Re: new platform & S_IFGITLINK problem

> Alan Hourihane <alanh@fairlite.co.uk> writes:
> 
> > Just joined as I'm compiling git on a new platform and wondered if
> > someone can help solve a problem with the definition of S_IFGITLINK.
> 
> Yikes.  The current codebase pretty much assumes that IFREG is 0100000,
> IFDIR 0040000, and IFLNK 0120000, and the bits read from "struct stat" and
> the mode bits we store in the index and tree objects are interchangeable.
> 
> Yes, that assumption is a gross POSIX violation but we so far haven't seen
> any platform that matters in real life that assigns the IFMT bits
> differently.
> 
> We would need to:
> 
>  (1) rename S_IFGITLINK to GIT_S_IFMODULE;
> 
>  (2) define GIT_S_IF{REG,DIR,LNK} as 0100000, 0040000, and 0120000;
> 
>  (3) write MODE_SYSTEM_TO_GIT() macro to convert from S_IF{REG,DIR,LNK} we
>      read from struct stat to the "canonical" GIT_S_IF{REG,DIR,LNK}
>      values; and
> 
>  (4) change all the code that read mode from struct stat and use it to
>      first use MODE_SYSTEM_TO_GIT().
> 
> Currently 'git grep -e "S_IF[A-Z]" -e "struct stat"' reports around 250
> hits, so it is not infeasible amount of work, but it is not a trivial and
> mechanical replacement, either.  I or somebody need to set aside a block
> of time to do this clean-up and audit the result.
> 
> Thanks for a report.