refactor: extract set_db_vars and strip_template_block to lib/common.sh

Identical copies of _set_db_vars() and _strip_block() existed in
phase1, phase2, and phase8. Moved to lib/common.sh as set_db_vars()
and strip_template_block() (public API, no underscore prefix).
Removed dead _strip_block definition from phase8 (defined but never called).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

phase2_gitea_fedora.sh

@@ -27,46 +27,7 @@ phase_header 2 "Gitea on Fedora (Backup)"
 # Alias for template rendering — same template as Phase 1, different values
 DATA_PATH="$FEDORA_GITEA_DATA_PATH"
 
-# ---------------------------------------------------------------------------
-# DB-specific variables — same as phase1 (shared helper functions)
-# ---------------------------------------------------------------------------
-_set_db_vars() {
-  case "${GITEA_DB_TYPE}" in
-    postgres)
-      DB_DOCKER_IMAGE="postgres:16-alpine"
-      DB_ENV_VARS="      - POSTGRES_USER=${GITEA_DB_USER}
-      - POSTGRES_PASSWORD=${GITEA_DB_PASSWD}
-      - POSTGRES_DB=${GITEA_DB_NAME}"
-      DB_HEALTHCHECK='["CMD-SHELL", "pg_isready -U '"${GITEA_DB_USER}"'"]'
-      DB_DATA_DIR="postgresql/data"
-      ;;
-    mysql)
-      DB_DOCKER_IMAGE="mysql:8.0"
-      DB_ENV_VARS="      - MYSQL_ROOT_PASSWORD=${GITEA_DB_PASSWD}
-      - MYSQL_DATABASE=${GITEA_DB_NAME}
-      - MYSQL_USER=${GITEA_DB_USER}
-      - MYSQL_PASSWORD=${GITEA_DB_PASSWD}"
-      DB_HEALTHCHECK='["CMD", "mysqladmin", "ping", "-h", "localhost"]'
-      DB_DATA_DIR="mysql"
-      ;;
-    mssql)
-      DB_DOCKER_IMAGE="mcr.microsoft.com/mssql/server:2022-latest"
-      DB_ENV_VARS="      - ACCEPT_EULA=Y
-      - SA_PASSWORD=${GITEA_DB_PASSWD}"
-      # shellcheck disable=SC2089,SC2016
-      DB_HEALTHCHECK='["CMD-SHELL", "/opt/mssql-tools18/bin/sqlcmd -S localhost -U sa -P '"'"'${GITEA_DB_PASSWD}'"'"' -Q \"SELECT 1\" -C -N"]'
-      DB_DATA_DIR="mssql/data"
-      ;;
-  esac
-  # shellcheck disable=SC2090
-  export DB_DOCKER_IMAGE DB_ENV_VARS DB_HEALTHCHECK DB_DATA_DIR
-}
-
-_strip_block() {
-  local file="$1" start="$2" end="$3"
-  sed -i.bak "/${start}/,/${end}/d" "$file"
-  rm -f "${file}.bak"
-}
+# DB helpers and strip_template_block are in lib/common.sh
 
 # ---------------------------------------------------------------------------
 # Step 1: Create data directories on Fedora
@@ -114,10 +75,10 @@ else
   if [[ "$GITEA_DB_TYPE" == "sqlite3" ]]; then
     render_template "${SCRIPT_DIR}/templates/docker-compose-gitea.yml.tpl" "$TMPFILE" \
       "\${GITEA_VERSION} \${DATA_PATH} \${GITEA_CONTAINER_IP}"
-    _strip_block "$TMPFILE" "DB_SERVICE_START" "DB_SERVICE_END"
-    _strip_block "$TMPFILE" "DB_DEPENDS_START" "DB_DEPENDS_END"
+    strip_template_block "$TMPFILE" "DB_SERVICE_START" "DB_SERVICE_END"
+    strip_template_block "$TMPFILE" "DB_DEPENDS_START" "DB_DEPENDS_END"
   else
-    _set_db_vars
+    set_db_vars
     DB_CONTAINER_IP="${FEDORA_DB_IP}"
     export DB_CONTAINER_IP
     render_template "${SCRIPT_DIR}/templates/docker-compose-gitea.yml.tpl" "$TMPFILE" \
@@ -150,11 +111,11 @@ else
   if [[ "$GITEA_DB_TYPE" == "sqlite3" ]]; then
     render_template "${SCRIPT_DIR}/templates/app.ini.tpl" "$TMPFILE" \
       "\${GITEA_DOMAIN} \${GITEA_DB_TYPE} \${GITEA_SECRET_KEY}"
-    _strip_block "$TMPFILE" "EXTDB_BLOCK_START" "EXTDB_BLOCK_END"
+    strip_template_block "$TMPFILE" "EXTDB_BLOCK_START" "EXTDB_BLOCK_END"
   else
     render_template "${SCRIPT_DIR}/templates/app.ini.tpl" "$TMPFILE" \
       "\${GITEA_DOMAIN} \${GITEA_DB_TYPE} \${GITEA_SECRET_KEY} \${GITEA_DB_HOST} \${GITEA_DB_PORT} \${GITEA_DB_NAME} \${GITEA_DB_USER} \${GITEA_DB_PASSWD}"
-    _strip_block "$TMPFILE" "SQLITE_BLOCK_START" "SQLITE_BLOCK_END"
+    strip_template_block "$TMPFILE" "SQLITE_BLOCK_START" "SQLITE_BLOCK_END"
   fi
 
   scp_to FEDORA "$TMPFILE" "${DATA_PATH}/config/app.ini"