build/go: Use trimpath go flag.

Go 1.13 introduced[1] a new "trimpath" flag in charge of removing the
references to the go toolchain in the produced ELFs. We used to remove
these references using the "remove-go-reference" function. This function
was executed after go install. By using this new trimpath flag, we don't
have to remove any store path from the ELFs produced by go install.

We're not using any go older than 1.13 anymore, it's safe to remove
these functions.

[1] https://go.dev/doc/go1.13

    -trimpath
        remove all file system paths from the resulting executable.
        Instead of absolute file system paths, the recorded file names
        will begin either a module path@version (when using modules),
        or a plain import path (when using the standard library, or
        GOPATH).

* guix/build/go-build-system.scm (build): Add -trimpath
(%standard-phases): Remove remove-go-references.
(remove-go-references): Remove.

Change-Id: Idcae366d226da5ce095693f81fd33133fd1d70d6
Co-authored-by: Picnoir <picnoir@alternativebit.fr>
Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

guix/build/go-build-system.scm

@@ -6,6 +6,8 @@
 ;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
 ;;; Copyright © 2020, 2021, 2023 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
+;;; Copyright © 2024 Ekaitz Zarraga <ekaitz@elenq.tech>
+;;; Copyright © 2024 Picnoir <picnoir@alternativebit.fr>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -90,7 +92,6 @@ (define-module (guix build go-build-system)
 ;; * Use Go modules [4]
 ;; * Re-use compiled packages [5]
 ;; * Avoid the go-inputs hack
-;; * Stop needing remove-go-references (-trimpath ? )
 ;; * Remove module packages, only offering the full Git repos? This is
 ;; more idiomatic, I think, because Go downloads Git repos, not modules.
 ;; What are the trade-offs?
@@ -266,6 +267,7 @@ (define* (build #:key import-path build-flags #:allow-other-keys)
               ;; Respectively, strip the symbol table and debug
               ;; information, and the DWARF symbol table.
               "-ldflags=-s -w"
+              "-trimpath"
               `(,@build-flags ,import-path)))
     (lambda (key . args)
       (display (string-append "Building '" import-path "' failed.\n"
@@ -305,58 +307,6 @@ (define* (install-license-files #:key unpack-path
                                                     unpack-path))
     (apply (assoc-ref gnu:%standard-phases 'install-license-files) args)))
 
-(define* (remove-store-reference file file-name
-                                  #:optional (store (%store-directory)))
-  "Remove from FILE occurrences of FILE-NAME in STORE; return #t when FILE-NAME
-is encountered in FILE, #f otherwise. This implementation reads FILE one byte at
-a time, which is slow. Instead, we should use the Boyer-Moore string search
-algorithm; there is an example in (guix build grafts)."
-  (define pattern
-    (string-take file-name
-                 (+ 34 (string-length (%store-directory)))))
-
-  (with-fluids ((%default-port-encoding #f))
-    (with-atomic-file-replacement file
-      (lambda (in out)
-        ;; We cannot use `regexp-exec' here because it cannot deal with
-        ;; strings containing NUL characters.
-        (format #t "removing references to `~a' from `~a'...~%" file-name file)
-        (setvbuf in 'block 65536)
-        (setvbuf out 'block 65536)
-        (fold-port-matches (lambda (match result)
-                             (put-bytevector out (string->utf8 store))
-                             (put-u8 out (char->integer #\/))
-                             (put-bytevector out
-                                             (string->utf8
-                                              "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-"))
-                             #t)
-                           #f
-                           pattern
-                           in
-                           (lambda (char result)
-                             (put-u8 out (char->integer char))
-                             result))))))
-
-(define* (remove-go-references #:key allow-go-reference?
-                               inputs outputs #:allow-other-keys)
-  "Remove any references to the Go compiler from the compiled Go executable
-files in OUTPUTS."
-;; We remove this spurious reference to save bandwidth when installing Go
-;; executables. It would be better to not embed the reference in the first
-;; place, but I'm not sure how to do that. The subject was discussed at:
-;; <https://lists.gnu.org/archive/html/guix-devel/2017-10/msg00207.html>
-  (if allow-go-reference?
-    #t
-    (let ((go (assoc-ref inputs "go"))
-          (bin "/bin"))
-      (for-each (lambda (output)
-                  (when (file-exists? (string-append (cdr output)
-                                                     bin))
-                    (for-each (lambda (file)
-                                (remove-store-reference file go))
-                              (find-files (string-append (cdr output) bin)))))
-                outputs)
-      #t)))
 
 (define %standard-phases
   (modify-phases gnu:%standard-phases
@@ -368,8 +318,7 @@ (define %standard-phases
     (replace 'build build)
     (replace 'check check)
     (replace 'install install)
-    (replace 'install-license-files install-license-files)
-    (add-after 'install 'remove-go-references remove-go-references)))
+    (replace 'install-license-files install-license-files)))
 
 (define* (go-build #:key inputs (phases %standard-phases)
                       #:allow-other-keys #:rest args)