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git/clone: allow cloning into an empty directory

--- a/sys/src/cmd/git/clone

+++ b/sys/src/cmd/git/clone

@@ -17,8 +17,8 @@

 if(~ $#branch 1)

 	branchflag=(-b $branch)

-if(test -e $local)

-	die 'repository already exists:' $local

+if(test -e $local && ~ `{ls $local | sed 1q | wc -l} 1)

+	die 'destination already exists:' $local

 fn clone{

 	flag +e

-- 

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