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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package modcmd
import (
"cmd/go/internal/cfg"
"encoding/json"
"os"
"cmd/go/internal/base"
"cmd/go/internal/modfetch"
"cmd/go/internal/modload"
"cmd/go/internal/module"
"cmd/go/internal/par"
)
var cmdDownload = &base.Command{
UsageLine: "go mod download [-json] [modules]",
Short: "download modules to local cache",
Long: `
Download downloads the named modules, which can be module patterns selecting
dependencies of the main module or module queries of the form path@version.
With no arguments, download applies to all dependencies of the main module.
The go command will automatically download modules as needed during ordinary
execution. The "go mod download" command is useful mainly for pre-filling
the local cache or to compute the answers for a Go module proxy.
By default, download reports errors to standard error but is otherwise silent.
The -json flag causes download to print a sequence of JSON objects
to standard output, describing each downloaded module (or failure),
corresponding to this Go struct:
type Module struct {
Path string // module path
Version string // module version
Error string // error loading module
Info string // absolute path to cached .info file
GoMod string // absolute path to cached .mod file
Zip string // absolute path to cached .zip file
Dir string // absolute path to cached source root directory
Sum string // checksum for path, version (as in go.sum)
GoModSum string // checksum for go.mod (as in go.sum)
Latest bool // would @latest resolve to this version?
}
See 'go help modules' for more about module queries.
`,
}
var downloadJSON = cmdDownload.Flag.Bool("json", false, "")
func init() {
cmdDownload.Run = runDownload // break init cycle
}
type moduleJSON struct {
Path string `json:",omitempty"`
Version string `json:",omitempty"`
Error string `json:",omitempty"`
Info string `json:",omitempty"`
GoMod string `json:",omitempty"`
Zip string `json:",omitempty"`
Dir string `json:",omitempty"`
Sum string `json:",omitempty"`
GoModSum string `json:",omitempty"`
Latest bool `json:",omitempty"`
}
func runDownload(cmd *base.Command, args []string) {
// Check whether modules are enabled and whether we're in a module.
if cfg.Getenv("GO111MODULE") == "off" {
base.Fatalf("go: modules disabled by GO111MODULE=off; see 'go help modules'")
}
if !modload.HasModRoot() && len(args) == 0 {
base.Fatalf("go mod download: no modules specified (see 'go help mod download')")
}
if len(args) == 0 {
args = []string{"all"}
}
var mods []*moduleJSON
var work par.Work
listU := false
listVersions := false
for _, info := range modload.ListModules(args, listU, listVersions) {
if info.Replace != nil {
info = info.Replace
}
if info.Version == "" && info.Error == nil {
// main module
continue
}
m := &moduleJSON{
Path: info.Path,
Version: info.Version,
}
mods = append(mods, m)
if info.Error != nil {
m.Error = info.Error.Err
continue
}
work.Add(m)
}
latest := map[string]string{} // path → version
if *downloadJSON {
// We need to populate the Latest field, but if the main module depends on a
// version newer than latest — or if the version requested on the command
// line is itself newer than latest — that's not trivial to determine from
// the info returned by ListModules. Instead, we issue a separate
// ListModules request for "latest", which should be inexpensive relative to
// downloading the modules.
var latestArgs []string
for _, m := range mods {
if m.Error != "" {
continue
}
latestArgs = append(latestArgs, m.Path+"@latest")
}
if len(latestArgs) > 0 {
for _, info := range modload.ListModules(latestArgs, listU, listVersions) {
if info.Version != "" {
latest[info.Path] = info.Version
}
}
}
}
work.Do(10, func(item interface{}) {
m := item.(*moduleJSON)
var err error
m.Info, err = modfetch.InfoFile(m.Path, m.Version)
if err != nil {
m.Error = err.Error()
return
}
m.GoMod, err = modfetch.GoModFile(m.Path, m.Version)
if err != nil {
m.Error = err.Error()
return
}
m.GoModSum, err = modfetch.GoModSum(m.Path, m.Version)
if err != nil {
m.Error = err.Error()
return
}
mod := module.Version{Path: m.Path, Version: m.Version}
m.Zip, err = modfetch.DownloadZip(mod)
if err != nil {
m.Error = err.Error()
return
}
m.Sum = modfetch.Sum(mod)
m.Dir, err = modfetch.Download(mod)
if err != nil {
m.Error = err.Error()
return
}
if latest[m.Path] == m.Version {
m.Latest = true
}
})
if *downloadJSON {
for _, m := range mods {
b, err := json.MarshalIndent(m, "", "\t")
if err != nil {
base.Fatalf("%v", err)
}
os.Stdout.Write(append(b, '\n'))
if m.Error != "" {
base.SetExitStatus(1)
}
}
} else {
for _, m := range mods {
if m.Error != "" {
base.Errorf("%s", m.Error)
}
}
base.ExitIfErrors()
}
}
|
