/
git.go
166 lines (138 loc) · 3.89 KB
/
git.go
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// Copyright The Enterprise Contract Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// SPDX-License-Identifier: Apache-2.0
package tracker
import (
"context"
"errors"
"fmt"
"io"
"os"
"strings"
"sync"
gba "github.com/Maldris/go-billy-afero"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/plumbing/cache"
"github.com/go-git/go-git/v5/plumbing/object"
"github.com/go-git/go-git/v5/storage/filesystem"
"github.com/spf13/afero"
"github.com/enterprise-contract/ec-cli/internal/utils"
)
type gitTracker struct {
repositories *sync.Map
}
func NewGitTracker() *gitTracker {
g := gitTracker{}
g.repositories = &sync.Map{}
return &g
}
func (g gitTracker) Close(ctx context.Context) {
fs := utils.FS(ctx)
g.repositories.Range(func(_, val any) bool {
r, err := val.(func() (*git.Repository, error))()
if err != nil {
return true
}
bfs := r.Storer.(*filesystem.Storage).Filesystem()
// ignore error
_ = fs.RemoveAll(bfs.Root())
return true
})
}
func clone(ctx context.Context, repository string) (*git.Repository, error) {
fs := utils.FS(ctx)
tmpdir, err := afero.TempDir(fs, "", "ec-git")
if err != nil {
return nil, err
}
bfs, err := gba.New(fs, "", false).Chroot(tmpdir)
if err != nil {
return nil, err
}
s := filesystem.NewStorage(bfs, cache.NewObjectLRUDefault())
opts := git.CloneOptions{
URL: strings.TrimPrefix(repository, "git+"),
NoCheckout: true,
}
// set by acceptance tests
if os.Getenv("GIT_SSL_NO_VERIFY") == "true" {
opts.InsecureSkipTLS = true
}
return git.CloneContext(ctx, s, bfs, &opts)
}
func (g *gitTracker) GitResolve(ctx context.Context, repository, path string) (string, error) {
cfn := func() (*git.Repository, error) {
return clone(ctx, repository)
}
rfn, _ := g.repositories.LoadOrStore(repository, sync.OnceValues(cfn))
r, err := rfn.(func() (*git.Repository, error))()
if err != nil {
return "", err
}
commits, err := r.Log(&git.LogOptions{
FileName: &path,
Order: git.LogOrderCommitterTime,
})
if err != nil {
return "", err
}
defer commits.Close()
var c *object.Commit
outer:
for {
c, err = commits.Next()
if err != nil {
if errors.Is(err, io.EOF) {
return "", fmt.Errorf("unable to find any commits for path: %q", path)
}
return "", err
}
if c == nil {
break
}
noParents := c.NumParents()
if noParents == 0 {
// initial commit
if _, err := c.File(path); err != nil && err != object.ErrFileNotFound {
return "", err
}
return c.ID().String(), nil
} else if noParents == 1 {
// first commit with only one parent is a non-merge commit, even though
// a merge commit is a valid commit id for a change on the path we want
// to filter out the merge commits as the default UIs in GitHub
// (GitLab?) do not show the merge commits in the file history views
parent, err := c.Parent(0)
if err != nil {
return "", err
}
// we get commits that didn't change the path, so filter to only
// those that did
p, _ := parent.Patch(c)
for _, f := range p.FilePatches() {
from, to := f.Files()
if (from != nil && to != nil && from.Path() == path) || (to != nil && to.Path() == path) {
// the first commit that did change the file is the latest
// for that file
break outer
}
}
}
}
if c == nil {
return "", fmt.Errorf("unable to find any commits for path: %q", path)
}
return c.ID().String(), nil
}