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datadirsetup.go
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/
datadirsetup.go
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// Copyright 2015 The rkt Authors
//
// 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 testutils
import (
"crypto/sha1"
"fmt"
"io"
"os"
"path/filepath"
"github.com/coreos/rkt/pkg/group"
"github.com/hashicorp/errwrap"
)
const casDbPerm = os.FileMode(0660)
var (
// dirs relative to data directory
dirs = map[string]os.FileMode{
".": os.FileMode(0750 | os.ModeSetgid),
"tmp": os.FileMode(0750 | os.ModeSetgid),
// Cas directories.
// Please keep in sync with dist/init/systemd/tmpfiles.d/rkt.conf
// Make sure 'rkt' group can read/write some of the 'cas'
// directories so that users in the group can fetch images
"cas": os.FileMode(0770 | os.ModeSetgid),
"cas/db": os.FileMode(0770 | os.ModeSetgid),
"cas/imagelocks": os.FileMode(0770 | os.ModeSetgid),
"cas/imageManifest": os.FileMode(0770 | os.ModeSetgid),
"cas/blob": os.FileMode(0770 | os.ModeSetgid),
"cas/tmp": os.FileMode(0770 | os.ModeSetgid),
"cas/tree": os.FileMode(0700 | os.ModeSetgid),
"cas/treestorelocks": os.FileMode(0700 | os.ModeSetgid),
"locks": os.FileMode(0750 | os.ModeSetgid),
// Pods directories.
"pods": os.FileMode(0750 | os.ModeSetgid),
"pods/embryo": os.FileMode(0750 | os.ModeSetgid),
"pods/prepare": os.FileMode(0750 | os.ModeSetgid),
"pods/prepared": os.FileMode(0750 | os.ModeSetgid),
"pods/run": os.FileMode(0750 | os.ModeSetgid),
"pods/exited-garbage": os.FileMode(0750 | os.ModeSetgid),
"pods/garbage": os.FileMode(0750 | os.ModeSetgid),
}
)
func createFileWithPermissions(path string, uid int, gid int, perm os.FileMode) error {
_, err := os.OpenFile(path, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0666)
if err != nil {
if !os.IsExist(err) {
return err
}
// file exists
}
return setPermissions(path, uid, gid, perm)
}
func setPermissions(path string, uid int, gid int, perm os.FileMode) error {
if err := os.Chown(path, uid, gid); err != nil {
return errwrap.Wrap(fmt.Errorf("error setting %q directory group", path), err)
}
if err := os.Chmod(path, perm); err != nil {
return errwrap.Wrap(fmt.Errorf("error setting %q directory permissions", path), err)
}
return nil
}
func createDirStructure(dataDir string, gid int) error {
for dir, perm := range dirs {
path := filepath.Join(dataDir, dir)
if err := os.MkdirAll(path, perm); err != nil {
return errwrap.Wrap(fmt.Errorf("error creating %q directory", path), err)
}
if err := setPermissions(path, 0, gid, perm); err != nil {
return err
}
}
return nil
}
func setCasDbFilesPermissions(casDbPath string, gid int, perm os.FileMode) error {
casDbWalker := func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if info.Mode().IsRegular() {
if err := setPermissions(path, 0, gid, perm); err != nil {
return err
}
}
return nil
}
if err := filepath.Walk(casDbPath, casDbWalker); err != nil {
return err
}
return nil
}
func createDbFiles(casDbPath string, gid int, perm os.FileMode) error {
// HACK: to avoid some import cycles we don't use store.DbFilename
DbFilename := "ql.db"
dbPath := filepath.Join(casDbPath, DbFilename)
if err := createFileWithPermissions(dbPath, 0, gid, perm); err != nil {
return errwrap.Wrap(fmt.Errorf("error creating %s", dbPath), err)
}
// ql database uses a Write-Ahead Logging (WAL) file whose name is
// generated from the sha1 hash of the database name
h := sha1.New()
io.WriteString(h, DbFilename)
walFilename := fmt.Sprintf(".%x", h.Sum(nil))
walFilePath := filepath.Join(casDbPath, walFilename)
if err := createFileWithPermissions(walFilePath, 0, gid, perm); err != nil {
return errwrap.Wrap(fmt.Errorf("error creating %s", walFilename), err)
}
return nil
}
func setupDataDir(dataDir string) error {
gid, err := group.LookupGid("rkt")
if err != nil {
return err
}
if err := createDirStructure(dataDir, gid); err != nil {
return err
}
casDbPath := filepath.Join(dataDir, "cas", "db")
if err := setCasDbFilesPermissions(casDbPath, gid, casDbPerm); err != nil {
return err
}
if err := createDbFiles(casDbPath, gid, casDbPerm); err != nil {
return err
}
return nil
}