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Deep Down the Rabbit Hole: Bash, OverlayFS, and a 30-Year-Old Surprise
This blog post describes a recent debugging session that led through a surprising set of issues involving Bash, `getcwd()`, and OverlayFS. What started as a simple customer bug report turned into a deep dive worth sharing.
This blog post recounts a recent debugging session that uncovered a surprising set of issues involving Bash, getcwd(), and OverlayFS. We asked the key question: why couldn’t Bash determine the current working directory, and why did it fail with ENOTTY(Inappropriate ioctl for device)? While we resolved the issue with a simple build tweak, the investigation highlighted deeper lessons about portability assumptions, legacy code, and filesystem complexity.
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