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package git_commands
import (
"fmt"
"os"
"path/filepath"
"strings"
)
type BisectCommands struct {
*GitCommon
}
func NewBisectCommands(gitCommon *GitCommon) *BisectCommands {
return &BisectCommands{
GitCommon: gitCommon,
}
}
// This command is pretty cheap to run so we're not storing the result anywhere.
// But if it becomes problematic we can chang that.
func (self *BisectCommands) GetInfo() *BisectInfo {
var err error
info := &BisectInfo{started: false, log: self.Log, newTerm: "bad", oldTerm: "good"}
// we return nil if we're not in a git bisect session.
// we know we're in a session by the presence of a .git/BISECT_START file
bisectStartPath := filepath.Join(self.dotGitDir, "BISECT_START")
exists, err := self.os.FileExists(bisectStartPath)
if err != nil {
self.Log.Infof("error getting git bisect info: %s", err.Error())
return info
}
if !exists {
return info
}
startContent, err := os.ReadFile(bisectStartPath)
if err != nil {
self.Log.Infof("error getting git bisect info: %s", err.Error())
return info
}
info.started = true
info.start = strings.TrimSpace(string(startContent))
termsContent, err := os.ReadFile(filepath.Join(self.dotGitDir, "BISECT_TERMS"))
if err != nil {
// old git versions won't have this file so we default to bad/good
} else {
splitContent := strings.Split(string(termsContent), "\n")
info.newTerm = splitContent[0]
info.oldTerm = splitContent[1]
}
bisectRefsDir := filepath.Join(self.dotGitDir, "refs", "bisect")
files, err := os.ReadDir(bisectRefsDir)
if err != nil {
self.Log.Infof("error getting git bisect info: %s", err.Error())
return info
}
info.statusMap = make(map[string]BisectStatus)
for _, file := range files {
status := BisectStatusSkipped
name := file.Name()
path := filepath.Join(bisectRefsDir, name)
fileContent, err := os.ReadFile(path)
if err != nil {
self.Log.Infof("error getting git bisect info: %s", err.Error())
return info
}
sha := strings.TrimSpace(string(fileContent))
if name == info.newTerm {
status = BisectStatusNew
} else if strings.HasPrefix(name, info.oldTerm+"-") {
status = BisectStatusOld
} else if strings.HasPrefix(name, "skipped-") {
status = BisectStatusSkipped
}
info.statusMap[sha] = status
}
currentContent, err := os.ReadFile(filepath.Join(self.dotGitDir, "BISECT_EXPECTED_REV"))
if err != nil {
self.Log.Infof("error getting git bisect info: %s", err.Error())
return info
}
currentSha := strings.TrimSpace(string(currentContent))
info.current = currentSha
return info
}
func (self *BisectCommands) Reset() error {
return self.cmd.New("git bisect reset").StreamOutput().Run()
}
func (self *BisectCommands) Mark(ref string, term string) error {
return self.cmd.New(
fmt.Sprintf("git bisect %s %s", term, ref),
).
IgnoreEmptyError().
StreamOutput().
Run()
}
func (self *BisectCommands) Skip(ref string) error {
return self.Mark(ref, "skip")
}
func (self *BisectCommands) Start() error {
return self.cmd.New("git bisect start").StreamOutput().Run()
}
// tells us whether we've found our problem commit(s). We return a string slice of
// commit sha's if we're done, and that slice may have more that one item if
// skipped commits are involved.
func (self *BisectCommands) IsDone() (bool, []string, error) {
info := self.GetInfo()
if !info.Bisecting() {
return false, nil, nil
}
newSha := info.GetNewSha()
if newSha == "" {
return false, nil, nil
}
// if we start from the new commit and reach the a good commit without
// coming across any unprocessed commits, then we're done
done := false
candidates := []string{}
err := self.cmd.New(fmt.Sprintf("git rev-list %s", newSha)).RunAndProcessLines(func(line string) (bool, error) {
sha := strings.TrimSpace(line)
if status, ok := info.statusMap[sha]; ok {
switch status {
case BisectStatusSkipped, BisectStatusNew:
candidates = append(candidates, sha)
return false, nil
case BisectStatusOld:
done = true
return true, nil
}
} else {
return true, nil
}
// should never land here
return true, nil
})
if err != nil {
return false, nil, err
}
return done, candidates, nil
}
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