromatic v15 stalls during git metadata retrieval only when using treeless partial checkout. The same commit/config completes locally and in CI runs without treeless checkout.

Environment

• Chromatic CLI/Action: v15.2.0 (chromaui/action pinned to v15.2.0 SHA)
• Repo: large Nx monorepo
• CI checkout settings where we can reproduce stalls:
  • fetch-depth: 0
  • filter: tree:0 (treeless partial clone)

Repro notes

• With filter: tree:0 enabled, Deploy & Test: Chromatic can stall for 30+ minutes during git-info retrieval.
• Without treeless checkout (filter removed), the same workflow proceeds normally (but checkout time increases significantly).
• Local run with debug enabled (yarn nx run fe-storybook:chromatic) completes successfully and does not hang.

Question

Is this a known interaction between Chromatic's git-history probing and treeless partial clones in CI?

If useful, we can provide additional sanitized debug logs from both CI and local runs.

[cgbl-90]

@ChrisSargent can you reach out to support@chromatic.com or send us a message via the in-app chat and share the CI logs for a few runs to investigate this issue further?