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git.go
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git.go
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/*
* Teleport
* Copyright (C) 2023 Gravitational, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"bytes"
"os/exec"
"strings"
"github.com/gravitational/trace"
)
const (
// gitFileNotExistsError is error message returned from git when the file
// does not exists in this revision
gitFileNotExistsError = "exists on disk, but not in"
)
// gitIsAvailable returns status of git
func gitIsAvailable() error {
_, err := exec.LookPath("git")
return err
}
// git runs git and returns output (stdout/stderr, depends on the cmd result) and error
func git(dir string, args ...string) (string, error) {
var stdout bytes.Buffer
var stderr bytes.Buffer
cmd := exec.Command("git", args...)
cmd.Stdout = &stdout
cmd.Stderr = &stderr
cmd.Dir = dir
err := cmd.Run()
if err != nil {
return strings.TrimSpace(stderr.String()), trace.Wrap(err)
}
return strings.TrimSpace(stdout.String()), nil
}
// gitLatestCommit returns sha of the latest commit
//
// Runs: git log -1 --format=%H
func gitLatestCommitSha(path string) (string, error) {
sha, err := git(path, "log", "--pretty=oneline", "-1", "--format=%H")
if err != nil {
return sha, trace.Errorf("%w : Error returned by `git log -1 --format=%%H", err)
}
return sha, nil
}
// gitMergeBase returns git ref of fork point
//
// Runs: git merge-base --fork-point <branch>
func gitMergeBase(path string, branch string) (string, error) {
sha, err := gitLatestCommitSha(path)
if err != nil {
return sha, trace.Wrap(err)
}
ref, err := git(path, "merge-base", branch, sha)
if err != nil {
return ref, trace.Errorf("%w : Error returned by `git merge-base %s %s`: %s", err, branch, sha, ref)
}
return ref, nil
}
// gitChanges returns git diff with a ref of fork point with base branch
//
// Runs: git diff $(git merge-base --fork-point <branch>)
func gitChanges(path string, ref string) (string, error) {
diff, err := git(path, "diff", ref, "--", path)
if err != nil {
return diff, trace.Errorf("%w : Error returned by `git diff %s`: %s", err, ref, diff)
}
return diff, nil
}
// gitGetFileFromRevision returns file contents from revision
//
// Runs: git show -b <ref>:<filename>
func gitGetFileFromRevision(path string, filename string, ref string) (string, error) {
// -b means skip spaces
content, err := git(path, "show", "-b", ref+":"+filename)
if err != nil {
// file does not exists in revision
if strings.Contains(content, gitFileNotExistsError) {
return "", nil
}
return content, trace.Errorf("%w : Error returned by `git show %s:%s : %s", err, ref, filename, content)
}
return content, nil
}