QA: improve the system

1. make sure we run as unprivileged user in its home directory

2. share GOPATH and GOCACHE to avoid rebuilding every time

Part of #829

.gitignore

@@ -1,10 +1,10 @@
 /.vscode
-/QA/__pycache__/
 /asn.mmdb
 /badproxy.pem
 /ca-bundle.pem
 /country.mmdb
 /fbmessenger.jsonl
+/hhfm.jsonl
 /jafar
 /jafar.exe
 /miniooni

QA/.gitignore

@@ -0,0 +1,3 @@
+/GOPATH
+/GOCACHE
+/__pycache__

QA/common.py

@@ -25,7 +25,7 @@ def execute_jafar_and_miniooni(ooni_exe, outfile, experiment, tag, args):
             "-main-command",
             "%s -no '%s' %s" % (ooni_exe, outfile, experiment),
             "-main-user",
-            os.environ["SUDO_USER"],
+            "ooniprobe",  # created in cmd/jafar/Dockerfile
             "-tag", tag,
         ]
         + args

QA/pyrun.sh

@@ -1,5 +1,6 @@
 #!/bin/sh
 set -ex
+export GOPATH=/jafar/QA/GOPATH GOCACHE=/jafar/QA/GOCACHE GO111MODULE=on
 go build -v ./cmd/miniooni
 go build -v ./cmd/jafar
 sudo ./QA/$1.py ./miniooni

cmd/jafar/Dockerfile

@@ -1,3 +1,3 @@
 FROM alpine:edge
 RUN apk add go git musl-dev iptables tmux bind-tools curl sudo python3
-ENV GOPATH=/go GO111MODULE=on
+RUN adduser -D ooniprobe