git/branch: preserve checked in permissions on branch update

we need to copy the files, and we should copy them with the
permissions that exist in the repo.

diff --git a/sys/src/cmd/git/branch b/sys/src/cmd/git/branch
index addfec4b6109a3533d383ee4edeb47f66b1dbd12..d3aa77d2bff99601631f235d119ba0c218a1bbdb 100755 (executable)
--- a/sys/src/cmd/git/branch
+++ b/sys/src/cmd/git/branch
@@ -99,7 +99,7 @@ for(m in $cleanpaths){
                rm -rf .git/index9/tracked/$m
        }
        if(~ $b file){
-               cp  $basedir/tree/$m $m
+               cp -x $basedir/tree/$m $m
                walk -eq $m > .git/index9/tracked/$m
        }
 }