113 lines
3.6 KiB
Bash
Executable File
113 lines
3.6 KiB
Bash
Executable File
#!/bin/bash
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# molecule-git-token-helper.sh — git credential helper for GitHub App tokens
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#
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# Fetches a fresh GitHub App installation token from the Molecule AI
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# platform endpoint GET /admin/github-installation-token on every git
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# push/fetch, so workspace containers never use an expired GH_TOKEN after
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# the ~60 min GitHub App token TTL.
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#
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# # Setup (called once at provision time or initial_prompt)
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#
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# git config --global \
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# "credential.https://github.com.helper" \
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# "!/workspace/scripts/molecule-git-token-helper.sh"
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#
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# # How git calls this helper
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#
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# git passes the action as the first positional arg. The protocol is:
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# get → output credentials on stdout (we handle this)
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# store → persist credentials (no-op — we never cache)
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# erase → revoke credentials (no-op — platform manages lifecycle)
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#
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# On `get`, git reads key=value pairs terminated by an empty line.
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# We must emit at minimum:
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# username=x-access-token
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# password=<token>
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# (blank line)
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#
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# # Auth
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#
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# The platform endpoint requires a valid workspace bearer token. The
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# token is stored at ${CONFIGS_DIR}/.auth_token (written by platform_auth.py
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# on first /registry/register). Workspace env var PLATFORM_URL defaults
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# to http://platform:8080.
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#
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# # Fallback
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#
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# If the platform endpoint is unreachable (e.g. network partition) or
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# returns non-200, the script exits 1 without printing credentials so git
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# will fall through to the next helper in the chain (if any). This
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# preserves the operator's fallback PAT from .env if present.
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#
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# # gh CLI re-auth (30-min cron)
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#
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# To also fix `gh` CLI auth, run this from a workspace cron prompt:
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#
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# token=$(bash /workspace/scripts/molecule-git-token-helper.sh _fetch_token)
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# echo "$token" | gh auth login --with-token
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#
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# (The _fetch_token private action returns only the raw token string.)
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#
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set -euo pipefail
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PLATFORM_URL="${PLATFORM_URL:-http://platform:8080}"
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CONFIGS_DIR="${CONFIGS_DIR:-/configs}"
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TOKEN_FILE="${CONFIGS_DIR}/.auth_token"
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ENDPOINT="${PLATFORM_URL}/admin/github-installation-token"
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# _fetch_token — internal helper; also callable directly from cron.
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# Outputs the raw token string on success; exits non-zero on failure.
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_fetch_token() {
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if [ ! -f "${TOKEN_FILE}" ]; then
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echo "[molecule-git-token-helper] .auth_token not found at ${TOKEN_FILE}" >&2
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exit 1
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fi
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bearer=$(cat "${TOKEN_FILE}" | tr -d '[:space:]')
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if [ -z "${bearer}" ]; then
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echo "[molecule-git-token-helper] .auth_token is empty" >&2
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exit 1
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fi
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response=$(curl -sf \
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-H "Authorization: Bearer ${bearer}" \
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-H "Accept: application/json" \
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--max-time 10 \
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"${ENDPOINT}" 2>&1) || {
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echo "[molecule-git-token-helper] platform request failed: ${response}" >&2
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exit 1
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}
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# Parse {"token":"ghs_...","expires_at":"..."} with sed (no jq dependency).
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token=$(echo "${response}" | sed -n 's/.*"token":"\([^"]*\)".*/\1/p')
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if [ -z "${token}" ]; then
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echo "[molecule-git-token-helper] empty token in platform response: ${response}" >&2
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exit 1
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fi
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echo "${token}"
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}
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ACTION="${1:-get}"
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case "${ACTION}" in
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get)
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token=$(_fetch_token) || exit 1
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# Emit git credential protocol response.
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printf 'username=x-access-token\n'
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printf 'password=%s\n' "${token}"
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printf '\n'
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;;
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store|erase)
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# No-op — the platform manages token lifecycle.
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;;
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_fetch_token)
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# Private action for cron-based gh auth login --with-token.
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_fetch_token
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;;
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*)
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echo "[molecule-git-token-helper] unknown action: ${ACTION}" >&2
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exit 1
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;;
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esac
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