Re: FW: Windows. Git, and Dedupe

From: René Scharfe <rene.scharfe@lsrfire.ath.cx>
Date: Mar 20, 2013, 19:54 UTC
Message-ID: <514A140C.1040901@lsrfire.ath.cx>
In-Reply-To: <614e174a0b4548a1bcdc6c24c2682829@BLUPR03MB019.namprd03.prod.outlook.com>

Am 19.03.2013 22:36, schrieb Josh Rowe:

> Yes, Dedup is in fact a Server-only feature.

Is there an easier way to reproduce the issue than registering and downloading the Windows Server 2012 evaluation version? It's not that hard, admittedly, but still.

Show 6 quoted lines

> The reparse point could be decoded as being a non-symlink reparse
> itemusing; in those cases, treating the file as an "ordinary"
> file would be appropriate.
>
> For example, see the following. The reparse tag value for symlinks
> isIO_REPARSE_TAG_SYMLINK (0xa000000c) and for deduped files is

 > (IO_REPARSE_TAG_DEDUP) 0x80000013.

That's interesting and invalidates my initial checks with mklink, because if I read compat/mingw.c [1] correctly then git handles symlinks on Windows in a special way, but should treat dedup reparse points as normal files already.

Hrm, but probably st_size is set to zero for them. Do the deduped files appear as empty? "git ls-tree -r HEAD" would show them with a hash of e69de29bb2d1d6434b8b29ae775ad8c2e48c5391. If true then how do we get their real content sizes using Win32 API calls?

By the way, what does the command "git version" return for you?

Thanks, René

[1] https://git.kernel.org/cgit/git/git.git/tree/compat/mingw.c#n427

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