[Linux][CLI&UX] nemoclaw rebuild exits 0 when host-mount preflight validation fails

Description

`nemoclaw {sandbox} rebuild --yes` exits 0 when a preflight validation fails due to a missing host-mount source directory. The command correctly prints "Managed workload rebuild preflight failed: Invalid --host-mount: host directory does not exist" and correctly aborts without modifying the sandbox, but exits 0 instead of non-zero. Scripts and CI pipelines that check the exit code cannot detect this rebuild failure.


Platform scope: Reproduced on Linux x86_64 (Ubuntu 24.04); other platforms not tested.

Regression: Unknown — not verified on earlier versions.

OpenShell issue: No

Environment

Device:        Ubuntu 24.04 x86_64 server

OS:            Ubuntu 24.04.4 LTS

Architecture:  x86_64

Node.js:       v22.23.1

npm:           10.9.2

Docker:        29.6.1

OpenShell CLI: 0.0.101

NemoClaw:      v0.0.111

OpenClaw:      2026.7.1

Steps to Reproduce

1. Onboard a sandbox with a host mount:

   FIXTURE_DIR=$(mktemp -d) && chmod 755 "$FIXTURE_DIR"

   printf 'test' > "${FIXTURE_DIR}/alpha.txt"

   nemoclaw onboard --name hmt-lifecycle --host-mount "${FIXTURE_DIR}:/sandbox/host-share" --fresh --yes

2. Remove the mount source directory: mv "${FIXTURE_DIR}" "${FIXTURE_DIR}.removed"

3. Run: nemoclaw hmt-lifecycle rebuild --yes; echo "EXIT:$?"

Expected Result

Rebuild exits non-zero (exit 1) when preflight validation fails because the declared host-mount source directory is missing. Scripts can detect the failure via $?.

Actual Result

Managed workload rebuild preflight failed: Invalid --host-mount: host directory does not exist


EXIT:0

The sandbox was not rebuilt (correct), but the exit code is 0 despite the preflight failure.

Logs

$ nemoclaw hmt-lifecycle rebuild --yes

Managed workload rebuild preflight failed: Invalid --host-mount: host directory does not exist

$ echo $?

0

$ nemoclaw list

hmt-lifecycle is still in Ready state (no rebuild attempted — correct behavior, wrong exit code)