commit - 088a1c3b8187114bdc9d9f4ee98c2c8dceb97172
commit + 73119b9106d98ab78deb20d3c60c3d4d80ac8688
blob - 0c373141b94712c86b5183baed684811237bfdc0
blob + e845257c2f89b568c18f692452aa7168844627b5
--- cvg/cvg.c
+++ cvg/cvg.c
@@ -9108,6 +9108,8 @@ cmd_info(int argc, char *argv[])
 	printf("work tree branch reference: %s\n",
 	    got_worktree_get_head_ref_name(worktree));
 	printf("work tree UUID: %s\n", uuidstr);
+	printf("work tree format version: %d\n",
+	    got_worktree_get_format_version(worktree));
 	printf("file index version: %u\n",
 	    got_worktree_fileindex_version(fileindex));
 	printf("repository: %s\n", got_worktree_get_repo_path(worktree));
blob - 2affb7860e6b084436d9adf95c331abd8fcfc8f6
blob + 98f2a80a699255349e7df2084f6196ddce1d4d10
--- got/got.c
+++ got/got.c
@@ -14705,6 +14705,8 @@ cmd_info(int argc, char *argv[])
 	printf("work tree branch reference: %s\n",
 	    got_worktree_get_head_ref_name(worktree));
 	printf("work tree UUID: %s\n", uuidstr);
+	printf("work tree format version: %d\n",
+	    got_worktree_get_format_version(worktree));
 	printf("file index version: %u\n",
 	    got_worktree_fileindex_version(fileindex));
 	printf("repository: %s\n", got_worktree_get_repo_path(worktree));
blob - 2ffc0c695b85896305072307f75db7799c0e05a6
blob + 746372d5909f4e6c88f43542fc445638af1b4f4a
--- include/got_worktree.h
+++ include/got_worktree.h
@@ -91,6 +91,11 @@ const char *got_worktree_get_path_prefix(struct got_wo
 const struct got_error *got_worktree_get_uuid(char **, struct got_worktree *);
 
 /*
+ * Get the work tree's format version number.
+ */
+int got_worktree_get_format_version(struct got_worktree *);
+
+/*
  * Check if a user-provided path prefix matches that of the worktree.
  */
 const struct got_error *got_worktree_match_path_prefix(int *,
blob - 2f9d146493695f5d0f999c4ccca8b981ffdf7c9d
blob + b1acd87d261a238419bf3f34736ce810f1efd4b8
--- lib/got_lib_worktree.h
+++ lib/got_lib_worktree.h
@@ -23,6 +23,7 @@ struct got_worktree {
 	struct got_object_id *base_commit_id;
 	char *head_ref_name;
 	uuid_t uuid;
+	int format_version;
 
 	/*
 	 * File descriptor for the lock file, open while a work tree is open.
blob - 4b99863a5f6d3ae6dcce8b52c6d2a93a1a80b3d3
blob + 1855ba0c1a557ce16cfae9790d6cff44a4b71846
--- lib/worktree_open.c
+++ lib/worktree_open.c
@@ -171,6 +171,7 @@ open_worktree(struct got_worktree **worktree, const ch
 		goto done;
 	}
 	(*worktree)->lockfd = -1;
+	(*worktree)->format_version = version;
 
 	(*worktree)->root_path = realpath(path, NULL);
 	if ((*worktree)->root_path == NULL) {
@@ -363,3 +364,9 @@ got_worktree_get_path_prefix(struct got_worktree *work
 {
 	return worktree->path_prefix;
 }
+
+int
+got_worktree_get_format_version(struct got_worktree *worktree)
+{
+	return worktree->format_version;
+}