reranker_backend_env.sh
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#!/bin/bash
#
# Shared helpers for mapping reranker backends to isolated virtualenvs.
#
set -euo pipefail
detect_rerank_backend() {
local project_root="$1"
local backend="${RERANK_BACKEND:-}"
if [[ -n "${backend}" ]]; then
printf '%s\n' "${backend}"
return 0
fi
backend="$(
awk '
/^ rerank:$/ { in_rerank=1; next }
in_rerank && /^ [^ ]/ { in_rerank=0 }
in_rerank && /^ backend:/ {
gsub(/"/, "", $2)
print $2
exit
}
' "${project_root}/config/config.yaml"
)"
if [[ -z "${backend}" ]]; then
backend="qwen3_vllm"
fi
printf '%s\n' "${backend}"
}
reranker_backend_venv_dir() {
local project_root="$1"
local backend="$2"
case "${backend}" in
qwen3_vllm) printf '%s/.venv-reranker\n' "${project_root}" ;;
qwen3_gguf) printf '%s/.venv-reranker-gguf\n' "${project_root}" ;;
qwen3_transformers) printf '%s/.venv-reranker-transformers\n' "${project_root}" ;;
bge) printf '%s/.venv-reranker-bge\n' "${project_root}" ;;
dashscope_rerank) printf '%s/.venv-reranker-dashscope\n' "${project_root}" ;;
*) printf '%s/.venv-reranker-%s\n' "${project_root}" "${backend}" ;;
esac
}
reranker_backend_requirements_file() {
local project_root="$1"
local backend="$2"
case "${backend}" in
qwen3_vllm) printf '%s/requirements_reranker_qwen3_vllm.txt\n' "${project_root}" ;;
qwen3_gguf) printf '%s/requirements_reranker_qwen3_gguf.txt\n' "${project_root}" ;;
qwen3_transformers) printf '%s/requirements_reranker_qwen3_transformers.txt\n' "${project_root}" ;;
bge) printf '%s/requirements_reranker_bge.txt\n' "${project_root}" ;;
dashscope_rerank) printf '%s/requirements_reranker_dashscope.txt\n' "${project_root}" ;;
*) return 1 ;;
esac
}