Steffen,
Git commands generally have a 7 character minimum by default when
abbreviating hashes, even if fewer characters are still (currently)
unique. Per the documentation:
core.abbrev
Set the length object names are abbreviated to. If unspecified,
many commands abbreviate to 7 hexdigits, which may not be enough
for abbreviated object names to stay unique for sufficiently long
time.
You may be able to set core.abbrev to a smaller value to get even
shorter hashes, but the shorter you go the more likely you are to find
once-unique hashes no longer are, as your repository grows over time.
The default isn't just about what's likely to be unique now; it's
about what's likely to stay unique for a period of time.
Hope this helps!
Bryan Turner
On Thu, Jun 30, 2016 at 12:38 PM, Steffen Nurpmeso <steffen@xxxxxxxxxx> wrote:
> Hello, for your possible interest.
>
> For some time (currently with 2.9.0) know see that a single commit
> gives a longer hash than necessary, even though there is no
> ambiguity:
>
> ?0[steffen@wales ]$ git longca|
> awk 'BEGIN{l7=0;l8=0}\
> /^[[:alnum:]]{7} /{++l7;next}\
> /^[[:alnum:]]{8} /{++l8;print}\
> END{print "L7 " l7 " L8 " l8}'
> 786d0c9c [mimepipe.2] send.c:sendpart(): force iconv(3)+ for TEXT part handlers..
> L7 3364 L8 1
>
> So it is only this single commit.. but why?
>
> ?0[steffen@wales ]$ git long1 786d0c9
> 786d0c9c [mimepipe.2] send.c:sendpart(): force iconv(3)+ for TEXT part handlers..
> ?0[steffen@wales ]$ git long1 786d0c
> 786d0c9c [mimepipe.2] send.c:sendpart(): force iconv(3)+ for TEXT part handlers..
> ?0[steffen@wales ]$ git long1 786d0
> 786d0c9c [mimepipe.2] send.c:sendpart(): force iconv(3)+ for TEXT part handlers..
> ?0[steffen@wales ]$ git long1 786d
> 786d0c9c [mimepipe.2] send.c:sendpart(): force iconv(3)+ for TEXT part handlers..
>
> Not really ambiguous:
>
> ?0[steffen@wales ]$ git long|cut -f1 -d' '|grep ^786
> 786d0c9c
> 786f219
>
> Ciao!
>
> --steffen
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