workaround failure of get_url on python 2.7.6 hosts

files/resolve-redirect.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+PYTHON_VERSION=$1
+URL=$2
+
+# golang URLs are behind a redirect that requires clients
+# that support TLS SNI which Python 2.7.6 found on
+# most Ubuntu 14.04 installations does not support.
+# get_url will fail if executed against the original URL
+# but will succeed with the final URL
+
+test "$PYTHON_VERSION" "<" "2.7.9" &&
+url=$(curl -s -I "$URL" | sed -n "s/Location: //p") &&
+test -n "$url" &&
+URL="$url"; echo "$URL"

tasks/main.yml

@@ -1,6 +1,10 @@
 ---
+- name: Resolve redirect early for Python < 2.7.9
+  script: files/resolve-redirect.sh {{ ansible_python_version }} {{ go_download_location }}
+  register: go_download_location_adjusted
+
 - name: Download the Go tarball
-  get_url: url={{ go_download_location }}
+  get_url: url={{ go_download_location_adjusted.stdout }}
            dest=/usr/local/src/{{ go_tarball }}
            sha256sum={{ go_tarball_checksum }}
 

vars/main.yml

@@ -1,2 +1,2 @@
 ---
-go_download_location: "https://storage.googleapis.com/golang/{{ go_tarball }}"
+go_download_location: "https://golang.org/dl/{{ go_tarball }}"