harvey

This is Plan 9 for amd64 built with gcc (and soon, I hope, clang).

This file is a quick list of instructions to get you started quickly.


Prerequisites
=============

To build harvey and play with it, you need to have git, golang, qemu, gcc,
binutils and bison installed. On a Debian, Ubuntu or other .deb system,
you should be able to get going with

sudo aptitude install git golang build-essential bison qemu-system


GERRIT
======

We use gerrithub.io for code-review. If you want to submit changes, go to

https://review.gerrithub.io/#/admin/projects/elbing/harvey

and check out the repository from gerrithub rather than github. The clone
command will probably look something like this:

git clone ssh://USERNAME@review.gerrithub.io:29418/elbing/harvey

you'll need to run a few commands inside the top-level directory to get set
up for code-review:

cd harvey
curl -Lo .git/hooks/commit-msg
http://review.gerrithub.io/tools/hooks/commit-msg
chmod u+x .git/hooks/commit-msg
git config remote.origin.push HEAD:refs/for/master

You're now all set, you can build the whole thing just by running

./BUILD all

which should take maybe a minute.

Once building is complete, you can try booting the kernel with qemu

(cd sys/src/9/k10 && sh ../../../../util/QRUN)

Next you should find a bug somewhere in harvey and fix it. In general, the
util/build tool "just works" in any subdirectory, so you can also build just
the stuff you are looking at, too, eg.

cd sys/src/cmd/aux
build aux.json

Let's say you found a bug and the files you needed to change were
sys/src/9/ip/tcp.c and sys/src/9/ip/ipaux.c. To submit this for review, you do

git add sys/src/9/ip/tcp.c
git add sys/src/9/ip/ipaux.c
git diff --staged # to check that the patch still makes sense
git commit -m 'your description of the patch'
git push

Note the lack of qualifiers in the last push command. It is important,
because it needs to be pushed to "origin HEAD:refs/for/master" for review
(and not to master). This will generate a code-review change request, others
will review it, and if it looks good we will merge it to the mainline repo
using gerrithub.io.

If your patch needs further work (you notice something wrong with it yourself,
or someone suggests changes), you can just edit the affected files and then
amend the change list as follows

git add sys/src/9/ip/tcp.c
git commit --amend
git push

More information on using Gerrit can be found on the gerrithub.io website.


Getting go9p to serve your files
================================

The currently recommended way of doing this is to run go9p/ufs as the file
server for harvey. You can get go9p/ufs in the following way

cd util
mkdir go
cd go
export GOPATH=$(pwd)
go get github.com/rminnich/go9p
go get github.com/rminnich/go9p/ufs
go get github.com/rminnich/go9p
go install github.com/rminnich/go9p/ufs
cp bin/ufs ..

After these, you have util/ufs, and you can use

(export HARVEY=$(pwd) && cd sys/src/9/k10 && sh ../../../../util/GO9PRUN)

to boot with ufs serving the harvey directory for your harvey instance. Once
harvey is up, you can telnet onto it with

util/telnet localhost:5555

Where 5555 is forwarded to the harvey instance. This gives you a prompt
without any security. Once you have the prompt, you can mount the harvey
directory as your root like this (10.0.2.2 is what qemu has as the host)

srv tcp!10.0.2.2!5640 k
mount -a /srv/k /


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