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package service
import (
"errors"
"fmt"
"os"
"os/exec"
"path"
"strings"
"git.server.ky/slackcoder/mirror/internal"
)
const gitDescriptionFile = "description"
func mapExecError(err error) error {
if ee, ok := err.(*exec.ExitError); ok {
return errors.New(string(ee.Stderr))
}
return err
}
// Set the description for the projects repository.
func setDescription(repo string, desc string) error {
descPath := path.Join(repo, gitDescriptionFile)
var curDesc string
buf, err := os.ReadFile(descPath)
if os.IsNotExist(err) {
// empty
} else if err != nil {
return err
} else {
curDesc = string(buf)
}
if curDesc != desc {
err = os.WriteFile(descPath, []byte(desc), 0750)
if err != nil {
return err
}
}
return nil
}
// Set the remote origin's URL for the projects repository.
func setRemoteOrigin(repo string, origin *internal.URL) error {
cmd := exec.Command("git", "remote", "get-url", "origin")
cmd.Dir = repo
buf, err := cmd.Output()
if err != nil {
return fmt.Errorf("getting current project remote origin: %w", err)
}
currentOrigin := strings.TrimSpace(string(buf))
if currentOrigin != origin.String() {
cmd = exec.Command("git", "remote", "set-url", "origin", origin.String())
cmd.Dir = repo
err = cmd.Run()
if err != nil {
err = mapExecError(err)
return fmt.Errorf("setting project remote origin: %w", err)
}
}
return nil
}
func getRemoteHeadReference(repo string) (string, error) {
cmd := exec.Command("git", "ls-remote", "--symref", "origin", "HEAD")
cmd.Dir = repo
buf, err := cmd.Output()
if err != nil {
return "", mapExecError(err)
}
for _, l := range strings.Split(string(buf), "\n") {
fields := strings.Fields(l)
if len(fields) != 3 {
return "", errors.New("unexpected output from 'git ls-remote'")
}
if fields[0] == "ref:" {
return strings.TrimPrefix(fields[1], "refs/heads/"), nil
}
}
return "", errors.New("not found")
}
func MirrorGit(dst *internal.URL, src *internal.URL, description string) error {
if dst.Scheme != "" && dst.Scheme != "file://" {
return fmt.Errorf("'%s' scheme not supported", dst.Scheme)
}
if _, err := os.Stat(dst.Path); os.IsNotExist(err) {
err = os.MkdirAll(path.Join(dst.Path, ".."), 0750)
if err != nil {
return fmt.Errorf("creating new mirror: %w", err)
}
cmd := exec.Command("git", "clone", "--bare", "--single-branch", src.String(), dst.String())
cmd.Dir = path.Join(dst.Path, "..")
err := cmd.Run()
if err != nil {
err = mapExecError(err)
return fmt.Errorf("cloning: %s", err)
}
// Git mirrors are not good places for mirrored assets.
cmd = exec.Command("git", "config", "set", "cgit.snapshots", "none")
cmd.Dir = dst.Path
err = cmd.Run()
if err != nil {
err = mapExecError(err)
return fmt.Errorf("disabling cgit snapshots: %s", err)
}
}
err := setDescription(dst.Path, description)
if err != nil {
return err
}
err = setRemoteOrigin(dst.Path, src)
if err != nil {
return err
}
branch, err := getRemoteHeadReference(dst.Path)
if err != nil {
return fmt.Errorf("guessing remote default branch: %w", err)
}
cmd := exec.Command("git", "fetch", "--tags", "origin", branch+":"+branch)
cmd.Dir = dst.Path
err = cmd.Run()
if err != nil {
err = mapExecError(err)
return fmt.Errorf("fetching project: %s", err)
}
return nil
}
|
