Add u-root and tmpfs to the bootstrap

This ensures that we have u-root and tmpfs for inclusion in
kernels.

Build tools are now placed in $GOHOSTOS_$GOHOSTARCH/bin

Signed-off-by: Ronald G Minnich <rminnich@gmail.com>

bootstrap.sh

@@ -1,10 +1,22 @@
 #!/bin/sh
 
+set -e
+
+export GOBIN=$(pwd)/$(go env GOHOSTOS)_$(go env GOHOSTARCH)/bin
+echo GOBIN is now $GOBIN
+
 echo Building the build tool...
+GO111MODULE=on go get ./util/src/harvey/cmd/...
 
-GOBIN="$(pwd)/util" go get -u harvey-os.org/cmd/ufs
-GO111MODULE=on GOBIN="$(pwd)/util" go get ./util/src/harvey/cmd/...
+echo Fetching u-root and building it...
+GO111MODULE=on go get github.com/u-root/u-root
 
+echo Fetch harvey-os.org commands and build them into $GOBIN
+GO111MODULE=on go get harvey-os.org/cmd/...
+
+echo FIXME -- once we get more architectures, this needs to be done in sys/src/cmds/build.json
+echo Build tmpfs command into amd64 plan 9 bin
+GO111MODULE=on GOOS=plan9 GOARCH=amd64 go build -o amd64/bin/tmpfs harvey-os.org/cmd/tmpfs
 
 # this will make booting a VM easier
 mkdir -p tmp
@@ -15,12 +27,16 @@ export ARCH=amd64
 # You also need to export your C compiler flavor (gcc, clang, gcc-7...)
 export CC=gcc
 # And build:
-./util/build
+$GOBIN/build
 # See \`build -h' for more information on the build tool.
 
 To enable access to files, create a harvey and none user:
 sudo useradd harvey
 sudo useradd none
 
 none is only required for drawterm/cpu access
+
+Also:
+export HARVEY=$(pwd)
+add $GOBIN to your path
 EOF