mirror of
https://github.com/gravitational/teleport.git
synced 2026-11-02 06:08:23 +08:00
Jakub NyckowskiandVictor Sokolov
cbb556a05e
Signed-off-by: Jakub Nyckowski <jakub.nyckowski@goteleport.com> Co-authored-by: Victor Sokolov <gzigzigzeo@gmail.com>
115 lines
3.0 KiB
Go
115 lines
3.0 KiB
Go
/*
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Copyright 2022 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"bytes"
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"os/exec"
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"strings"
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"github.com/gravitational/trace"
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)
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const (
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// gitFileNotExistsError is error message returned from git when the file
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// does not exists in this revision
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gitFileNotExistsError = "exists on disk, but not in"
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)
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// gitIsAvailable returns status of git
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func gitIsAvailable() error {
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_, err := exec.LookPath("git")
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return err
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}
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// git runs git and returns output (stdout/stderr, depends on the cmd result) and error
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func git(dir string, args ...string) (string, error) {
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var stdout bytes.Buffer
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var stderr bytes.Buffer
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cmd := exec.Command("git", args...)
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cmd.Stdout = &stdout
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cmd.Stderr = &stderr
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cmd.Dir = dir
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err := cmd.Run()
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if err != nil {
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return strings.TrimSpace(stderr.String()), trace.Wrap(err)
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}
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return strings.TrimSpace(stdout.String()), nil
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}
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// gitLatestCommit returns sha of the latest commit
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//
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// Runs: git log -1 --format=%H
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func gitLatestCommitSha(path string) (string, error) {
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sha, err := git(path, "log", "--pretty=oneline", "-1", "--format=%H")
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if err != nil {
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return sha, trace.Errorf("%w : Error returned by `git log -1 --format=%%H", err)
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}
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return sha, nil
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}
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// gitMergeBase returns git ref of fork point
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//
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// Runs: git merge-base --fork-point <branch>
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func gitMergeBase(path string, branch string) (string, error) {
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sha, err := gitLatestCommitSha(path)
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if err != nil {
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return sha, trace.Wrap(err)
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}
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ref, err := git(path, "merge-base", branch, sha)
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if err != nil {
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return ref, trace.Errorf("%w : Error returned by `git merge-base %s %s`: %s", err, branch, sha, ref)
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}
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return ref, nil
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}
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// gitChanges returns git diff with a ref of fork point with base branch
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//
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// Runs: git diff $(git merge-base --fork-point <branch>)
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func gitChanges(path string, ref string) (string, error) {
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diff, err := git(path, "diff", ref, "--", path)
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if err != nil {
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return diff, trace.Errorf("%w : Error returned by `git diff %s`: %s", err, ref, diff)
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}
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return diff, nil
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}
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// gitGetFileFromRevision returns file contents from revision
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//
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// Runs: git show -b <ref>:<filename>
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func gitGetFileFromRevision(path string, filename string, ref string) (string, error) {
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// -b means skip spaces
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content, err := git(path, "show", "-b", ref+":"+filename)
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if err != nil {
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// file does not exists in revision
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if strings.Contains(content, gitFileNotExistsError) {
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return "", nil
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}
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return content, trace.Errorf("%w : Error returned by `git show %s:%s : %s", err, ref, filename, content)
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}
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return content, nil
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}
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