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build-system/go: Initialize build cache from input packages. 

* guix/build/go-build-system.com (setup-go-environment): Set GOCACHE to
a location within the build directory.  Union "/var/cache/go/build"
input directories to initialize the cache.  Generate "trim.txt" within
the cache, with the current time.

Signed-off-by: Leo Famulari <leo@famulari.name>
This commit is contained in:
Sarah Morgensen 2021-09-19 22:20:49 -07:00 committed by Leo Famulari
parent d0050ea8ad
commit c90f73f816
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1 changed files with 23 additions and 3 deletions
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guix/build/go-build-system.scm
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@ -5,6 +5,7 @@
;;; Copyright © 2020 Jack Hill <jackhill@jackhill.us>
;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
;;; Copyright © 2020, 2021 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
;;;
;;; This file is part of GNU Guix.
;;;
@ -138,9 +139,28 @@ of the package being built and its dependencies, and GOBIN, which determines
where executables (\"commands\") are installed to. This phase is sometimes used
by packages that use (guix build-system gnu) but have a handful of Go
dependencies, so it should be self-contained."
;; The Go cache is required starting in Go 1.12. We don't actually use it but
;; we need it to be a writable directory.
(setenv "GOCACHE" "/tmp/go-cache")
(define (search-input-directories dir)
(filter directory-exists?
(map (match-lambda
((name . directory)
(string-append directory "/" dir)))
inputs)))
;; Seed the Go build cache with the build caches from input packages.
(let ((cache (string-append (getcwd) "/go-build")))
(setenv "GOCACHE" cache)
(union-build cache
(search-input-directories "/var/cache/go/build")
;; Creating all directories isn't that bad, because there are
;; only ever 256 of them.
#:create-all-directories? #t
#:log-port (%make-void-port "w"))
;; Tell Go that the cache was recently trimmed, so it doesn't try to.
(call-with-output-file (string-append cache "/trim.txt")
(lambda (port)
(format port "~a" (current-time)))))
;; Using the current working directory as GOPATH makes it easier for packagers
;; who need to manipulate the unpacked source code.
(setenv "GOPATH" (getcwd))