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sysupdate: namespace side effects, show what files are getting updated

--- a/rc/bin/sysupdate

+++ b/rc/bin/sysupdate

@@ -1,5 +1,6 @@

 #!/bin/rc

-

-bind -ac /dist/plan9front /

-hg incoming

-hg pull && hg update

+rfork n

+cd /

+if(! test -d .hg)

+	bind -ac /dist/plan9front /

+hg incoming && hg pull && hg -v update