fix: isolate Jenkins sccache by job

scripts/jenkins-prepare-cargo-env.sh

@@ -8,6 +8,16 @@ set -euo pipefail
 
 ORIGINAL_HOME="${HOME:-}"
 CARGO_BUILD_HOME="${CARGO_BUILD_HOME:-$(dirname "${CARGO_HOME}")/home}"
+USER_CARGO_CONFIG=""
+WORKSPACE_TMP_ROOT="${WORKSPACE_TMP:-}"
+if [[ -z "${WORKSPACE_TMP_ROOT}" && -n "${WORKSPACE:-}" ]]; then
+  WORKSPACE_TMP_ROOT="${WORKSPACE}@tmp"
+fi
+if [[ -z "${WORKSPACE_TMP_ROOT}" ]]; then
+  WORKSPACE_TMP_ROOT="${CARGO_BUILD_HOME}"
+fi
+SCCACHE_SERVER_UDS="${SCCACHE_SERVER_UDS:-${WORKSPACE_TMP_ROOT}/sccache.sock}"
+SCCACHE_IDLE_TIMEOUT="${SCCACHE_IDLE_TIMEOUT:-0}"
 
 mkdir -p "${CARGO_HOME}" "${CARGO_TARGET_DIR}" "${SCCACHE_DIR}" "${CARGO_BUILD_HOME}"
 
@@ -25,20 +35,45 @@ for tool_dir in "${ORIGINAL_HOME}/.cargo/bin" /root/.cargo/bin /usr/local/cargo/
   fi
 done
 
+for candidate in \
+  "${ORIGINAL_HOME}/.cargo/config.toml" \
+  "${ORIGINAL_HOME}/.cargo/config" \
+  "/data/jenkins/.cargo/config.toml" \
+  "/data/jenkins/.cargo/config" \
+  "/etc/cargo/config.toml" \
+  "/etc/cargo/config"
+do
+  if [[ -f "${candidate}" ]]; then
+    USER_CARGO_CONFIG="${candidate}"
+    break
+  fi
+done
+
 export HOME="${CARGO_BUILD_HOME}"
 export CARGO_HOME
 export CARGO_TARGET_DIR
 export SCCACHE_DIR
+export SCCACHE_SERVER_UDS
+export SCCACHE_IDLE_TIMEOUT
 
-cat >"${CARGO_HOME}/config.toml" <<'CARGO_CONFIG'
+if [[ -n "${USER_CARGO_CONFIG}" ]]; then
+  install -m 0644 "${USER_CARGO_CONFIG}" "${CARGO_HOME}/config.toml"
+else
+  cat >"${CARGO_HOME}/config.toml" <<'CARGO_CONFIG'
 [registries.crates-io]
 protocol = "sparse"
 CARGO_CONFIG
+fi
 
 echo "[cargo-env] HOME=${HOME}"
 echo "[cargo-env] CARGO_HOME=${CARGO_HOME}"
 echo "[cargo-env] CARGO_TARGET_DIR=${CARGO_TARGET_DIR}"
 echo "[cargo-env] SCCACHE_DIR=${SCCACHE_DIR}"
+echo "[cargo-env] SCCACHE_SERVER_UDS=${SCCACHE_SERVER_UDS}"
+echo "[cargo-env] SCCACHE_IDLE_TIMEOUT=${SCCACHE_IDLE_TIMEOUT}"
+if [[ -n "${USER_CARGO_CONFIG}" ]]; then
+  echo "[cargo-env] USER_CARGO_CONFIG=${USER_CARGO_CONFIG}"
+fi
 if [[ -n "${RUSTUP_HOME:-}" ]]; then
   echo "[cargo-env] RUSTUP_HOME=${RUSTUP_HOME}"
 fi