732 lines
21 KiB
Go
732 lines
21 KiB
Go
// Package git contains various commands that shell out to git
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package git
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"sync"
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"syscall"
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"time"
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"github.com/github/git-lfs/vendor/_nuts/github.com/kr/pty"
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"github.com/github/git-lfs/vendor/_nuts/github.com/rubyist/tracerx"
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)
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type RefType int
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const (
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RefTypeLocalBranch = RefType(iota)
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RefTypeRemoteBranch = RefType(iota)
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RefTypeLocalTag = RefType(iota)
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RefTypeRemoteTag = RefType(iota)
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RefTypeHEAD = RefType(iota) // current checkout
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RefTypeOther = RefType(iota) // stash or unknown
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)
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// A git reference (branch, tag etc)
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type Ref struct {
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Name string
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Type RefType
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Sha string
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}
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// Some top level information about a commit (only first line of message)
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type CommitSummary struct {
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Sha string
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ShortSha string
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Parents []string
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CommitDate time.Time
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AuthorDate time.Time
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AuthorName string
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AuthorEmail string
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CommitterName string
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CommitterEmail string
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Subject string
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}
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func LsRemote(remote, remoteRef string) (string, error) {
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if remote == "" {
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return "", errors.New("remote required")
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}
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if remoteRef == "" {
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return simpleExec("git", "ls-remote", remote)
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}
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return simpleExec("git", "ls-remote", remote, remoteRef)
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}
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func ResolveRef(ref string) (*Ref, error) {
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outp, err := simpleExec("git", "rev-parse", ref, "--symbolic-full-name", ref)
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if err != nil {
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return nil, err
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}
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lines := strings.Split(outp, "\n")
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if len(lines) <= 1 {
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return nil, fmt.Errorf("Git can't resolve ref: %q", ref)
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}
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fullref := &Ref{Sha: lines[0]}
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fullref.Type, fullref.Name = ParseRefToTypeAndName(lines[1])
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return fullref, nil
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}
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func CurrentRef() (*Ref, error) {
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return ResolveRef("HEAD")
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}
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func CurrentRemoteRef() (*Ref, error) {
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remoteref, err := RemoteRefNameForCurrentBranch()
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if err != nil {
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return nil, err
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}
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return ResolveRef(remoteref)
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}
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// RemoteForCurrentBranch returns the name of the remote that the current branch is tracking
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func RemoteForCurrentBranch() (string, error) {
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ref, err := CurrentRef()
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if err != nil {
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return "", err
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}
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remote := RemoteForBranch(ref.Name)
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if remote == "" {
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return "", fmt.Errorf("remote not found for branch %q", ref.Name)
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}
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return remote, nil
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}
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// RemoteRefForCurrentBranch returns the full remote ref (remote/remotebranch) that the current branch is tracking
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func RemoteRefNameForCurrentBranch() (string, error) {
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ref, err := CurrentRef()
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if err != nil {
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return "", err
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}
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if ref.Type == RefTypeHEAD || ref.Type == RefTypeOther {
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return "", errors.New("not on a branch")
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}
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remote := RemoteForBranch(ref.Name)
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if remote == "" {
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return "", fmt.Errorf("remote not found for branch %q", ref.Name)
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}
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remotebranch := RemoteBranchForLocalBranch(ref.Name)
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return remote + "/" + remotebranch, nil
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}
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// RemoteForBranch returns the remote name that a given local branch is tracking (blank if none)
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func RemoteForBranch(localBranch string) string {
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return Config.Find(fmt.Sprintf("branch.%s.remote", localBranch))
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}
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// RemoteBranchForLocalBranch returns the name (only) of the remote branch that the local branch is tracking
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// If no specific branch is configured, returns local branch name
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func RemoteBranchForLocalBranch(localBranch string) string {
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// get remote ref to track, may not be same name
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merge := Config.Find(fmt.Sprintf("branch.%s.merge", localBranch))
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if strings.HasPrefix(merge, "refs/heads/") {
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return merge[11:]
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} else {
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return localBranch
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}
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}
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func RemoteList() ([]string, error) {
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cmd := execCommand("git", "remote")
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outp, err := cmd.StdoutPipe()
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if err != nil {
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return nil, fmt.Errorf("Failed to call git remote: %v", err)
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}
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cmd.Start()
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scanner := bufio.NewScanner(outp)
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var ret []string
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for scanner.Scan() {
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ret = append(ret, strings.TrimSpace(scanner.Text()))
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}
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return ret, nil
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}
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// ValidateRemote checks that a named remote is valid for use
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// Mainly to check user-supplied remotes & fail more nicely
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func ValidateRemote(remote string) error {
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remotes, err := RemoteList()
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if err != nil {
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return err
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}
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for _, r := range remotes {
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if r == remote {
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return nil
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}
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}
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return errors.New("Invalid remote name")
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}
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// DefaultRemote returns the default remote based on:
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// 1. The currently tracked remote branch, if present
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// 2. "origin", if defined
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// 3. Any other SINGLE remote defined in .git/config
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// Returns an error if all of these fail, i.e. no tracked remote branch, no
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// "origin", and either no remotes defined or 2+ non-"origin" remotes
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func DefaultRemote() (string, error) {
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tracked, err := RemoteForCurrentBranch()
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if err == nil {
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return tracked, nil
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}
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// Otherwise, check what remotes are defined
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remotes, err := RemoteList()
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if err != nil {
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return "", err
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}
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switch len(remotes) {
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case 0:
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return "", errors.New("No remotes defined")
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case 1: // always use a single remote whether it's origin or otherwise
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return remotes[0], nil
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default:
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for _, remote := range remotes {
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// Use origin if present
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if remote == "origin" {
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return remote, nil
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}
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}
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}
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return "", errors.New("Unable to pick default remote, too ambiguous")
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}
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func UpdateIndex(file string) error {
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_, err := simpleExec("git", "update-index", "-q", "--refresh", file)
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return err
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}
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type gitConfig struct {
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}
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var Config = &gitConfig{}
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// Find returns the git config value for the key
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func (c *gitConfig) Find(val string) string {
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output, _ := simpleExec("git", "config", val)
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return output
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}
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// Find returns the git config value for the key
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func (c *gitConfig) FindGlobal(val string) string {
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output, _ := simpleExec("git", "config", "--global", val)
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return output
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}
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// Find returns the git config value for the key
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func (c *gitConfig) FindLocal(val string) string {
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output, _ := simpleExec("git", "config", "--local", val)
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return output
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}
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// SetGlobal sets the git config value for the key in the global config
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func (c *gitConfig) SetGlobal(key, val string) {
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simpleExec("git", "config", "--global", key, val)
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}
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// UnsetGlobal removes the git config value for the key from the global config
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func (c *gitConfig) UnsetGlobal(key string) {
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simpleExec("git", "config", "--global", "--unset", key)
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}
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func (c *gitConfig) UnsetGlobalSection(key string) {
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simpleExec("git", "config", "--global", "--remove-section", key)
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}
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// SetLocal sets the git config value for the key in the specified config file
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func (c *gitConfig) SetLocal(file, key, val string) {
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args := make([]string, 1, 5)
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args[0] = "config"
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if len(file) > 0 {
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args = append(args, "--file", file)
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}
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args = append(args, key, val)
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simpleExec("git", args...)
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}
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// UnsetLocalKey removes the git config value for the key from the specified config file
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func (c *gitConfig) UnsetLocalKey(file, key string) {
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args := make([]string, 1, 5)
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args[0] = "config"
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if len(file) > 0 {
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args = append(args, "--file", file)
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}
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args = append(args, "--unset", key)
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simpleExec("git", args...)
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}
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// List lists all of the git config values
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func (c *gitConfig) List() (string, error) {
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return simpleExec("git", "config", "-l")
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}
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// ListFromFile lists all of the git config values in the given config file
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func (c *gitConfig) ListFromFile(f string) (string, error) {
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return simpleExec("git", "config", "-l", "-f", f)
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}
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// Version returns the git version
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func (c *gitConfig) Version() (string, error) {
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return simpleExec("git", "version")
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}
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// IsVersionAtLeast returns whether the git version is the one specified or higher
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// argument is plain version string separated by '.' e.g. "2.3.1" but can omit minor/patch
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func (c *gitConfig) IsGitVersionAtLeast(ver string) bool {
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gitver, err := c.Version()
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if err != nil {
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tracerx.Printf("Error getting git version: %v", err)
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return false
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}
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return IsVersionAtLeast(gitver, ver)
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}
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// simpleExec is a small wrapper around os/exec.Command.
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func simpleExec(name string, args ...string) (string, error) {
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tracerx.Printf("run_command: '%s' %s", name, strings.Join(args, " "))
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cmd := execCommand(name, args...)
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output, err := cmd.Output()
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if _, ok := err.(*exec.ExitError); ok {
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return "", nil
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}
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if err != nil {
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return fmt.Sprintf("Error running %s %s", name, args), err
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}
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return strings.Trim(string(output), " \n"), nil
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}
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// RecentBranches returns branches with commit dates on or after the given date/time
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// Return full Ref type for easier detection of duplicate SHAs etc
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// since: refs with commits on or after this date will be included
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// includeRemoteBranches: true to include refs on remote branches
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// onlyRemote: set to non-blank to only include remote branches on a single remote
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func RecentBranches(since time.Time, includeRemoteBranches bool, onlyRemote string) ([]*Ref, error) {
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cmd := execCommand("git", "for-each-ref",
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`--sort=-committerdate`,
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`--format=%(refname) %(objectname) %(committerdate:iso)`,
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"refs")
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outp, err := cmd.StdoutPipe()
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if err != nil {
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return nil, fmt.Errorf("Failed to call git for-each-ref: %v", err)
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}
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cmd.Start()
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scanner := bufio.NewScanner(outp)
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// Output is like this:
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// refs/heads/master f03686b324b29ff480591745dbfbbfa5e5ac1bd5 2015-08-19 16:50:37 +0100
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// refs/remotes/origin/master ad3b29b773e46ad6870fdf08796c33d97190fe93 2015-08-13 16:50:37 +0100
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// Output is ordered by latest commit date first, so we can stop at the threshold
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regex := regexp.MustCompile(`^(refs/[^/]+/\S+)\s+([0-9A-Za-z]{40})\s+(\d{4}-\d{2}-\d{2}\s+\d{2}\:\d{2}\:\d{2}\s+[\+\-]\d{4})`)
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tracerx.Printf("RECENT: Getting refs >= %v", since)
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var ret []*Ref
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for scanner.Scan() {
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line := scanner.Text()
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if match := regex.FindStringSubmatch(line); match != nil {
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fullref := match[1]
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sha := match[2]
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reftype, ref := ParseRefToTypeAndName(fullref)
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if reftype == RefTypeRemoteBranch || reftype == RefTypeRemoteTag {
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if !includeRemoteBranches {
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continue
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}
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if onlyRemote != "" && !strings.HasPrefix(ref, onlyRemote+"/") {
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continue
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}
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}
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// This is a ref we might use
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// Check the date
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commitDate, err := ParseGitDate(match[3])
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if err != nil {
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return ret, err
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}
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if commitDate.Before(since) {
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// the end
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break
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}
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tracerx.Printf("RECENT: %v (%v)", ref, commitDate)
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ret = append(ret, &Ref{ref, reftype, sha})
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}
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}
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cmd.Wait()
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return ret, nil
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}
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// Get the type & name of a git reference
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func ParseRefToTypeAndName(fullref string) (t RefType, name string) {
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const localPrefix = "refs/heads/"
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const remotePrefix = "refs/remotes/"
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const remoteTagPrefix = "refs/remotes/tags/"
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const localTagPrefix = "refs/tags/"
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if fullref == "HEAD" {
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name = fullref
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t = RefTypeHEAD
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} else if strings.HasPrefix(fullref, localPrefix) {
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name = fullref[len(localPrefix):]
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t = RefTypeLocalBranch
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} else if strings.HasPrefix(fullref, remotePrefix) {
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name = fullref[len(remotePrefix):]
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t = RefTypeRemoteBranch
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} else if strings.HasPrefix(fullref, remoteTagPrefix) {
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name = fullref[len(remoteTagPrefix):]
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t = RefTypeRemoteTag
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} else if strings.HasPrefix(fullref, localTagPrefix) {
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name = fullref[len(localTagPrefix):]
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t = RefTypeLocalTag
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} else {
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name = fullref
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t = RefTypeOther
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}
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return
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}
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// Parse a Git date formatted in ISO 8601 format (%ci/%ai)
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func ParseGitDate(str string) (time.Time, error) {
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// Unfortunately Go and Git don't overlap in their builtin date formats
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// Go's time.RFC1123Z and Git's %cD are ALMOST the same, except that
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// when the day is < 10 Git outputs a single digit, but Go expects a leading
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// zero - this is enough to break the parsing. Sigh.
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// Format is for 2 Jan 2006, 15:04:05 -7 UTC as per Go
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return time.Parse("2006-01-02 15:04:05 -0700", str)
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}
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// FormatGitDate converts a Go date into a git command line format date
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func FormatGitDate(tm time.Time) string {
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// Git format is "Fri Jun 21 20:26:41 2013 +0900" but no zero-leading for day
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return tm.Format("Mon Jan 2 15:04:05 2006 -0700")
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}
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// Get summary information about a commit
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func GetCommitSummary(commit string) (*CommitSummary, error) {
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cmd := execCommand("git", "show", "-s",
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`--format=%H|%h|%P|%ai|%ci|%ae|%an|%ce|%cn|%s`, commit)
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out, err := cmd.CombinedOutput()
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if err != nil {
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return nil, fmt.Errorf("Failed to call git show: %v %v", err, string(out))
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}
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// At most 10 substrings so subject line is not split on anything
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fields := strings.SplitN(string(out), "|", 10)
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// Cope with the case where subject is blank
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if len(fields) >= 9 {
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ret := &CommitSummary{}
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// Get SHAs from output, not commit input, so we can support symbolic refs
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ret.Sha = fields[0]
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ret.ShortSha = fields[1]
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ret.Parents = strings.Split(fields[2], " ")
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// %aD & %cD (RFC2822) matches Go's RFC1123Z format
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ret.AuthorDate, _ = ParseGitDate(fields[3])
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ret.CommitDate, _ = ParseGitDate(fields[4])
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ret.AuthorEmail = fields[5]
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ret.AuthorName = fields[6]
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ret.CommitterEmail = fields[7]
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ret.CommitterName = fields[8]
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if len(fields) > 9 {
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ret.Subject = strings.TrimRight(fields[9], "\n")
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}
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return ret, nil
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} else {
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msg := fmt.Sprintf("Unexpected output from git show: %v", string(out))
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return nil, errors.New(msg)
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}
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}
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func GitAndRootDirs() (string, string, error) {
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cmd := execCommand("git", "rev-parse", "--git-dir", "--show-toplevel")
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buf := &bytes.Buffer{}
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cmd.Stderr = buf
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out, err := cmd.Output()
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output := string(out)
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if err != nil {
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return "", "", fmt.Errorf("Failed to call git rev-parse --git-dir --show-toplevel: %q", buf.String())
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}
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paths := strings.Split(output, "\n")
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pathLen := len(paths)
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if pathLen == 0 {
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return "", "", fmt.Errorf("Bad git rev-parse output: %q", output)
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}
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absGitDir, err := filepath.Abs(paths[0])
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if err != nil {
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return "", "", fmt.Errorf("Error converting %q to absolute: %s", paths[0], err)
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}
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if pathLen == 1 || len(paths[1]) == 0 {
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return absGitDir, "", nil
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}
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absRootDir, err := filepath.Abs(paths[1])
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if err != nil {
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return "", "", fmt.Errorf("Error converting %q to absolute: %s", paths[1], err)
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}
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return absGitDir, absRootDir, nil
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}
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func RootDir() (string, error) {
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cmd := execCommand("git", "rev-parse", "--show-toplevel")
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out, err := cmd.Output()
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if err != nil {
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return "", fmt.Errorf("Failed to call git rev-parse --show-toplevel: %v %v", err, string(out))
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}
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path := strings.TrimSpace(string(out))
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if len(path) > 0 {
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return filepath.Abs(path)
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}
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return "", nil
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}
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func GitDir() (string, error) {
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cmd := execCommand("git", "rev-parse", "--git-dir")
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out, err := cmd.Output()
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if err != nil {
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return "", fmt.Errorf("Failed to call git rev-parse --git-dir: %v %v", err, string(out))
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}
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path := strings.TrimSpace(string(out))
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if len(path) > 0 {
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return filepath.Abs(path)
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}
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return "", nil
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}
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|
|
|
// GetAllWorkTreeHEADs returns the refs that all worktrees are using as HEADs
|
|
// This returns all worktrees plus the master working copy, and works even if
|
|
// working dir is actually in a worktree right now
|
|
// Pass in the git storage dir (parent of 'objects') to work from
|
|
func GetAllWorkTreeHEADs(storageDir string) ([]*Ref, error) {
|
|
worktreesdir := filepath.Join(storageDir, "worktrees")
|
|
dirf, err := os.Open(worktreesdir)
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return nil, err
|
|
}
|
|
|
|
var worktrees []*Ref
|
|
if err == nil {
|
|
// There are some worktrees
|
|
defer dirf.Close()
|
|
direntries, err := dirf.Readdir(0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, dirfi := range direntries {
|
|
if dirfi.IsDir() {
|
|
// to avoid having to chdir and run git commands to identify the commit
|
|
// just read the HEAD file & git rev-parse if necessary
|
|
// Since the git repo is shared the same rev-parse will work from this location
|
|
headfile := filepath.Join(worktreesdir, dirfi.Name(), "HEAD")
|
|
ref, err := parseRefFile(headfile)
|
|
if err != nil {
|
|
tracerx.Printf("Error reading %v for worktree, skipping: %v", headfile, err)
|
|
continue
|
|
}
|
|
worktrees = append(worktrees, ref)
|
|
}
|
|
}
|
|
}
|
|
|
|
// This has only established the separate worktrees, not the original checkout
|
|
// If the storageDir contains a HEAD file then there is a main checkout
|
|
// as well; this mus tbe resolveable whether you're in the main checkout or
|
|
// a worktree
|
|
headfile := filepath.Join(storageDir, "HEAD")
|
|
ref, err := parseRefFile(headfile)
|
|
if err == nil {
|
|
worktrees = append(worktrees, ref)
|
|
} else if !os.IsNotExist(err) { // ok if not exists, probably bare repo
|
|
tracerx.Printf("Error reading %v for main checkout, skipping: %v", headfile, err)
|
|
}
|
|
|
|
return worktrees, nil
|
|
}
|
|
|
|
// Manually parse a reference file like HEAD and return the Ref it resolves to
|
|
func parseRefFile(filename string) (*Ref, error) {
|
|
bytes, err := ioutil.ReadFile(filename)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
contents := strings.TrimSpace(string(bytes))
|
|
if strings.HasPrefix(contents, "ref:") {
|
|
contents = strings.TrimSpace(contents[4:])
|
|
}
|
|
return ResolveRef(contents)
|
|
}
|
|
|
|
// IsVersionAtLeast compares 2 version strings (ok to be prefixed with 'git version', ignores)
|
|
func IsVersionAtLeast(actualVersion, desiredVersion string) bool {
|
|
// Capture 1-3 version digits, optionally prefixed with 'git version' and possibly
|
|
// with suffixes which we'll ignore (e.g. unstable builds, MinGW versions)
|
|
verregex := regexp.MustCompile(`(?:git version\s+)?(\d+)(?:.(\d+))?(?:.(\d+))?.*`)
|
|
|
|
var atleast uint64
|
|
// Support up to 1000 in major/minor/patch digits
|
|
const majorscale = 1000 * 1000
|
|
const minorscale = 1000
|
|
|
|
if match := verregex.FindStringSubmatch(desiredVersion); match != nil {
|
|
// Ignore errors as regex won't match anything other than digits
|
|
major, _ := strconv.Atoi(match[1])
|
|
atleast += uint64(major * majorscale)
|
|
if len(match) > 2 {
|
|
minor, _ := strconv.Atoi(match[2])
|
|
atleast += uint64(minor * minorscale)
|
|
}
|
|
if len(match) > 3 {
|
|
patch, _ := strconv.Atoi(match[3])
|
|
atleast += uint64(patch)
|
|
}
|
|
}
|
|
|
|
var actual uint64
|
|
if match := verregex.FindStringSubmatch(actualVersion); match != nil {
|
|
major, _ := strconv.Atoi(match[1])
|
|
actual += uint64(major * majorscale)
|
|
if len(match) > 2 {
|
|
minor, _ := strconv.Atoi(match[2])
|
|
actual += uint64(minor * minorscale)
|
|
}
|
|
if len(match) > 3 {
|
|
patch, _ := strconv.Atoi(match[3])
|
|
actual += uint64(patch)
|
|
}
|
|
}
|
|
|
|
return actual >= atleast
|
|
}
|
|
|
|
// CloneWithoutFilters clones a git repo but without the smudge filter enabled
|
|
// so that files in the working copy will be pointers and not real LFS data
|
|
func CloneWithoutFilters(args []string) error {
|
|
|
|
// Before git 2.2, setting filters to blank fails, so use cat instead (slightly slower)
|
|
filterOverride := ""
|
|
if !Config.IsGitVersionAtLeast("2.2.0") {
|
|
filterOverride = "cat"
|
|
}
|
|
// Disable the LFS filters while cloning to speed things up
|
|
// this is especially effective on Windows where even calling git-lfs at all
|
|
// with --skip-smudge is costly across many files in a checkout
|
|
cmdargs := []string{
|
|
"-c", fmt.Sprintf("filter.lfs.smudge=%v", filterOverride),
|
|
"-c", "filter.lfs.required=false",
|
|
"clone"}
|
|
cmdargs = append(cmdargs, args...)
|
|
cmd := execCommand("git", cmdargs...)
|
|
|
|
// Spool stdout directly to our own
|
|
cmd.Stdout = os.Stdout
|
|
|
|
// Assign pty/tty so git thinks it's a real terminal
|
|
outpty, outtty, err := pty.Open()
|
|
cmd.Stdin = outtty
|
|
cmd.Stdout = outtty
|
|
errpty, errtty, err := pty.Open()
|
|
// stderr needs filtering
|
|
cmd.Stderr = errtty
|
|
if cmd.SysProcAttr == nil {
|
|
cmd.SysProcAttr = &syscall.SysProcAttr{}
|
|
}
|
|
cmd.SysProcAttr.Setctty = true
|
|
cmd.SysProcAttr.Setsid = true
|
|
|
|
var outputWait sync.WaitGroup
|
|
outputWait.Add(2)
|
|
go func() {
|
|
io.Copy(os.Stdout, outpty)
|
|
outputWait.Done()
|
|
}()
|
|
go func() {
|
|
// Filter stderr to exclude messages caused by disabling the filters
|
|
// As of git 2.7 it still tries to call the blank filter but required=false
|
|
// this problem should be gone in git 2.8 https://github.com/git/git/commit/1a8630d
|
|
scanner := bufio.NewScanner(errpty)
|
|
for scanner.Scan() {
|
|
s := scanner.Text()
|
|
|
|
// Swallow all the known messages from intentionally breaking filter
|
|
if strings.Contains(s, "error: external filter") ||
|
|
strings.Contains(s, "error: cannot fork") ||
|
|
// Linux / Mac messages
|
|
strings.Contains(s, "error: cannot run : No such file or directory") ||
|
|
strings.Contains(s, "warning: Clone succeeded, but checkout failed") ||
|
|
strings.Contains(s, "You can inspect what was checked out with 'git status'") ||
|
|
strings.Contains(s, "retry the checkout") ||
|
|
// Windows messages
|
|
strings.Contains(s, "error: cannot spawn : No such file or directory") ||
|
|
// blank formatting
|
|
len(strings.TrimSpace(s)) == 0 {
|
|
// Send filtered stderr to trace in case useful
|
|
tracerx.Printf(s)
|
|
continue
|
|
}
|
|
os.Stderr.WriteString(s)
|
|
os.Stderr.WriteString("\n") // stripped by scanner
|
|
}
|
|
outputWait.Done()
|
|
}()
|
|
|
|
err = cmd.Start()
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to start git clone: %v", err)
|
|
}
|
|
|
|
outtty.Close()
|
|
errtty.Close()
|
|
|
|
err = cmd.Wait()
|
|
outputWait.Wait()
|
|
if err != nil {
|
|
return fmt.Errorf("git clone failed: %v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// An env for an exec.Command without GIT_TRACE
|
|
var env []string
|
|
var traceEnv = "GIT_TRACE="
|
|
|
|
func init() {
|
|
realEnv := os.Environ()
|
|
env = make([]string, 0, len(realEnv))
|
|
|
|
for _, kv := range realEnv {
|
|
if strings.HasPrefix(kv, traceEnv) {
|
|
continue
|
|
}
|
|
env = append(env, kv)
|
|
}
|
|
}
|