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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>,
	Tanushree Tumane <tanushreetumane@gmail.com>,
	Miriam Rubio <mirucam@gmail.com>
Subject: [PATCH v2 09/11] bisect: libify `check_good_are_ancestors_of_bad` and its dependents
Date: Tue, 28 Jan 2020 15:40:24 +0100	[thread overview]
Message-ID: <20200128144026.53128-10-mirucam@gmail.com> (raw)
In-Reply-To: <20200128144026.53128-1-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.

Code that turns -11(early success code) to 0 from
`check_good_are_ancestors_of_bad()` has been moved to
`cmd_bisect__helper()`.

Handle the return value in dependent function `bisect_next_all()`.

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                 | 40 ++++++++++++++++++++++++++--------------
 builtin/bisect--helper.c | 12 ++++++++++--
 2 files changed, 36 insertions(+), 16 deletions(-)

diff --git a/bisect.c b/bisect.c
index 2a6566d066..d519e10827 100644
--- a/bisect.c
+++ b/bisect.c
@@ -865,19 +865,27 @@ static int check_ancestors(struct repository *r, int rev_nr,
  *
  * If that's not the case, we need to check the merge bases.
  * If a merge base must be tested by the user, its source code will be
- * checked out to be tested by the user and we will exit.
+ * checked out to be tested by the user and we will return.
  */
-static void check_good_are_ancestors_of_bad(struct repository *r,
+
+static int check_good_are_ancestors_of_bad(struct repository *r,
 					    const char *prefix,
 					    int no_checkout)
 {
-	char *filename = git_pathdup("BISECT_ANCESTORS_OK");
+	char *filename;
 	struct stat st;
 	int fd, rev_nr, res = 0;
 	struct commit **rev;
 
+	/*
+	 * We don't want to clean the bisection state
+	 * as we need to get back to where we started
+	 * by using `git bisect reset`.
+	 */
 	if (!current_bad_oid)
-		die(_("a %s revision is needed"), term_bad);
+		return error(_("a %s revision is needed"), term_bad);
+
+	filename = git_pathdup("BISECT_ANCESTORS_OK");
 
 	/* Check if file BISECT_ANCESTORS_OK exists. */
 	if (!stat(filename, &st) && S_ISREG(st.st_mode))
@@ -893,18 +901,20 @@ static void check_good_are_ancestors_of_bad(struct repository *r,
 	if (check_ancestors(r, rev_nr, rev, prefix))
 		res = check_merge_bases(rev_nr, rev, no_checkout);
 	free(rev);
-	if (res)
-		exit(res == -11 ? 0 : -res);
 
-	/* Create file BISECT_ANCESTORS_OK. */
-	fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600);
-	if (fd < 0)
-		warning_errno(_("could not create file '%s'"),
-			      filename);
-	else
-		close(fd);
+	if (!res)
+	{
+		/* Create file BISECT_ANCESTORS_OK. */
+		fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600);
+		if (fd < 0)
+			warning_errno(_("could not create file '%s'"),
+				      filename);
+		else
+			close(fd);
+	}
  done:
 	free(filename);
+	return res;
 }
 
 /*
@@ -975,7 +985,9 @@ int bisect_next_all(struct repository *r, const char *prefix, int no_checkout)
 	if (read_bisect_refs())
 		die(_("reading bisect refs failed"));
 
-	check_good_are_ancestors_of_bad(r, prefix, no_checkout);
+	res = check_good_are_ancestors_of_bad(r, prefix, no_checkout);
+	if (res)
+		return res;
 
 	bisect_rev_setup(r, &revs, prefix, "%s", "^%s", 1);
 	revs.limited = 1;
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 826fcba2ed..3442bfe2cb 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -666,7 +666,8 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 
 	switch (cmdmode) {
 	case NEXT_ALL:
-		return bisect_next_all(the_repository, prefix, no_checkout);
+		res = bisect_next_all(the_repository, prefix, no_checkout);
+		break;
 	case WRITE_TERMS:
 		if (argc != 2)
 			return error(_("--write-terms requires two arguments"));
@@ -713,5 +714,12 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 		return error("BUG: unknown subcommand '%d'", cmdmode);
 	}
 	free_terms(&terms);
-	return !!res;
+	/*
+	 * Handle early success
+	 * From check_merge_bases > check_good_are_ancestors_of_bad > bisect_next_all
+	 */
+	if (res == -11)
+		res = 0;
+
+	return res < 0 ? -res : res;
 }
-- 
2.21.1 (Apple Git-122.3)


  parent reply	other threads:[~2020-01-28 14:41 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-28 14:40 [Outreachy][PATCH v2 00/11] Finish converting git bisect to C part 1 Miriam Rubio
2020-01-28 14:40 ` [PATCH v2 01/11] bisect--helper: convert `vocab_*` char pointers to char arrays Miriam Rubio
2020-01-28 14:40 ` [PATCH v2 02/11] bisect--helper: change `retval` to `res` Miriam Rubio
2020-01-28 14:40 ` [PATCH v2 03/11] bisect: use the standard 'if (!var)' way to check for 0 Miriam Rubio
2020-01-28 14:40 ` [PATCH v2 04/11] run-command: make `exists_in_PATH()` non-static Miriam Rubio
2020-01-30 12:36   ` Johannes Schindelin
     [not found]     ` <CAN7CjDCiG6KZU+yHGxQ26TESb1yfvc7aWh0EKhE=owSV7D-C0Q@mail.gmail.com>
2020-01-30 14:41       ` Fwd: " Miriam R.
2020-01-28 14:40 ` [PATCH v2 05/11] bisect--helper: introduce new `decide_next()` function Miriam Rubio
2020-01-30 12:31   ` Johannes Schindelin
2020-01-30 14:05     ` Miriam R.
2020-01-28 14:40 ` [PATCH v2 06/11] bisect: libify `exit_if_skipped_commits` to `error_if_skipped*` and its dependents Miriam Rubio
2020-01-31 18:22   ` Junio C Hamano
2020-01-28 14:40 ` [PATCH v2 07/11] bisect: libify `bisect_checkout` Miriam Rubio
2020-01-31 18:31   ` Junio C Hamano
2020-01-28 14:40 ` [PATCH v2 08/11] bisect: libify `check_merge_bases` and its dependents Miriam Rubio
2020-01-31 18:40   ` Junio C Hamano
2020-01-28 14:40 ` Miriam Rubio [this message]
2020-01-30 13:46   ` [PATCH v2 09/11] bisect: libify `check_good_are_ancestors_of_bad` " Johannes Schindelin
2020-01-30 14:40     ` Miriam R.
2020-01-30 15:01       ` Johannes Schindelin
2020-01-30 15:26         ` Miriam R.
2020-01-30 21:59     ` Christian Couder
2020-01-31  9:07       ` Johannes Schindelin
2020-01-31  9:15         ` Christian Couder
     [not found]           ` <CAN7CjDC7ijMDtJdShRB+P0d0GRYYrQXktdH2Og9XGDqJ-OZxzw@mail.gmail.com>
2020-01-31 10:21             ` Fwd: " Miriam R.
2020-01-28 14:40 ` [PATCH v2 10/11] bisect: libify `handle_bad_merge_base` " Miriam Rubio
2020-01-28 14:40 ` [PATCH v2 11/11] bisect: libify `bisect_next_all` Miriam Rubio
2020-01-30 15:04 ` [Outreachy][PATCH v2 00/11] Finish converting git bisect to C part 1 Johannes Schindelin
2020-01-30 15:18   ` Miriam R.

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