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migration3.go
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migration3.go
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package migration3
import (
"errors"
"fmt"
afterbug "github.com/MichaelMure/git-bug-migration/migration3/after/bug"
afterentity "github.com/MichaelMure/git-bug-migration/migration3/after/entity"
afteridentity "github.com/MichaelMure/git-bug-migration/migration3/after/identity"
afterrepo "github.com/MichaelMure/git-bug-migration/migration3/after/repository"
beforebug "github.com/MichaelMure/git-bug-migration/migration3/before/bug"
beforeentity "github.com/MichaelMure/git-bug-migration/migration3/before/entity"
beforeidentity "github.com/MichaelMure/git-bug-migration/migration3/before/identity"
beforerepo "github.com/MichaelMure/git-bug-migration/migration3/before/repository"
)
type Migration3 struct{}
func (m *Migration3) Description() string {
return "Make bug and identities independent from the storage by making the ID generation self-contained. " +
"Also, migrate to the new full DAG entity data model."
}
func (m *Migration3) Run(repoPath string) error {
oldRepo, err := beforerepo.NewGoGitRepo(repoPath, nil)
if err != nil {
return err
}
newRepo, err := afterrepo.OpenGoGitRepo(repoPath, nil)
if err != nil {
return err
}
return m.migrate(oldRepo, newRepo)
}
func (m *Migration3) migrate(oldRepo beforerepo.ClockedRepo, newRepo afterrepo.ClockedRepo) error {
userId, err := beforeidentity.GetUserIdentityId(oldRepo)
if err != nil && err != beforeidentity.ErrNoIdentitySet {
return err
}
migratedIdentities := map[beforeentity.Id]*afteridentity.Identity{}
for streamedIdentity := range beforeidentity.ReadAllLocal(oldRepo) {
if streamedIdentity.Err != nil {
if errors.Is(streamedIdentity.Err, beforeidentity.ErrInvalidFormatVersion) {
fmt.Print("skipping bug, already updated\n")
continue
} else {
fmt.Printf("got error, assuming identity already migrated: %q", streamedIdentity.Err)
}
}
oldIdentity := streamedIdentity.Identity
fmt.Printf("identity %s: ", oldIdentity.Id().Human())
newIdentity, err := afteridentity.NewIdentityFull(
newRepo,
oldIdentity.Name(),
oldIdentity.Email(),
oldIdentity.Login(),
oldIdentity.AvatarUrl(),
nil,
)
if err != nil {
return err
}
migratedIdentities[oldIdentity.Id()] = newIdentity
if err := newIdentity.Commit(newRepo); err != nil {
return err
}
fmt.Printf("migrated to %s\n", newIdentity.Id().Human())
}
for streamedBug := range beforebug.ReadAllLocal(oldRepo) {
if streamedBug.Err != nil {
if streamedBug.Err != beforebug.ErrInvalidFormatVersion {
fmt.Printf("got error when reading bug, assuming data is already migrated: %q\n", streamedBug.Err)
} else {
fmt.Printf("skipping bug, already updated\n")
}
continue
}
oldBug := streamedBug.Bug
fmt.Printf("bug %s: ", oldBug.Id().Human())
newBug, err := migrateBug(oldBug, migratedIdentities)
if err != nil {
return err
}
if err := newBug.Commit(newRepo); err != nil {
return err
}
fmt.Printf("migrated to %s\n", newBug.Id().Human())
if err := beforebug.RemoveBug(oldRepo, oldBug.Id()); err != nil {
return err
}
}
for oldIdentity := range migratedIdentities {
if err := beforeidentity.RemoveIdentity(oldRepo, oldIdentity); err != nil {
return err
}
}
if userId != beforeentity.UnsetId {
newUserId := migratedIdentities[userId]
err = afteridentity.SetUserIdentity(newRepo, newUserId)
if err != nil {
return err
}
}
return nil
}
func migrateBug(oldBug *beforebug.Bug, migratedIdentities map[beforeentity.Id]*afteridentity.Identity) (*afterbug.Bug, error) {
// Making a new bug
newBug := afterbug.NewBug()
migratedOperations := map[beforeentity.Id]afterentity.Id{}
// Iterating over each operation in the bug
it := beforebug.NewOperationIterator(oldBug)
for it.Next() {
oldOperation := it.Value()
var newOperation afterbug.Operation
switch operation := oldOperation.(type) {
case *beforebug.AddCommentOperation:
newOperation = afterbug.NewAddCommentOp(
migratedIdentities[operation.Author.Id()],
operation.Time().Unix(),
operation.Message,
migrateHashes(operation.Files),
)
case *beforebug.CreateOperation:
newOperation = afterbug.NewCreateOp(
migratedIdentities[operation.Author.Id()],
operation.Time().Unix(),
operation.Title,
operation.Message,
migrateHashes(operation.Files),
)
case *beforebug.EditCommentOperation:
newOperation = afterbug.NewEditCommentOp(
migratedIdentities[operation.Author.Id()],
operation.Time().Unix(),
migratedOperations[operation.Target],
operation.Message,
migrateHashes(operation.Files),
)
case *beforebug.LabelChangeOperation:
newOperation = afterbug.NewLabelChangeOperation(
migratedIdentities[operation.Author.Id()],
operation.Time().Unix(),
migrateLabels(operation.Added),
migrateLabels(operation.Removed),
)
case *beforebug.NoOpOperation:
newOperation = afterbug.NewNoOpOp(
migratedIdentities[operation.Author.Id()],
operation.Time().Unix(),
)
case *beforebug.SetMetadataOperation:
newOperation = afterbug.NewSetMetadataOp(
migratedIdentities[operation.Author.Id()],
operation.Time().Unix(),
migratedOperations[operation.Target],
operation.Metadata,
)
case *beforebug.SetStatusOperation:
newOperation = afterbug.NewSetStatusOp(
migratedIdentities[operation.Author.Id()],
operation.Time().Unix(),
afterbug.Status(operation.Status),
)
case *beforebug.SetTitleOperation:
newOperation = afterbug.NewSetTitleOp(
migratedIdentities[operation.Author.Id()],
operation.Time().Unix(),
operation.Title,
operation.Was,
)
default:
return nil, fmt.Errorf("Unknown oldOperation type: %T\n", operation)
}
newBug.Append(newOperation)
migratedOperations[oldOperation.Id()] = newOperation.Id()
}
return newBug, nil
}
func migrateHashes(oldHashes []beforerepo.Hash) (newHashes []afterrepo.Hash) {
for _, hash := range oldHashes {
newHashes = append(newHashes, afterrepo.Hash(hash))
}
return
}
func migrateLabels(oldLabels []beforebug.Label) (newLabels []afterbug.Label) {
for _, label := range oldLabels {
newLabels = append(newLabels, afterbug.Label(label))
}
return
}