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package git
import (
"fmt"
"os"
"os/exec"
"strings"
version "github.com/hashicorp/go-version"
"github.com/sirupsen/logrus"
)
// Commits returns a set of commits.
// If commitrange is a git still range 12345...54321, then it will be isolated set of commits.
// If commitrange is a single commit, all ancestor commits up through the hash provided.
// If commitrange is an empty commit range, then nil is returned.
func Commits(commitrange string) ([]CommitEntry, error) {
cmdArgs := []string{"git", "--no-pager", "log", `--pretty=format:%H`, commitrange}
if debug() {
logrus.Infof("[git] cmd: %q", strings.Join(cmdArgs, " "))
}
output, err := exec.Command(cmdArgs[0], cmdArgs[1:]...).Output()
if err != nil {
logrus.Errorf("mm[git] cmd: %q", strings.Join(cmdArgs, " "))
return nil, err
}
if len(output) == 0 {
return nil, nil
}
commitHashes := strings.Split(strings.TrimSpace(string(output)), "\n")
commits := make([]CommitEntry, len(commitHashes))
for i, commitHash := range commitHashes {
c, err := LogCommit(commitHash)
if err != nil {
return commits, err
}
commits[i] = *c
}
return commits, nil
}
// FieldNames are for the formating and rendering of the CommitEntry structs.
// Keys here are from git log pretty format "format:..."
var FieldNames = map[string]string{
"%h": "abbreviated_commit",
"%p": "abbreviated_parent",
"%t": "abbreviated_tree",
"%aD": "author_date",
"%aE": "author_email",
"%aN": "author_name",
"%b": "body",
"%H": "commit",
"%N": "commit_notes",
"%cD": "committer_date",
"%cE": "committer_email",
"%cN": "committer_name",
"%e": "encoding",
"%P": "parent",
"%D": "refs",
"%f": "sanitized_subject_line",
"%GS": "signer",
"%GK": "signer_key",
"%s": "subject",
"%G?": "verification_flag",
}
func gitVersion() (string, error) {
cmd := exec.Command("git", "version")
cmd.Stderr = os.Stderr
buf, err := cmd.Output()
if err != nil {
return "", err
}
return strings.Fields(string(buf))[2], nil
}
// https://github.com/vbatts/git-validation/issues/37
var versionWithExcludes = "1.9.5"
func gitVersionNewerThan(otherV string) (bool, error) {
gv, err := gitVersion()
if err != nil {
return false, err
}
v1, err := version.NewVersion(gv)
if err != nil {
return false, err
}
v2, err := version.NewVersion(otherV)
if err != nil {
return false, err
}
return v2.Equal(v1) || v2.LessThan(v1), nil
}
// Check warns if changes introduce whitespace errors.
// Returns non-zero if any issues are found.
func Check(commit string) ([]byte, error) {
args := []string{
"--no-pager", "log", "--check",
fmt.Sprintf("%s^..%s", commit, commit),
}
if excludeEnvList := os.Getenv("GIT_CHECK_EXCLUDE"); excludeEnvList != "" {
gitNewEnough, err := gitVersionNewerThan(versionWithExcludes)
if err != nil {
return nil, err
}
if gitNewEnough {
excludeList := strings.Split(excludeEnvList, ":")
for _, exclude := range excludeList {
if exclude == "" {
continue
}
args = append(args, "--", ".", fmt.Sprintf(":(exclude)%s", exclude))
}
}
}
cmd := exec.Command("git", args...)
if debug() {
logrus.Infof("[git] cmd: %q", strings.Join(cmd.Args, " "))
}
cmd.Stderr = os.Stderr
return cmd.Output()
}
// Show returns the diff of a commit.
//
// NOTE: This could be expensive for very large commits.
func Show(commit string) ([]byte, error) {
cmd := exec.Command("git", "--no-pager", "show", commit)
if debug() {
logrus.Infof("[git] cmd: %q", strings.Join(cmd.Args, " "))
}
cmd.Stderr = os.Stderr
return cmd.Output()
}
// CommitEntry represents a single commit's information from `git`.
// See also FieldNames
type CommitEntry map[string]string
// LogCommit assembles the full information on a commit from its commit hash
func LogCommit(commit string) (*CommitEntry, error) {
c := CommitEntry{}
for k, v := range FieldNames {
cmd := exec.Command("git", "--no-pager", "log", "-1", `--pretty=format:`+k+``, commit)
if debug() {
logrus.Infof("[git] cmd: %q", strings.Join(cmd.Args, " "))
}
cmd.Stderr = os.Stderr
out, err := cmd.Output()
if err != nil {
logrus.Errorf("[git] cmd: %q", strings.Join(cmd.Args, " "))
return nil, err
}
c[v] = strings.TrimSpace(string(out))
}
return &c, nil
}
func debug() bool {
return len(os.Getenv("DEBUG")) > 0
}
// FetchHeadCommit returns the hash of FETCH_HEAD
func FetchHeadCommit() (string, error) {
cmdArgs := []string{"git", "--no-pager", "rev-parse", "--verify", "FETCH_HEAD"}
if debug() {
logrus.Infof("[git] cmd: %q", strings.Join(cmdArgs, " "))
}
output, err := exec.Command(cmdArgs[0], cmdArgs[1:]...).Output()
if err != nil {
logrus.Errorf("[git] cmd: %q", strings.Join(cmdArgs, " "))
return "", err
}
return strings.TrimSpace(string(output)), nil
}
// HeadCommit returns the hash of HEAD
func HeadCommit() (string, error) {
cmdArgs := []string{"git", "--no-pager", "rev-parse", "--verify", "HEAD"}
if debug() {
logrus.Infof("[git] cmd: %q", strings.Join(cmdArgs, " "))
}
output, err := exec.Command(cmdArgs[0], cmdArgs[1:]...).Output()
if err != nil {
logrus.Errorf("[git] cmd: %q", strings.Join(cmdArgs, " "))
return "", err
}
return strings.TrimSpace(string(output)), nil
}
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