bug: while/case arg parsing hits MaxLoopIterations for 5-iteration loop

[chaliy]

Description

A while [[ $# -gt 0 ]]; do case ... shift 2 ... esac; done loop that should iterate 5 times hits MaxLoopIterations(100000), suggesting the loop counter isn't decrementing or the loop condition isn't being re-evaluated correctly after shift.

Reproduction

#!/bin/bash
set -e

while [[ $# -gt 0 ]]; do
    case $1 in
        --name)
            NAME="$2"
            shift 2
            ;;
        --value)
            VALUE="$2"
            shift 2
            ;;
        *)
            echo "Unknown: $1"
            exit 1
            ;;
    esac
done

echo "name=$NAME value=$VALUE"

Called as: script.sh --name foo --value bar (should iterate 2 times, shifting 2 each)

Expected: Prints name=foo value=bar, exits 0
Actual: ResourceLimit(MaxLoopIterations(100000))

Source

Found in microsoft-foundry/generate_deployment_url.sh (microsoft/github-copilot-for-azure) — the while/case argument parsing pattern is the most common pattern in skills scripts.

Cross-ref: tests/skills_tests.rs::exec_azure_generate_url (ignored, reproduces the bug)

Notes

The same pattern works in exec_azure_discover_rank which also uses while/case, so the issue may be specific to script file execution context (the failing test writes the script to VFS and executes it as a file, while the passing test also does this but has a different script structure).