func (cache *rpcCache) retrieveArtifacts(target *core.BuildTarget, req *pb.RetrieveRequest, remove bool) bool {
ctx, cancel := context.WithTimeout(context.Background(), cache.timeout)
defer cancel()
response, err := cache.client.Retrieve(ctx, req)
if err != nil {
log.Warning("Failed to retrieve artifacts for %s", target.Label)
cache.error()
return false
} else if !response.Success {
// Quiet, this is almost certainly just a 'not found'
log.Debug("Couldn't retrieve artifacts for %s [key %s] from RPC cache", target.Label, base64.RawURLEncoding.EncodeToString(req.Hash))
return false
}
// Remove any existing outputs first; this is important for cases where the output is a
// directory, because we get back individual artifacts, and we need to make sure that
// only the retrieved artifacts are present in the output.
if remove {
for _, out := range target.Outputs() {
out := path.Join(target.OutDir(), out)
if err := os.RemoveAll(out); err != nil {
log.Error("Failed to remove artifact %s: %s", out, err)
return false
}
}
}
for _, artifact := range response.Artifacts {
if !cache.writeFile(target, artifact.File, artifact.Body) {
return false
}
}
// Sanity check: if we don't get anything back, assume it probably wasn't really a success.
return len(response.Artifacts) > 0
}
func makeJSONTarget(graph *core.BuildGraph, target *core.BuildTarget) JSONTarget {
t := JSONTarget{}
for in := range core.IterSources(graph, target) {
t.Inputs = append(t.Inputs, in.Src)
}
for _, out := range target.Outputs() {
t.Outputs = append(t.Outputs, path.Join(target.Label.PackageName, out))
}
for _, src := range target.AllSourcePaths(graph) {
t.Sources = append(t.Sources, src)
}
for _, dep := range target.Dependencies() {
t.Deps = append(t.Deps, dep.Label.String())
}
for data := range core.IterRuntimeFiles(graph, target, false) {
t.Data = append(t.Data, data.Src)
}
t.Labels = target.Labels
t.Requires = target.Requires
rawHash := append(build.RuleHash(target, true, false), core.State.Hashes.Config...)
t.Hash = base64.RawStdEncoding.EncodeToString(rawHash)
t.Test = target.IsTest
t.Binary = target.IsBinary
t.TestOnly = target.TestOnly
return t
}
// Yields all cacheable artifacts from this target. Useful for cache implementations
// to not have to reinvent logic around post-build functions etc.
func cacheArtifacts(target *core.BuildTarget) <-chan string {
ch := make(chan string, 10)
go func() {
for _, out := range target.Outputs() {
ch <- out
}
close(ch)
}()
return ch
}
// RemoveOutputs removes all generated outputs for a rule.
func RemoveOutputs(target *core.BuildTarget) error {
if err := os.Remove(ruleHashFileName(target)); err != nil && !os.IsNotExist(err) {
return err
}
for _, output := range target.Outputs() {
if err := os.RemoveAll(path.Join(target.OutDir(), output)); err != nil {
return err
}
}
return nil
}
func buildResult(target *core.BuildTarget) []string {
results := []string{}
if target != nil {
for _, out := range target.Outputs() {
if core.StartedAtRepoRoot() {
results = append(results, path.Join(target.OutDir(), out))
} else {
results = append(results, path.Join(core.RepoRoot, target.OutDir(), out))
}
}
}
return results
}
// OutputHash calculates the hash of a target's outputs.
func OutputHash(target *core.BuildTarget) ([]byte, error) {
h := sha1.New()
for _, output := range target.Outputs() {
// NB. Always force a recalculation of the output hashes here. Memoisation is not
// useful because by definition we are rebuilding a target, and can actively hurt
// in cases where we compare the retrieved cache artifacts with what was there before.
h2, err := pathHash(path.Join(target.OutDir(), output), true)
if err != nil {
return nil, err
}
h.Write(h2)
}
return h.Sum(nil), nil
}
func moveOutputs(state *core.BuildState, target *core.BuildTarget) ([]string, bool, error) {
// Before we write any outputs, we must remove the old hash file to avoid it being
// left in an inconsistent state.
if err := os.RemoveAll(ruleHashFileName(target)); err != nil {
return nil, true, err
}
changed := false
tmpDir := target.TmpDir()
outDir := target.OutDir()
for _, output := range target.Outputs() {
tmpOutput := path.Join(tmpDir, output)
realOutput := path.Join(outDir, output)
if !core.PathExists(tmpOutput) {
return nil, true, fmt.Errorf("Rule %s failed to create output %s", target.Label, tmpOutput)
}
// If output is a symlink, dereference it. Otherwise, for efficiency,
// we can just move it without a full copy (saves copying large .jar files etc).
dereferencedPath, err := filepath.EvalSymlinks(tmpOutput)
if err != nil {
return nil, true, err
}
// NB. false -> not filegroup, we wouldn't be here if it was.
outputChanged, err := moveOutput(target, dereferencedPath, realOutput, false)
if err != nil {
return nil, true, err
}
changed = changed || outputChanged
}
if changed {
log.Debug("Outputs for %s have changed", target.Label)
} else {
log.Debug("Outputs for %s are unchanged", target.Label)
}
// Optional outputs get moved but don't contribute to the hash or for incrementality.
// Glob patterns are supported on these.
extraOuts := []string{}
for _, output := range core.Glob(tmpDir, target.OptionalOutputs, nil, nil, true) {
log.Debug("Discovered optional output %s", output)
tmpOutput := path.Join(tmpDir, output)
realOutput := path.Join(outDir, output)
if _, err := moveOutput(target, tmpOutput, realOutput, false); err != nil {
return nil, changed, err
}
extraOuts = append(extraOuts, output)
}
return extraOuts, changed, nil
}
// Return true if the rule needs building, false if the existing outputs are OK.
func needsBuilding(state *core.BuildState, target *core.BuildTarget, postBuild bool) bool {
// Check the dependencies first, because they don't need any disk I/O.
if target.NeedsTransitiveDependencies {
if anyDependencyHasChanged(target) {
return true // one of the transitive deps has changed, need to rebuild
}
} else {
for _, dep := range target.Dependencies() {
if dep.State() < core.Unchanged {
log.Debug("Need to rebuild %s, %s has changed", target.Label, dep.Label)
return true // dependency has just been rebuilt, do this too.
}
}
}
oldRuleHash, oldConfigHash, oldSourceHash := readRuleHashFile(ruleHashFileName(target), postBuild)
if !bytes.Equal(oldConfigHash, state.Hashes.Config) {
if len(oldConfigHash) == 0 {
// Small nicety to make it a bit clearer what's going on.
log.Debug("Need to build %s, outputs aren't there", target.Label)
} else {
log.Debug("Need to rebuild %s, config has changed (was %s, need %s)", target.Label, b64(oldConfigHash), b64(state.Hashes.Config))
}
return true
}
newRuleHash := RuleHash(target, false, postBuild)
if !bytes.Equal(oldRuleHash, newRuleHash) {
log.Debug("Need to rebuild %s, rule has changed (was %s, need %s)", target.Label, b64(oldRuleHash), b64(newRuleHash))
return true
}
newSourceHash, err := sourceHash(state.Graph, target)
if err != nil || !bytes.Equal(oldSourceHash, newSourceHash) {
log.Debug("Need to rebuild %s, sources have changed (was %s, need %s)", target.Label, b64(oldSourceHash), b64(newSourceHash))
return true
}
// Check the outputs of this rule exist. This would only happen if the user had
// removed them but it's incredibly aggravating if you remove an output and the
// rule won't rebuild itself.
for _, output := range target.Outputs() {
realOutput := path.Join(target.OutDir(), output)
if !core.PathExists(realOutput) {
log.Debug("Output %s doesn't exist for rule %s; will rebuild.", realOutput, target.Label)
return true
}
}
// Maybe we've forced a rebuild. Do this last; might be interesting to see if it needed building anyway.
return state.ForceRebuild && (state.IsOriginalTarget(target.Label) || state.IsOriginalTarget(target.Label.Parent()))
}
// Prepares the output directories for a target
func prepareDirectories(target *core.BuildTarget) error {
if err := prepareDirectory(target.TmpDir(), true); err != nil {
return err
}
if err := prepareDirectory(target.OutDir(), false); err != nil {
return err
}
// Nicety for the build rules: create any directories that it's
// declared it'll create files in.
for _, out := range target.Outputs() {
if dir := path.Dir(out); dir != "." {
outPath := path.Join(target.TmpDir(), dir)
if !core.PathExists(outPath) {
if err := os.MkdirAll(outPath, core.DirPermissions); err != nil {
return err
}
}
}
}
return nil
}
func checkAndReplaceSequence(target, dep *core.BuildTarget, in string, runnable, multiple, dir, outPrefix, hash, test, allOutputs, tool bool) string {
if allOutputs && !multiple && len(dep.Outputs()) != 1 {
// Label must have only one output.
panic(fmt.Sprintf("Rule %s can't use %s; %s has multiple outputs.", target.Label, in, dep.Label))
} else if runnable && !dep.IsBinary {
panic(fmt.Sprintf("Rule %s can't $(exe %s), it's not executable", target.Label, dep.Label))
} else if runnable && len(dep.Outputs()) == 0 {
panic(fmt.Sprintf("Rule %s is tagged as binary but produces no output.", dep.Label))
}
if hash {
return base64.RawURLEncoding.EncodeToString(mustShortTargetHash(core.State, dep))
}
output := ""
for _, out := range dep.Outputs() {
if allOutputs || out == in {
if tool {
abs, err := filepath.Abs(handleDir(dep.OutDir(), out, dir))
if err != nil {
log.Fatalf("Couldn't calculate relative path: %s", err)
}
output += quote(abs) + " "
} else {
output += quote(fileDestination(target, dep, out, dir, outPrefix, test)) + " "
}
if dir {
break
}
}
}
if runnable && dep.HasLabel("java_non_exe") {
// The target is a Java target that isn't self-executable, hence it needs something to run it.
output = "java -jar " + output
}
return strings.TrimRight(output, " ")
}