2 goredo -- redo implementation on pure Go
3 Copyright (C) 2020 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/>.
32 "go.cypherpunks.ru/recfile"
33 "golang.org/x/crypto/blake2b"
36 func recfileWrite(fdDep *os.File, fields ...recfile.Field) error {
37 w := recfile.NewWriter(fdDep)
38 if _, err := w.RecordStart(); err != nil {
41 if _, err := w.WriteFields(fields...); err != nil {
47 func ifcreate(fdDep *os.File, tgt string) error {
48 trace(CDebug, "ifcreate: %s <- %s", fdDep.Name(), tgt)
51 recfile.Field{Name: "Type", Value: "ifcreate"},
52 recfile.Field{Name: "Target", Value: tgt},
56 func always(fdDep *os.File) error {
57 trace(CDebug, "always: %s", fdDep.Name())
58 return recfileWrite(fdDep, recfile.Field{Name: "Type", Value: "always"})
61 func stamp(fdDep, src *os.File) error {
63 hsh, err := fileHash(os.Stdin)
67 trace(CDebug, "stamp: %s <- %s", fdDep.Name(), hsh)
70 recfile.Field{Name: "Type", Value: "stamp"},
71 recfile.Field{Name: "Hash", Value: hsh},
75 func fileCtime(fd *os.File) (string, error) {
80 stat := fi.Sys().(*syscall.Stat_t)
81 sec, nsec := stat.Ctimespec.Unix()
82 return fmt.Sprintf("%d.%d", sec, nsec), nil
85 func fileHash(fd *os.File) (string, error) {
86 h, err := blake2b.New256(nil)
90 if _, err = io.Copy(h, bufio.NewReader(fd)); err != nil {
93 return hex.EncodeToString(h.Sum(nil)), nil
96 func writeDep(fdDep *os.File, cwd, tgt string) error {
97 trace(CDebug, "ifchange: %s <- %s", fdDep.Name(), tgt)
98 fd, err := os.Open(path.Join(cwd, tgt))
103 ts, err := fileCtime(fd)
107 fields := []recfile.Field{
108 recfile.Field{Name: "Type", Value: "ifchange"},
109 recfile.Field{Name: "Target", Value: tgt},
110 recfile.Field{Name: "Ctime", Value: ts},
114 hsh, err = fileHash(fd)
118 fields = append(fields, recfile.Field{Name: "Hash", Value: hsh})
120 err = recfileWrite(fdDep, fields...)
124 func writeDeps(fdDep *os.File, tgts []string) error {
126 trace(CDebug, "no opened fdDep: %s", tgts)
130 upLevels := strings.Count(os.Getenv(RedoDirPrefixEnv), "/")
131 for i := 0; i < upLevels; i++ {
132 ups = append(ups, "..")
134 up := path.Join(ups...)
135 for _, tgt := range tgts {
136 if _, err := os.Stat(tgt); err == nil {
137 if err = writeDep(fdDep, Cwd, path.Join(up, tgt)); err != nil {