By adding this option which defaults to true, we can use the
corresponding --no-checkout to make some customizations before
the checkout, like sparse checkout, etc.

Signed-off-by: Ray Zhang <zhanglei...@gmail.com>
---
 Documentation/git-worktree.txt |  6 +++++-
 builtin/worktree.c             | 15 ++++++++++-----
 t/t2025-worktree-add.sh        |  5 +++++
 3 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index 62c76c1..e96fe0f 100644
--- a/Documentation/git-worktree.txt
+++ b/Documentation/git-worktree.txt
@@ -9,7 +9,7 @@ git-worktree - Manage multiple working trees
 SYNOPSIS
 --------
 [verse]
-'git worktree add' [-f] [--detach] [-b <new-branch>] <path> [<branch>]
+'git worktree add' [-f] [--detach] [--checkout] [-b <new-branch>] <path> 
[<branch>]
 'git worktree prune' [-n] [-v] [--expire <expire>]
 'git worktree list' [--porcelain]
 
@@ -87,6 +87,10 @@ OPTIONS
        With `add`, detach HEAD in the new working tree. See "DETACHED HEAD"
        in linkgit:git-checkout[1].
 
+--checkout::
+       Default option with `add`, populate the new working tree. Use
+       `--no-checkout` to skip the checkout.
+
 -n::
 --dry-run::
        With `prune`, do not remove anything; just report what it would
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 38b5609..e677cd7 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 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->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);
@@ -320,10 +323,12 @@ 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(0, "checkout", &opts.checkout, N_("populate the new 
working tree")),
                OPT_END()
        };
 
        memset(&opts, 0, sizeof(opts));
+       opts.checkout = 1;
        ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
        if (!!opts.detach + !!opts.new_branch + !!new_branch_force > 1)
                die(_("-b, -B, and --detach are mutually exclusive"));
diff --git a/t/t2025-worktree-add.sh b/t/t2025-worktree-add.sh
index cbfa41e..601f963 100755
--- a/t/t2025-worktree-add.sh
+++ b/t/t2025-worktree-add.sh
@@ -213,4 +213,9 @@ test_expect_success 'local clone from linked checkout' '
        ( cd here-clone && git fsck )
 '
 
+test_expect_success '"add" worktree without a checkout' '
+       git worktree add --no-checkout -b swamp swamp &&
+       ( cd swamp && git reset --hard && git fsck)
+'
+
 test_done

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