Golang BuildTarget.GetCommand方法代码示例

//.........这里部分代码省略.........
				state.LogBuildResult(tid, target.Label, core.TargetCached, "Cached (unchanged)")
			}
			return true // got from cache
		}
		return false
	}

	cacheKey := mustShortTargetHash(state, target)
	if state.Cache != nil {
		// Note that ordering here is quite sensitive since the post-build function can modify
		// what we would retrieve from the cache.
		if target.PostBuildFunction != 0 {
			log.Debug("Checking for post-build output file for %s in cache...", target.Label)
			if (*state.Cache).RetrieveExtra(target, cacheKey, core.PostBuildOutputFileName(target)) {
				postBuildOutput = runPostBuildFunctionIfNeeded(tid, state, target)
				if retrieveArtifacts() {
					return nil
				}
			}
		} else if retrieveArtifacts() {
			return nil
		}
	}
	if err := prepareSources(state.Graph, target); err != nil {
		return fmt.Errorf("Error preparing sources for %s: %s", target.Label, err)
	}

	state.LogBuildResult(tid, target.Label, core.TargetBuilding, target.BuildingDescription)
	replacedCmd := replaceSequences(target)
	env := core.StampedBuildEnvironment(state, target, false, cacheKey)
	log.Debug("Building target %s\nENVIRONMENT:\n%s\n%s", target.Label, strings.Join(env, "\n"), replacedCmd)
	out, combined, err := core.ExecWithTimeoutShell(target.TmpDir(), env, target.BuildTimeout, state.Config.Build.Timeout, state.ShowAllOutput, replacedCmd)
	if err != nil {
		if state.Verbosity >= 4 {
			return fmt.Errorf("Error building target %s: %s\nENVIRONMENT:\n%s\n%s\n%s",
				target.Label, err, strings.Join(env, "\n"), target.GetCommand(), combined)
		}
		return fmt.Errorf("Error building target %s: %s\n%s", target.Label, err, combined)
	}
	if target.PostBuildFunction != 0 {
		out = bytes.TrimSpace(out)
		sout := string(out)
		if postBuildOutput != "" {
			// We've already run the post-build function once, it's not safe to do it again (e.g. if adding new
			// targets, it will likely fail). Theoretically it should get the same output this time and hence would
			// do the same thing, since it had all the same inputs.
			// Obviously we can't be 100% sure that will be the case, so issue a warning if not...
			if postBuildOutput != sout {
				log.Warning("The build output for %s differs from what we got back from the cache earlier.\n"+
					"This implies your target's output is nondeterministic; Please won't re-run the\n"+
					"post-build function, which will *probably* be okay, but Please can't be sure.\n"+
					"See https://github.com/thought-machine/please/issues/113 for more information.", target.Label)
				log.Debug("Cached build output for %s: %s\n\nNew build output: %s",
					target.Label, postBuildOutput, sout)
			}
		} else if err := parse.RunPostBuildFunction(tid, state, target, sout); err != nil {
			return err
		}
		storePostBuildOutput(state, target, out)
	}
	checkLicences(state, target)
	state.LogBuildResult(tid, target.Label, core.TargetBuilding, "Collecting outputs...")
	extraOuts, outputsChanged, err := moveOutputs(state, target)
	if err != nil {
		return fmt.Errorf("Error moving outputs for target %s: %s", target.Label, err)
	}
	if _, err = calculateAndCheckRuleHash(state, target); err != nil {
		return err
	}
	if outputsChanged {
		target.SetState(core.Built)
	} else {
		target.SetState(core.Unchanged)
	}
	if state.Cache != nil {
		state.LogBuildResult(tid, target.Label, core.TargetBuilding, "Storing...")
		newCacheKey := mustShortTargetHash(state, target)
		(*state.Cache).Store(target, newCacheKey)
		if target.PostBuildFunction != 0 {
			// NB. Important this is stored with the earlier hash - if we calculate the hash
			//     now, it might be different, and we could of course never retrieve it again.
			(*state.Cache).StoreExtra(target, cacheKey, core.PostBuildOutputFileName(target))
		}
		for _, out := range extraOuts {
			(*state.Cache).StoreExtra(target, newCacheKey, out)
		}
	}
	// Clean up the temporary directory once it's done.
	if state.CleanWorkdirs {
		if err := os.RemoveAll(target.TmpDir()); err != nil {
			log.Warning("Failed to remove temporary directory for %s: %s", target.Label, err)
		}
	}
	if outputsChanged {
		state.LogBuildResult(tid, target.Label, core.TargetBuilt, "Built")
	} else {
		state.LogBuildResult(tid, target.Label, core.TargetBuilt, "Built (unchanged)")
	}
	return nil
}

// Replace escape sequences in the target's command.
// For example, $(location :blah) -> the output of rule blah.
func replaceSequences(target *core.BuildTarget) string {
	return ReplaceSequences(target, target.GetCommand())
}

func ruleHash(target *core.BuildTarget, runtime bool) []byte {
	h := sha1.New()
	h.Write([]byte(target.Label.String()))
	for _, dep := range target.DeclaredDependencies() {
		h.Write([]byte(dep.String()))
	}
	for _, vis := range target.Visibility {
		h.Write([]byte(vis.String())) // Doesn't strictly affect the output, but best to be safe.
	}
	for _, hsh := range target.Hashes {
		h.Write([]byte(hsh))
	}
	for _, source := range target.AllSources() {
		h.Write([]byte(source.String()))
	}
	for _, out := range target.DeclaredOutputs() {
		h.Write([]byte(out))
	}
	for _, licence := range target.Licences {
		h.Write([]byte(licence))
	}
	for _, output := range target.TestOutputs {
		h.Write([]byte(output))
	}
	for _, output := range target.OptionalOutputs {
		h.Write([]byte(output))
	}
	for _, label := range target.Labels {
		h.Write([]byte(label))
	}
	hashBool(h, target.IsBinary)
	hashBool(h, target.IsTest)

	// Note that we only hash the current command here; whatever's set in commands that we're not going
	// to run is uninteresting to us.
	h.Write([]byte(target.GetCommand()))

	if runtime {
		// Similarly, we only hash the current command here again.
		h.Write([]byte(target.GetTestCommand()))
		for _, datum := range target.Data {
			h.Write([]byte(datum.String()))
		}
		hashBool(h, target.Containerise)
		if target.ContainerSettings != nil {
			e := gob.NewEncoder(h)
			if err := e.Encode(target.ContainerSettings); err != nil {
				panic(err)
			}
		}
		if target.Containerise {
			h.Write(core.State.Hashes.Containerisation)
		}
	}

	hashBool(h, target.NeedsTransitiveDependencies)
	hashBool(h, target.OutputIsComplete)
	// Should really not be conditional here, but we don't want adding the new flag to
	// change the hash of every single other target everywhere.
	// Might consider removing this the next time we peturb the hashing strategy.
	if target.Stamp {
		hashBool(h, target.Stamp)
	}
	for _, require := range target.Requires {
		h.Write([]byte(require))
	}
	// Indeterminate iteration order, yay...
	languages := []string{}
	for k := range target.Provides {
		languages = append(languages, k)
	}
	sort.Strings(languages)
	for _, lang := range languages {
		h.Write([]byte(lang))
		h.Write([]byte(target.Provides[lang].String()))
	}
	// Obviously we don't include the code pointer because it's a pointer.
	h.Write(target.PreBuildHash)
	h.Write(target.PostBuildHash)
	return h.Sum(nil)
}