It would be nice to be able to manage all my tool dependencies using the same method.

I guess the problem is that go get -tool does not support tags. Maybe migrate could include all the drivers by default and have another tag to exclude drivers?

fwiw, when you use go run -tags 'postgres', you can have migrate defined in your tool sections and it will use that version. Stashing this in a makefile seems to be a decent solution.

fwiw, when you use go run -tags 'postgres', you can have migrate defined in your tool sections and it will use that version. Stashing this in a makefile seems to be a decent solution.

I'm not sure this is true...

I have it added to my go.mod:

tool (
	github.com/apache/skywalking-eyes/cmd/license-eye
	github.com/golang-migrate/migrate/v4/cmd/migrate
	github.com/golangci/golangci-lint/cmd/golangci-lint
	github.com/goreleaser/goreleaser/v2
	github.com/sqlc-dev/sqlc/cmd/sqlc
)

However:

$  go run -tags 'postgres' migrate -path internal/dbase/metadatadb/migrations -database postgres://localhost/local_metadata up
package migrate is not in std (/opt/homebrew/Cellar/go/1.24.1/libexec/src/migrate)

With the following makefile commands:

migrate-up: ## Run database migrations up (loads .env if present)
	@set -o allexport; \
	if [ -f .env ]; then source .env; fi; \
	go run -tags 'postgres' github.com/golang-migrate/migrate/v4/cmd/migrate \
		-database "$$DATABASE_URL" \
		-path ./internal/database/migrations \
		up

migrate-down: ## Rollback the last migration (loads .env if present)
	@set -o allexport; \
	if [ -f .env ]; then source .env; fi; \
	go run -tags 'postgres' github.com/golang-migrate/migrate/v4/cmd/migrate \
		-database "$$DATABASE_URL" \
		-path ./internal/database/migrations \
		down 1

Without migrate in my tools directive I get:

 go-todo % make migrate-up
no required module provides package github.com/golang-migrate/migrate/v4/cmd/migrate; to add it:
	go get github.com/golang-migrate/migrate/v4/cmd/migrate
make: *** [migrate-up] Error 1

With migrate in my tools directive, I get:

√ go-todo % make migrate-up
1/u init_schema (25.483542ms)

tool (
	github.com/golang-migrate/migrate/v4/cmd/migrate
)

I don't have a firm grasp on the nuances of the tool directive, so if this is working in some kind of unexpected way, maybe someone can clarify.

?2 go-todo % go version
go version go1.24.1 darwin/arm64

Example repo: https://github.com/bcomnes/go-todo

@bcomnes I think what you describe is a side-effect.

When you have no tools included, do you still have a reference to github.com/golang-migrate/migrate/v4/cmd/migrate or the package it is included in within your go.mod?

My guess here is the tool definition is creating it, but since you are explicitly running it based on the go run and not go tool command, it is taking what it sees inside your mod file and running that, and that can use the tags.

When you have no tools included, do you still have a reference to github.com/golang-migrate/migrate/v4/cmd/migrate or the package it is included in within your go.mod?

No, nothing else pulls it in when the tools directive is removed.

My guess here is the tool definition is creating it, but since you are explicitly running it based on the go run and not go tool command, it is taking what it sees inside your mod file and running that, and that can use the tags.

It's not quite the desired outcome (using go tool) but it is close (defining the dep and version as a tool, and running it at the correct version, controlled by the mod file, afaict).

I propose adding a new file internal/cli/build.go with the following build constraints to control database/source driver imports:

//go:build !(aws_s3 || bitbucket || cassandra || clickhouse || cockroachdb || firebird || github || gitlab || go_bindata || godoc_vfs || google_cloud_storage || mongodb || mysql || neo4j || pgx || pgx5 || postgres || ql || redshift || rqlite || snowflake || spanner || sqlcipher || sqlite || sqlite3 || sqlserver || yugabytedb)
// +build !aws_s3,!bitbucket,!cassandra,!clickhouse,!cockroachdb,!firebird,!github,!gitlab,!go_bindata,!godoc_vfs,!google_cloud_storage,!mongodb,!mysql,!neo4j,!pgx,!pgx5,!postgres,!ql,!redshift,!rqlite,!snowflake,!spanner,!sqlcipher,!sqlite,!sqlite3,!sqlserver,!yugabytedb

package cli

import (
	_ "github.com/ClickHouse/clickhouse-go"
	_ "github.com/golang-migrate/migrate/v4/database/cassandra"
	_ "github.com/golang-migrate/migrate/v4/database/clickhouse"
	_ "github.com/golang-migrate/migrate/v4/database/cockroachdb"
	_ "github.com/golang-migrate/migrate/v4/database/firebird"
	_ "github.com/golang-migrate/migrate/v4/database/mongodb"
	_ "github.com/golang-migrate/migrate/v4/database/mysql"
	_ "github.com/golang-migrate/migrate/v4/database/neo4j"
	_ "github.com/golang-migrate/migrate/v4/database/pgx"
	_ "github.com/golang-migrate/migrate/v4/database/pgx/v5"
	_ "github.com/golang-migrate/migrate/v4/database/postgres"
	_ "github.com/golang-migrate/migrate/v4/database/ql"
	_ "github.com/golang-migrate/migrate/v4/database/redshift"
	_ "github.com/golang-migrate/migrate/v4/database/rqlite"
	_ "github.com/golang-migrate/migrate/v4/database/snowflake"
	_ "github.com/golang-migrate/migrate/v4/database/spanner"
	_ "github.com/golang-migrate/migrate/v4/database/sqlcipher"
	_ "github.com/golang-migrate/migrate/v4/database/sqlite"
	_ "github.com/golang-migrate/migrate/v4/database/sqlite3"
	_ "github.com/golang-migrate/migrate/v4/database/sqlserver"
	_ "github.com/golang-migrate/migrate/v4/database/yugabytedb"
	_ "github.com/golang-migrate/migrate/v4/source/aws_s3"
	_ "github.com/golang-migrate/migrate/v4/source/bitbucket"
	_ "github.com/golang-migrate/migrate/v4/source/github_ee"
	_ "github.com/golang-migrate/migrate/v4/source/gitlab"
	_ "github.com/golang-migrate/migrate/v4/source/go_bindata"
	_ "github.com/golang-migrate/migrate/v4/source/godoc_vfs"
	_ "github.com/golang-migrate/migrate/v4/source/google_cloud_storage"
)

This setup ensures that all database/source drivers are built by default when running go build without any -tags flags. The build constraints work as follows:

1. The //go:build directive (Go 1.17+ syntax) uses negation to exclude specific drivers
2. The legacy // +build format maintains compatibility with older Go versions
3. Drivers are only excluded when their specific tag is provided (e.g., -tags 'aws_s3' would exclude AWS S3 support)

$ CGO_ENABLED=0 go run -tags='aws_s3' ./cmd/migrate/
Usage: migrate OPTIONS COMMAND [arg...]
       migrate [ -version | -help ]
...
Source drivers: s3, file
Database drivers: stub
exit status 2

$ CGO_ENABLED=0 go run ./cmd/migrate/
Usage: migrate OPTIONS COMMAND [arg...]
       migrate [ -version | -help ]
...
Source drivers: go-bindata, github-ee, gitlab, bitbucket, s3, gcs, file, github, godoc-vfs
Database drivers: cockroach, redshift, cockroachdb, yugabytedb, firebird, firebirdsql, mysql, cassandra, rqlite, spanner, mongodb, snowflake, stub, postgresql, yugabyte, clickhouse, sqlite, ysql, neo4j, sqlserver, mongodb+srv, ql, sqlcipher, sqlite3, pgx, postgres, pgx5, crdb-postgres, pgx4
exit status 2

Further validation needed.

Thanks for the discussion! I'd rather wait for go tool to support build tags and not complicate our builds/codebase. Currently, build tags are all managed in the Makefile and I don't want another place to update when adding a new db or source driver.

Hi @dhui , thx for the response! 🙏 The existing Go community issue golang/go#71503 hasn't seen progress yet. Hoping to provide a temporary workaround here so other projects can manage tool dependencies in go.mod via go tool.