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#Building Go from source

First we'll need a suitable location for our 'GOROOT', the standard convention is to place it in '/sys/lib/go/$objtype-$version':

mkdir -p /sys/lib/go
cd /sys/lib/go
hget https://golang.org/dl/go1.15.5.src.tar.gz | gunzip -c | tar x
mv go amd64-1.15.5

If you don't already have some version of Go installed it's best to grab a bootstrap tarball built by the 9legacy folks:

hget http://www.9legacy.org/download/go/go1.14.1-plan9-amd64-bootstrap.tbz | bunzip2 -c | tar x

If you have an existing install you can use that instead of the 9legacy bootstraps. There may be some hiccups when there are large version distances between a bootstrap and desired build version. It is best to use to the latest bootstrap when possible and some intermediate builds may be required depending on the age of the bootstrap.

Next we'll need to configure both 'GOROOT' and 'GOROOT_BOOTSTRAP':

GOROOT_BOOTSTRAP=/sys/lib/go/go-plan9-amd64-bootstrap
GOROOT=/sys/lib/go/amd64-1.15.5
cd amd64-1.15.5/src
make.rc

This will build the binaries under $GOROOT/bin. You can install these with:

cp $GOROOT/bin/* /$objtype/bin

or bind them with /bin in your profile:

bind -b $GOROOT/bin /bin

Optionally, if you have the memory available on your system, it may be faster to build using a ramfs in '/tmp':

mkdir -p /sys/lib/go/
ramfs
cd /tmp
hget https://golang.org/dl/go1.15.5.src.tar.gz | gunzip -c | tar x
hget http://www.9legacy.org/download/go/go1.14.1-plan9-amd64-bootstrap.tbz | bunzip2 -c | tar x
mv go amd64-1.15.5
GOROOT_BOOTSTRAP=/tmp/go-plan9-amd64-bootstrap
GOROOT_FINAL=/sys/lib/go/amd64-1.15.5
cd amd64-1.15.5/src
make.rc
dircp /tmp/amd64-1.15.5 /sys/lib/go/

You can verify that 'GOROOT' has been set properly using:

$GOROOT_FINAL/bin/go env