Re: [PATCH di/fast-import-deltified-tree] Windows: define S_ISUID properly

[Dmitry Ivankov <divanorama@gmail.com>]

Johannes Sixt <j.sixt <at> viscovery.net> writes:

> 
> From: Johannes Sixt <j6t <at> kdbg.org>
> 
> 8fb3ad76 (fast-import: prevent producing bad delta) introduced the first
> use of S_ISUID. Since before this commit the value was irrelevant, we had
> only a dummy definition in mingw.h. But beginning with this commit the
> macro must expand to a reasonable value. Make it so.
> 
> We do not change S_ISGID from the value 0 because it is used in path.c
> (via FORCE_DIR_SET_GID) to set the mode on directories in a manner that
> is not supported on Windows, and 0 is the right value in this case.
> 
> Signed-off-by: Johannes Sixt <j6t <at> kdbg.org>
> ---
>  compat/mingw.h |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/compat/mingw.h b/compat/mingw.h
> index 547568b..e2c89d6 100644
> --- a/compat/mingw.h
> +++ b/compat/mingw.h
> @@ -22,7 +22,7 @@ typedef int socklen_t;
>  #define S_IWOTH 0
>  #define S_IXOTH 0
>  #define S_IRWXO (S_IROTH | S_IWOTH | S_IXOTH)
> -#define S_ISUID 0
> +#define S_ISUID 04000
>  #define S_ISGID 0
>  #define S_ISVTX 0
> 
Ow, it's awkward that the issue was discussed in [1] but slipped and nobody 
noticed, especially me being a patch sender.

If we choose patch from [1] I'd also change a comment to smth like
/* 
 * We abuse the 04000 bit on directories to mean "do not delta".
 * It is a S_ISUID bit on setuid platforms and an unused bit on
 * non-setuid platforms supported in git. In either case git ignores
 * the bit, so it's safe to abuse it locally.
 */

[1] http://thread.gmane.org/gmane.comp.version-control.git/179223/focus=179762