agola/internal/util/git.go

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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 util
import (
"bufio"
"bytes"
"context"
"fmt"
"io"
"net/url"
"os"
"os/exec"
"regexp"
"strings"
"syscall"
errors "golang.org/x/xerrors"
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)
// scpSyntaxRe matches the SCP-like addresses used by Git to access repositories
// by SSH.
var scpSyntaxRe = regexp.MustCompile(`^([a-zA-Z0-9_]+)@([a-zA-Z0-9._-]+):(.*)$`)
func ParseGitURL(u string) (*url.URL, error) {
if m := scpSyntaxRe.FindStringSubmatch(u); m != nil {
// Match SCP-like syntax and convert it to a URL.
// Eg, "git@github.com:user/repo" becomes
// "ssh://git@github.com/user/repo".
return &url.URL{
Scheme: "ssh",
User: url.User(m[1]),
Host: m[2],
Path: m[3],
}, nil
}
return url.Parse(u)
}
type Git struct {
cmd *exec.Cmd
GitDir string
Env []string
}
func (g *Git) gitCmd(ctx context.Context, args ...string) *exec.Cmd {
cmd := exec.CommandContext(ctx, "git", args...)
// only keep the PATH, HOME and other useful env vars
cmdEnv := []string{}
cmdEnv = append(cmdEnv, "PATH="+os.Getenv("PATH"))
cmdEnv = append(cmdEnv, "HOME="+os.Getenv("HOME"))
cmdEnv = append(cmdEnv, "USER="+os.Getenv("USER"))
if g.GitDir != "" {
cmdEnv = append(cmdEnv, "GIT_DIR="+g.GitDir)
}
cmdEnv = append(cmdEnv, g.Env...)
cmd.Env = cmdEnv
return cmd
}
func (g *Git) Output(ctx context.Context, stdin io.Reader, args ...string) ([]byte, error) {
cmd := g.gitCmd(ctx, args...)
if stdin != nil {
cmd.Stdin = stdin
}
stderr := &bytes.Buffer{}
cmd.Stderr = stderr
out, err := cmd.Output()
if err != nil {
gitErr := stderr.String()
if len(gitErr) > 0 {
return nil, errors.New(stderr.String())
} else {
return nil, err
}
}
return out, err
}
func (g *Git) OutputLines(ctx context.Context, stdin io.Reader, args ...string) ([]string, error) {
out, err := g.Output(ctx, stdin, args...)
if err != nil {
return nil, err
}
scanner := bufio.NewScanner(bytes.NewReader(out))
lines := []string{}
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
if err := scanner.Err(); err != nil {
return nil, err
}
return lines, nil
}
func (g *Git) Pipe(ctx context.Context, w io.Writer, r io.Reader, args ...string) error {
cmd := g.gitCmd(ctx, args...)
cmd.Stdin = r
stdout, err := cmd.StdoutPipe()
if err != nil {
return err
}
stderr := &bytes.Buffer{}
cmd.Stderr = stderr
if err := cmd.Start(); err != nil {
return err
}
if _, err := io.Copy(w, stdout); err != nil {
return err
}
if err := cmd.Wait(); err != nil {
gitErr := stderr.String()
if len(gitErr) > 0 {
return errors.New(stderr.String())
} else {
return err
}
}
return nil
}
type ErrGitKeyNotFound struct {
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Key string
}
func (e *ErrGitKeyNotFound) Error() string {
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return fmt.Sprintf("key `%q` was not found", e.Key)
}
func (g *Git) ConfigGet(ctx context.Context, args ...string) (string, error) {
args = append([]string{"config", "--get", "--null"}, args...)
out, err := g.Output(ctx, nil, args...)
if err != nil {
if exitError, ok := err.(*exec.ExitError); ok {
if waitStatus, ok := exitError.Sys().(syscall.WaitStatus); ok {
if waitStatus.ExitStatus() == 1 {
return "", &ErrGitKeyNotFound{Key: args[len(args)-1]}
}
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}
}
return "", err
}
return strings.TrimRight(string(out), "\000"), nil
}
func (g *Git) ConfigSet(ctx context.Context, args ...string) (string, error) {
args = append([]string{"config", "--null"}, args...)
out, err := g.Output(ctx, nil, args...)
if err != nil {
if exitError, ok := err.(*exec.ExitError); ok {
if waitStatus, ok := exitError.Sys().(syscall.WaitStatus); ok {
if waitStatus.ExitStatus() == 1 {
return "", &ErrGitKeyNotFound{Key: args[len(args)-1]}
}
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}
}
return "", err
}
return strings.TrimRight(string(out), "\000"), nil
}