/*
goredo -- redo implementation on pure Go
-Copyright (C) 2020 Sergey Matveev <stargrave@stargrave.org>
+Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
import (
"bufio"
"encoding/hex"
+ "errors"
"fmt"
"io"
"os"
"path"
- "strings"
- "syscall"
+ "path/filepath"
"go.cypherpunks.ru/recfile"
- "golang.org/x/crypto/blake2b"
+ "golang.org/x/sys/unix"
+ "lukechampine.com/blake3"
)
+var DirPrefix string
+
func recfileWrite(fdDep *os.File, fields ...recfile.Field) error {
w := recfile.NewWriter(fdDep)
if _, err := w.RecordStart(); err != nil {
trace(CDebug, "ifcreate: %s <- %s", fdDep.Name(), tgt)
return recfileWrite(
fdDep,
- recfile.Field{Name: "Type", Value: "ifcreate"},
+ recfile.Field{Name: "Type", Value: DepTypeIfcreate},
recfile.Field{Name: "Target", Value: tgt},
)
}
func always(fdDep *os.File) error {
trace(CDebug, "always: %s", fdDep.Name())
- return recfileWrite(fdDep, recfile.Field{Name: "Type", Value: "always"})
+ return recfileWrite(fdDep, recfile.Field{Name: "Type", Value: DepTypeAlways})
}
func stamp(fdDep, src *os.File) error {
trace(CDebug, "stamp: %s <- %s", fdDep.Name(), hsh)
return recfileWrite(
fdDep,
- recfile.Field{Name: "Type", Value: "stamp"},
+ recfile.Field{Name: "Type", Value: DepTypeStamp},
recfile.Field{Name: "Hash", Value: hsh},
)
}
func fileCtime(fd *os.File) (string, error) {
- fi, err := fd.Stat()
- if err != nil {
+ var stat unix.Stat_t
+ if err := unix.Fstat(int(fd.Fd()), &stat); err != nil {
return "", err
}
- stat := fi.Sys().(*syscall.Stat_t)
- sec, nsec := stat.Ctimespec.Unix()
+ sec, nsec := stat.Ctim.Unix()
return fmt.Sprintf("%d.%d", sec, nsec), nil
}
func fileHash(fd *os.File) (string, error) {
- h, err := blake2b.New256(nil)
- if err != nil {
- panic(err)
- }
- if _, err = io.Copy(h, bufio.NewReader(fd)); err != nil {
+ h := blake3.New(32, nil)
+ if _, err := io.Copy(h, bufio.NewReader(fd)); err != nil {
return "", err
}
return hex.EncodeToString(h.Sum(nil)), nil
return err
}
defer fd.Close()
+ fi, err := fd.Stat()
+ if err != nil {
+ return err
+ }
+ if fi.IsDir() {
+ return nil
+ }
ts, err := fileCtime(fd)
if err != nil {
return err
}
- fields := []recfile.Field{
- recfile.Field{Name: "Type", Value: "ifchange"},
+ hsh, err := fileHash(fd)
+ if err != nil {
+ return err
+ }
+ return recfileWrite(
+ fdDep,
+ recfile.Field{Name: "Type", Value: DepTypeIfchange},
recfile.Field{Name: "Target", Value: tgt},
recfile.Field{Name: "Ctime", Value: ts},
+ recfile.Field{Name: "Hash", Value: hsh},
+ )
+}
+
+func writeDeps(fdDep *os.File, tgts []string) (err error) {
+ if fdDep == nil {
+ trace(CDebug, "no opened fdDep: %s", tgts)
+ return nil
}
- var hsh string
- if !NoHash {
- hsh, err = fileHash(fd)
+ for _, tgt := range tgts {
+ tgtAbs, err := filepath.Abs(tgt)
if err != nil {
- return err
+ panic(err)
+ }
+ tgtDir := path.Join(Cwd, DirPrefix)
+ tgtRel, err := filepath.Rel(tgtDir, tgtAbs)
+ if err != nil {
+ panic(err)
+ }
+ if _, errStat := os.Stat(tgt); errStat == nil {
+ err = writeDep(fdDep, tgtDir, tgtRel)
+ } else {
+ trace(CDebug, "ifchange: %s <- %s (unexisting)", fdDep.Name(), tgtRel)
+ err = recfileWrite(
+ fdDep,
+ recfile.Field{Name: "Type", Value: DepTypeIfchange},
+ recfile.Field{Name: "Target", Value: tgtRel},
+ recfile.Field{Name: "Ctime", Value: "0.0"},
+ )
}
- fields = append(fields, recfile.Field{Name: "Hash", Value: hsh})
}
- err = recfileWrite(fdDep, fields...)
- return err
+ return
}
-func writeDeps(fdDep *os.File, tgts []string) error {
- if fdDep == nil {
- trace(CDebug, "no opened fdDep: %s", tgts)
- return nil
+type DepInfo struct {
+ build string
+ always bool
+ stamp string
+ ifcreates []string
+ ifchanges []map[string]string
+}
+
+func depRead(fdDep *os.File) (*DepInfo, error) {
+ r := recfile.NewReader(fdDep)
+ m, err := r.NextMap()
+ if err != nil {
+ return nil, err
}
- ups := []string{}
- upLevels := strings.Count(os.Getenv(RedoDirPrefixEnv), "/")
- for i := 0; i < upLevels; i++ {
- ups = append(ups, "..")
+ depInfo := DepInfo{}
+ if b := m["Build"]; b == "" {
+ return nil, errors.New(".dep missing Build:")
+ } else {
+ depInfo.build = b
}
- up := path.Join(ups...)
- for _, tgt := range tgts {
- if _, err := os.Stat(tgt); err == nil {
- if err = writeDep(fdDep, Cwd, path.Join(up, tgt)); err != nil {
- return err
+ for {
+ m, err := r.NextMap()
+ if err != nil {
+ if err == io.EOF {
+ break
}
+ return nil, err
+ }
+ switch m["Type"] {
+ case DepTypeAlways:
+ depInfo.always = true
+ case DepTypeIfcreate:
+ dep := m["Target"]
+ if dep == "" {
+ return nil, errors.New("invalid format of .dep")
+ }
+ depInfo.ifcreates = append(depInfo.ifcreates, dep)
+ case DepTypeIfchange:
+ delete(m, "Type")
+ depInfo.ifchanges = append(depInfo.ifchanges, m)
+ case DepTypeStamp:
+ hsh := m["Hash"]
+ if hsh == "" {
+ return nil, errors.New("invalid format of .dep")
+ }
+ depInfo.stamp = hsh
+ default:
+ return nil, errors.New("invalid format of .dep")
}
}
- return nil
+ return &depInfo, nil
}