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|
package runner
import (
"archive/tar"
"context"
"crypto/rand"
"encoding/hex"
"errors"
"fmt"
"io"
"io/fs"
"path"
"strings"
git "github.com/go-git/go-git/v5"
config "github.com/go-git/go-git/v5/config"
"github.com/go-git/go-git/v5/plumbing"
"github.com/go-git/go-git/v5/plumbing/object"
"github.com/go-git/go-git/v5/plumbing/transport"
"github.com/go-git/go-git/v5/plumbing/transport/http"
)
type ActionCache interface {
Fetch(ctx context.Context, cacheDir, url, ref, token string) (string, error)
GetTarArchive(ctx context.Context, cacheDir, sha, includePrefix string) (io.ReadCloser, error)
}
type GoGitActionCache struct {
Path string
}
func (c GoGitActionCache) Fetch(ctx context.Context, cacheDir, url, ref, token string) (string, error) {
gitPath := path.Join(c.Path, safeFilename(cacheDir)+".git")
gogitrepo, err := git.PlainInit(gitPath, true)
if errors.Is(err, git.ErrRepositoryAlreadyExists) {
gogitrepo, err = git.PlainOpen(gitPath)
}
if err != nil {
return "", err
}
tmpBranch := make([]byte, 12)
if _, err := rand.Read(tmpBranch); err != nil {
return "", err
}
branchName := hex.EncodeToString(tmpBranch)
var refSpec config.RefSpec
spec := config.RefSpec(ref + ":" + branchName)
tagOrSha := false
if spec.IsExactSHA1() {
refSpec = spec
} else if strings.HasPrefix(ref, "refs/") {
refSpec = config.RefSpec(ref + ":refs/heads/" + branchName)
} else {
tagOrSha = true
refSpec = config.RefSpec("refs/*/" + ref + ":refs/heads/*/" + branchName)
}
var auth transport.AuthMethod
if token != "" {
auth = &http.BasicAuth{
Username: "token",
Password: token,
}
}
remote, err := gogitrepo.CreateRemoteAnonymous(&config.RemoteConfig{
Name: "anonymous",
URLs: []string{
url,
},
})
if err != nil {
return "", err
}
defer func() {
if refs, err := gogitrepo.References(); err == nil {
_ = refs.ForEach(func(r *plumbing.Reference) error {
if strings.Contains(r.Name().String(), branchName) {
return gogitrepo.DeleteBranch(r.Name().String())
}
return nil
})
}
}()
if err := remote.FetchContext(ctx, &git.FetchOptions{
RefSpecs: []config.RefSpec{
refSpec,
},
Auth: auth,
Force: true,
}); err != nil {
if tagOrSha && errors.Is(err, git.NoErrAlreadyUpToDate) {
return "", fmt.Errorf("couldn't find remote ref \"%s\"", ref)
}
return "", err
}
if tagOrSha {
for _, prefix := range []string{"refs/heads/tags/", "refs/heads/heads/"} {
hash, err := gogitrepo.ResolveRevision(plumbing.Revision(prefix + branchName))
if err == nil {
return hash.String(), nil
}
}
}
hash, err := gogitrepo.ResolveRevision(plumbing.Revision(branchName))
if err != nil {
return "", err
}
return hash.String(), nil
}
func (c GoGitActionCache) GetTarArchive(ctx context.Context, cacheDir, sha, includePrefix string) (io.ReadCloser, error) {
gitPath := path.Join(c.Path, safeFilename(cacheDir)+".git")
gogitrepo, err := git.PlainOpen(gitPath)
if err != nil {
return nil, err
}
commit, err := gogitrepo.CommitObject(plumbing.NewHash(sha))
if err != nil {
return nil, err
}
files, err := commit.Files()
if err != nil {
return nil, err
}
rpipe, wpipe := io.Pipe()
// Interrupt io.Copy using ctx
ch := make(chan int, 1)
go func() {
select {
case <-ctx.Done():
wpipe.CloseWithError(ctx.Err())
case <-ch:
}
}()
go func() {
defer wpipe.Close()
defer close(ch)
tw := tar.NewWriter(wpipe)
cleanIncludePrefix := path.Clean(includePrefix)
wpipe.CloseWithError(files.ForEach(func(f *object.File) error {
if err := ctx.Err(); err != nil {
return err
}
name := f.Name
if strings.HasPrefix(name, cleanIncludePrefix+"/") {
name = name[len(cleanIncludePrefix)+1:]
} else if cleanIncludePrefix != "." && name != cleanIncludePrefix {
return nil
}
fmode, err := f.Mode.ToOSFileMode()
if err != nil {
return err
}
if fmode&fs.ModeSymlink == fs.ModeSymlink {
content, err := f.Contents()
if err != nil {
return err
}
return tw.WriteHeader(&tar.Header{
Name: name,
Mode: int64(fmode),
Linkname: content,
})
}
err = tw.WriteHeader(&tar.Header{
Name: name,
Mode: int64(fmode),
Size: f.Size,
})
if err != nil {
return err
}
reader, err := f.Reader()
if err != nil {
return err
}
_, err = io.Copy(tw, reader)
return err
}))
}()
return rpipe, err
}
|
