build: upgrade from Go 1.15.5 -> 1.15.6

Also updated scripts/update_golang_version.sh to handle new CircleCI
file layout.

.circleci/config.yml

@@ -430,7 +430,7 @@ executors:
   go:
     working_directory: /go/src/github.com/hashicorp/nomad
     docker:
-      - image: docker.mirror.hashicorp.services/golang:1.15.5
+      - image: docker.mirror.hashicorp.services/golang:1.15.6
     environment:
       <<: *common_envs
       GOPATH: /go
@@ -442,7 +442,7 @@ executors:
     environment: &machine_env
       <<: *common_envs
       GOPATH: /home/circleci/go
-      GOLANG_VERSION: 1.15.5
+      GOLANG_VERSION: 1.15.6
 
   # uses a more recent image with unattended upgrades disabled properly
   # but seems to break docker builds
@@ -459,7 +459,7 @@ executors:
     environment:
       <<: *common_envs
       GOPATH: /Users/distiller/go
-      GOLANG_VERSION: 1.15.5
+      GOLANG_VERSION: 1.15.6
 
   go-windows:
     machine:
@@ -471,7 +471,7 @@ executors:
       GOPATH: c:\gopath
       GOBIN: c:\gopath\bin
       GOTESTSUM_PATH: c:\tmp\test-reports
-      GOLANG_VERSION: 1.15.5
+      GOLANG_VERSION: 1.15.6
       GOTESTSUM_VERSION: 0.4.2
       VAULT_VERSION: 1.4.1
 

CHANGELOG.md

 ## 1.0.2 (Unreleased)
 
 IMPROVEMENTS:
+ * build: Updated to Go 1.15.6. [[GH-9686](https://github.com/hashicorp/nomad/issues/9686)]
  * consul/connect: interpolate the connect, service meta, and service canary meta blocks with the task environment [[GH-9586](https://github.com/hashicorp/nomad/pull/9586)]
 
 BUG FIXES:

contributing/README.md

@@ -30,7 +30,7 @@ A development environment is supplied via Vagrant to make getting started easier
 
 Developing without Vagrant
 ---
-1. Install [Go 1.15.5+](https://golang.org/) *(Note: `gcc-go` is not supported)*
+1. Install [Go 1.15.6+](https://golang.org/) *(Note: `gcc-go` is not supported)*
 1. Clone this repo
    ```sh
    $ git clone https://github.com/hashicorp/nomad.git

contributing/golang.md

@@ -12,6 +12,7 @@ version.
 
 | Nomad Version | Go Version |
 |:-------------:|:----------:|
+| 1.0.2         | 1.15.6     |
 | 1.0           | 1.15.5     |
 | 0.12.2        | 1.14.7     |
 | 0.12.1        | 1.14.6     |

scripts/release/mac-remote-build

@@ -56,7 +56,7 @@ REPO_PATH="${TMP_WORKSPACE}/gopath/src/github.com/hashicorp/nomad"
 mkdir -p "${TMP_WORKSPACE}/tmp"
 
 install_go() {
-  local go_version="1.15.5"
+  local go_version="1.15.6"
   local download=
 
   download="https://storage.googleapis.com/golang/go${go_version}.darwin-amd64.tar.gz"

scripts/update_golang_version.sh

@@ -9,16 +9,19 @@ fi
 
 golang_version="$1"
 
-current_version=$(grep -o -e 'golang:[.0-9]*' .circleci/config.yml | head -n1 | cut -d: -f2)
+current_version=$(grep -o -E -e '/golang:[.0-9]+' .circleci/config.yml | head -n1 | cut -d: -f2)
+if [ -z "${current_version}" ]; then
+    echo "unable to find current go version"
+    exit 1
+fi
 echo "--> Replacing Go ${current_version} with Go ${golang_version} ..."
 
 # To support both GNU and BSD sed, the regex is looser than it needs to be.
 # Specifically, we use "* instead of "?, which relies on GNU extension without much loss of
 # correctness in practice.
-sed -i'' -e "s|golang:[.0-9]*|golang:${golang_version}|g" \
-       	.circleci/config/config.yml .circleci/config.yml
+sed -i'' -e "s|/golang:[.0-9]*|/golang:${golang_version}|g" .circleci/config.yml
 sed -i'' -e "s|GOLANG_VERSION:[ \"]*[.0-9]*\"*|GOLANG_VERSION: ${golang_version}|g" \
-	.circleci/config/config.yml .circleci/config.yml
+	.circleci/config.yml
 
 sed -i'' -e "s|\\(golang.org.*version\\) [.0-9]*|\\1 ${golang_version}|g" \
 	README.md

scripts/vagrant-linux-priv-go.sh

@@ -3,7 +3,7 @@
 set -o errexit
 
 function install_go() {
-	local go_version="1.15.5"
+	local go_version="1.15.6"
 	local download="https://storage.googleapis.com/golang/go${go_version}.linux-amd64.tar.gz"
 
 		if go version 2>&1 | grep -q "${go_version}"; then