Re: [PATCH 2/2] prepare_revision_walk: Check for return value in all places

> Stefan Beller <stefanbeller@gmail.com> writes:
> 
>> Even the documentation tells us:
>> 	You should check if it
>> 	returns any error (non-zero return code) and if it does not, you can
>> 	start using get_revision() to do the iteration.
>>
>> In preparation for this commit, I grepped all occurrences of
>> prepare_revision_walk and added error messages, when there were none.
> 
> Thanks.  One niggling thing is that I do not seem to find a way for
> the function to actually return an error without dying in it, but
> these are independently good changes.
> 
>>
>> Signed-off-by: Stefan Beller <stefanbeller@gmail.com>
>> ---
>>  builtin/branch.c | 4 +++-
>>  builtin/commit.c | 3 ++-
>>  remote.c         | 3 ++-
>>  3 files changed, 7 insertions(+), 3 deletions(-)
>>
>> diff --git a/builtin/branch.c b/builtin/branch.c
>> index 0591b22..ced422b 100644
>> --- a/builtin/branch.c
>> +++ b/builtin/branch.c
>> @@ -653,7 +653,9 @@ static int print_ref_list(int kinds, int detached, int verbose, int abbrev, stru
>>  		add_pending_object(&ref_list.revs,
>>  				   (struct object *) filter, "");
>>  		ref_list.revs.limited = 1;
>> -		prepare_revision_walk(&ref_list.revs);
>> +
>> +		if (prepare_revision_walk(&ref_list.revs))
>> +			die(_("revision walk setup failed"));
>>  		if (verbose)
>>  			ref_list.maxwidth = calc_maxwidth(&ref_list);
>>  	}
>> diff --git a/builtin/commit.c b/builtin/commit.c
>> index 7867768..bb84e1d 100644
>> --- a/builtin/commit.c
>> +++ b/builtin/commit.c
>> @@ -1055,7 +1055,8 @@ static const char *find_author_by_nickname(const char *name)
>>  	revs.mailmap = &mailmap;
>>  	read_mailmap(revs.mailmap, NULL);
>>  
>> -	prepare_revision_walk(&revs);
>> +	if (prepare_revision_walk(&revs))
>> +		die("revision walk setup failed");

>>  	commit = get_revision(&revs);
>>  	if (commit) {
>>  		struct pretty_print_context ctx = {0};
>> diff --git a/remote.c b/remote.c
>> index 894db09..112e4d5 100644
>> --- a/remote.c
>> +++ b/remote.c
>> @@ -1893,7 +1893,8 @@ int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
>>  
>>  	init_revisions(&revs, NULL);
>>  	setup_revisions(rev_argc, rev_argv, &revs, NULL);
>> -	prepare_revision_walk(&revs);
>> +	if (prepare_revision_walk(&revs))
>> +		die("revision walk setup failed");
>>  
>>  	/* ... and count the commits on each side. */
>>  	*num_ours = 0;