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get.go
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get.go
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// Copyright (c) 2016 Pulcy.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package golang
import (
"errors"
"os"
"path/filepath"
"strings"
"sync"
"time"
"github.com/juju/errgo"
"github.com/mgutz/ansi"
log "github.com/op/go-logging"
"github.com/pulcy/pulsar/cache"
"github.com/pulcy/pulsar/util"
)
const (
srcDir = "src"
cacheValid = time.Hour * 12
)
var (
maskAny = errgo.MaskFunc(errgo.Any)
allGood = ansi.ColorFunc("")
updating = ansi.ColorFunc("cyan")
attention = ansi.ColorFunc("yellow")
envMutex sync.Mutex
gopath string
)
type GetFlags struct {
Package string
}
func init() {
gopath = os.Getenv("GOPATH")
}
// Get executes a `go get` with a cache support.
func Get(log *log.Logger, flags *GetFlags) error {
// Check GOPATH
if gopath == "" {
return maskAny(errors.New("Specify GOPATH"))
}
gopathDir := strings.Split(gopath, string(os.PathListSeparator))[0]
// Get cache dir
cachedir, cacheIsValid, err := cache.Dir(flags.Package, cacheValid)
if err != nil {
return maskAny(err)
}
if !cacheIsValid {
// Cache has become invalid
log.Info(updating("Refreshing cache of %s"), flags.Package)
// Execute `go get` towards the cache directory
if err := runGoGet(log, flags.Package, cachedir); err != nil {
return maskAny(err)
}
}
// Sync with local gopath
if err := os.MkdirAll(gopathDir, 0777); err != nil {
return maskAny(err)
}
if err := util.ExecPrintError(nil, "rsync", "-a", filepath.Join(cachedir, srcDir), gopathDir); err != nil {
return maskAny(err)
}
return nil
}
func runGoGet(log *log.Logger, pkg, gopath string) error {
envMutex.Lock()
defer envMutex.Unlock()
return func() error {
// Restore GOPATH on exit
defer os.Setenv("GOPATH", gopath)
// Set GOPATH
if err := os.Setenv("GOPATH", gopath); err != nil {
return maskAny(err)
}
//log.Info("GOPATH=%s", gopath)
return maskAny(util.ExecPrintError(log, "go", "get", pkg))
}()
}