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/>.
18 // Out-of-date determination
31 "go.cypherpunks.ru/recfile"
35 DepTypeIfcreate = "ifcreate"
36 DepTypeIfchange = "ifchange"
37 DepTypeAlways = "always"
38 DepTypeStamp = "stamp"
46 func (e TgtErr) Unwrap() error { return e.Err }
48 func (e TgtErr) Error() string {
49 return fmt.Sprintf("%s: %s", e.Tgt, e.Err)
52 func cwdMustRel(paths ...string) string {
53 rel, err := filepath.Rel(Cwd, path.Join(paths...))
60 func cwdAndTgt(tgt string) (string, string) {
61 cwd, tgt := path.Split(tgt)
62 cwd, err := filepath.Abs(cwd)
69 func isSrc(cwd, tgt string) bool {
70 d, f := path.Split(path.Join(cwd, tgt))
71 if _, err := os.Stat(path.Join(d, f)); err != nil {
74 if _, err := os.Stat(path.Join(d, RedoDir, f+DepSuffix)); err == nil {
86 ifchanges []map[string]string
89 func depRead(fdDep *os.File) (*DepInfo, error) {
90 r := recfile.NewReader(fdDep)
96 if b := m["Build"]; b == "" {
97 return nil, errors.New(".dep missing Build:")
102 m, err := r.NextMap()
111 depInfo.always = true
112 case DepTypeIfcreate:
115 return nil, errors.New("invalid format of .dep")
117 depInfo.ifcreates = append(depInfo.ifcreates, dep)
118 case DepTypeIfchange:
120 depInfo.ifchanges = append(depInfo.ifchanges, m)
124 return nil, errors.New("invalid format of .dep")
127 depInfo.stampSame = m["Same"] == "true"
129 return nil, errors.New("invalid format of .dep")
135 func rebuildStamped(cwd, tgt, depPath, stampPrev string) (bool, error) {
136 relTgt := cwdMustRel(cwd, tgt)
137 errs := make(chan error, 1)
138 if err := runScript(relTgt, errs, stampPrev); err != nil {
141 if err := <-errs; !isOkRun(err) {
142 return false, errors.New("build failed")
144 fdDep, err := os.Open(depPath)
149 depInfo, err := depRead(fdDep)
153 if depInfo.build != BuildUUID {
154 return false, errors.New("is not built")
156 return depInfo.stampSame, nil
159 func formDepPath(cwd, tgt string) string {
160 cwd, tgt = cwdAndTgt(path.Join(cwd, tgt))
161 return path.Join(cwd, RedoDir, tgt+DepSuffix)
164 func isOOD(cwd, tgtOrig string, level int, depInfo *DepInfo) (bool, error) {
165 indent := strings.Repeat(". ", level)
166 trace(CDebug, "ood: %s%s checking", indent, tgtOrig)
167 cwd, tgt := cwdAndTgt(path.Join(cwd, tgtOrig))
168 depPath := formDepPath(cwd, tgt)
170 fdDep, err := os.Open(depPath)
172 trace(CDebug, "ood: %s%s -> no dep: %s", indent, tgtOrig, depPath)
176 depInfo, err = depRead(fdDep)
178 return true, TgtErr{tgtOrig, err}
182 if depInfo.build == BuildUUID {
183 trace(CDebug, "ood: %s%s -> already built", indent, tgtOrig)
186 ood := depInfo.always
191 for _, dep := range depInfo.ifcreates {
192 if _, err := os.Stat(path.Join(cwd, dep)); err == nil {
193 trace(CDebug, "ood: %s%s -> %s created", indent, tgtOrig, dep)
199 for _, m := range depInfo.ifchanges {
201 theirTs := m["Ctime"]
202 theirHsh := m["Hash"]
203 if dep == "" || theirTs == "" {
204 return ood, TgtErr{tgtOrig, errors.New("invalid format of .dep")}
206 trace(CDebug, "ood: %s%s -> %s: checking", indent, tgtOrig, dep)
208 fd, err := os.Open(path.Join(cwd, dep))
210 if os.IsNotExist(err) {
211 trace(CDebug, "ood: %s%s -> %s: not exists", indent, tgtOrig, dep)
215 return ood, TgtErr{tgtOrig, err}
219 var depDepInfo *DepInfo
220 if !(dep == tgt || isSrc(cwd, dep)) {
221 trace(CDebug, "ood: %s%s -> %s: prereading .dep", indent, tgtOrig, dep)
222 depFdDep, err := os.Open(formDepPath(cwd, dep))
224 return ood, TgtErr{path.Join(tgtOrig, dep), err}
226 defer depFdDep.Close()
227 depDepInfo, err = depRead(depFdDep)
229 return ood, TgtErr{path.Join(tgtOrig, dep), err}
233 if depDepInfo != nil && depDepInfo.build == BuildUUID {
235 CDebug, "ood: %s%s -> %s: .dep says build is same",
236 indent, tgtOrig, dep,
238 if !depDepInfo.stampSame {
240 CDebug, "ood: %s%s -> %s: .dep says stamp is not same",
241 indent, tgtOrig, dep,
247 CDebug, "ood: %s%s -> %s: .dep says stamp is same",
248 indent, tgtOrig, dep,
253 if depDepInfo == nil || !depDepInfo.always && depDepInfo.stamp == "" {
254 ts, err := fileCtime(fd)
256 return ood, TgtErr{tgtOrig, err}
259 trace(CDebug, "ood: %s%s -> %s: same ctime", indent, tgtOrig, dep)
260 } else if NoHash || theirHsh == "" {
261 trace(CDebug, "ood: %s%s -> %s: ctime differs", indent, tgtOrig, dep)
265 hsh, err := fileHash(fd)
267 return ood, TgtErr{tgtOrig, err}
270 trace(CDebug, "ood: %s%s -> %s: hash differs", indent, tgtOrig, dep)
274 trace(CDebug, "ood: %s%s -> %s: same hash", indent, tgtOrig, dep)
279 trace(CDebug, "ood: %s%s -> %s: same target", indent, tgtOrig, dep)
283 trace(CDebug, "ood: %s%s -> %s: is source", indent, tgtOrig, dep)
287 depOod, err := isOOD(cwd, dep, level+1, depDepInfo)
289 return ood, TgtErr{tgtOrig, err}
292 trace(CDebug, "ood: %s%s -> %s: ood", indent, tgtOrig, dep)
296 trace(CDebug, "ood: %s%s -> %s: !ood", indent, tgtOrig, dep)
300 if ood && depInfo.stamp != "" {
301 trace(CDebug, "ood: %s%s run, because stamped", indent, tgtOrig)
302 stampSame, err := rebuildStamped(cwd, tgt, depPath, depInfo.stamp)
304 return true, TgtErr{tgtOrig, err}
306 trace(CDebug, "ood: %s%s -> stamp: same: %v", indent, tgtOrig, stampSame)
309 trace(CDebug, "ood: %s%s: %v", indent, tgtOrig, ood)