[GoldArowana]

Summary

Dockerfile CMD instructions continued onto another physical line currently produce a truncated server command in the shared Modal/Daytona parser. Assemble logical instructions before extracting the last CMD, including comments, CRLF, whitespace after the escape character, and a valid top-level escape directive. Preserve the existing single-line, JSON-array joining, and invalid-JSON fallback behavior.

Type of Change

• Bug fix

Alignment Checklist

• Read .claude/docs/PRINCIPLES.md; this change preserves the existing runtime interfaces.
• Checked .claude/docs/INVARIANTS.md; no API, isolation, serialization, or architectural boundary changes.
• Ran the presubmit hooks and checked the changed files. Existing whole-tree lint diagnostics and the test-hook time limit are disclosed below.

RFC Status

• Not required: internal parser bug fix and regression tests.

Test Plan

• The actual parser reproduction fails on current main and passes on this branch.
• Added 23 regression/control cases for continued shell/JSON commands, comments and blank lines, escape directives, continued non-CMD instructions, and existing fallback behavior.
• The repository test hook reached its built-in 300-second limit without a test failure. The same test selection was then run to completion with a 600-second outer limit. Special optional environments, integration, network and Docker tests remain excluded by the hook's selection.
• Both changed files pass Ruff lint, Ruff formatting and usort.
• The whole-tree lint hook reports the same diagnostics on the base and this branch: 47 pre-existing formatting findings and the existing import-sort findings. The only output difference is one additional correctly formatted test file.
• Local tests use Python 3.13; upstream Python 3.11/3.12 CI remains the separate compatibility check.

Claude Code Review

N/A — prepared with Codex assistance. An independent review checked the parser behavior, baseline reproduction, compatibility controls, and the final diff.

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Note

Low Risk
Internal Dockerfile text parsing only; fixes command extraction without changing public APIs or runtime interfaces.

Overview
parse_dockerfile_cmd no longer stops at the first physical line of a CMD, so multi-line Dockerfiles no longer yield truncated server commands for Daytona/runtime config.

The parser now stitches logical Dockerfile instructions using line-ending escapes (respecting an optional top-level # escape= directive), then picks the last CMD as before. Exec-form JSON joining and invalid-JSON fallback are unchanged.

Adds tests/test_core/test_server_config.py with regression cases (continuations, CRLF, comments, escape directives, and non-CMD continuations) loaded directly from the module so optional container packages are not required.

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