[bug#39570] [PATCH] gnu: go: update to 1.13.2

[Jack Hill <jackhill@jackhill.us>]

* gnu/packages/golang.scm (go-1.12): Rename to go-1.13, [version]: Update to
  1.13.7
  (go): Update to go-1.13
* guix/build/go-build-system.scm (setup-go-environment): Set GO111MODULE to
  off.
---
 gnu/packages/golang.scm        | 9 ++++-----
 guix/build/go-build-system.scm | 4 ++++
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/gnu/packages/golang.scm b/gnu/packages/golang.scm
index 9102469749..798600f680 100644
--- a/gnu/packages/golang.scm
+++ b/gnu/packages/golang.scm
@@ -216,11 +216,11 @@ in the style of communicating sequential processes (@dfn{CSP}).")
     (supported-systems '("x86_64-linux" "i686-linux" "armhf-linux" "aarch64-linux"))
     (license license:bsd-3)))
 
-(define-public go-1.12
+(define-public go-1.13
   (package
     (inherit go-1.4)
     (name "go")
-    (version "1.12.16")
+    (version "1.13.7")
     (source
      (origin
        (method url-fetch)
@@ -228,7 +228,7 @@ in the style of communicating sequential processes (@dfn{CSP}).")
                            name version ".src.tar.gz"))
        (sha256
         (base32
-         "1y0x10fsvgpc1x24b9q9y6kv9b0kwf7879am3p0gym2abgc5wvnf"))))
+         "1x21kfpzfkvmqd42pan6nl862m7jjl4niqxxpcgm46awbz645bg4"))))
     (arguments
      (substitute-keyword-arguments (package-arguments go-1.4)
        ((#:phases phases)
@@ -367,7 +367,6 @@ in the style of communicating sequential processes (@dfn{CSP}).")
                       (docs (string-append doc_out "/share/doc/" ,name "-" ,version))
                       (src (string-append
                             (assoc-ref outputs "tests") "/share/" ,name "-" ,version)))
-                 (delete-file-recursively "../pkg/bootstrap")
                  ;; Prevent installation of the build cache, which contains
                  ;; store references to most of the tools used to build Go and
                  ;; would unnecessarily increase the size of Go's closure if it
@@ -405,7 +404,7 @@ in the style of communicating sequential processes (@dfn{CSP}).")
        ,@(package-native-inputs go-1.4)))
     (supported-systems %supported-systems)))
 
-(define-public go go-1.12)
+(define-public go go-1.13)
 
 (define-public go-github-com-alsm-ioprogress
   (let ((commit "063c3725f436e7fba0c8f588547bee21ffec7ac5")
diff --git a/guix/build/go-build-system.scm b/guix/build/go-build-system.scm
index 4bc0156a88..3337552d96 100644
--- a/guix/build/go-build-system.scm
+++ b/guix/build/go-build-system.scm
@@ -141,6 +141,10 @@ dependencies, so it should be self-contained."
   ;; Using the current working directory as GOPATH makes it easier for packagers
   ;; who need to manipulate the unpacked source code.
   (setenv "GOPATH" (getcwd))
+  ;; Go 1.13 uses go modules by default. The go build system does not
+  ;; currently support modules, so turn modules off to continue using the old
+  ;; GOPATH behavior.
+  (setenv "GO111MODULE" "off")
   (setenv "GOBIN" (string-append (assoc-ref outputs "out") "/bin"))
   (let ((tmpdir (tmpnam)))
     (match (go-inputs inputs)
-- 
2.25.0