forked from whyrusleeping/gx
/
get.go
91 lines (76 loc) · 1.68 KB
/
get.go
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package gxutil
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"time"
. "github.com/whyrusleeping/stump"
)
type ErrAlreadyInstalled struct {
pkg string
}
func IsErrAlreadyInstalled(err error) bool {
_, ok := err.(ErrAlreadyInstalled)
return ok
}
func (eai ErrAlreadyInstalled) Error() string {
return fmt.Sprintf("package %s already installed", eai.pkg)
}
func (pm *PM) GetPackageTo(hash, out string) (*Package, error) {
var pkg Package
_, err := os.Stat(out)
if err == nil {
err := FindPackageInDir(&pkg, out)
if err == nil {
return &pkg, nil
} else if !os.IsNotExist(err) {
return nil, err
}
}
if err != nil && !os.IsNotExist(err) {
return nil, err
}
begin := time.Now()
VLog(" - fetching %s via ipfs api", hash)
tries := 3
for i := 0; i < tries; i++ {
err = pm.Shell().Get(hash, out)
if err != nil {
Error("from shell.Get(): ", err)
if i == tries-1 {
return nil, err
}
Log("retrying fetch %s after a second...", hash)
time.Sleep(time.Second)
} else {
break
}
}
VLog(" - fetch finished in %s", time.Now().Sub(begin))
err = FindPackageInDir(&pkg, out)
if err != nil {
return nil, err
}
return &pkg, nil
}
func FindPackageInDir(pkg interface{}, dir string) error {
name, err := PackageNameInDir(dir)
if err != nil {
return err
}
return LoadPackageFile(pkg, filepath.Join(dir, name, PkgFileName))
}
func PackageNameInDir(dir string) (string, error) {
fs, err := ioutil.ReadDir(dir)
if err != nil {
return "", err
}
if len(fs) == 0 {
return "", fmt.Errorf("no package found in hashdir: %s", dir)
}
if len(fs) > 1 {
return "", fmt.Errorf("found multiple packages in hashdir: %s", dir)
}
return fs[0].Name(), nil
}