script/retry

#!/bin/bash
#
#  Copyright (c) 2026, The OpenThread Authors.
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#
#    Description:
#      Retry a command or GitHub Actions step script on failure.
#

set -euo pipefail

main()
{
    local max_attempts="${OT_RETRY_ATTEMPTS:-3}"
    local delay_seconds="${OT_RETRY_DELAY:-10}"
    local attempt=1
    local exit_code=0
    local -a cmd

    if [[ $# -eq 0 ]]; then
        echo "Usage: $0 <command> [args...]" >&2
        return 1
    fi

    if [[ $# -ge 1 && -f $1 && ! -x $1 ]]; then
        cmd=(bash --noprofile --norc -e -o pipefail "$@")
    else
        cmd=("$@")
    fi

    if [[ -n ${GITHUB_ACTIONS:-} && -d /etc/apt/apt.conf.d ]] && command -v sudo >/dev/null 2>&1; then
        sudo tee /etc/apt/apt.conf.d/zzz-ot-timeout >/dev/null <<'EOF' || true
Acquire::Retries "1";
Acquire::http::Timeout "10";
Acquire::https::Timeout "10";
EOF
        if [[ -f /etc/apt/apt-mirrors.txt ]]; then
            sudo sed -i 's|^\(http://azure\.archive\.ubuntu\.com/.*\)\tpriority:1$|\1\tpriority:4|' /etc/apt/apt-mirrors.txt || true
        fi
    fi

    while true; do
        exit_code=0
        "${cmd[@]}" || exit_code=$?

        if [[ ${exit_code} -eq 0 ]]; then
            return 0
        fi

        if [[ ${attempt} -ge ${max_attempts} ]]; then
            echo "Command failed after ${attempt} attempts (exit code ${exit_code}): ${cmd[*]}" >&2
            return "${exit_code}"
        fi

        echo "Attempt ${attempt}/${max_attempts} failed (exit code ${exit_code}). Retrying in ${delay_seconds}s..." >&2
        sleep "${delay_seconds}"
        attempt=$((attempt + 1))
    done
}

main "$@"