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package otbuiltin
import (
"bytes"
"errors"
"strconv"
"strings"
"time"
"unsafe"
glib "github.com/ostreedev/ostree-go/pkg/glibobject"
)
// #cgo pkg-config: ostree-1
// #include <stdlib.h>
// #include <glib.h>
// #include <ostree.h>
// #include "builtin.go.h"
import "C"
// Declare gobal variable for options
var pruneOpts pruneOptions
// Contains all of the options for pruning an ostree repo. Use
// NewPruneOptions() to initialize
type pruneOptions struct {
NoPrune bool // Only display unreachable objects; don't delete
RefsOnly bool // Only compute reachability via refs
DeleteCommit string // Specify a commit to delete
KeepYoungerThan time.Time // All commits older than this date will be pruned
Depth int // Only traverse depths (integer) parents for each commit (default: -1=infinite)
StaticDeltasOnly int // Change the behavior of --keep-younger-than and --delete-commit to prune only the static delta files
}
// Instantiates and returns a pruneOptions struct with default values set
func NewPruneOptions() pruneOptions {
po := new(pruneOptions)
po.Depth = -1
return *po
}
// Search for unreachable objects in the repository given by repoPath. Removes the
// objects unless pruneOptions.NoPrune is specified
func Prune(repoPath string, options pruneOptions) (string, error) {
pruneOpts = options
// attempt to open the repository
repo, err := OpenRepo(repoPath)
if err != nil {
return "", err
}
var pruneFlags C.OstreeRepoPruneFlags
var numObjectsTotal int
var numObjectsPruned int
var objSizeTotal uint64
var gerr = glib.NewGError()
var cerr = (*C.GError)(gerr.Ptr())
defer C.free(unsafe.Pointer(cerr))
var cancellable *glib.GCancellable
if !pruneOpts.NoPrune && !glib.GoBool(glib.GBoolean(C.ostree_repo_is_writable(repo.native(), &cerr))) {
return "", generateError(cerr)
}
cerr = nil
if strings.Compare(pruneOpts.DeleteCommit, "") != 0 {
if pruneOpts.NoPrune {
return "", errors.New("Cannot specify both pruneOptions.DeleteCommit and pruneOptions.NoPrune")
}
if pruneOpts.StaticDeltasOnly > 0 {
if glib.GoBool(glib.GBoolean(C.ostree_repo_prune_static_deltas(repo.native(), C.CString(pruneOpts.DeleteCommit), (*C.GCancellable)(cancellable.Ptr()), &cerr))) {
return "", generateError(cerr)
}
} else if err = deleteCommit(repo, pruneOpts.DeleteCommit, cancellable); err != nil {
return "", err
}
}
if !pruneOpts.KeepYoungerThan.IsZero() {
if pruneOpts.NoPrune {
return "", errors.New("Cannot specify both pruneOptions.KeepYoungerThan and pruneOptions.NoPrune")
}
if err = pruneCommitsKeepYoungerThanDate(repo, pruneOpts.KeepYoungerThan, cancellable); err != nil {
return "", err
}
}
if pruneOpts.RefsOnly {
pruneFlags |= C.OSTREE_REPO_PRUNE_FLAGS_REFS_ONLY
}
if pruneOpts.NoPrune {
pruneFlags |= C.OSTREE_REPO_PRUNE_FLAGS_NO_PRUNE
}
formattedFreedSize := C.GoString((*C.char)(C.g_format_size_full((C.guint64)(objSizeTotal), 0)))
var buffer bytes.Buffer
buffer.WriteString("Total objects: ")
buffer.WriteString(strconv.Itoa(numObjectsTotal))
if numObjectsPruned == 0 {
buffer.WriteString("\nNo unreachable objects")
} else if pruneOpts.NoPrune {
buffer.WriteString("\nWould delete: ")
buffer.WriteString(strconv.Itoa(numObjectsPruned))
buffer.WriteString(" objects, freeing ")
buffer.WriteString(formattedFreedSize)
} else {
buffer.WriteString("\nDeleted ")
buffer.WriteString(strconv.Itoa(numObjectsPruned))
buffer.WriteString(" objects, ")
buffer.WriteString(formattedFreedSize)
buffer.WriteString(" freed")
}
return buffer.String(), nil
}
// Delete an unreachable commit from the repo
func deleteCommit(repo *Repo, commitToDelete string, cancellable *glib.GCancellable) error {
var refs *glib.GHashTable
var hashIter glib.GHashTableIter
var hashkey, hashvalue C.gpointer
var gerr = glib.NewGError()
var cerr = (*C.GError)(gerr.Ptr())
defer C.free(unsafe.Pointer(cerr))
if glib.GoBool(glib.GBoolean(C.ostree_repo_list_refs(repo.native(), nil, (**C.GHashTable)(refs.Ptr()), (*C.GCancellable)(cancellable.Ptr()), &cerr))) {
return generateError(cerr)
}
C.g_hash_table_iter_init((*C.GHashTableIter)(hashIter.Ptr()), (*C.GHashTable)(refs.Ptr()))
for C.g_hash_table_iter_next((*C.GHashTableIter)(hashIter.Ptr()), &hashkey, &hashvalue) != 0 {
var ref string = C.GoString((*C.char)(hashkey))
var commit string = C.GoString((*C.char)(hashvalue))
if strings.Compare(commitToDelete, commit) == 0 {
var buffer bytes.Buffer
buffer.WriteString("Commit ")
buffer.WriteString(commitToDelete)
buffer.WriteString(" is referenced by ")
buffer.WriteString(ref)
return errors.New(buffer.String())
}
}
if err := repo.enableTombstoneCommits(); err != nil {
return err
}
if !glib.GoBool(glib.GBoolean(C.ostree_repo_delete_object(repo.native(), C.OSTREE_OBJECT_TYPE_COMMIT, C.CString(commitToDelete), (*C.GCancellable)(cancellable.Ptr()), &cerr))) {
return generateError(cerr)
}
return nil
}
// Prune commits but keep any younger than the given date regardless of whether they
// are reachable
func pruneCommitsKeepYoungerThanDate(repo *Repo, date time.Time, cancellable *glib.GCancellable) error {
var objects *glib.GHashTable
defer C.free(unsafe.Pointer(objects))
var hashIter glib.GHashTableIter
var key, value C.gpointer
defer C.free(unsafe.Pointer(key))
defer C.free(unsafe.Pointer(value))
var gerr = glib.NewGError()
var cerr = (*C.GError)(gerr.Ptr())
defer C.free(unsafe.Pointer(cerr))
if err := repo.enableTombstoneCommits(); err != nil {
return err
}
if !glib.GoBool(glib.GBoolean(C.ostree_repo_list_objects(repo.native(), C.OSTREE_REPO_LIST_OBJECTS_ALL, (**C.GHashTable)(objects.Ptr()), (*C.GCancellable)(cancellable.Ptr()), &cerr))) {
return generateError(cerr)
}
C.g_hash_table_iter_init((*C.GHashTableIter)(hashIter.Ptr()), (*C.GHashTable)(objects.Ptr()))
for C.g_hash_table_iter_next((*C.GHashTableIter)(hashIter.Ptr()), &key, &value) != 0 {
var serializedKey *glib.GVariant
defer C.free(unsafe.Pointer(serializedKey))
var checksum *C.char
defer C.free(unsafe.Pointer(checksum))
var objType C.OstreeObjectType
var commitTimestamp uint64
var commit *glib.GVariant = nil
C.ostree_object_name_deserialize((*C.GVariant)(serializedKey.Ptr()), &checksum, &objType)
if objType != C.OSTREE_OBJECT_TYPE_COMMIT {
continue
}
cerr = nil
if !glib.GoBool(glib.GBoolean(C.ostree_repo_load_variant(repo.native(), C.OSTREE_OBJECT_TYPE_COMMIT, checksum, (**C.GVariant)(commit.Ptr()), &cerr))) {
return generateError(cerr)
}
commitTimestamp = (uint64)(C.ostree_commit_get_timestamp((*C.GVariant)(commit.Ptr())))
if commitTimestamp < (uint64)(date.Unix()) {
cerr = nil
if pruneOpts.StaticDeltasOnly != 0 {
if !glib.GoBool(glib.GBoolean(C.ostree_repo_prune_static_deltas(repo.native(), checksum, (*C.GCancellable)(cancellable.Ptr()), &cerr))) {
return generateError(cerr)
}
} else {
if !glib.GoBool(glib.GBoolean(C.ostree_repo_delete_object(repo.native(), C.OSTREE_OBJECT_TYPE_COMMIT, checksum, (*C.GCancellable)(cancellable.Ptr()), &cerr))) {
return generateError(cerr)
}
}
}
}
return nil
}
|
