From: Pranit Bauva <pranit.bauva@xxxxxxxxx>
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 <negetive-value>`. Follow POSIX conventions to return
<negative-value> to indicate error.
Turn `exit()` to `return` calls in `check_good_are_ancestors_of_bad()`.
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 `cmd_bisect_helper()`.
Mentored-by: Christian Couder <chriscool@xxxxxxxxxxxxx>
Mentored by: Johannes Schindelin <Johannes.Schindelin@xxxxxx>
Signed-off-by: Pranit Bauva <pranit.bauva@xxxxxxxxx>
Signed-off-by: Tanushree Tumane <tanushreetumane@xxxxxxxxx>
---
bisect.c | 41 +++++++++++++++++++++++++---------------
builtin/bisect--helper.c | 12 ++++++++++--
2 files changed, 36 insertions(+), 17 deletions(-)
diff --git a/bisect.c b/bisect.c
index 1134854fe2..87db1cc4be 100644
--- a/bisect.c
+++ b/bisect.c
@@ -859,17 +859,24 @@ static int check_ancestors(int rev_nr, struct commit **rev, const char *prefix)
*
* 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(const char *prefix, int no_checkout)
+static int check_good_are_ancestors_of_bad(const char *prefix, int no_checkout)
{
char *filename = git_pathdup("BISECT_ANCESTORS_OK");
struct stat st;
int fd, rev_nr, res = 0;
struct commit **rev;
- if (!current_bad_oid)
- die(_("a %s revision is needed"), term_bad);
+ /*
+ * 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) {
+ res = error(_("a %s revision is needed"), term_bad);
+ goto done;
+ }
/* Check if file BISECT_ANCESTORS_OK exists. */
if (!stat(filename, &st) && S_ISREG(st.st_mode))
@@ -884,18 +891,20 @@ static void check_good_are_ancestors_of_bad(const char *prefix, int no_checkout)
if (check_ancestors(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;
}
/*
@@ -973,7 +982,9 @@ int bisect_next_all(const char *prefix, int no_checkout)
if (read_bisect_refs())
die(_("reading bisect refs failed"));
- check_good_are_ancestors_of_bad(prefix, no_checkout);
+ res = check_good_are_ancestors_of_bad(prefix, no_checkout);
+ if (res)
+ return res;
bisect_rev_setup(&revs, prefix, "%s", "^%s", 1);
revs.limited = 1;
diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index f441ea85ff..ffb5dbe4b3 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -663,7 +663,8 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
switch (cmdmode) {
case NEXT_ALL:
- return bisect_next_all(prefix, no_checkout);
+ res = bisect_next_all(prefix, no_checkout);
+ break;
case WRITE_TERMS:
if (argc != 2)
return error(_("--write-terms requires two arguments"));
@@ -710,5 +711,12 @@ 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;
}
--
gitgitgadget
