devtools: add go docker container

A docker container is added for running Go code.

Change-Id: I1349d28a9fc54f770dda01dcaa6c314674b1e5aa
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/335249
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

2 files changed, 45 insertions, 0 deletions

diff --git a/devtools/docker/compose.yaml b/devtools/docker/compose.yaml
index 59f64eac..7b50b556 100644
--- a/devtools/docker/compose.yaml
+++ b/devtools/docker/compose.yaml
@@ -133,5 +133,16 @@ services:
       - 3000:3000
     environment:
       - CONNECTION_TIMEOUT=120000
+  go:
+     # This should match the version we are using on AppEngine.
+    image: golang:1.15.5
+    entrypoint: go
+    environment:
+      <<: *database-variables
+      <<: *go-variables
+    volumes:
+      - ../../:/pkgsite
+      - gomodcache:/gomodcache
+    working_dir: /pkgsite
 volumes:
   gomodcache:
diff --git a/devtools/go.sh b/devtools/go.sh
new file mode 100755
index 00000000..d5285a08
--- /dev/null
+++ b/devtools/go.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+# Copyright 2021 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+source devtools/docker.sh || { echo "Are you at repo root?"; exit 1; }
+
+set -e
+
+# Script for running a Go docker image, when go1.15+ is not available locally.
+#
+# This is can used when Go is not installed on a machine (such as in CI by
+# kokoro, which is on go version go1.12 linux/amd64).
+#c
+# It mounts the pwd into a volume in the container at /pkgsite,
+# and sets the working directory in the container to /pkgsite.
+
+gocmd="dockercompose run go"
+if type go > /dev/null; then
+  # pkgsite requires go1.15 or higher. If that's installed on the machine, just
+  # use the local go since it will be faster.
+  # kokoro run go1.12.
+  #
+  # This awk program splits the third whitespace-separated field
+  # (e.g. "go1.15.5") on the dot character and prints the second part.
+  v=`go version | awk '{split($3, parts, /\./); print parts[2]}'`
+  if (( v >= 15 )); then
+    gocmd=go
+  fi;
+fi;
+
+$gocmd $@
+