fix: make RPM runtime portable on Tumbleweed

packaging/postinst.sh

@@ -9,7 +9,8 @@ set -eu
 STORE_DIR="/var/lib/fenris"
 STORE_DB="${STORE_DIR}/observations.db"
 STORE_BAK="${STORE_DIR}/observations.db.bak"
-VENV_PYTHON="/opt/fenris/bin/python3"
+RUNTIME_PYTHON="/usr/bin/python3"
+VENDOR_DIR="/opt/fenris/vendor"
 
 case "${1:-}" in
     configure)
@@ -18,8 +19,8 @@ case "${1:-}" in
             if [ -f "${STORE_DB}" ]; then
                 cp "${STORE_DB}" "${STORE_BAK}" 2>/dev/null || true
             fi
-            if [ -x "${VENV_PYTHON}" ] && [ -f "${STORE_DB}" ]; then
-                "${VENV_PYTHON}" -c "
+            if [ -d "${VENDOR_DIR}" ] && [ -f "${STORE_DB}" ]; then
+                PYTHONPATH="${VENDOR_DIR}" "${RUNTIME_PYTHON}" -c "
 from fenris.store import migrate_to_latest
 from pathlib import Path
 n = migrate_to_latest(Path('${STORE_DB}'))