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repo.go
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repo.go
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// Copyright 2018 Microsoft Corporation
//
// 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 repo
import (
"errors"
"fmt"
"io/ioutil"
"os"
"os/exec"
"strings"
)
// WorkingTree encapsulates a git repository.
type WorkingTree struct {
dir string
}
// Get returns a WorkingTree for the specified directory. If the directory is not the
// root of a git repository the directory hierarchy is walked to find the root (i.e. the
// directory where the .git dir resides).
func Get(dir string) (wt WorkingTree, err error) {
orig := dir
for found := false; !found; {
var fi []os.FileInfo
fi, err = ioutil.ReadDir(dir)
if err != nil {
return
}
// look for the .git directory
for _, f := range fi {
if f.Name() == ".git" {
found = true
break
}
}
if !found {
// not the root of the repo, move to parent directory
i := strings.LastIndexByte(dir, os.PathSeparator)
if i < 0 {
err = fmt.Errorf("failed to find repo root under '%s'", orig)
return
}
dir = dir[:i]
}
}
wt.dir = dir
return
}
// Branch calls "git branch" to determine the current branch.
func (tw WorkingTree) Branch() (string, error) {
cmd := exec.Command("git", "branch")
output, err := cmd.CombinedOutput()
if err != nil {
return "", errors.New(string(output))
}
branches := strings.Split(string(output), "\n")
for _, branch := range branches {
if branch[0] == '*' {
return branch[2:], nil
}
}
return "", fmt.Errorf("failed to determine active branch: %s", strings.Join(branches, ","))
}
// Clone calls "git clone", cloning the working tree into the specified directory.
// The returned WorkingTree points to the clone of the repository.
func (wt WorkingTree) Clone(dest string) (result WorkingTree, err error) {
cmd := exec.Command("git", "clone", fmt.Sprintf("file://%s", wt.dir), dest)
output, err := cmd.CombinedOutput()
if err != nil {
err = errors.New(string(output))
return
}
result.dir = dest
return
}
// Checkout calls "git checkout" with the specified tree.
func (wt WorkingTree) Checkout(tree string) error {
cmd := exec.Command("git", "checkout", tree)
cmd.Dir = wt.dir
output, err := cmd.CombinedOutput()
if err != nil {
return errors.New(string(output))
}
return nil
}
// Root returns the root directory of the working tree.
func (wt WorkingTree) Root() string {
return wt.dir
}
// CherryCommit contains an entry returned by the "git cherry" command.
type CherryCommit struct {
// Hash is the SHA1 of the commit.
Hash string
// Found indicates if the commit was found in the upstream branch.
Found bool
}
// Cherry calls "git cherry" with the specified value for upstream.
// Returns a slice of commits yet to be applied to the specified upstream branch.
func (wt WorkingTree) Cherry(upstream string) ([]CherryCommit, error) {
cmd := exec.Command("git", "cherry", upstream)
cmd.Dir = wt.dir
output, err := cmd.CombinedOutput()
if err != nil {
return nil, errors.New(string(output))
}
items := strings.Split(string(output), "\n")
// skip the last entry as it's just an empty string
commits := make([]CherryCommit, len(items)-1, len(items)-1)
for i := 0; i < len(items)-1; i++ {
commits[i].Found = items[i][0] == '-'
commits[i].Hash = items[i][2:]
}
return commits, nil
}
// CherryPick calls "git cherry-pick" with the specified commit.
func (wt WorkingTree) CherryPick(commit string) error {
cmd := exec.Command("git", "cherry-pick", commit)
cmd.Dir = wt.dir
output, err := cmd.CombinedOutput()
if err != nil {
return errors.New(string(output))
}
return nil
}