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package main
// see `man 5 githooks` for details
import (
"errors"
"fmt"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
)
func main() {
log.SetFlags(0)
defer log.Println("Exiting craft")
log.Println("Starting craft")
hookType := getHookType()
log.Printf("Git hook type: %s\n", hookType)
repo := getRepositoryPath()
log.Printf("Git repository: %s\n", repo)
for {
eof, update := getUpdate()
if eof {
break
}
log.Printf("Git ref update: %s\n", update)
commit := update.updated
_ = prepareWorkbench(repo, commit)
}
}
func runCommand(name string, args ...string) {
log.Printf("%s %s\n", name, strings.Join(args, " "))
command := exec.Command(name, args...)
err := command.Run()
if err != nil {
log.Fatal(err)
}
}
func prepareWorkbench(repo string, commit string) string {
workbench, err := os.MkdirTemp("", "*-craft")
if err != nil {
log.Fatal(err)
}
defer os.RemoveAll(workbench)
runCommand(
"git",
"clone",
repo,
workbench,
)
runCommand(
"git",
"--git-dir",
filepath.Join(workbench, ".git"),
"--work-tree",
workbench,
"checkout",
commit,
)
return workbench
}
func getHookType() string {
args := len(os.Args)
if args != 1 {
log.Fatalf("Expected zero arguments but %d were given", args-1)
}
prefix := `hooks/`
path := os.Args[0]
hookType := strings.TrimPrefix(path, prefix)
if path == hookType {
log.Fatalf("Hook path '%s' has no '%s' prefix", path, prefix)
}
validateHookType(hookType)
return hookType
}
func validateHookType(hookType string) {
validTypes := [...]string{
`post-receive`,
}
for _, currentType := range validTypes {
if hookType == currentType {
return
}
}
log.Fatalf("Not supported Git hook type '%s'\n", hookType)
}
func getRepositoryPath() string {
cwd, err := os.Getwd()
if err != nil {
log.Fatal(err)
}
return cwd
}
type update struct {
old, updated, ref string
}
func (u update) String() string {
ret := fmt.Sprintf("'%s' from '%s' to '%s'", u.ref, u.old, u.updated)
return ret
}
func getUpdate() (bool, update) {
var u update
_, err := fmt.Scanf("%s %s %s\n", &u.old, &u.updated, &u.ref)
if err != nil {
if errors.Is(err, io.EOF) {
return true, u
} else {
log.Fatal(err)
}
}
return false, u
}
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