Some github projects aren't fetchable using commit hash

[Tobias Kortkamp]

On Fri, Sep 1, 2017, at 18:24, Yuri wrote:
> FYI:
> 
> 
> Some github URLs that ports framework uses to fetch by hash fail with no 
> apparent reason. Here are two examples:
> 
> 
> https://codeload.github.com/grame-cncm/guidolib/tar.gz/2ec126d
> 
> https://codeload.github.com/libretro/picodrive/tar.gz/40cd7bc
> 
> 
> I've contacted GitHub, they acknowledged the problem, but offered no 
> solution besides of "we are working on this". Below is my communication 
> with GitHub support.

In libretro/picodrive there are two objects which have the same
abbreviated hash.  Probably best to use the full hash.

$ git cat-file -p 40cd7bc
error: short SHA1 40cd7bc is ambiguous
hint: The candidates are:
hint:   40cd7bc4 commit 2017-08-18 - Add this to pico.h
hint:   40cd7bc9 blob
fatal: Not a valid object name 40cd7bc

> 
> Yuri
> 
> 
> ---
> 
> 
> Hi Yuri,
> 
> Thanks for reaching out about this, and sorry for delayed response!
> 
> We've taken a look at the trouble you're experiencing, and suspect that 
> this might be a bug, so we've opened an internal issue for our engineers 
> to investigate further.
> 
> While we don't yet have a specific ETA on a fix, we'll be sure to update 
> you as soon as there's any news to share.
> 
> Also, thank you for the wonderful detail in your email! It helped 
> enormously with our initial investigations.
> 
> Warm regards,
> 
> Friday
> 
>     Looking at two projects: one tarball fetch succeeds, the other one
>     fails.
> 
>     Fetching the tarball of https://github.com/libretro/emux using
>     https://codeload.github.com/libretro/emux/tar.gz/df14439 - succeeds.
> 
>     Fetching the tarball of https://github.com/libretro/picodrive using
>     https://codeload.github.com/libretro/picodrive/tar.gz/40cd7bc -
>     fails.
> 
>     Both URLs are built from {account}/{project}/{hash} combination in
>     the same way. Both should succeed.
>     This is also how FreeBSD ports download tarballs.
> 
>     Failure log:
> 
>     |# wget https://codeload.github.com/libretro/picodrive/tar.gz/40cd7bc
>     --2017-08-28 21:18:35--
>     https://codeload.github.com/libretro/picodrive/tar.gz/40cd7bc
>     Resolving codeload.github.com (codeload.github.com)...
>     192.30.255.121, 192.30.255.120 Connecting to codeload.github.com
>     (codeload.github.com)|192.30.255.121|:443... connected. HTTP request
>     sent, awaiting response... 404 Not Found 2017-08-28 21:18:35 ERROR
>     404: Not Found. |
> 
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