Subject: Re: [PATCH 10/17] hook: convert 'post-rewrite' hook to config

From: Josh Steadmon <[email-masked]>
Date: Tue, 8 Dec 2020 15:02:13 -0800

On 2020.12.04 17:49, Emily Shaffer wrote:
> diff --git a/sequencer.c b/sequencer.c
> index 5a98fd2fbc..4befd862ff 100644
> --- a/sequencer.c
> +++ b/sequencer.c
> @@ -35,6 +35,7 @@
>  #include "rebase-interactive.h"
>  #include "reset.h"
>  #include "hook.h"
> +#include "string-list.h"
>  
>  #define GIT_REFLOG_ACTION "GIT_REFLOG_ACTION"
>  
> @@ -1143,33 +1144,23 @@ int update_head_with_reflog(const struct commit *old_head,
>  static int run_rewrite_hook(const struct object_id *oldoid,
>  			    const struct object_id *newoid)
>  {
> -	struct child_process proc = CHILD_PROCESS_INIT;
> -	const char *argv[3];
> +	struct run_hooks_opt opt = RUN_HOOKS_OPT_INIT_ASYNC;
> +	struct strbuf tmp = STRBUF_INIT;
>  	int code;
> -	struct strbuf sb = STRBUF_INIT;
>  
> -	argv[0] = find_hook("post-rewrite");
> -	if (!argv[0])
> -		return 0;
> +	strvec_push(&opt.args, "amend");
>  
> -	argv[1] = "amend";
> -	argv[2] = NULL;
> -
> -	proc.argv = argv;
> -	proc.in = -1;
> -	proc.stdout_to_stderr = 1;
> -	proc.trace2_hook_name = "post-rewrite";
> -
> -	code = start_command(&proc);
> -	if (code)
> -		return code;
> -	strbuf_addf(&sb, "%s %s\n", oid_to_hex(oldoid), oid_to_hex(newoid));
> -	sigchain_push(SIGPIPE, SIG_IGN);

Here and in a few other later patches, we're removing some signal
handling that doesn't seem to be replicated in the run_hooks()
implementation. Can you add a note to the commit message about why this
is OK?

> -	write_in_full(proc.in, sb.buf, sb.len);
> -	close(proc.in);
> -	strbuf_release(&sb);
> -	sigchain_pop(SIGPIPE);
> -	return finish_command(&proc);
> +	strbuf_addf(&tmp,
> +		    "%s %s",
> +		    oid_to_hex(oldoid),
> +		    oid_to_hex(newoid));
> +	string_list_append(&opt.str_stdin, tmp.buf);
> +
> +	code = run_hooks("post-rewrite", &opt);
> +
> +	run_hooks_opt_clear(&opt);
> +	strbuf_release(&tmp);
> +	return code;
>  }
>  
>  void commit_post_rewrite(struct repository *r,
> @@ -4317,30 +4308,21 @@ static int pick_commits(struct repository *r,
>  		flush_rewritten_pending();
>  		if (!stat(rebase_path_rewritten_list(), &st) &&
>  				st.st_size > 0) {
> -			struct child_process child = CHILD_PROCESS_INIT;
> -			const char *post_rewrite_hook =
> -				find_hook("post-rewrite");
> -
> -			child.in = open(rebase_path_rewritten_list(), O_RDONLY);
> -			child.git_cmd = 1;
> -			strvec_push(&child.args, "notes");
> -			strvec_push(&child.args, "copy");
> -			strvec_push(&child.args, "--for-rewrite=rebase");
> +			struct child_process notes_cp = CHILD_PROCESS_INIT;
> +			struct run_hooks_opt hook_opt = RUN_HOOKS_OPT_INIT_ASYNC;
> +
> +			notes_cp.in = open(rebase_path_rewritten_list(), O_RDONLY);
> +			notes_cp.git_cmd = 1;
> +			strvec_push(&notes_cp.args, "notes");
> +			strvec_push(&notes_cp.args, "copy");
> +			strvec_push(&notes_cp.args, "--for-rewrite=rebase");
>  			/* we don't care if this copying failed */
> -			run_command(&child);
> -
> -			if (post_rewrite_hook) {
> -				struct child_process hook = CHILD_PROCESS_INIT;
> -
> -				hook.in = open(rebase_path_rewritten_list(),
> -					O_RDONLY);
> -				hook.stdout_to_stderr = 1;
> -				hook.trace2_hook_name = "post-rewrite";
> -				strvec_push(&hook.args, post_rewrite_hook);
> -				strvec_push(&hook.args, "rebase");
> -				/* we don't care if this hook failed */
> -				run_command(&hook);
> -			}
> +			run_command(&notes_cp);
> +
> +			hook_opt.path_to_stdin = rebase_path_rewritten_list();
> +			strvec_push(&hook_opt.args, "rebase");
> +			run_hooks("post-rewrite", &hook_opt);
> +			run_hooks_opt_clear(&hook_opt);
>  		}
>  		apply_autostash(rebase_path_autostash());
>  
> -- 
> 2.28.0.rc0.142.g3c755180ce-goog
>