By adding option -n, we can make some customizations before checkout, like 
sparse checkout, etc.

Signed-off-by: Ray Zhang <zhanglei...@gmail.com>
---
 builtin/worktree.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/builtin/worktree.c b/builtin/worktree.c
index 38b5609..14ca3d9 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -21,6 +21,7 @@ static const char * const worktree_usage[] = {
 struct add_opts {
        int force;
        int detach;
+       int no_checkout;
        const char *new_branch;
        int force_new_branch;
 };
@@ -284,11 +285,13 @@ static int add_worktree(const char *path, const char 
*refname,
        if (ret)
                goto done;
 
-       cp.argv = NULL;
-       argv_array_clear(&cp.args);
-       argv_array_pushl(&cp.args, "reset", "--hard", NULL);
-       cp.env = child_env.argv;
-       ret = run_command(&cp);
+       if (!opts->no_checkout) {
+               cp.argv = NULL;
+               argv_array_clear(&cp.args);
+               argv_array_pushl(&cp.args, "reset", "--hard", NULL);
+               cp.env = child_env.argv;
+               ret = run_command(&cp);
+       }
        if (!ret) {
                is_junk = 0;
                free(junk_work_tree);
@@ -320,6 +323,7 @@ static int add(int ac, const char **av, const char *prefix)
                OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
                           N_("create or reset a branch")),
                OPT_BOOL(0, "detach", &opts.detach, N_("detach HEAD at named 
commit")),
+               OPT_BOOL('n', "no-checkout", &opts.no_checkout, N_("don't 
create a checkout")),
                OPT_END()
        };
 

--
https://github.com/git/git/pull/217
--
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