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setup: split off a function to checks working dir for .git file
The repository discovery procedure looks something like this: while (same filesystem) { check .git in working dir check . chdir(..) } Add a function for the first step to make the actual code look a bit closer to that pseudocode. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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