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sysupdate: only pull on 'front' branch

prevent accidental merges and clobbers of work in progress

--- a/rc/bin/sysupdate

+++ b/rc/bin/sysupdate

@@ -5,4 +5,7 @@

 cd /

 if(! test -d .git)

 	bind -ac /dist/plan9front /

-git/pull -u gits://git.9front.org/plan9front/plan9front

+if(! ~ `{git/branch} heads/front)

+	>[1=2] echo sysupdate: must be on "front" branch to pull

+if not

+	git/pull -u gits://git.9front.org/plan9front/plan9front