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get.go
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get.go
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package gxutil
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"time"
stump "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
}
stump.VLog("Target directory already exists but isn't a valid package, cleaning up...")
if oErr := os.RemoveAll(out); oErr != nil {
stump.Error("cannot purge existing target directory:", oErr)
return nil, oErr
}
}
if err != nil && !os.IsNotExist(err) {
return nil, err
}
if err := pm.tryFetch(hash, out); err != nil {
return nil, err
}
err = FindPackageInDir(&pkg, out)
if err != nil {
return nil, err
}
return &pkg, nil
}
func (pm *PM) CacheAndLinkPackage(ref, cacheloc, out string) error {
if err := pm.tryFetch(ref, cacheloc); err != nil {
return err
}
finfo, err := os.Lstat(out)
switch {
case err == nil:
if finfo.Mode()&os.ModeSymlink != 0 {
target, err := os.Readlink(out)
if err != nil {
return err
}
// expecting 'ref' to be '/ipfs/QmFoo/pkg'
if target != cacheloc {
panic("not handling dep changes yet")
}
// Link already exists
return nil
} else {
// TODO: should we force these to be links?
// we want to support people just cloning packages into place here, so how should we handle it here?
panic("not yet handling non-linked packages...")
}
case os.IsNotExist(err):
// ok
default:
return err
}
if err := os.MkdirAll(filepath.Dir(out), 0755); err != nil {
return err
}
// dir where the link goes
linkloc, _ := filepath.Split(out)
// relative path from link to cache
rel, err := filepath.Rel(linkloc, cacheloc)
if err != nil {
return err
}
return os.Symlink(rel, out)
}
func (pm *PM) tryFetch(hash, target string) error {
temp := target + ".part"
// check if already downloaded
_, err := os.Stat(target)
if err == nil {
stump.VLog("already fetched %s", target)
return nil
}
// check if a fetch was previously started and failed, cleanup if found
_, err = os.Stat(temp)
if err == nil {
stump.VLog("Found previously failed fetch, cleaning up...")
if err := os.RemoveAll(temp); err != nil {
stump.Error("cleaning up previous aborted transfer: %s", err)
}
}
begin := time.Now()
stump.VLog(" - fetching %s via ipfs api", hash)
defer func() {
stump.VLog(" - fetch finished in %s", time.Since(begin))
}()
tries := 3
for i := 0; i < tries; i++ {
if err := pm.Shell().Get(hash, temp); err != nil {
stump.Error("from shell.Get(): %v", err)
rmerr := os.RemoveAll(temp)
if rmerr != nil {
stump.Error("cleaning up temp download directory: %s", rmerr)
}
if i == tries-1 {
return err
}
stump.Log("retrying fetch %s after a second...", hash)
time.Sleep(time.Second)
} else {
/*
if err := chmodR(temp, 0444); err != nil {
return err
}
*/
return os.Rename(temp, target)
}
}
panic("unreachable")
}
func chmodR(dir string, perm os.FileMode) error {
return filepath.Walk(dir, func(p string, info os.FileInfo, err error) error {
if p == dir {
return nil
}
if err == nil {
if info.Mode()&os.ModeSymlink != 0 {
return nil
}
perm := perm
if info.IsDir() {
perm |= 0111
}
return os.Chmod(p, perm)
}
return nil
})
}
func FindPackageInDir(pkg interface{}, dir string) error {
if err := LoadPackageFile(pkg, filepath.Join(dir, PkgFileName)); err == nil {
return nil
}
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
}