ref: 5cba683055fc3f2a19eb866b12b7d22b4516d5a1
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