bisect: libify `check_merge_bases` and its dependents
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
BISECT_INTERNAL_SUCCESS_MERGE_BASE (-11) which indicates early
success. This BISECT_INTERNAL_SUCCESS_MERGE_BASE is converted back
to BISECT_OK (0) in `check_good_are_ancestors_of_bad()`.
Update all callers to handle the error returns.
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>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/bisect.c b/bisect.c
index f6582dd..382e0b4 100644
--- a/bisect.c
+++ b/bisect.c
@@ -811,13 +811,18 @@ 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
+ * BISECT_INTERNAL_SUCCESS_MERGE_BASE (-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 enum bisect_error check_merge_bases(int rev_nr, struct commit **rev, int no_checkout)
{
+ enum bisect_error res = BISECT_OK;
struct commit_list *result;
result = get_merge_bases_many(rev[0], rev_nr - 1, rev + 1);
@@ -832,11 +837,16 @@ 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 = BISECT_INTERNAL_SUCCESS_MERGE_BASE;
+ break;
}
}
free_commit_list(result);
+ return res;
}
static int check_ancestors(struct repository *r, int rev_nr,
@@ -871,6 +881,7 @@ 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;
+ enum bisect_error res = BISECT_OK;
struct commit **rev;
if (!current_bad_oid)
@@ -885,10 +896,13 @@ 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 == BISECT_INTERNAL_SUCCESS_MERGE_BASE ? BISECT_OK : -res);
/* Create file BISECT_ANCESTORS_OK. */
fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600);
