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Fix #747 #748

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Fix #747 #748

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@ghost ghost commented Oct 10, 2017

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GitServiceExecutor: Avoid deadlocks between standard input and output…
ba2fa64 
… of the external process

Since GitServiceExecutor.ExecuteServiceByName() writes data synchronously to the externel proccess's standard input, the external process may block on writing output if its output buffer fills. This causes a deadlock when a client uses 'git fetch' to fetch a large number of refs. This issue also leads to git-upload-pack.exe processes running on the server indefinitely. This patch mitigates this issue with two changes:

1) Set RedirectStandardError to false. Since we never read the standard error, redirecting it can cause a deadlock either when writing to the input or when waiting for the process.
2) Start reading the external process's standard output with CopyToAsnyc before we start writing. This ensures that the underlying operating system buffer never fills.

Fixes #747
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