[PATCH] alpm: return -1 for error in find_dl_candidates

[Morgan Adamiec]

On 05/10/2021 18:10, Andrew Gregory wrote:
> On 10/05/21 at 12:53pm, Morgan Adamiec wrote:
>>    On 4 Oct 2021 8:28 pm, Andrew Gregory <andrew.gregory.8 at gmail.com> wrote:    
>>                                                                                 
>>      On 10/04/21 at 08:09pm, morganamilo wrote:                                 
>>      > This is the error value generally used and the calling function          
>>      > explicitly checks for -1, later causing the error to be missed           
>>      > and the transaction to continue.                                         
>>                                                                                 
>>      This result is not compared to -1, the result of download_files is.  If    
>>      we want                                                                    
>>      to guarantee that download_files will return -1 on error, that's where     
>>      the                                                                        
>>      return should be normalized, not in find_dl_candidates.  Tying the API     
>>      of one                                                                     
>>      function to another like this is just going to cause confusion and         
>>      breakage                                                                   
>>      when somebody forgets in the future.  Really, the caller of                
>>      download_files                                                             
>>      should just check for a successful return; we return 1 as an error from    
>>      lots of                                                                    
>>      functions.                                                                 
>>                                                                                 
>>    I'll change that too. This should still be accepted though.                  
> 
> Why?  If your reasoning is just that -1 is a better error value, we use 1 in
> lots of other places like I said and I don't want to change that one at a time.
> 
> $ grep 'return 1;' lib/libalpm/*.c src/*/*.c | wc -l                                                                                                                                                                                [0][1016]
> 132
> 

Everywhere in the function returns -1. Lets at least be consistent for
the same function.