refactor: invert build tag semantics

Change build tags from opt-in to opt-out. Previously, features like
persistence storage backends required explicit build tags to be
included. This change simplifies the build process by enabling all
features by default and requiring build tags only to disable features.
For example, the `no_mysql` build tag disables MySQL support.

As a result, we can now simply run `go build` to build the wfx binary.

Signed-off-by: Michael Adler <michael.adler@siemens.com>

Author: michaeladler

.goreleaser.yml

@@ -16,12 +16,6 @@ builds:
   - id: wfx
     binary: wfx
     main: ./cmd/wfx
-    tags:
-      - sqlite
-      - postgres
-      - mysql
-      - plugin
-      - swagger
     flags:
       - -trimpath
       - -mod=readonly

DEVELOPMENT.md

@@ -10,7 +10,7 @@ To make tools like `gopls` (the Go language server) understand build tags,
 set the `GOFLAGS` environment variable accordingly, e.g.
 
 ```sh
-export GOFLAGS="-tags=integration,sqlite,mysql,postgres"
+export GOFLAGS="-tags=integration,testing"
 ```
 
 ## Persistence

Makefile

@@ -13,7 +13,7 @@ MAKEFLAGS += --jobs=$(shell nproc)
 DESTDIR ?=
 prefix ?= /usr/local
 
-GO_TAGS = sqlite,postgres,mysql,plugin,swagger
+GO_TAGS ?=
 
 export CGO_ENABLED=1
 
@@ -31,7 +31,7 @@ default:
 
 .PHONY: test
 test:
-	go test -race -coverprofile=coverage.out -covermode=atomic -timeout 30s ./... "--tags=sqlite,testing,plugin"
+	go test -race -coverprofile=coverage.out -covermode=atomic -timeout 30s ./... --tags=testing
 
 .PHONY: install
 install:

cmd/wfx/cmd/root/plugins_disabled.go

@@ -1,4 +1,4 @@
-//go:build !plugin
+//go:build no_plugin
 
 package root
 

cmd/wfx/cmd/root/plugins_disabled_test.go

@@ -1,4 +1,4 @@
-//go:build !plugin
+//go:build no_plugin
 
 package root
 

cmd/wfx/cmd/root/plugins_enabled.go

@@ -1,4 +1,4 @@
-//go:build plugin
+//go:build !no_plugin
 
 package root
 

cmd/wfx/cmd/root/plugins_test.go

@@ -1,4 +1,4 @@
-//go:build plugin
+//go:build !no_plugin
 
 package root
 

cmd/wfx/cmd/root/tag_mysql.go renamed to cmd/wfx/cmd/root/tag_no_mysql.go

@@ -1,4 +1,4 @@
-//go:build mysql
+//go:build no_mysql
 
 /*
  * SPDX-FileCopyrightText: 2025 Siemens AG
@@ -11,5 +11,5 @@
 package root
 
 func init() {
-	buildTags = append(buildTags, "mysql")
+	buildTags = append(buildTags, "no_mysql")
 }

cmd/wfx/cmd/root/tag_plugin.go renamed to cmd/wfx/cmd/root/tag_no_plugin.go

@@ -1,4 +1,4 @@
-//go:build plugin
+//go:build no_plugin
 
 /*
  * SPDX-FileCopyrightText: 2025 Siemens AG
@@ -11,5 +11,5 @@
 package root
 
 func init() {
-	buildTags = append(buildTags, "plugin")
+	buildTags = append(buildTags, "no_plugin")
 }

cmd/wfx/cmd/root/tag_no_postgres.go

@@ -0,0 +1,15 @@
+//go:build no_postgres
+
+/*
+ * SPDX-FileCopyrightText: 2025 Siemens AG
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Author: Michael Adler <michael.adler@siemens.com>
+ */
+
+package root
+
+func init() {
+	buildTags = append(buildTags, "no_postgres")
+}

cmd/wfx/cmd/root/tag_postgres.go renamed to cmd/wfx/cmd/root/tag_no_sqlite.go

@@ -1,4 +1,4 @@
-//go:build postgres
+//go:build no_sqlite
 
 /*
  * SPDX-FileCopyrightText: 2025 Siemens AG
@@ -11,5 +11,5 @@
 package root
 
 func init() {
-	buildTags = append(buildTags, "postgres")
+	buildTags = append(buildTags, "no_sqlite")
 }

cmd/wfx/cmd/root/tag_sqlite.go renamed to cmd/wfx/cmd/root/tag_no_swagger.go

@@ -1,4 +1,4 @@
-//go:build sqlite
+//go:build no_swagger
 
 /*
  * SPDX-FileCopyrightText: 2025 Siemens AG
@@ -11,5 +11,5 @@
 package root
 
 func init() {
-	buildTags = append(buildTags, "sqlite")
+	buildTags = append(buildTags, "no_swagger")
 }

cmd/wfx/cmd/root/tag_swagger.go

@@ -35,26 +35,21 @@ All binaries have extensive help texts when invoked with `--help`.
 
 ### Build Tags
 
-Go [build tags](https://pkg.go.dev/go/build) are used to select compiled-in support for various features.
-The following persistent storage selection build tags are available:
+Go [build tags](https://pkg.go.dev/go/build) can be used to opt-out from various features at compile-time.
+By default, all features are enabled. The following build tags are available:
 
 | Build Tag    | Description                                                      |
 | :----------- | :--------------------------------------------------------------- |
-| `sqlite`     | Enable built-in [SQLite](https://www.sqlite.org/) support        |
+| `no_sqlite`     | Disable built-in [SQLite](https://www.sqlite.org/) support    |
 | `libsqlite3` | Dynamically link against `libsqlite3`                            |
-| `postgres`   | Enable built-in [PostgreSQL](https://www.postgresql.org) support |
-| `mysql`      | Enable built-in [MySQL](https://www.mysql.com/) support          |
-| `plugin`     | Enable support for [external plugins](operations.md#plugins)     |
+| `no_postgres`   | Disable built-in [PostgreSQL](https://www.postgresql.org) support |
+| `no_mysql`      | Disable built-in [MySQL](https://www.mysql.com/) support          |
+| `no_plugin`     | Disable support for [external plugins](operations.md#plugins)     |
 
-By default, all built-in persistent storage options are enabled (wfx requires at least one persistent storage to save workflows and jobs).
+Note:
 
-Note that the selection of build tags can impact the size of the `wfx` binary file and may as well have implications for the software clearing process, including obligations that must be met.
-
-To build and compile-in, e.g., SQLite persistent storage support only, according `GO_TAGS` must be given:
-
-```bash
-make GO_TAGS=sqlite
-```
+- wfx requires at least one persistent storage to save workflows and jobs
+- build tags can impact the size of the `wfx` binary file and may as well have implications for the software clearing process, including obligations that must be met
 
 ### Debian
 

docs/installation.md

@@ -1,4 +1,4 @@
-//go:build mysql
+//go:build !no_mysql
 
 package entgo
 

internal/persistence/entgo/mysql.go

@@ -1,4 +1,4 @@
-//go:build integration && mysql
+//go:build integration && !no_mysql
 
 package entgo
 

internal/persistence/entgo/mysql_test.go

@@ -1,4 +1,4 @@
-//go:build postgres
+//go:build !no_postgres
 
 package entgo
 

internal/persistence/entgo/postgres.go

@@ -1,4 +1,4 @@
-//go:build integration && postgres
+//go:build integration && !no_postgres
 
 package entgo
 

internal/persistence/entgo/postgres_test.go

@@ -1,4 +1,4 @@
-//go:build sqlite
+//go:build !no_sqlite
 
 package entgo
 

internal/persistence/entgo/sqlite.go

@@ -1,4 +1,4 @@
-//go:build sqlite
+//go:build !no_sqlite
 
 package entgo
 

internal/persistence/entgo/sqlite_test.go

@@ -64,10 +64,10 @@ lint:
     #!/usr/bin/env bash
     set -euo pipefail
     export CGO_ENABLED=0
-    golangci-lint run -v --build-tags=sqlite,testing
-    staticcheck -tags=sqlite,testing ./...
+    golangci-lint run -v --build-tags=testing
+    staticcheck -tags=testing ./...
     go list ./... 2>/dev/null | sed -e 's,github.com/siemens/wfx/,,' | grep -v "^generated" | sort | uniq | while read -r pkg; do
-        if [[ "$pkg" == *tests* ]]; then
+        if [[ "$pkg" == *tests* ]] || [[ ! -d "$pkg" ]]; then
             continue
         fi
         file_count=$(find "$pkg" -maxdepth 1 -type f -name "*.go" | wc -l)
@@ -161,10 +161,7 @@ postgres-stop: (_container-stop "wfx-postgres")
 
 # Run PostgreSQL integration tests.
 postgres-integration-test:
-    #!/usr/bin/env bash
-    set -eux
-    # note: sqlite is needed for in-memory tests
-    go test -tags testing,integration,postgres,sqlite,plugin -count=1 ./...
+    go test -tags testing,integration,no_mysql -count=1 ./...
 
 # Start wfx and connect to Postgres database
 @postgres-wfx: postgres-start
@@ -231,10 +228,7 @@ mysql-generate-schema name:
 
 # Run MySQL integration tests.
 mysql-integration-test:
-    #!/usr/bin/env bash
-    set -eux
-    # note: sqlite is needed for in-memory tests
-    go test -tags testing,integration,mysql,sqlite,plugin -count=1 ./...
+    go test -tags testing,integration,no_postgres -count=1 ./...
 
 # Start wfx and connect to MySQL container.
 mysql-wfx: mysql-start

justfile

@@ -0,0 +1 @@
+./cmd/wfx/main.go

main.go

@@ -1,4 +1,4 @@
-//go:build swagger
+//go:build !no_swagger
 
 package spec