Add git save implementation

This commit is contained in:
Simone Gotti 2019-02-21 16:06:18 +01:00
parent fd486bbe09
commit 6f55ab1d38
1 changed files with 224 additions and 0 deletions

224
internal/git-save/save.go Normal file
View File

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// Copyright 2019 Sorint.lab
//
// 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.
package gitsave
import (
"context"
"io"
"os"
"path/filepath"
"github.com/sorintlab/agola/internal/util"
"github.com/pkg/errors"
"go.uber.org/zap"
)
const (
gitIndexFile = "index"
gitRefsPrefix = "refs/gitsave"
)
func copyFile(src, dest string) error {
srcf, err := os.Open(src)
if err != nil {
return err
}
defer srcf.Close()
destf, err := os.Create(dest)
if err != nil {
return err
}
defer destf.Close()
_, err = io.Copy(destf, srcf)
return err
}
func fileExists(path string) (bool, error) {
_, err := os.Stat(path)
if err != nil && !os.IsNotExist(err) {
return false, err
}
return !os.IsNotExist(err), nil
}
// GitDir returns the git dir relative to the working dir
func GitDir() (string, error) {
git := &util.Git{}
lines, err := git.OutputLines(context.Background(), nil, "rev-parse", "--git-dir")
if err != nil {
return "", err
}
if len(lines) != 1 {
return "", errors.Errorf("received %d lines, expected one line", len(lines))
}
return lines[0], err
}
func currentGitBranch() (string, error) {
git := &util.Git{}
lines, err := git.OutputLines(context.Background(), nil, "symbolic-ref", "--short", "HEAD")
if err != nil {
return "", err
}
if len(lines) != 1 {
return "", errors.Errorf("received %d lines, expected one line", len(lines))
}
return lines[0], err
}
// gitDir returns the git dir relative to the working dir
func gitWriteTree(indexPath string) (string, error) {
git := &util.Git{Env: []string{"GIT_INDEX_FILE=" + indexPath}}
lines, err := git.OutputLines(context.Background(), nil, "write-tree")
if err != nil {
return "", err
}
if len(lines) != 1 {
return "", errors.Errorf("received %d lines, expected one line", len(lines))
}
return lines[0], err
}
func gitCommitTree(message, treeSHA string) (string, error) {
git := &util.Git{}
lines, err := git.OutputLines(context.Background(), nil, "commit-tree", "-m", message, treeSHA)
if err != nil {
return "", err
}
if len(lines) != 1 {
return "", errors.Errorf("received %d lines, expected one line", len(lines))
}
return lines[0], err
}
func gitUpdateRef(message, ref, commitSHA string) error {
git := &util.Git{}
_, err := git.Output(context.Background(), nil, "update-ref", "-m", message, ref, commitSHA)
return err
}
func gitAddUntrackedFiles(indexPath string) error {
git := &util.Git{Env: []string{"GIT_INDEX_FILE=" + indexPath}}
_, err := git.Output(context.Background(), nil, "add", ".")
return err
}
func gitAddIgnoredFiles(indexPath string) error {
git := &util.Git{Env: []string{"GIT_INDEX_FILE=" + indexPath}}
_, err := git.Output(context.Background(), nil, "add", "-f", "-A", ".")
return err
}
func GitAddRemote(configPath, name, url string) error {
git := &util.Git{}
_, err := git.Output(context.Background(), nil, "remote", "add", name, url)
return err
}
func GitPush(configPath, remote, branch string) error {
git := &util.Git{}
_, err := git.Output(context.Background(), nil, "push", remote, branch, "-f")
return err
}
type GitSaveConfig struct {
AddUntracked bool
AddIgnored bool
}
type GitSave struct {
log *zap.SugaredLogger
conf *GitSaveConfig
}
func NewGitSave(logger *zap.Logger, conf *GitSaveConfig) *GitSave {
return &GitSave{log: logger.Sugar(), conf: conf}
}
// Save adds files to the provided index, creates a tree and a commit pointing to
// that tree, finally it creates a branch poiting to that commit
// Save will use the current worktree index if available to speed the index generation
func (s *GitSave) Save(tmpIndexPath, message, branchName string) error {
gitdir, err := GitDir()
if err != nil {
return err
}
indexPath := filepath.Join(gitdir, gitIndexFile)
curBranch, err := currentGitBranch()
if err != nil {
return err
}
indexExists, err := fileExists(indexPath)
if err != nil {
return err
}
if indexExists {
// copy current git index to a temporary index
if err := copyFile(indexPath, tmpIndexPath); err != nil {
return err
}
s.log.Infof("created temporary index: %s", tmpIndexPath)
// read the current branch tree information into the index
git := &util.Git{Env: []string{"GIT_INDEX_FILE=" + tmpIndexPath}}
_, err = git.Output(context.Background(), nil, "read-tree", curBranch)
if err != nil {
return err
}
} else {
s.log.Infof("index %s does not exist", indexPath)
}
if s.conf.AddUntracked {
s.log.Infof("adding untracked files")
if err := gitAddUntrackedFiles(tmpIndexPath); err != nil {
return err
}
}
if s.conf.AddIgnored {
s.log.Infof("adding ignored files")
if err := gitAddIgnoredFiles(tmpIndexPath); err != nil {
return err
}
}
s.log.Infof("writing tree file")
treeSHA, err := gitWriteTree(tmpIndexPath)
if err != nil {
return err
}
s.log.Infof("tree: %s", treeSHA)
s.log.Infof("committing tree")
commitSHA, err := gitCommitTree("git-save", treeSHA)
if err != nil {
return err
}
s.log.Infof("commit: %s", commitSHA)
s.log.Infof("updating ref")
if err = gitUpdateRef("git-save", filepath.Join(gitRefsPrefix, branchName), commitSHA); err != nil {
return err
}
return nil
}