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From: Miriam Rubio <mirucam@gmail.com>
To: git@vger.kernel.org
Cc: Pranit Bauva <pranit.bauva@gmail.com>,
	Christian Couder <chriscool@tuxfamily.org>,
	Johannes Schindelin <Johannes.Schindelin@gmx.de>,
	Tanushree Tumane <tanushreetumane@gmail.com>,
	Miriam Rubio <mirucam@gmail.com>
Subject: [PATCH v3 09/13] bisect: libify `bisect_checkout`
Date: Sat,  8 Feb 2020 10:07:00 +0100	[thread overview]
Message-ID: <20200208090704.26506-10-mirucam@gmail.com> (raw)
In-Reply-To: <20200208090704.26506-1-mirucam@gmail.com>

From: Pranit Bauva <pranit.bauva@gmail.com>

Since we want to get rid of git-bisect.sh, it would be necessary to
convert those exit() calls to return statements so that errors can be
reported.

Emulate try catch in C by converting `exit(<positive-value>)` to
`return <negative-value>`. Follow POSIX conventions to return
<negative-value> to indicate error.

Turn `exit()` to `return` calls in `bisect_checkout()`.
Changes related to return values have no bad side effects on the
code that calls `bisect_checkout()`.

Mentored-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Pranit Bauva <pranit.bauva@gmail.com>
Signed-off-by: Tanushree Tumane <tanushreetumane@gmail.com>
Signed-off-by: Miriam Rubio <mirucam@gmail.com>
---
 bisect.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/bisect.c b/bisect.c
index 85bda3500b..f6582ddfed 100644
--- a/bisect.c
+++ b/bisect.c
@@ -704,9 +704,10 @@ static int is_expected_rev(const struct object_id *oid)
 	return res;
 }
 
-static int bisect_checkout(const struct object_id *bisect_rev, int no_checkout)
+static enum bisect_error bisect_checkout(const struct object_id *bisect_rev, int no_checkout)
 {
 	char bisect_rev_hex[GIT_MAX_HEXSZ + 1];
+	enum bisect_error res = BISECT_OK;
 
 	memcpy(bisect_rev_hex, oid_to_hex(bisect_rev), the_hash_algo->hexsz + 1);
 	update_ref(NULL, "BISECT_EXPECTED_REV", bisect_rev, NULL, 0, UPDATE_REFS_DIE_ON_ERR);
@@ -716,14 +717,24 @@ static int bisect_checkout(const struct object_id *bisect_rev, int no_checkout)
 		update_ref(NULL, "BISECT_HEAD", bisect_rev, NULL, 0,
 			   UPDATE_REFS_DIE_ON_ERR);
 	} else {
-		int res;
 		res = run_command_v_opt(argv_checkout, RUN_GIT_CMD);
 		if (res)
-			exit(res);
+			/*
+			 * Errors in `run_command()` itself, signaled by res < 0,
+			 * and errors in the child process, signaled by res > 0
+			 * can both be treated as regular BISECT_FAILURE (-1).
+			 */
+			return -abs(res);
 	}
 
 	argv_show_branch[1] = bisect_rev_hex;
-	return run_command_v_opt(argv_show_branch, RUN_GIT_CMD);
+	res = run_command_v_opt(argv_show_branch, RUN_GIT_CMD);
+	/*
+	 * Errors in `run_command()` itself, signaled by res < 0,
+	 * and errors in the child process, signaled by res > 0
+	 * can both be treated as regular BISECT_FAILURE (-1).
+	 */
+	return -abs(res);
 }
 
 static struct commit *get_commit_reference(struct repository *r,
-- 
2.25.0


  parent reply	other threads:[~2020-02-08  9:08 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-08  9:06 [Outreachy] [PATCH v3 00/13] Finish converting git bisect to C part 1 Miriam Rubio
2020-02-08  9:06 ` [PATCH v3 01/13] bisect--helper: convert `vocab_*` char pointers to char arrays Miriam Rubio
2020-02-08  9:06 ` [PATCH v3 02/13] bisect--helper: change `retval` to `res` Miriam Rubio
2020-02-08  9:06 ` [PATCH v3 03/13] bisect: use the standard 'if (!var)' way to check for 0 Miriam Rubio
2020-02-08  9:06 ` [PATCH v3 04/13] run-command: make `exists_in_PATH()` non-static Miriam Rubio
2020-02-08 10:55   ` René Scharfe
2020-02-09  9:59     ` Miriam R.
     [not found]       ` <CAN7CjDC46xTHBxvkbWvYfUt91Z6sdPP1tT3rJBoc4x6QCrv+2A@mail.gmail.com>
     [not found]         ` <47b51655-6373-0d5f-1397-8cbbb73d6661@web.de>
2020-02-10 16:05           ` Miriam R.
2020-02-09 23:16   ` Taylor Blau
2020-02-08  9:06 ` [PATCH v3 05/13] bisect--helper: introduce new `decide_next()` function Miriam Rubio
2020-02-08  9:06 ` [PATCH v3 06/13] bisect: add enum to represent bisect returning codes Miriam Rubio
2020-02-08  9:06 ` [PATCH v3 07/13] bisect--helper: return error codes from `cmd_bisect__helper()` Miriam Rubio
2020-02-08  9:06 ` [PATCH v3 08/13] bisect: libify `exit_if_skipped_commits` to `error_if_skipped*` and its dependents Miriam Rubio
2020-02-08  9:07 ` Miriam Rubio [this message]
2020-02-08  9:07 ` [PATCH v3 10/13] bisect: libify `check_merge_bases` " Miriam Rubio
2020-02-08  9:07 ` [PATCH v3 11/13] bisect: libify `check_good_are_ancestors_of_bad` " Miriam Rubio
2020-02-08  9:07 ` [PATCH v3 12/13] bisect: libify `handle_bad_merge_base` " Miriam Rubio
2020-02-08  9:07 ` [PATCH v3 13/13] bisect: libify `bisect_next_all` Miriam Rubio

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