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|
package bug
import (
"fmt"
"strings"
"github.com/MichaelMure/git-bug/repository"
"github.com/pkg/errors"
)
// Fetch retrieve updates from a remote
// This does not change the local bugs state
func Fetch(repo repository.Repo, remote string) (string, error) {
remoteRefSpec := fmt.Sprintf(bugsRemoteRefPattern, remote)
fetchRefSpec := fmt.Sprintf("%s*:%s*", bugsRefPattern, remoteRefSpec)
return repo.FetchRefs(remote, fetchRefSpec)
}
// Push update a remote with the local changes
func Push(repo repository.Repo, remote string) (string, error) {
return repo.PushRefs(remote, bugsRefPattern+"*")
}
// Pull will do a Fetch + MergeAll
// This function will return an error if a merge fail
func Pull(repo repository.ClockedRepo, remote string) error {
_, err := Fetch(repo, remote)
if err != nil {
return err
}
for merge := range MergeAll(repo, remote) {
if merge.Err != nil {
return merge.Err
}
if merge.Status == MergeStatusInvalid {
return errors.Errorf("merge failure: %s", merge.Reason)
}
}
return nil
}
// MergeAll will merge all the available remote bug:
//
// - If the remote has new commit, the local bug is updated to match the same history
// (fast-forward update)
// - if the local bug has new commits but the remote don't, nothing is changed
// - if both local and remote bug have new commits (that is, we have a concurrent edition),
// new local commits are rewritten at the head of the remote history (that is, a rebase)
func MergeAll(repo repository.ClockedRepo, remote string) <-chan MergeResult {
out := make(chan MergeResult)
go func() {
defer close(out)
remoteRefSpec := fmt.Sprintf(bugsRemoteRefPattern, remote)
remoteRefs, err := repo.ListRefs(remoteRefSpec)
if err != nil {
out <- MergeResult{Err: err}
return
}
for _, remoteRef := range remoteRefs {
refSplitted := strings.Split(remoteRef, "/")
id := refSplitted[len(refSplitted)-1]
remoteBug, err := readBug(repo, remoteRef)
if err != nil {
out <- newMergeInvalidStatus(id, errors.Wrap(err, "remote bug is not readable").Error())
continue
}
// Check for error in remote data
if err := remoteBug.Validate(); err != nil {
out <- newMergeInvalidStatus(id, errors.Wrap(err, "remote bug is invalid").Error())
continue
}
localRef := bugsRefPattern + remoteBug.Id()
localExist, err := repo.RefExist(localRef)
if err != nil {
out <- newMergeError(err, id)
continue
}
// the bug is not local yet, simply create the reference
if !localExist {
err := repo.CopyRef(remoteRef, localRef)
if err != nil {
out <- newMergeError(err, id)
return
}
out <- newMergeStatus(MergeStatusNew, id, remoteBug)
continue
}
localBug, err := readBug(repo, localRef)
if err != nil {
out <- newMergeError(errors.Wrap(err, "local bug is not readable"), id)
return
}
updated, err := localBug.Merge(repo, remoteBug)
if err != nil {
out <- newMergeInvalidStatus(id, errors.Wrap(err, "merge failed").Error())
return
}
if updated {
out <- newMergeStatus(MergeStatusUpdated, id, localBug)
} else {
out <- newMergeStatus(MergeStatusNothing, id, localBug)
}
}
}()
return out
}
// MergeStatus represent the result of a merge operation of a bug
type MergeStatus int
const (
_ MergeStatus = iota
MergeStatusNew
MergeStatusInvalid
MergeStatusUpdated
MergeStatusNothing
)
type MergeResult struct {
// Err is set when a terminal error occur in the process
Err error
Id string
Status MergeStatus
// Only set for invalid status
Reason string
// Not set for invalid status
Bug *Bug
}
func (mr MergeResult) String() string {
switch mr.Status {
case MergeStatusNew:
return "new"
case MergeStatusInvalid:
return fmt.Sprintf("invalid data: %s", mr.Reason)
case MergeStatusUpdated:
return "updated"
case MergeStatusNothing:
return "nothing to do"
default:
panic("unknown merge status")
}
}
func newMergeError(err error, id string) MergeResult {
return MergeResult{
Err: err,
Id: id,
}
}
func newMergeStatus(status MergeStatus, id string, bug *Bug) MergeResult {
return MergeResult{
Id: id,
Status: status,
// Bug is not set for an invalid merge result
Bug: bug,
}
}
func newMergeInvalidStatus(id string, reason string) MergeResult {
return MergeResult{
Id: id,
Status: MergeStatusInvalid,
Reason: reason,
}
}
|
