"git checkout" can be executed without any arguments. What it does is
not exactly great: it switches from HEAD to HEAD and shows worktree
modification as a side effect.
Make switch reject this case. Just use "git status" if you want
that side effect. For switch, you have to either
- really switch a branch
- (explicitly) detach from the current branch
- create a new branch
---
builtin/checkout.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/builtin/checkout.c b/builtin/checkout.c
index 1b1181b220..f9f7ee2936 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -54,6 +54,7 @@ struct checkout_opts {
int overlay_mode;
int no_dwim_new_local_branch;
int accept_pathspec;
+ int switch_branch_doing_nothing_is_ok;
/*
* If new checkout options are added, skip_merge_working_tree
@@ -1334,6 +1335,12 @@ static int checkout_branch(struct checkout_opts *opts,
die(_("Cannot switch branch to a non-commit '%s'"),
new_branch_info->name);
+ if (!opts->switch_branch_doing_nothing_is_ok &&
+ !new_branch_info->name &&
+ !opts->new_branch &&
+ !opts->force_detach)
+ die(_("missing branch or commit argument"));
+
if (new_branch_info->path && !opts->force_detach && !opts->new_branch &&
!opts->ignore_other_worktrees) {
int flag;
@@ -1587,6 +1594,7 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
memset(&opts, 0, sizeof(opts));
opts.no_dwim_new_local_branch = 0;
+ opts.switch_branch_doing_nothing_is_ok = 1;
opts.accept_pathspec = 1;
options = parse_options_dup(checkout_options);
@@ -1616,6 +1624,7 @@ int cmd_switch(int argc, const char **argv, const char *prefix)
memset(&opts, 0, sizeof(opts));
opts.no_dwim_new_local_branch = 0;
opts.accept_pathspec = 0;
+ opts.switch_branch_doing_nothing_is_ok = 0;
options = parse_options_dup(switch_options);
options = add_common_options(&opts, options);
--
2.21.0.rc1.337.gdf7f8d0522
