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// +build ostree,cgo
package ostree
import (
"fmt"
"golang.org/x/sys/unix"
"os"
"path/filepath"
"runtime"
"syscall"
"time"
"unsafe"
"github.com/containers/storage/pkg/idtools"
"github.com/containers/storage/pkg/system"
glib "github.com/ostreedev/ostree-go/pkg/glibobject"
"github.com/ostreedev/ostree-go/pkg/otbuiltin"
"github.com/pkg/errors"
)
// #cgo pkg-config: glib-2.0 gobject-2.0 ostree-1
// #include <glib.h>
// #include <glib-object.h>
// #include <gio/gio.h>
// #include <stdlib.h>
// #include <ostree.h>
// #include <gio/ginputstream.h>
import "C"
func OstreeSupport() bool {
return true
}
func fixFiles(dir string, usermode bool) (bool, []string, error) {
var SkipOstree = errors.New("skip ostree deduplication")
var whiteouts []string
err := filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
if info.Mode()&(os.ModeNamedPipe|os.ModeSocket|os.ModeDevice) != 0 {
if !usermode {
stat, ok := info.Sys().(*syscall.Stat_t)
if !ok {
return errors.New("not syscall.Stat_t")
}
if stat.Rdev == 0 && (stat.Mode&unix.S_IFCHR) != 0 {
whiteouts = append(whiteouts, path)
return nil
}
}
// Skip the ostree deduplication if we encounter a file type that
// ostree does not manage.
return SkipOstree
}
if info.IsDir() {
if usermode {
if err := os.Chmod(path, info.Mode()|0700); err != nil {
return err
}
}
} else if usermode && (info.Mode().IsRegular()) {
if err := os.Chmod(path, info.Mode()|0600); err != nil {
return err
}
}
return nil
})
if err == SkipOstree {
return true, nil, nil
}
if err != nil {
return false, nil, err
}
return false, whiteouts, nil
}
// Create prepares the filesystem for the OSTREE driver and copies the directory for the given id under the parent.
func ConvertToOSTree(repoLocation, root, id string) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
repo, err := otbuiltin.OpenRepo(repoLocation)
if err != nil {
return errors.Wrap(err, "could not open the OSTree repository")
}
skip, whiteouts, err := fixFiles(root, os.Getuid() != 0)
if err != nil {
return errors.Wrap(err, "could not prepare the OSTree directory")
}
if skip {
return nil
}
if _, err := repo.PrepareTransaction(); err != nil {
return errors.Wrap(err, "could not prepare the OSTree transaction")
}
if skip {
return nil
}
commitOpts := otbuiltin.NewCommitOptions()
commitOpts.Timestamp = time.Now()
commitOpts.LinkCheckoutSpeedup = true
commitOpts.Parent = "0000000000000000000000000000000000000000000000000000000000000000"
branch := fmt.Sprintf("containers-storage/%s", id)
for _, w := range whiteouts {
if err := os.Remove(w); err != nil {
return errors.Wrap(err, "could not delete whiteout file")
}
}
if _, err := repo.Commit(root, branch, commitOpts); err != nil {
return errors.Wrap(err, "could not commit the layer")
}
if _, err := repo.CommitTransaction(); err != nil {
return errors.Wrap(err, "could not complete the OSTree transaction")
}
if err := system.EnsureRemoveAll(root); err != nil {
return errors.Wrap(err, "could not delete layer")
}
checkoutOpts := otbuiltin.NewCheckoutOptions()
checkoutOpts.RequireHardlinks = true
checkoutOpts.Whiteouts = false
if err := otbuiltin.Checkout(repoLocation, root, branch, checkoutOpts); err != nil {
return errors.Wrap(err, "could not checkout from OSTree")
}
for _, w := range whiteouts {
if err := unix.Mknod(w, unix.S_IFCHR, 0); err != nil {
return errors.Wrap(err, "could not recreate whiteout file")
}
}
return nil
}
func CreateOSTreeRepository(repoLocation string, rootUID int, rootGID int) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
_, err := os.Stat(repoLocation)
if err != nil && !os.IsNotExist(err) {
return err
} else if err != nil {
if err := idtools.MkdirAllAs(repoLocation, 0700, rootUID, rootGID); err != nil {
return errors.Wrap(err, "could not create OSTree repository directory: %v")
}
if _, err := otbuiltin.Init(repoLocation, otbuiltin.NewInitOptions()); err != nil {
return errors.Wrap(err, "could not create OSTree repository")
}
}
return nil
}
func openRepo(path string) (*C.struct_OstreeRepo, error) {
var cerr *C.GError
cpath := C.CString(path)
defer C.free(unsafe.Pointer(cpath))
pathc := C.g_file_new_for_path(cpath)
defer C.g_object_unref(C.gpointer(pathc))
repo := C.ostree_repo_new(pathc)
r := glib.GoBool(glib.GBoolean(C.ostree_repo_open(repo, nil, &cerr)))
if !r {
C.g_object_unref(C.gpointer(repo))
return nil, glib.ConvertGError(glib.ToGError(unsafe.Pointer(cerr)))
}
return repo, nil
}
func DeleteOSTree(repoLocation, id string) error {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
repo, err := openRepo(repoLocation)
if err != nil {
return err
}
defer C.g_object_unref(C.gpointer(repo))
branch := fmt.Sprintf("containers-storage/%s", id)
cbranch := C.CString(branch)
defer C.free(unsafe.Pointer(cbranch))
var cerr *C.GError
r := glib.GoBool(glib.GBoolean(C.ostree_repo_set_ref_immediate(repo, nil, cbranch, nil, nil, &cerr)))
if !r {
return glib.ConvertGError(glib.ToGError(unsafe.Pointer(cerr)))
}
return nil
}
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