ref: c28f07b5840216c4e83e1d3b21d8a9ed7c41f8f9
dir: /rc/bin/sysupdate/
#!/bin/rc -b rfork en cd / if(! test -d .git) bind -ac /dist/plan9front / if(! ~ `{git/branch} heads/front) >[1=2] echo sysupdate: must be on "front" to pull if not git/pull -u gits://git.9front.org/plan9front/plan9front