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output_hierarchy.go
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output_hierarchy.go
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package builder
import (
"context"
"os"
"sort"
remoteexecution "github.com/bazelbuild/remote-apis/build/bazel/remote/execution/v2"
"github.com/buildbarn/bb-storage/pkg/blobstore"
"github.com/buildbarn/bb-storage/pkg/blobstore/buffer"
"github.com/buildbarn/bb-storage/pkg/digest"
"github.com/buildbarn/bb-storage/pkg/filesystem"
"github.com/buildbarn/bb-storage/pkg/filesystem/path"
"github.com/buildbarn/bb-storage/pkg/util"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/encoding/protowire"
"google.golang.org/protobuf/proto"
)
// OutputNode is a node in a directory hierarchy that contains one or
// more locations where output directories and files are expected.
type outputNode struct {
directoriesToUpload map[path.Component][]string
filesToUpload map[path.Component][]string
pathsToUpload map[path.Component][]string
subdirectories map[path.Component]*outputNode
}
func (on *outputNode) getSubdirectoryNames() []path.Component {
l := make(path.ComponentsList, 0, len(on.subdirectories))
for k := range on.subdirectories {
l = append(l, k)
}
sort.Sort(l)
return l
}
func sortToUpload(m map[path.Component][]string) []path.Component {
l := make(path.ComponentsList, 0, len(m))
for k := range m {
l = append(l, k)
}
sort.Sort(l)
return l
}
// NewOutputDirectory creates a new outputNode that is in the initial
// state. It contains no locations where output directories or files are
// expected.
func newOutputDirectory() *outputNode {
return &outputNode{
directoriesToUpload: map[path.Component][]string{},
filesToUpload: map[path.Component][]string{},
pathsToUpload: map[path.Component][]string{},
subdirectories: map[path.Component]*outputNode{},
}
}
// CreateParentDirectories is recursive invoked by
// OutputHierarchy.CreateParentDirectories() to create parent
// directories of locations where output directories and files are
// expected.
func (on *outputNode) createParentDirectories(d ParentPopulatableDirectory, dPath *path.Trace) error {
for _, name := range on.getSubdirectoryNames() {
childPath := dPath.Append(name)
if err := d.Mkdir(name, 0o777); err != nil && !os.IsExist(err) {
return util.StatusWrapf(err, "Failed to create output parent directory %#v", childPath.GetUNIXString())
}
// Recurse if we need to create one or more directories within.
if child := on.subdirectories[name]; len(child.subdirectories) > 0 || len(child.directoriesToUpload) > 0 {
childDirectory, err := d.EnterParentPopulatableDirectory(name)
if err != nil {
return util.StatusWrapf(err, "Failed to enter output parent directory %#v", childPath.GetUNIXString())
}
err = child.createParentDirectories(childDirectory, childPath)
childDirectory.Close()
if err != nil {
return err
}
}
}
// Although REv2 explicitly documents that only parents of
// output directories are created (i.e., not the output
// directory itself), Bazel changed its behaviour and now
// creates output directories when using local execution. See
// these issues for details:
//
// https://github.com/bazelbuild/bazel/issues/6262
// https://github.com/bazelbuild/bazel/issues/6393
//
// Considering that the 'output_directories' field is deprecated
// in REv2.1 anyway, be consistent with Bazel's local execution.
// Once Bazel switches to REv2.1, it will be forced to solve
// this matter in a protocol conforming way.
for _, name := range sortToUpload(on.directoriesToUpload) {
if _, ok := on.subdirectories[name]; !ok {
childPath := dPath.Append(name)
if err := d.Mkdir(name, 0o777); err != nil && !os.IsExist(err) {
return util.StatusWrapf(err, "Failed to create output directory %#v", childPath.GetUNIXString())
}
}
}
return nil
}
// UploadOutputs is recursively invoked by
// OutputHierarchy.UploadOutputs() to upload output directories and
// files from the locations where they are expected.
func (on *outputNode) uploadOutputs(s *uploadOutputsState, d UploadableDirectory, dPath *path.Trace) {
// Upload REv2.0 output directories that are expected to be
// present in this directory.
for _, component := range sortToUpload(on.directoriesToUpload) {
childPath := dPath.Append(component)
paths := on.directoriesToUpload[component]
if fileInfo, err := d.Lstat(component); err == nil {
switch fileType := fileInfo.Type(); fileType {
case filesystem.FileTypeDirectory:
s.uploadOutputDirectory(d, component, childPath, paths)
case filesystem.FileTypeSymlink:
s.uploadOutputSymlink(d, component, childPath, &s.actionResult.OutputDirectorySymlinks, paths)
default:
s.saveError(status.Errorf(codes.InvalidArgument, "Output directory %#v is not a directory or symlink", childPath.GetUNIXString()))
}
} else if !os.IsNotExist(err) {
s.saveError(util.StatusWrapf(err, "Failed to read attributes of output directory %#v", childPath.GetUNIXString()))
}
}
// Upload REv2.0 output files that are expected to be present in
// this directory.
for _, component := range sortToUpload(on.filesToUpload) {
childPath := dPath.Append(component)
paths := on.filesToUpload[component]
if fileInfo, err := d.Lstat(component); err == nil {
switch fileType := fileInfo.Type(); fileType {
case filesystem.FileTypeRegularFile:
s.uploadOutputFile(d, component, childPath, fileInfo.IsExecutable(), paths)
case filesystem.FileTypeSymlink:
s.uploadOutputSymlink(d, component, childPath, &s.actionResult.OutputFileSymlinks, paths)
default:
s.saveError(status.Errorf(codes.InvalidArgument, "Output file %#v is not a regular file or symlink", childPath.GetUNIXString()))
}
} else if !os.IsNotExist(err) {
s.saveError(util.StatusWrapf(err, "Failed to read attributes of output file %#v", childPath.GetUNIXString()))
}
}
// Upload REv2.1 output paths that are expected to be present in
// this directory.
for _, component := range sortToUpload(on.pathsToUpload) {
childPath := dPath.Append(component)
paths := on.pathsToUpload[component]
if fileInfo, err := d.Lstat(component); err == nil {
switch fileType := fileInfo.Type(); fileType {
case filesystem.FileTypeDirectory:
s.uploadOutputDirectory(d, component, childPath, paths)
case filesystem.FileTypeRegularFile:
s.uploadOutputFile(d, component, childPath, fileInfo.IsExecutable(), paths)
case filesystem.FileTypeSymlink:
s.uploadOutputSymlink(d, component, childPath, &s.actionResult.OutputSymlinks, paths)
default:
s.saveError(status.Errorf(codes.InvalidArgument, "Output path %#v is not a directory, regular file or symlink", childPath.GetUNIXString()))
}
} else if !os.IsNotExist(err) {
s.saveError(util.StatusWrapf(err, "Failed to read attributes of output path %#v", childPath.GetUNIXString()))
}
}
// Traverse into subdirectories.
for _, component := range on.getSubdirectoryNames() {
childPath := dPath.Append(component)
childNode := on.subdirectories[component]
if childDirectory, err := d.EnterUploadableDirectory(component); err == nil {
childNode.uploadOutputs(s, childDirectory, childPath)
childDirectory.Close()
} else if !os.IsNotExist(err) {
s.saveError(util.StatusWrapf(err, "Failed to enter output parent directory %#v", childPath.GetUNIXString()))
}
}
}
// UploadOutputsState is used by OutputHierarchy.UploadOutputs() to
// track common parameters during recursion.
type uploadOutputsState struct {
context context.Context
contentAddressableStorage blobstore.BlobAccess
digestFunction digest.Function
writableFileUploadDelay <-chan struct{}
actionResult *remoteexecution.ActionResult
uploadTreesAndDirectories bool
firstError error
}
// computeDigest computes the digest of a byte slice, using the digest
// function that's also used by the client.
func (s *uploadOutputsState) computeDigest(data []byte) digest.Digest {
digestGenerator := s.digestFunction.NewGenerator(int64(len(data)))
if _, err := digestGenerator.Write(data); err != nil {
panic(err)
}
return digestGenerator.Sum()
}
// SaveError preserves errors that occur during uploading. Even when
// errors occur, the remainder of the output files is still uploaded.
// This makes debugging easier.
func (s *uploadOutputsState) saveError(err error) {
if s.firstError == nil {
s.firstError = err
}
}
// UploadOutputDirectoryEntered is called to upload a single output
// directory as a remoteexecution.Tree. The root directory is assumed to
// already be opened.
func (s *uploadOutputsState) uploadOutputDirectoryEntered(d UploadableDirectory, dPath *path.Trace, paths []string) {
dState := uploadOutputDirectoryState{
uploadOutputsState: s,
directoriesSeen: map[digest.Digest][]byte{},
}
if rootDirectoryDigest, err := dState.uploadDirectory(d, dPath); err == nil {
// Approximate the size of the resulting Tree object, so
// that we may allocate all space at once.
directories := dState.directories
maximumTreeSizeBytes := 0
for _, directory := range directories {
maximumTreeSizeBytes += len(directory)
}
maximumTreeSizeBytes += len(directories) * (1 + protowire.SizeVarint(uint64(maximumTreeSizeBytes)))
// Construct the Tree object. We don't want to use
// proto.Marshal() for this, as it would require us to
// marshal all of the directories a second time.
treeData := make([]byte, 0, maximumTreeSizeBytes)
tag := byte(blobstore.TreeRootFieldNumber<<3) | byte(protowire.BytesType)
for i := len(directories); i > 0; i-- {
directory := directories[i-1]
treeData = append(treeData, tag)
treeData = protowire.AppendVarint(treeData, uint64(len(directory)))
treeData = append(treeData, directory...)
tag = byte(blobstore.TreeChildrenFieldNumber<<3) | byte(protowire.BytesType)
}
// Always upload the directory in Tree form, even if the
// client did not request it. CompletenessCheckingBlobAccess
// depends on it to work efficiently.
successfullyUploaded := true
treeDigest := s.computeDigest(treeData)
if err := s.contentAddressableStorage.Put(s.context, treeDigest, buffer.NewValidatedBufferFromByteSlice(treeData)); err != nil {
s.saveError(util.StatusWrapf(err, "Failed to store output directory %#v", dPath.GetUNIXString()))
successfullyUploaded = false
}
// Upload Directory messages if requested by the client.
// Only in this case may we set OutputDirectory's
// root_directory_digest.
var rootDirectoryDigestProto *remoteexecution.Digest
if s.uploadTreesAndDirectories {
rootDirectoryDigestProto = rootDirectoryDigest.GetProto()
for directoryDigest, directory := range dState.directoriesSeen {
if err := s.contentAddressableStorage.Put(s.context, directoryDigest, buffer.NewValidatedBufferFromByteSlice(directory)); err != nil {
s.saveError(util.StatusWrapf(err, "Failed to store output directory %#v", dPath.GetUNIXString()))
successfullyUploaded = false
}
}
}
if successfullyUploaded {
for _, path := range paths {
s.actionResult.OutputDirectories = append(
s.actionResult.OutputDirectories,
&remoteexecution.OutputDirectory{
Path: path,
TreeDigest: treeDigest.GetProto(),
IsTopologicallySorted: true,
RootDirectoryDigest: rootDirectoryDigestProto,
})
}
}
} else {
s.saveError(err)
}
}
// UploadOutputDirectory is called to upload a single output directory
// as a remoteexecution.Tree. The root directory is opened opened by
// this function.
func (s *uploadOutputsState) uploadOutputDirectory(d UploadableDirectory, name path.Component, childPath *path.Trace, paths []string) {
if childDirectory, err := d.EnterUploadableDirectory(name); err == nil {
s.uploadOutputDirectoryEntered(childDirectory, childPath, paths)
childDirectory.Close()
} else {
s.saveError(util.StatusWrapf(err, "Failed to enter output directory %#v", childPath.GetUNIXString()))
}
}
// UploadOutputDirectory is called to upload a single output file.
func (s *uploadOutputsState) uploadOutputFile(d UploadableDirectory, name path.Component, childPath *path.Trace, isExecutable bool, paths []string) {
if digest, err := d.UploadFile(s.context, name, s.digestFunction, s.writableFileUploadDelay); err == nil {
for _, path := range paths {
s.actionResult.OutputFiles = append(
s.actionResult.OutputFiles,
&remoteexecution.OutputFile{
Path: path,
Digest: digest.GetProto(),
IsExecutable: isExecutable,
})
}
} else {
s.saveError(util.StatusWrapf(err, "Failed to store output file %#v", childPath.GetUNIXString()))
}
}
// UploadOutputDirectory is called to read the attributes of a single
// output symlink.
func (s *uploadOutputsState) uploadOutputSymlink(d UploadableDirectory, name path.Component, childPath *path.Trace, outputSymlinks *[]*remoteexecution.OutputSymlink, paths []string) {
if targetParser, err := d.Readlink(name); err == nil {
targetPath, scopeWalker := path.EmptyBuilder.Join(path.VoidScopeWalker)
if path.Resolve(targetParser, scopeWalker); err == nil {
target := targetPath.GetUNIXString()
for _, path := range paths {
*outputSymlinks = append(
*outputSymlinks,
&remoteexecution.OutputSymlink{
Path: path,
Target: target,
})
}
} else {
s.saveError(util.StatusWrapf(err, "Failed to resolve target of output symlink %#v", childPath.GetUNIXString()))
}
} else {
s.saveError(util.StatusWrapf(err, "Failed to read output symlink %#v", childPath.GetUNIXString()))
}
}
// UploadOutputDirectoryState is used by OutputHierarchy.UploadOutputs()
// to track state specific to uploading a single output directory.
type uploadOutputDirectoryState struct {
*uploadOutputsState
directories [][]byte
directoriesSeen map[digest.Digest][]byte
}
// UploadDirectory is called to upload a single directory. Elements in
// the directory are stored in a remoteexecution.Directory, so that they
// can be placed in a remoteexecution.Tree.
func (s *uploadOutputDirectoryState) uploadDirectory(d UploadableDirectory, dPath *path.Trace) (digest.Digest, error) {
files, err := d.ReadDir()
if err != nil {
return digest.BadDigest, util.StatusWrapf(err, "Failed to read output directory %#v", dPath.GetUNIXString())
}
var directory remoteexecution.Directory
for _, file := range files {
name := file.Name()
childPath := dPath.Append(name)
switch fileType := file.Type(); fileType {
case filesystem.FileTypeRegularFile:
if childDigest, err := d.UploadFile(s.context, name, s.digestFunction, s.writableFileUploadDelay); err == nil {
directory.Files = append(directory.Files, &remoteexecution.FileNode{
Name: name.String(),
Digest: childDigest.GetProto(),
IsExecutable: file.IsExecutable(),
})
} else {
s.saveError(util.StatusWrapf(err, "Failed to store output file %#v", childPath.GetUNIXString()))
}
case filesystem.FileTypeDirectory:
if childDirectory, err := d.EnterUploadableDirectory(name); err == nil {
childDigest, err := s.uploadDirectory(childDirectory, dPath)
childDirectory.Close()
if err == nil {
directory.Directories = append(directory.Directories, &remoteexecution.DirectoryNode{
Name: name.String(),
Digest: childDigest.GetProto(),
})
} else {
s.saveError(err)
}
} else {
s.saveError(util.StatusWrapf(err, "Failed to enter output directory %#v", childPath.GetUNIXString()))
}
case filesystem.FileTypeSymlink:
if targetParser, err := d.Readlink(name); err == nil {
targetPath, scopeWalker := path.EmptyBuilder.Join(path.VoidScopeWalker)
if path.Resolve(targetParser, scopeWalker); err == nil {
directory.Symlinks = append(directory.Symlinks, &remoteexecution.SymlinkNode{
Name: name.String(),
Target: targetPath.GetUNIXString(),
})
} else {
s.saveError(util.StatusWrapf(err, "Failed to resolve target of output symlink %#v", childPath.GetUNIXString()))
}
} else {
s.saveError(util.StatusWrapf(err, "Failed to read output symlink %#v", childPath.GetUNIXString()))
}
}
}
data, err := proto.Marshal(&directory)
if err != nil {
return digest.BadDigest, util.StatusWrapf(err, "Failed to marshal output directory %#v", dPath.GetUNIXString())
}
// There is no need to make the directory part of the Tree if we
// have seen an identical directory previously.
digest := s.computeDigest(data)
if _, ok := s.directoriesSeen[digest]; !ok {
s.directories = append(s.directories, data)
s.directoriesSeen[digest] = data
}
return digest, nil
}
// outputNodePath is an implementation of path.ComponentWalker that is
// used by NewOutputHierarchy() to compute normalized paths of outputs
// of a build action.
//
// It might have been cleaner if path.Resolve() was performed directly
// against the tree of outputNode objects. Unfortunately, the Remote
// Execution protocol requires us to create the parent directories of
// outputs, while the working directory needs to be part of the input
// root explicitly. Operating directly against outputNode objects would
// make it harder to achieve that.
type outputNodePath struct {
components []path.Component
}
func (onp *outputNodePath) OnDirectory(name path.Component) (path.GotDirectoryOrSymlink, error) {
onp.components = append(onp.components, name)
return path.GotDirectory{
Child: onp,
IsReversible: true,
}, nil
}
func (onp *outputNodePath) OnTerminal(name path.Component) (*path.GotSymlink, error) {
onp.components = append(onp.components, name)
return nil, nil
}
func (onp *outputNodePath) OnUp() (path.ComponentWalker, error) {
if len(onp.components) == 0 {
return nil, status.Error(codes.InvalidArgument, "Path resolves to a location outside the input root directory")
}
onp.components = onp.components[:len(onp.components)-1]
return onp, nil
}
// OutputHierarchy is used by LocalBuildExecutor to track output
// directories and files that are expected to be generated by the build
// action. OutputHierarchy can be used to create parent directories of
// outputs prior to execution, and to upload outputs into the CAS after
// execution.
type OutputHierarchy struct {
root outputNode
rootsToUpload []string
uploadTreesAndDirectories bool
}
// NewOutputHierarchy creates a new OutputHierarchy that uses the
// working directory and the output paths specified in an REv2 Command
// message.
func NewOutputHierarchy(command *remoteexecution.Command) (*OutputHierarchy, error) {
var workingDirectory outputNodePath
if err := path.Resolve(path.UNIXFormat.NewParser(command.WorkingDirectory), path.NewRelativeScopeWalker(&workingDirectory)); err != nil {
return nil, util.StatusWrap(err, "Invalid working directory")
}
oh := &OutputHierarchy{
root: *newOutputDirectory(),
uploadTreesAndDirectories: command.OutputDirectoryFormat == remoteexecution.Command_DIRECTORY_ONLY ||
command.OutputDirectoryFormat == remoteexecution.Command_TREE_AND_DIRECTORY,
}
if len(command.OutputPaths) == 0 {
// Register REv2.0 output directories.
for _, outputDirectory := range command.OutputDirectories {
if on, name, err := oh.lookup(workingDirectory, outputDirectory); err != nil {
return nil, util.StatusWrapf(err, "Invalid output directory %#v", outputDirectory)
} else if on == nil {
oh.rootsToUpload = append(oh.rootsToUpload, outputDirectory)
} else {
on.directoriesToUpload[*name] = append(on.directoriesToUpload[*name], outputDirectory)
}
}
// Register REv2.0 output files.
for _, outputFile := range command.OutputFiles {
if on, name, err := oh.lookup(workingDirectory, outputFile); err != nil {
return nil, util.StatusWrapf(err, "Invalid output file %#v", outputFile)
} else if on == nil {
return nil, status.Errorf(codes.InvalidArgument, "Output file %#v resolves to the input root directory", outputFile)
} else {
on.filesToUpload[*name] = append(on.filesToUpload[*name], outputFile)
}
}
} else {
// Register REv2.1 output paths.
for _, outputPath := range command.OutputPaths {
if on, name, err := oh.lookup(workingDirectory, outputPath); err != nil {
return nil, util.StatusWrapf(err, "Invalid output path %#v", outputPath)
} else if on == nil {
oh.rootsToUpload = append(oh.rootsToUpload, outputPath)
} else {
on.pathsToUpload[*name] = append(on.pathsToUpload[*name], outputPath)
}
}
}
return oh, nil
}
func (oh *OutputHierarchy) lookup(workingDirectory outputNodePath, targetPath string) (*outputNode, *path.Component, error) {
// Resolve the path of the output relative to the working directory.
outputPath := outputNodePath{
components: append([]path.Component(nil), workingDirectory.components...),
}
if err := path.Resolve(path.UNIXFormat.NewParser(targetPath), path.NewRelativeScopeWalker(&outputPath)); err != nil {
return nil, nil, err
}
components := outputPath.components
if len(components) == 0 {
// Path resolves to the root directory.
return nil, nil, nil
}
// Path resolves to a location inside the root directory,
// meaning it is named. Create all parent directories.
on := &oh.root
for _, component := range components[:len(components)-1] {
child, ok := on.subdirectories[component]
if !ok {
child = newOutputDirectory()
on.subdirectories[component] = child
}
on = child
}
return on, &components[len(components)-1], nil
}
// ParentPopulatableDirectory contains a subset of the methods of
// filesystem.Directory that are required for creating the parent
// directories of output files of a build action.
type ParentPopulatableDirectory interface {
Close() error
EnterParentPopulatableDirectory(name path.Component) (ParentPopulatableDirectory, error)
Mkdir(name path.Component, perm os.FileMode) error
}
// CreateParentDirectories creates parent directories of outputs. This
// function is called prior to executing the build action.
func (oh *OutputHierarchy) CreateParentDirectories(d ParentPopulatableDirectory) error {
return oh.root.createParentDirectories(d, nil)
}
// UploadOutputs uploads outputs of the build action into the CAS. This
// function is called after executing the build action.
func (oh *OutputHierarchy) UploadOutputs(ctx context.Context, d UploadableDirectory, contentAddressableStorage blobstore.BlobAccess, digestFunction digest.Function, writableFileUploadDelay <-chan struct{}, actionResult *remoteexecution.ActionResult, forceUploadTreesAndDirectories bool) error {
s := uploadOutputsState{
context: ctx,
contentAddressableStorage: contentAddressableStorage,
digestFunction: digestFunction,
writableFileUploadDelay: writableFileUploadDelay,
actionResult: actionResult,
uploadTreesAndDirectories: oh.uploadTreesAndDirectories || forceUploadTreesAndDirectories,
}
if len(oh.rootsToUpload) > 0 {
s.uploadOutputDirectoryEntered(d, nil, oh.rootsToUpload)
}
oh.root.uploadOutputs(&s, d, nil)
return s.firstError
}