[PATCH v2 08/11] bisect: libify `check_merge_bases` and its dependents
- From
Miriam Rubio <mirucam@gmail.com>
- Date
- Jan 28, 2020, 14:40 UTC
- Message-ID
- <20200128144026.53128-9-mirucam@gmail.com>
- 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.
In `check_merge_bases()` there is an early success special case, so we have introduced special error code `-11` which indicates early success. This `-11` is converted back to `0` in `check_good_are_ancestors_of_bad()`.
Handle the return value in dependent function `check_good_are_ancestors_of_bad()`.
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 | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-)
diff --git a/bisect.c b/bisect.c index dee8318d9b..2a6566d066 100644 --- a/bisect.c +++ b/bisect.c @@ -806,13 +806,16 @@ static void handle_skipped_merge_base(const struct object_id *mb) * "check_merge_bases" checks that merge bases are not "bad" (or "new"). * * - If one is "bad" (or "new"), it means the user assumed something wrong - * and we must exit with a non 0 error code. + * and we must return error with a non 0 error code. * - If one is "good" (or "old"), that's good, we have nothing to do. * - If one is "skipped", we can't know but we should warn. * - If we don't know, we should check it out and ask the user to test. + * - If a merge base must be tested, on success return -11 a special condition + * for early success, this will be converted back to 0 in check_good_are_ancestors_of_bad(). */ -static void check_merge_bases(int rev_nr, struct commit **rev, int no_checkout) +static int check_merge_bases(int rev_nr, struct commit **rev, int no_checkout) { + int res = 0; struct commit_list *result; result = get_merge_bases_many(rev[0], rev_nr - 1, rev + 1); @@ -827,11 +830,16 @@ static void check_merge_bases(int rev_nr, struct commit **rev, int no_checkout) handle_skipped_merge_base(mb); } else { printf(_("Bisecting: a merge base must be tested\n")); - exit(bisect_checkout(mb, no_checkout)); + res = bisect_checkout(mb, no_checkout); + if (!res) + /* indicate early success */ + res = -11; + break; } } free_commit_list(result); + return res; } static int check_ancestors(struct repository *r, int rev_nr, @@ -865,7 +873,7 @@ static void check_good_are_ancestors_of_bad(struct repository *r, { char *filename = git_pathdup("BISECT_ANCESTORS_OK"); struct stat st; - int fd, rev_nr; + int fd, rev_nr, res = 0; struct commit **rev; if (!current_bad_oid) @@ -880,10 +888,13 @@ static void check_good_are_ancestors_of_bad(struct repository *r, goto done; /* Check if all good revs are ancestor of the bad rev. */ + rev = get_bad_and_good_commits(r, &rev_nr); if (check_ancestors(r, rev_nr, rev, prefix)) - check_merge_bases(rev_nr, rev, no_checkout); + 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);
-- 2.21.1 (Apple Git-122.3)