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|
package identity
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 identities state
func Fetch(repo repository.Repo, remote string) (string, error) {
remoteRefSpec := fmt.Sprintf(identityRemoteRefPattern, remote)
fetchRefSpec := fmt.Sprintf("%s*:%s*", identityRefPattern, 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, identityRefPattern+"*")
}
// 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 identity
func MergeAll(repo repository.ClockedRepo, remote string) <-chan MergeResult {
out := make(chan MergeResult)
go func() {
defer close(out)
remoteRefSpec := fmt.Sprintf(identityRemoteRefPattern, 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]
remoteIdentity, err := read(repo, remoteRef)
if err != nil {
out <- newMergeInvalidStatus(id, errors.Wrap(err, "remote identity is not readable").Error())
continue
}
// Check for error in remote data
if err := remoteIdentity.Validate(); err != nil {
out <- newMergeInvalidStatus(id, errors.Wrap(err, "remote identity is invalid").Error())
continue
}
localRef := identityRefPattern + remoteIdentity.Id()
localExist, err := repo.RefExist(localRef)
if err != nil {
out <- newMergeError(err, id)
continue
}
// the identity 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, remoteIdentity)
continue
}
localIdentity, err := read(repo, localRef)
if err != nil {
out <- newMergeError(errors.Wrap(err, "local identity is not readable"), id)
return
}
updated, err := localIdentity.Merge(repo, remoteIdentity)
if err != nil {
out <- newMergeInvalidStatus(id, errors.Wrap(err, "merge failed").Error())
return
}
if updated {
out <- newMergeStatus(MergeStatusUpdated, id, localIdentity)
} else {
out <- newMergeStatus(MergeStatusNothing, id, localIdentity)
}
}
}()
return out
}
// MergeStatus represent the result of a merge operation of a bug
type MergeStatus int
const (
_ MergeStatus = iota
MergeStatusNew
MergeStatusInvalid
MergeStatusUpdated
MergeStatusNothing
)
// Todo: share a generalized MergeResult with the bug package ?
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
Identity *Identity
}
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, identity *Identity) MergeResult {
return MergeResult{
Id: id,
Status: status,
// Identity is not set for an invalid merge result
Identity: identity,
}
}
func newMergeInvalidStatus(id string, reason string) MergeResult {
return MergeResult{
Id: id,
Status: MergeStatusInvalid,
Reason: reason,
}
}
|
