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package main
import (
"bytes"
"errors"
"fmt"
"io"
"os/exec"
"strconv"
"time"
"os"
)
type GitDir string
func (dir GitDir) cmd(args ...string) *exec.Cmd {
cmd := exec.Command(args[0], args[1:]...)
cmd.Dir = string(dir)
return cmd
}
func (dir GitDir) output(args ...string) ([]byte, error) {
return dir.cmd(args...).Output()
}
func (dir GitDir) run(args ...string) error {
// Use .Output() instead of .Run() so that it populates
// ExitError.Stderr.
_, err := dir.output(args...)
return err
}
func (dir GitDir) Pull() error {
return dir.run("git", "fetch")
}
func (dir GitDir) Push() error {
return dir.run("git", "push")
}
func (dir GitDir) Commit(commit GitCommit) error {
cmd := dir.cmd("git", "fast-import", "--done")
// stdin
pw, err := cmd.StdinPipe()
if err != nil {
return err
}
// stderr
var buf bytes.Buffer
cmd.Stderr = &buf
// run
if err = cmd.Start(); err != nil {
return err
}
werr := commit.FastExport(pw)
if werr != nil { goto end; }
_, werr = io.WriteString(pw, "done\n")
if werr != nil { goto end; }
end:
cerr := pw.Close()
if err = cmd.Wait(); err != nil {
if ee, ok := err.(*exec.ExitError); ok {
ee.Stderr = buf.Bytes()
}
} else if werr != nil {
err = werr
} else {
err = cerr
}
return err
}
type GitCommit struct {
UserName string
UserEmail string
Time time.Time
Message string
Files map[string][]byte
}
func gitTime(t time.Time) string {
return fmt.Sprintf("%d %s", t.Unix(), t.Format("-0700"))
}
func (edit GitCommit) FastExport(w io.Writer) error {
var err error
commit := make([]string, len(edit.Files))
i := 0
for name, content := range edit.Files {
commit[i] = name
if content != nil {
if _, err = fmt.Fprintf(w, "blob\nmark :%d\ndata %d\n%s", i+1, len(content), content); err != nil {
return err
}
}
}
_, err = fmt.Fprintf(w, `commit refs/heads/master
author %s <%s> %s
committer %s <%s> %s
data %d
%sfrom HEAD
`,
edit.UserName, edit.UserEmail, gitTime(edit.Time),
edit.UserName, edit.UserEmail, gitTime(edit.Time),
len(edit.Message), edit.Message)
if err != nil {
return err
}
for i, filename := range commit {
if edit.Files[filename] != nil {
if _, err = fmt.Fprintf(w, "M 100644 :%d %s\n", i+1, filename); err != nil {
return err
}
} else {
if _, err = fmt.Fprintf(w, "D %s\n", filename); err != nil {
return err
}
}
}
return nil
}
type GitFile struct {
Dir GitDir
Mode int32 // 18 bits unsigned
Type string
Hash string
Size int64
}
func (f GitFile) Cat() ([]byte, error) {
return f.Dir.output("git", "cat-file", "blob", f.Hash)
}
type GitTree map[string]GitFile
var (
ParseErrorSpaces = errors.New("parse: git ls-tree: not enough spaces")
ParseErrorTab = errors.New("parse: git ls-tree: no tab")
ParseErrorNull = errors.New("parse: git ls-tree: no trailing null")
)
func parseGitTreeLine(line []byte) (rname string, rfile GitFile, err error) {
// There is probably a better, shorter way of doing this
// line = mode SP type SP hash SP size TAB name
a := bytes.SplitN(line, []byte{' '}, 4)
if len(a) != 4 {
err = ParseErrorSpaces
return
}
b := bytes.SplitN(a[3], []byte{'\t'}, 2)
if len(b) != 2 {
err = ParseErrorTab
return
}
fmode := a[0]
ftype := a[1]
fhash := a[2]
fsize := b[0]
fname := b[1]
// convert datatypes
fmodeN, err := strconv.ParseInt(string(fmode), 10, 19)
if err != nil {
return
}
fsizeN := int64(-1)
fsizeS := string(bytes.TrimLeft(fsize, " "))
if fsizeS != "-" {
fsizeN, err = strconv.ParseInt(fsizeS, 10, 64)
if err != nil {
return
}
}
rname = string(fname)
rfile = GitFile{
Mode: int32(fmodeN),
Type: string(ftype),
Hash: string(fhash),
Size: fsizeN,
}
return
}
func (dir GitDir) LsTree() (GitTree, error) {
// Get the root tree-ish
data, err := dir.output("git", "rev-parse", "HEAD:")
if err != nil {
return nil, err
}
treeish := string(bytes.TrimSuffix(data, []byte{'\n'}))
// Recursively read said tree-ish
data, err = dir.output("git", "ls-tree", "-trlz", treeish)
if err != nil {
return nil, err
}
lines := bytes.Split(data, []byte{0})
// The last line is empty line so se can ignore it
// (`len(lines)-1`), but because it doesn't include a line for
// the root tree, we have to +1.
ret := make(GitTree, len(lines))
// Add the root tree
ret["/"] = GitFile{
Mode: int32(40000),
Type: "tree",
Hash: treeish,
Size: -1,
}
// Parse the lines from git ls-tree
for _, line := range lines {
if len(line) == 0 {
continue
}
name, file, err := parseGitTreeLine(line)
if err != nil {
panic(err)
return nil, err
}
file.Dir = dir
ret["/"+name] = file
}
return ret, nil
}
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