CI shell drift — nullvuild

CI shell drift is the gap between the shell, environment, paths, and defaults used by a local command and the shell that runs the same command in continuous integration.

A command can pass on a laptop and fail in CI even when the source code is identical. The shell may be bash, sh, PowerShell, or cmd. The working directory may be different. A lockfile, path separator, line ending, package manager cache, timezone, locale, or secret name may differ. Some failures look like flaky tests when the real cause is that the command is not running in the same execution context.

A useful CI shell note records the exact command, working directory, shell, OS image, Node/Python/runtime version, package manager version, environment variables needed, and whether the command depends on glob expansion or shell-specific syntax. It should also show the first failing line rather than only the final exit code.

The boundary is that CI shell drift is not an excuse to skip automation. It is a reminder to make the command explicit enough that a second environment can repeat it. If the command needs bash features, say so. If it needs a repo subdirectory, set it.

Practical interpretation: when a local CLI works but CI fails, compare shell, working directory, runtime version, and env names before rewriting application code.

Ci shell drift local command failure 2026 06 24

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Ci shell drift local command failure 2026 06 24

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