238 lines
7.3 KiB
Go
238 lines
7.3 KiB
Go
package commands
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import (
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"path/filepath"
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"strings"
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"github.com/git-lfs/git-lfs/errors"
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"github.com/git-lfs/git-lfs/git"
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"github.com/git-lfs/git-lfs/git/githistory"
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"github.com/git-lfs/git-lfs/git/githistory/log"
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"github.com/git-lfs/git-lfs/git/odb"
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"github.com/spf13/cobra"
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)
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var (
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// migrateIncludeRefs is a set of Git references to explicitly include
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// in the migration.
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migrateIncludeRefs []string
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// migrateExcludeRefs is a set of Git references to explicitly exclude
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// in the migration.
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migrateExcludeRefs []string
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)
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// migrate takes the given command and arguments, *odb.ObjectDatabase, as well
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// as a BlobRewriteFn to apply, and performs a migration.
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func migrate(args []string, r *githistory.Rewriter, l *log.Logger, opts *githistory.RewriteOptions) {
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requireInRepo()
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opts, err := rewriteOptions(args, opts)
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if err != nil {
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ExitWithError(err)
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}
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_, err = r.Rewrite(opts)
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if err != nil {
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ExitWithError(err)
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}
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}
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// getObjectDatabase creates a *git.ObjectDatabase from the filesystem pointed
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// at the .git directory of the currently checked-out repository.
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func getObjectDatabase() (*odb.ObjectDatabase, error) {
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dir, err := git.GitDir()
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if err != nil {
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return nil, errors.Wrap(err, "cannot open root")
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}
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return odb.FromFilesystem(filepath.Join(dir, "objects"))
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}
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// rewriteOptions returns *githistory.RewriteOptions able to be passed to a
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// *githistory.Rewriter that reflect the current arguments and flags passed to
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// an invocation of git-lfs-migrate(1).
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//
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// It is merged with the given "opts". In other words, an identical "opts" is
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// returned, where the Include and Exclude fields have been filled based on the
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// following rules:
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//
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// The included and excluded references are determined based on the output of
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// includeExcludeRefs (see below for documentation and detail).
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//
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// If any of the above could not be determined without error, that error will be
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// returned immediately.
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func rewriteOptions(args []string, opts *githistory.RewriteOptions) (*githistory.RewriteOptions, error) {
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include, exclude, err := includeExcludeRefs(args)
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if err != nil {
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return nil, err
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}
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return &githistory.RewriteOptions{
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Include: include,
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Exclude: exclude,
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UpdateRefs: opts.UpdateRefs,
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BlobFn: opts.BlobFn,
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TreeCallbackFn: opts.TreeCallbackFn,
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}, nil
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}
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// includeExcludeRefs returns fully-qualified sets of references to include, and
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// exclude, or an error if those could not be determined.
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//
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// They are determined based on the following rules:
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//
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// - Include all local refs/heads/<branch> references for each branch
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// specified as an argument.
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// - Include the currently checked out branch if no branches are given as
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// arguments and the --include-ref= or --exclude-ref= flag(s) aren't given.
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// - Include all references given in --include-ref=<ref>.
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// - Exclude all references given in --exclude-ref=<ref>.
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func includeExcludeRefs(args []string) (include, exclude []string, err error) {
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hardcore := len(migrateIncludeRefs) > 0 || len(migrateExcludeRefs) > 0
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if len(args) == 0 && !hardcore {
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// If no branches were given explicitly AND neither
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// --include-ref or --exclude-ref flags were given, then add the
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// currently checked out reference.
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current, err := currentRefToMigrate()
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if err != nil {
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return nil, nil, err
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}
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args = append(args, current.Name)
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}
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for _, name := range args {
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// Then, loop through each branch given, resolve that reference,
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// and include it.
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ref, err := git.ResolveRef(name)
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if err != nil {
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return nil, nil, err
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}
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include = append(include, ref.Name)
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}
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if hardcore {
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// If either --include-ref=<ref> or --exclude-ref=<ref> were
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// given, append those to the include and excluded reference
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// set, respectively.
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include = append(include, migrateIncludeRefs...)
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exclude = append(exclude, migrateExcludeRefs...)
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} else {
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// Otherwise, if neither --include-ref=<ref> or
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// --exclude-ref=<ref> were given, include no additional
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// references, and exclude all remote references that are remote
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// branches or remote tags.
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remoteRefs, err := getRemoteRefs()
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if err != nil {
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return nil, nil, err
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}
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exclude = append(exclude, remoteRefs...)
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}
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return include, exclude, nil
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}
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// getRemoteRefs returns a fully qualified set of references belonging to all
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// remotes known by the currently checked-out repository, or an error if those
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// references could not be determined.
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func getRemoteRefs() ([]string, error) {
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var refs []string
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remotes, err := git.RemoteList()
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if err != nil {
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return nil, err
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}
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for _, remote := range remotes {
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refsForRemote, err := git.RemoteRefs(remote)
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if err != nil {
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return nil, err
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}
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for _, ref := range refsForRemote {
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refs = append(refs, formatRefName(ref, remote))
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}
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}
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return refs, nil
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}
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// formatRefName returns the fully-qualified name for the given Git reference
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// "ref".
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func formatRefName(ref *git.Ref, remote string) string {
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var name []string
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switch ref.Type {
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case git.RefTypeRemoteBranch:
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name = []string{"refs", "remotes", remote, ref.Name}
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case git.RefTypeRemoteTag:
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name = []string{"refs", "tags", ref.Name}
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default:
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return ref.Name
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}
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return strings.Join(name, "/")
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}
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// currentRefToMigrate returns the fully-qualified name of the currently
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// checked-out reference, or an error if the reference's type was not a local
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// branch.
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func currentRefToMigrate() (*git.Ref, error) {
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current, err := git.CurrentRef()
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if err != nil {
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return nil, err
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}
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if current.Type == git.RefTypeOther ||
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current.Type == git.RefTypeRemoteBranch ||
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current.Type == git.RefTypeRemoteTag {
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return nil, errors.Errorf("fatal: cannot migrate non-local ref: %s", current.Name)
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}
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return current, nil
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}
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// getHistoryRewriter returns a history rewriter that includes the filepath
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// filter given by the --include and --exclude arguments.
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func getHistoryRewriter(cmd *cobra.Command, db *odb.ObjectDatabase, l *log.Logger) *githistory.Rewriter {
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include, exclude := getIncludeExcludeArgs(cmd)
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filter := buildFilepathFilter(cfg, include, exclude)
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return githistory.NewRewriter(db,
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githistory.WithFilter(filter), githistory.WithLogger(l))
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}
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func init() {
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info := NewCommand("info", migrateInfoCommand)
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info.Flags().IntVar(&migrateInfoTopN, "top", 5, "--top=<n>")
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info.Flags().StringVar(&migrateInfoAboveFmt, "above", "", "--above=<n>")
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info.Flags().StringVar(&migrateInfoUnitFmt, "unit", "", "--unit=<unit>")
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importCmd := NewCommand("import", migrateImportCommand)
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RegisterCommand("migrate", nil, func(cmd *cobra.Command) {
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// Adding flags directly to cmd.Flags() doesn't apply those
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// flags to any subcommands of the root. Therefore, loop through
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// each subcommand specifically, and include common arguments to
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// each.
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//
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// Once done, link each orphaned command to the
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// `git-lfs-migrate(1)` command as a subcommand (child).
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for _, subcommand := range []*cobra.Command{
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importCmd, info,
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} {
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subcommand.Flags().StringVarP(&includeArg, "include", "I", "", "Include a list of paths")
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subcommand.Flags().StringVarP(&excludeArg, "exclude", "X", "", "Exclude a list of paths")
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subcommand.Flags().StringSliceVar(&migrateIncludeRefs, "include-ref", nil, "An explicit list of refs to include")
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subcommand.Flags().StringSliceVar(&migrateExcludeRefs, "exclude-ref", nil, "An explicit list of refs to exclude")
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cmd.AddCommand(subcommand)
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}
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})
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}
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