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)
}