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, " ")
}
// buildFilegroup runs the manual build steps for a filegroup rule.
// We don't force this to be done in bash to avoid errors with maximum command lengths,
// and it's actually quite fiddly to get just so there.
func buildFilegroup(tid int, state *core.BuildState, target *core.BuildTarget) error {
if err := prepareDirectory(target.OutDir(), false); err != nil {
return err
}
if err := os.RemoveAll(ruleHashFileName(target)); err != nil {
return err
}
changed := false
outDir := target.OutDir()
for _, source := range target.Sources {
fullPaths := source.FullPaths(state.Graph)
for i, sourcePath := range source.LocalPaths(state.Graph) {
outPath := path.Join(outDir, sourcePath)
c, err := moveOutput(target, fullPaths[i], outPath, true)
if err != nil {
return err
}
changed = changed || c
}
}
if target.HasLabel("py") && !target.IsBinary {
// Pre-emptively create __init__.py files so the outputs can be loaded dynamically.
// It's a bit cheeky to do non-essential language-specific logic but this enables
// a lot of relatively normal Python workflows.
// Errors are deliberately ignored.
createInitPy(outDir)
}
if _, err := calculateAndCheckRuleHash(state, target); err != nil {
return err
} else if changed {
target.SetState(core.Built)
} else {
target.SetState(core.Unchanged)
}
state.LogBuildResult(tid, target.Label, core.TargetBuilt, "Built")
return nil
}