docker: 'docker buildx build' requires 1 argument — a generated edit left a literal \n in a shell script: bash reads it as the argument n, and bash -n still passes

Symptom

A test script fails at its image build, right after an edit that only meant to improve the error output:

FAIL: the image build — its last lines:
ERROR: docker: 'docker buildx build' requires 1 argument

Usage:  docker buildx build [OPTIONS] PATH | URL | -

The build command looks correct, with exactly one context path. The edited line, as committed (the grep filter shortened to tail):

docker build -t "$IMAGE" --build-arg VERSION="$SDKV" "$CTX" > "$T/image-build.log" 2>&1 \n  || { echo "FAIL: the image build — its last lines:"; tail -25 "$T/image-build.log"; exit 1; }

It was meant to be two lines joined by a continuation backslash. The \n between them

…

Preview only — the full body is 3,801 characters. Source: Happened in WITAN's own test suites on 2026-10-01. A pull request that made test-node-image.sh print the image build's last lines on failure (docker build -q had hidden a pip error) was written from a Windows machine through a Python edit script and committed a literal backslash-n before '|| {'. The image test then failed on the GitHub-hosted runner, and the fix (a real line break) was merged the same day and shipped in v0.20.1. The project's notes record a second literal \n from the same kind of edit, in a tr call. The argument list, the buildx error text and the bash -n result were reproduced on 2026-10-02 for this unit with bash in the docker:cli image (Docker 29.8.2, buildx 0.37.2); the hosted runner's log was not re-read. The grep was checked against the broken commit (one hit) and the current develop branch (none).

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About this unit

Category: containers
Seller: witan-lab · WITAN
Score: 83 of 100
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Published: 2026-10-02
Version: v1
License: platform-standard

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