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building-go: update for 1.15, fix paths, rewrite (thanks qwx)

--- a/building-go.md

+++ b/building-go.md

@@ -1,31 +1,36 @@

-Building Go from source on 9front

-=================================

+Building Go from source

+===

-For building go on 9front its best to leverage ramfs for faster build times.

-It also is reccomended to use the 9legacy bootstrap tars if you lack an existing installation.

+If you don't already have some version of Go installed it's best to

+grab a bootstrap tarball built by 9legacy folks:

-First start by downloading and extracting the tar balls:

-

-	ramfs

 	cd /tmp

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

-	hget https://golang.org/dl/go1.14.7.src.tar.gz | gunzip -c | tar x

-Now we will need a place that we want to be our GOROOT, something like /sys/lib/go/amd64-1.14.7 will work.

-Create the destination dir and bind our go source dir in /tmp over it.

+Next, grab the source for the version of Go you want to build:

-	mkdir -p /sys/lib/go/amd64-1.14.7

-	bind -c go /sys/lib/go/amd64-1.14.7

-	# change directories to the new location so GOROOT gets set properly when building

-	cd /sys/lib/go/amd64-1.14.7/src

+	hget https://golang.org/dl/go1.15.2.src.tar.gz | gunzip -c | tar x

+

+With the bootstrap and source ready to build we'll need to create a `GOROOT`.

+The usual location, and the one we'll use here, is `/sys/lib/go/$arch-$version`.

+Create the directory and bind the downloaded Go source directory over it,

+then change into the `src/` directory under the real `GOROOT` so that the

+correct path is picked up during the build:

+

+	mkdir -p /sys/lib/go/amd64-1.15.2

+	bind -c go /sys/lib/go/amd64-1.15.2

+	cd /sys/lib/go/amd64-1.15.2/src

+

+Finally, we can start the build, making sure to set the `GOROOT_BOOTSTRAP`

+environment variable to the path where the bootstrap package is extracted:

+

 	GOROOT_BOOTSTRAP=/tmp/go-plan9-amd64-bootstrap

-	build.rc

+	make.rc

-After building the tree in /tmp needs to be copied in to the right location.

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

-	unmount /sys/lib/amd64-1.14.7

-	dircp /tmp/go /sys/lib/amd64-1.14.7

-	unmount /tmp

-	# You could also bind the binaries in if you choose

-	cp /sys/lib/amd64-1.14.7/bin/* /amd64/bin

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

+or bind them to `/bin` in your profile:

+

+	bind $GOROOT/bin /bin