Introduce the switch to enable file path pattern match caching during LFS migration

Author: alexkad0

commands/command_migrate.go

@@ -63,6 +63,10 @@ var (
 	// migrateFixup is the flag indicating whether or not to infer the
 	// included and excluded filepath patterns.
 	migrateFixup bool
+
+	// migrateCacheFilePathFilterResult is the flag indicating that a file path
+	// filter result may be cached
+	migrateCacheFilePathFilterResults bool
 )
 
 // migrate takes the given command and arguments, *gitobj.ObjectDatabase, as well
@@ -401,6 +405,7 @@ func init() {
 	importCmd.Flags().BoolVar(&migrateNoRewrite, "no-rewrite", false, "Add new history without rewriting previous")
 	importCmd.Flags().StringVarP(&migrateCommitMessage, "message", "m", "", "With --no-rewrite, an optional commit message")
 	importCmd.Flags().BoolVar(&migrateFixup, "fixup", false, "Infer filepaths based on .gitattributes")
+	importCmd.Flags().BoolVar(&migrateCacheFilePathFilterResults, "cache-file-path-filter-results", false, "Cache file path filter results")
 
 	exportCmd := NewCommand("export", migrateExportCommand)
 	exportCmd.Flags().BoolVar(&migrateVerbose, "verbose", false, "Verbose logging")

commands/commands.go

@@ -134,7 +134,7 @@ func buildFilepathFilter(config *config.Configuration, includeArg, excludeArg *s
 
 func buildFilepathFilterWithPatternType(config *config.Configuration, includeArg, excludeArg *string, useFetchOptions bool, patternType filepathfilter.PatternType) *filepathfilter.Filter {
 	inc, exc := determineIncludeExcludePaths(config, includeArg, excludeArg, useFetchOptions)
-	return filepathfilter.New(inc, exc, patternType)
+	return filepathfilter.New(inc, exc, patternType, filepathfilter.UseCache(migrateCacheFilePathFilterResults))
 }
 
 func downloadTransfer(p *lfs.WrappedPointer) (name, path, oid string, size int64, missing bool, err error) {

docs/man/git-lfs-migrate.adoc

@@ -149,6 +149,10 @@ export::
 `--include-ref` or `--exclude-ref`.
 `--everything`::
   See <<_include_and_exclude_references>>.
+`--cache-file-path-filter-results`::
+  Makes Git LFS cache the result of include or exclude file path pattern matching
+  while importing Git objects to LFS. This may speed up migration of a large
+  repository.
 +
 Note: Git refs are "case-sensitive" on all platforms in "packed from"
 (see `git-pack-refs(1)`). On "case-insensitive" file systems, e.g. NTFS