2 goredo -- djb's redo implementation on pure Go
3 Copyright (C) 2020-2021 Sergey Matveev <stargrave@stargrave.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 3 of the License.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
31 "go.cypherpunks.ru/recfile"
32 "lukechampine.com/blake3"
37 func recfileWrite(fdDep *os.File, fields ...recfile.Field) error {
38 w := recfile.NewWriter(fdDep)
39 if _, err := w.RecordStart(); err != nil {
42 if _, err := w.WriteFields(fields...); err != nil {
48 func ifcreate(fdDep *os.File, tgt string) error {
49 trace(CDebug, "ifcreate: %s <- %s", fdDep.Name(), tgt)
52 recfile.Field{Name: "Type", Value: DepTypeIfcreate},
53 recfile.Field{Name: "Target", Value: tgt},
57 func always(fdDep *os.File) error {
58 trace(CDebug, "always: %s", fdDep.Name())
59 return recfileWrite(fdDep, recfile.Field{Name: "Type", Value: DepTypeAlways})
62 func stamp(fdDep, src *os.File) error {
64 hsh, err := fileHash(os.Stdin)
68 trace(CDebug, "stamp: %s <- %s", fdDep.Name(), hsh)
71 recfile.Field{Name: "Type", Value: DepTypeStamp},
72 recfile.Field{Name: "Hash", Value: hsh},
76 func fileHash(fd *os.File) (string, error) {
77 h := blake3.New(32, nil)
78 if _, err := io.Copy(h, bufio.NewReader(fd)); err != nil {
81 return hex.EncodeToString(h.Sum(nil)), nil
84 func writeDep(fdDep *os.File, cwd, tgt string) error {
85 trace(CDebug, "ifchange: %s <- %s", fdDep.Name(), tgt)
86 fd, err := os.Open(path.Join(cwd, tgt))
98 inode, err := inodeFromFile(fd)
102 hsh, err := fileHash(fd)
106 fields := []recfile.Field{
107 {Name: "Type", Value: DepTypeIfchange},
108 {Name: "Target", Value: tgt},
109 {Name: "Hash", Value: hsh},
111 fields = append(fields, inode.RecfileFields()...)
112 return recfileWrite(fdDep, fields...)
115 func writeDeps(fdDep *os.File, tgts []string) (err error) {
117 trace(CDebug, "no opened fdDep: %s", tgts)
120 for _, tgt := range tgts {
121 tgtAbs, err := filepath.Abs(tgt)
125 tgtDir := path.Join(Cwd, DirPrefix)
126 tgtRel, err := filepath.Rel(tgtDir, tgtAbs)
130 if _, errStat := os.Stat(tgt); errStat == nil {
131 err = writeDep(fdDep, tgtDir, tgtRel)
133 trace(CDebug, "ifchange: %s <- %s (unexisting)", fdDep.Name(), tgtRel)
134 fields := []recfile.Field{
135 {Name: "Type", Value: DepTypeIfchange},
136 {Name: "Target", Value: tgtRel},
138 inodeDummy := Inode{}
139 fields = append(fields, inodeDummy.RecfileFields()...)
140 err = recfileWrite(fdDep, fields...)
146 type DepInfo struct {
151 ifchanges []map[string]string
154 func depRead(fdDep *os.File) (*DepInfo, error) {
155 r := recfile.NewReader(fdDep)
156 m, err := r.NextMap()
161 if b := m["Build"]; b == "" {
162 return nil, errors.New(".rec missing Build:")
167 m, err := r.NextMap()
176 depInfo.always = true
177 case DepTypeIfcreate:
180 return nil, errors.New("invalid format of .rec")
182 depInfo.ifcreates = append(depInfo.ifcreates, dep)
183 case DepTypeIfchange:
185 depInfo.ifchanges = append(depInfo.ifchanges, m)
189 return nil, errors.New("invalid format of .rec")
193 return nil, errors.New("invalid format of .rec")