2 goredo -- djb's redo implementation on pure Go
3 Copyright (C) 2020-2023 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/>.
30 "go.cypherpunks.ru/recfile"
31 "lukechampine.com/blake3"
38 ErrBadRecFormat = errors.New("invalid format of .rec")
41 func recfileWrite(fdDep io.StringWriter, fields ...recfile.Field) error {
42 w := recfile.NewWriter(fdDep)
43 if _, err := w.RecordStart(); err != nil {
46 if _, err := w.WriteFields(fields...); err != nil {
52 func ifcreate(fdDep *os.File, tgt string) error {
53 tracef(CDebug, "ifcreate: %s <- %s", fdDep.Name(), tgt)
56 recfile.Field{Name: "Type", Value: DepTypeIfcreate},
57 recfile.Field{Name: "Target", Value: tgt},
61 func always(fdDep *os.File) error {
62 tracef(CDebug, "always: %s", fdDep.Name())
63 return recfileWrite(fdDep, recfile.Field{Name: "Type", Value: DepTypeAlways})
66 func stamp(fdDep, src *os.File) error {
68 hsh, err := fileHash(src)
72 tracef(CDebug, "stamp: %s <- %s", fdDep.Name(), hsh)
75 recfile.Field{Name: "Type", Value: DepTypeStamp},
76 recfile.Field{Name: "Hash", Value: hsh},
80 func fileHash(fd *os.File) (string, error) {
81 h := blake3.New(32, nil)
82 if _, err := io.Copy(h, bufio.NewReader(fd)); err != nil {
85 return hex.EncodeToString(h.Sum(nil)), nil
88 func depWrite(fdDep *os.File, cwd, tgt, hsh string) error {
89 tracef(CDebug, "ifchange: %s <- %s", fdDep.Name(), tgt)
90 fd, err := os.Open(path.Join(cwd, tgt))
102 inode, err := inodeFromFileByFd(fd)
107 hsh, err = fileHash(fd)
112 fields := []recfile.Field{
113 {Name: "Type", Value: DepTypeIfchange},
114 {Name: "Target", Value: tgt},
115 {Name: "Hash", Value: hsh},
117 fields = append(fields, inode.RecfileFields()...)
118 return recfileWrite(fdDep, fields...)
121 func depsWrite(fdDep *os.File, tgts []string) error {
123 tracef(CDebug, "no opened fdDep: %s", tgts)
127 for _, tgt := range tgts {
128 tgtAbs := mustAbs(tgt)
130 if DepCwd != "" && Cwd != DepCwd {
133 tgtDir := path.Join(cwd, DirPrefix)
134 tgtRel := mustRel(tgtDir, tgtAbs)
135 if _, errStat := os.Stat(tgt); errStat == nil {
136 err = ErrLine(depWrite(fdDep, tgtDir, tgtRel, ""))
138 tracef(CDebug, "ifchange: %s <- %s (non-existing)", fdDep.Name(), tgtRel)
139 fields := []recfile.Field{
140 {Name: "Type", Value: DepTypeIfchange},
141 {Name: "Target", Value: tgtRel},
143 inodeDummy := Inode{}
144 fields = append(fields, inodeDummy.RecfileFields()...)
145 err = ErrLine(recfileWrite(fdDep, fields...))
154 type DepInfo struct {
159 ifchanges []map[string]string
162 func depRead(fdDep io.Reader) (*DepInfo, error) {
163 r := recfile.NewReader(fdDep)
164 m, err := r.NextMap()
171 return nil, errors.New(".rec missing Build:")
175 m, err := r.NextMap()
177 if errors.Is(err, io.EOF) {
184 depInfo.always = true
185 case DepTypeIfcreate:
188 return nil, ErrBadRecFormat
190 depInfo.ifcreates = append(depInfo.ifcreates, dep)
191 case DepTypeIfchange:
193 depInfo.ifchanges = append(depInfo.ifchanges, m)
197 return nil, ErrBadRecFormat
201 return nil, ErrBadRecFormat