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base_symlink_factory.go
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/
base_symlink_factory.go
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package virtual
import (
"context"
"unicode/utf8"
remoteexecution "github.com/bazelbuild/remote-apis/build/bazel/remote/execution/v2"
"github.com/buildbarn/bb-remote-execution/pkg/proto/bazeloutputservice"
"github.com/buildbarn/bb-remote-execution/pkg/proto/outputpathpersistency"
"github.com/buildbarn/bb-storage/pkg/digest"
"github.com/buildbarn/bb-storage/pkg/filesystem"
"github.com/buildbarn/bb-storage/pkg/filesystem/path"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
type symlinkFactory struct{}
func (symlinkFactory) LookupSymlink(target []byte) NativeLeaf {
return symlink{target: target}
}
// BaseSymlinkFactory can be used to create simple immutable symlink nodes.
var BaseSymlinkFactory SymlinkFactory = symlinkFactory{}
type symlink struct {
placeholderFile
target []byte
}
func (f symlink) Readlink() (path.Parser, error) {
if !utf8.Valid(f.target) {
return nil, status.Error(codes.InvalidArgument, "Symbolic link contents are not valid UTF-8")
}
return path.NewUNIXParser(string(f.target))
}
func (f symlink) readlinkString() (string, error) {
targetParser, err := f.Readlink()
if err != nil {
return "", err
}
targetPath, scopeWalker := path.EmptyBuilder.Join(path.VoidScopeWalker)
if err := path.Resolve(targetParser, scopeWalker); err != nil {
return "", err
}
return targetPath.GetUNIXString(), nil
}
func (f symlink) GetBazelOutputServiceStat(digestFunction *digest.Function) (*bazeloutputservice.BatchStatResponse_Stat, error) {
target, err := f.readlinkString()
if err != nil {
return nil, err
}
return &bazeloutputservice.BatchStatResponse_Stat{
Type: &bazeloutputservice.BatchStatResponse_Stat_Symlink_{
Symlink: &bazeloutputservice.BatchStatResponse_Stat_Symlink{
Target: target,
},
},
}, nil
}
func (f symlink) AppendOutputPathPersistencyDirectoryNode(directory *outputpathpersistency.Directory, name path.Component) {
if target, err := f.readlinkString(); err == nil {
directory.Symlinks = append(directory.Symlinks, &remoteexecution.SymlinkNode{
Name: name.String(),
Target: target,
})
}
}
func (f symlink) VirtualGetAttributes(ctx context.Context, requested AttributesMask, attributes *Attributes) {
attributes.SetChangeID(0)
attributes.SetFileType(filesystem.FileTypeSymlink)
attributes.SetPermissions(PermissionsRead | PermissionsWrite | PermissionsExecute)
attributes.SetSizeBytes(uint64(len(f.target)))
}
func (f symlink) VirtualReadlink(ctx context.Context) ([]byte, Status) {
return f.target, StatusOK
}
func (f symlink) VirtualSetAttributes(ctx context.Context, in *Attributes, requested AttributesMask, out *Attributes) Status {
if _, ok := in.GetSizeBytes(); ok {
return StatusErrInval
}
f.VirtualGetAttributes(ctx, requested, out)
return StatusOK
}