Hi Junio,
On 05/27/2014 08:42 PM, Junio C Hamano wrote:
> Fabian Ruch <bafain@xxxxxxxxx> writes:
>> [..]
>>
>> In order to signal the three possible situations (not only success and
>> failure to complete) after a pick through porcelain commands such as
>> `cherry-pick`, exit with a return value that is neither 0 nor 1. -1 was
>> chosen in line with the other situations in which the sequencer
>> encounters an error.
>
> Hmph... do we still pass negative to exit() anywhere in our codebase?
No, but I thought `cmd_cherry_pick` would just forward the `return -1` from the
sequencer to the shell. I had another look and found that `cmd_cherry_pick`
calls `die` instead. Now, the commit inserts 128 as exit status in
`fast_forward_to`.
Would it be appropriate to mention the choice of exit status in the coding
guidelines? I didn't know that the int-argument to exit(3) gets truncated and
that this is why it is a general rule to only use values in the range from 0 to
255 with exit(3).
Kind regards,
Fabian
-- >8 --
Subject: sequencer: Signal failed ff as an aborted, not a conflicted merge
`do_pick_commit` handles three situations if it is not fast-forwarding.
In order for `do_pick_commit` to identify the situation, it examines the
return value of the selected merge command.
1. return value 0 stands for a clean merge
2. 1 is passed in case of a failed merge due to conflict
3. any other return value means that the merge did not even start
So far, the sequencer returns 1 in case of a failed fast-forward, which
would mean "failed merge due to conflict". However, a fast-forward
either starts and succeeds or does not start at all. In particular, it
cannot fail in between like a merge with a dirty index due to conflicts.
In order to signal the three possible situations (not only success and
failure to complete) after a pick through porcelain commands such as
`cherry-pick`, exit with a return value that is neither 0 nor 1. 128 was
chosen in line with the other situations in which the sequencer
encounters an error. In such situations, the sequencer returns a
negative value and `cherry-pick` translates this into a call to `die`.
`die` then terminates the process with exit status 128.
Signed-off-by: Fabian Ruch <bafain@xxxxxxxxx>
---
sequencer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sequencer.c b/sequencer.c
index 90cac7b..225afcb 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -278,7 +278,7 @@ static int fast_forward_to(const unsigned char *to, const unsigned char *from,
read_cache();
if (checkout_fast_forward(from, to, 1))
- exit(1); /* the callee should have complained already */
+ exit(128); /* the callee should have complained already */
ref_lock = lock_any_ref_for_update("HEAD", unborn ? null_sha1 : from,
0, NULL);
strbuf_addf(&sb, "%s: fast-forward", action_name(opts));
--
2.0.0
--
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