Re: [PATCH 2/2] Rebase: Run post-checkout hook on checkout

> From: Orgad Shaneh <orgads@gmail.com>
> 
> The scripted version of rebase used to run this hook on the initial
> checkout. The transition to built-in introduced a regression.
> 
> Signed-off-by: Orgad Shaneh <orgads@gmail.com>

> ---
>  builtin/rebase.c              | 12 ++++++++++--
>  t/t5403-post-checkout-hook.sh | 20 ++++++++++++++++++++
>  2 files changed, 30 insertions(+), 2 deletions(-)
> 
> diff --git a/builtin/rebase.c b/builtin/rebase.c
> index b5c99ec10c..8402765a79 100644
> --- a/builtin/rebase.c
> +++ b/builtin/rebase.c
> @@ -530,6 +530,7 @@ static int run_specific_rebase(struct rebase_options *opts)
>  
>  #define RESET_HEAD_DETACH (1<<0)
>  #define RESET_HEAD_HARD (1<<1)
> +#define RESET_HEAD_RUN_POST_CHECKOUT_HOOK (1<<2)
>  
>  static int reset_head(struct object_id *oid, const char *action,
>  		      const char *switch_to_branch, unsigned flags,
> @@ -537,6 +538,7 @@ static int reset_head(struct object_id *oid, const char *action,
>  {
>  	unsigned detach_head = flags & RESET_HEAD_DETACH;
>  	unsigned reset_hard = flags & RESET_HEAD_HARD;
> +	unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
>  	struct object_id head_oid;
>  	struct tree_desc desc[2] = { { NULL }, { NULL } };
>  	struct lock_file lock = LOCK_INIT;
> @@ -636,6 +638,10 @@ static int reset_head(struct object_id *oid, const char *action,
>  			ret = update_ref(reflog_head, "HEAD", oid, NULL, 0,
>  					 UPDATE_REFS_MSG_ON_ERR);
>  	}
> +	if (run_hook)
> +		run_hook_le(NULL, "post-checkout",
> +			    oid_to_hex(orig ? orig : &null_oid),
> +			    oid_to_hex(oid), "1", NULL);
>  
>  leave_reset_head:
>  	strbuf_release(&msg);
> @@ -1465,7 +1471,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
>  					    getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
>  					    options.switch_to);
>  				if (reset_head(&oid, "checkout",
> -					       options.head_name, 0,
> +					       options.head_name,
> +					       RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
>  					       NULL, buf.buf) < 0) {
>  					ret = !!error(_("could not switch to "
>  							"%s"),
> @@ -1539,7 +1546,8 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
>  	strbuf_addf(&msg, "%s: checkout %s",
>  		    getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
>  	if (reset_head(&options.onto->object.oid, "checkout", NULL,
> -		       RESET_HEAD_DETACH, NULL, msg.buf))
> +		       RESET_HEAD_DETACH | RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
> +		       NULL, msg.buf))
>  		die(_("Could not detach HEAD"));
>  	strbuf_release(&msg);
>  
> diff --git a/t/t5403-post-checkout-hook.sh b/t/t5403-post-checkout-hook.sh
> index 1d15a1031f..a539ffc080 100755
> --- a/t/t5403-post-checkout-hook.sh
> +++ b/t/t5403-post-checkout-hook.sh
> @@ -13,6 +13,8 @@ test_expect_success setup '
>  	EOF
>  	test_commit one &&
>  	test_commit two &&
> +	test_commit rebase-on-me &&
> +	git reset --hard HEAD^ &&
>  	test_commit three
>  '
>  
> @@ -44,6 +46,24 @@ test_expect_success 'post-checkout receives the right args when not switching br
>  	test $old = $new && test $flag = 0
>  '
>  
> +test_expect_success 'post-checkout is triggered on rebase' '
> +	test_when_finished "rm -f .git/post-checkout.args" &&
> +	git checkout -b rebase-test master &&
> +	rm -f .git/post-checkout.args &&
> +	git rebase rebase-on-me &&
> +	read old new flag <.git/post-checkout.args &&
> +	test $old != $new && test $flag = 1
> +'
> +
> +test_expect_success 'post-checkout is triggered on rebase with fast-forward' '
> +	test_when_finished "rm -f .git/post-checkout.args" &&
> +	git checkout -b ff-rebase-test rebase-on-me^ &&
> +	rm -f .git/post-checkout.args &&
> +	git rebase rebase-on-me &&
> +	read old new flag <.git/post-checkout.args &&
> +	test $old != $new && test $flag = 1
> +'
> +
>  test_expect_success 'post-checkout hook is triggered by clone' '
>  	mkdir -p templates/hooks &&
>  	write_script templates/hooks/post-checkout <<-\EOF &&
> -- 
> 2.20.1
> 
>