Description
What version of Go are you using (go version)?
$ go version go version go1.12.1 darwin/amd64
Does this issue reproduce with the latest release?
yes
What operating system and processor architecture are you using (go env)?
go env Output
$ go env GOARCH="amd64" GOBIN="" GOCACHE="/Users/mj/Library/Caches/go-build" GOEXE="" GOFLAGS="" GOHOSTARCH="amd64" GOHOSTOS="darwin" GOOS="darwin" GOPATH="/Users/mj/go" GOPROXY="https://goproxy.io" GORACE="" GOROOT="/usr/local/Cellar/go/1.12.1/libexec" GOTMPDIR="" GOTOOLDIR="/usr/local/Cellar/go/1.12.1/libexec/pkg/tool/darwin_amd64" GCCGO="gccgo" CC="clang" CXX="clang++" CGO_ENABLED="1" GOMOD="" CGO_CFLAGS="-g -O2" CGO_CPPFLAGS="" CGO_CXXFLAGS="-g -O2" CGO_FFLAGS="-g -O2" CGO_LDFLAGS="-g -O2" PKG_CONFIG="pkg-config" GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/xb/dsd0_2b92x7bsl92xlzj6fbm0000gn/T/go-build051189324=/tmp/go-build -gno-record-gcc-switches -fno-common"
What did you do?
main.go
package main
import (
"github.com/jinzhu/gorm"
_ "github.com/jinzhu/gorm/dialects/sqlite"
)
func main() {
db, err := gorm.Open("sqlite3", "test.db")
if err != nil {
panic("failed to connect database")
}
defer db.Close()
}
go mod init gorm-demo
go mod tidy
go mod graph
when you run go mod graph, you can see so many dependencies,
Output
github.com/jinzhu/gorm@v1.9.8 github.com/denisenkom/go-mssqldb@v0.0.0-20190423183735-731ef375ac02 github.com/jinzhu/gorm@v1.9.8 github.com/erikstmartin/go-testdb@v0.0.0-20160219214506-8d10e4a1bae5 github.com/jinzhu/gorm@v1.9.8 github.com/go-sql-driver/mysql@v1.4.1 github.com/jinzhu/gorm@v1.9.8 github.com/jinzhu/inflection@v0.0.0-20180308033659-04140366298a github.com/jinzhu/gorm@v1.9.8 github.com/jinzhu/now@v1.0.0 github.com/jinzhu/gorm@v1.9.8 github.com/lib/pq@v1.1.0 github.com/jinzhu/gorm@v1.9.8 github.com/mattn/go-sqlite3@v1.10.0just for mssql
github.com/denisenkom/go-mssqldb@v0.0.0-20190423183735-731ef375ac02 cloud.google.com/go@v0.37.4
github.com/denisenkom/go-mssqldb@v0.0.0-20190423183735-731ef375ac02 golang.org/x/crypto@v0.0.0-20190325154230-a5d413f7728c
github.com/denisenkom/go-mssqldb@v0.0.0-20190423183735-731ef375ac02 gopkg.in/check.v1@v1.0.0-20180628173108-788fd7840127
github.com/denisenkom/go-mssqldb@v0.0.0-20190423183735-731ef375ac02 gopkg.in/yaml.v2@v2.2.2just for cloud.google.com/go
cloud.google.com/go@v0.37.4 github.com/golang/mock@v1.2.0
cloud.google.com/go@v0.37.4 honnef.co/go/tools@v0.0.0-20190106161140-3f1c8253044a
cloud.google.com/go@v0.37.4 google.golang.org/grpc@v1.19.0
cloud.google.com/go@v0.37.4 google.golang.org/genproto@v0.0.0-20190404172233-64821d5d2107
cloud.google.com/go@v0.37.4 google.golang.org/api@v0.3.1
cloud.google.com/go@v0.37.4 golang.org/x/tools@v0.0.0-20190312170243-e65039ee4138
cloud.google.com/go@v0.37.4 golang.org/x/time@v0.0.0-20181108054448-85acf8d2951c
cloud.google.com/go@v0.37.4 golang.org/x/text@v0.3.1-0.20180807135948-17ff2d5776d2
cloud.google.com/go@v0.37.4 golang.org/x/sync@v0.0.0-20190227155943-e225da77a7e6
cloud.google.com/go@v0.37.4 golang.org/x/oauth2@v0.0.0-20190226205417-e64efc72b421
cloud.google.com/go@v0.37.4 golang.org/x/lint@v0.0.0-20190301231843-5614ed5bae6f
cloud.google.com/go@v0.37.4 golang.org/x/exp@v0.0.0-20190121172915-509febef88a4
cloud.google.com/go@v0.37.4 go.opencensus.io@v0.20.1
cloud.google.com/go@v0.37.4 github.com/jstemmer/go-junit-report@v0.0.0-20190106144839-af01ea7f8024
cloud.google.com/go@v0.37.4 github.com/googleapis/gax-go/v2@v2.0.4
cloud.google.com/go@v0.37.4 github.com/google/pprof@v0.0.0-20181206194817-3ea8567a2e57
cloud.google.com/go@v0.37.4 github.com/google/martian@v2.1.0+incompatible
cloud.google.com/go@v0.37.4 github.com/google/go-cmp@v0.2.0
cloud.google.com/go@v0.37.4 github.com/google/btree@v0.0.0-20180813153112-4030bb1f1f0c
cloud.google.com/go@v0.37.4 github.com/golang/protobuf@v1.2.0and many more ....
What did you expect to see?
what if i only use postgres db, please don't install mssql, sqlite dependencies for me.
i'm not sure this feature calls, maybe conditional dependencies ?
this pattern is common in some library that as a provider .....
What did you see instead?
a huge dependencies tree
Extra information (FYI)
i was a ruby on rails developer, as my experience, package management in node.js is sucking, big node_modules, installed failed, unmet dependencies ...
however in ruby world, package management (bundler) is nearly perfect, maybe go mod designer can learn something from that
https://bundler.io/man/gemfile.5.html#INSTALL_IF
https://bundler.io/v1.10/whats_new.html#install-if
https://bundler.io/guides/groups.html