// Make commit and rollback functions for things that mess with
// the git config file. This works by saving the contents of the
// git config file, and then discarding the saved changes or writing them out.
func configCheckpointer(r *git.Repo) (commit, rollback func(chan<- bool)) {
configPath := filepath.Join(r.GitDir, "config")
stat, err := os.Stat(configPath)
if err != nil {
log.Printf("Error stat'ing %s:\n", configPath)
panic(err)
}
if !stat.Mode().IsRegular() {
log.Panicf("Git config file %s is not a file!\n", configPath)
}
configContents, err := ioutil.ReadFile(configPath)
if err != nil {
log.Printf("Error opening %s\n", configPath)
panic(err)
}
// By now we have saved the current config file contents.
// No action for commit, we want to leave the new config alone.
commit = noopCommit
// On rollback, restore the old config.
rollback = func(c chan<- bool) {
err := ioutil.WriteFile(configPath, configContents, os.FileMode(777))
if err != nil {
log.Printf("Failed to restore old config file %s\n", configPath)
c <- false
} else {
c <- true
}
r.ReloadConfig()
}
return commit, rollback
}
