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bisect: libify bisect_checkout

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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>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Pranit Bauva 2020-02-17 09:40:35 +01:00 committed by Junio C Hamano
parent ce58b5d8b1
commit e8e3ce6718
1 changed files with 15 additions and 4 deletions
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19
bisect.c
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@ -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,