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git tries to stat //HEAD when searching for a repo, leading to huge delays on Cygwin




Hi,

I have a workaround for this, but someone on stack overflow [1] suggested reporting it upstream, so here you go:

I have a fancy shell prompt that executes "git rev-parse --is-inside-work-tree" to determine whether we're currently inside a working directory. This causes git to walk up the directory hierarchy looking for a containing git repo. For example, when invoked from my home directory, it stats the following paths, in order:

/home/me/.git
/home/me/.git/HEAD
/home/me/HEAD
/home
/home/.git
/home/.git/HEAD
/home/HEAD
/
/.git
/.git/HEAD
//HEAD

The last name (//HEAD) interacts badly with Cygwin, which interprets it as a UNC file share, and so demand-loads a bunch of extra DLLs and attempts to resolve/contact the server named HEAD. This obviously doesn't work too well, especially over a slow network link.

I've tested with the latest Cygwin git (2.15.0); this was also present in a prior version.

Cheers,
Andrew

[1] https://stackoverflow.com/questions/47084672