rebase: stop reading and writing unnecessary strategy state

The state files for "--strategy" and "--strategy-option" are written and
read twice, once by builtin/rebase.c and then by sequencer.c. This is an
artifact of the scripted rebase and the need to support "rebase
--preserve-merges". Now that "--preserve-merges" no-longer exists we
only need to read and write these files in sequencer.c. This enables us
to remove a call to free() in read_strategy_opts() that was added by
f1f4ebf (sequencer.c: fix "opts->strategy" leak in
read_strategy_opts(), 2022-11-08) as this commit fixes the root cause of
that leak.

There is further scope for removing duplication in the reading and
writing of state files between builtin/rebase.c and sequencer.c but that
is left for a follow up series.

Reviewed-by: Elijah Newren <[email protected]>
Signed-off-by: Phillip Wood <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

builtin/rebase.c

@@ -483,24 +483,6 @@ static int read_basic_state(struct rebase_options *opts)
 		opts->gpg_sign_opt = xstrdup(buf.buf);
 	}
 
-	if (file_exists(state_dir_path("strategy", opts))) {
-		strbuf_reset(&buf);
-		if (!read_oneliner(&buf, state_dir_path("strategy", opts),
-				   READ_ONELINER_WARN_MISSING))
-			return -1;
-		free(opts->strategy);
-		opts->strategy = xstrdup(buf.buf);
-	}
-
-	if (file_exists(state_dir_path("strategy_opts", opts))) {
-		strbuf_reset(&buf);
-		if (!read_oneliner(&buf, state_dir_path("strategy_opts", opts),
-				   READ_ONELINER_WARN_MISSING))
-			return -1;
-		free(opts->strategy_opts);
-		opts->strategy_opts = xstrdup(buf.buf);
-	}
-
 	strbuf_release(&buf);
 
 	return 0;
@@ -518,12 +500,6 @@ static int rebase_write_basic_state(struct rebase_options *opts)
 		write_file(state_dir_path("quiet", opts), "%s", "");
 	if (opts->flags & REBASE_VERBOSE)
 		write_file(state_dir_path("verbose", opts), "%s", "");
-	if (opts->strategy)
-		write_file(state_dir_path("strategy", opts), "%s",
-			   opts->strategy);
-	if (opts->strategy_opts)
-		write_file(state_dir_path("strategy_opts", opts), "%s",
-			   opts->strategy_opts);
 	if (opts->allow_rerere_autoupdate > 0)
 		write_file(state_dir_path("allow_rerere_autoupdate", opts),
 			   "-%s-rerere-autoupdate",

sequencer.c

@@ -2944,7 +2944,6 @@ static void read_strategy_opts(struct replay_opts *opts, struct strbuf *buf)
 	strbuf_reset(buf);
 	if (!read_oneliner(buf, rebase_path_strategy(), 0))
 		return;
-	free(opts->strategy);
 	opts->strategy = strbuf_detach(buf, NULL);
 	if (!read_oneliner(buf, rebase_path_strategy_opts(), 0))
 		return;