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build: Add the Go build system.

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* guix/build-system/go.scm,
guix/build/go-build-system.scm: New files.
* Makefile.am (MODULES): Add new files.
* doc/guix.texi (Build Systems): Document the go-build-system.
This commit is contained in:
Leo Famulari 2017-09-19 21:08:42 -04:00
parent b3936f35ae
commit 91525b486c
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2
Makefile.am
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@ -80,6 +80,7 @@ MODULES = \
guix/build-system/dub.scm \
guix/build-system/emacs.scm \
guix/build-system/font.scm \
guix/build-system/go.scm \
guix/build-system/meson.scm \
guix/build-system/minify.scm \
guix/build-system/asdf.scm \
@ -111,6 +112,7 @@ MODULES = \
guix/build/meson-build-system.scm \
guix/build/minify-build-system.scm \
guix/build/font-build-system.scm \
guix/build/go-build-system.scm \
guix/build/asdf-build-system.scm \
guix/build/git.scm \
guix/build/hg.scm \

18
doc/guix.texi
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@ -3576,6 +3576,24 @@ debugging information''), which roughly means that code is compiled with
@code{-O2 -g}, as is the case for Autoconf-based packages by default.
@end defvr
@defvr {Scheme Variable} go-build-system
This variable is exported by @code{(guix build-system go)}. It
implements a build procedure for Go packages using the standard
@url{https://golang.org/cmd/go/#hdr-Compile_packages_and_dependencies,
Go build mechanisms}.
The user is expected to provide a value for the key @code{#:import-path}
and, in some cases, @code{#:unpack-path}. The
@url{https://golang.org/doc/code.html#ImportPaths, import path}
corresponds to the filesystem path expected by the package's build
scripts and any referring packages, and provides a unique way to
refer to a Go package. It is typically based on a combination of the
package source code's remote URI and filesystem hierarchy structure. In
some cases, you will need to unpack the package's source code to a
different directory structure than the one indicated by the import path,
and @code{#:unpack-path} should be used in such cases.
@end defvr
@defvr {Scheme Variable} glib-or-gtk-build-system
This variable is exported by @code{(guix build-system glib-or-gtk)}. It
is intended for use with packages making use of GLib or GTK+.

132
guix/build-system/go.scm Normal file
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@ -0,0 +1,132 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Petter <petter@mykolab.ch>
;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix build-system go)
#:use-module (guix utils)
#:use-module (guix derivations)
#:use-module (guix search-paths)
#:use-module (guix build-system)
#:use-module (guix build-system gnu)
#:use-module (guix packages)
#:use-module (ice-9 match)
#:export (%go-build-system-modules
go-build
go-build-system))
;; Commentary:
;;
;; Standard build procedure for packages using the Go build system. It is
;; implemented as an extension of 'gnu-build-system'.
;;
;; Code:
(define %go-build-system-modules
;; Build-side modules imported and used by default.
`((guix build go-build-system)
,@%gnu-build-system-modules))
(define (default-go)
;; Lazily resolve the binding to avoid a circular dependency.
(let ((go (resolve-interface '(gnu packages golang))))
(module-ref go 'go)))
(define* (lower name
#:key source inputs native-inputs outputs system target
(go (default-go))
#:allow-other-keys
#:rest arguments)
"Return a bag for NAME."
(define private-keywords
'(#:source #:target #:go #:inputs #:native-inputs))
(and (not target) ;XXX: no cross-compilation
(bag
(name name)
(system system)
(host-inputs `(,@(if source
`(("source" ,source))
'())
,@inputs
;; Keep the standard inputs of 'gnu-build-system'.
,@(standard-packages)))
(build-inputs `(("go" ,go)
,@native-inputs))
(outputs outputs)
(build go-build)
(arguments (strip-keyword-arguments private-keywords arguments)))))
(define* (go-build store name inputs
#:key
(phases '(@ (guix build go-build-system)
%standard-phases))
(outputs '("out"))
(search-paths '())
(import-path "")
(unpack-path "")
(tests? #t)
(system (%current-system))
(guile #f)
(imported-modules %go-build-system-modules)
(modules '((guix build go-build-system)
(guix build utils))))
(define builder
`(begin
(use-modules ,@modules)
(go-build #:name ,name
#:source ,(match (assoc-ref inputs "source")
(((? derivation? source))
(derivation->output-path source))
((source)
source)
(source
source))
#:system ,system
#:phases ,phases
#:outputs %outputs
#:search-paths ',(map search-path-specification->sexp
search-paths)
#:import-path ,import-path
#:unpack-path ,unpack-path
#:tests? ,tests?
#:inputs %build-inputs)))
(define guile-for-build
(match guile
((? package?)
(package-derivation store guile system #:graft? #f))
(#f ; the default
(let* ((distro (resolve-interface '(gnu packages commencement)))
(guile (module-ref distro 'guile-final)))
(package-derivation store guile system
#:graft? #f)))))
(build-expression->derivation store name builder
#:inputs inputs
#:system system
#:modules imported-modules
#:outputs outputs
#:guile-for-build guile-for-build))
(define go-build-system
(build-system
(name 'go)
(description
"Build system for Go programs")
(lower lower)))

217
guix/build/go-build-system.scm Normal file
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@ -0,0 +1,217 @@
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Petter <petter@mykolab.ch>
;;; Copyright © 2017 Leo Famulari <leo@famulari.name>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix build go-build-system)
#:use-module ((guix build gnu-build-system) #:prefix gnu:)
#:use-module (guix build utils)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:export (%standard-phases
go-build))
;; Commentary:
;;
;; Build procedures for Go packages. This is the builder-side code.
;;
;; Software written in Go is either a 'package' (i.e. library) or 'command'
;; (i.e. executable). Both types can be built with either the `go build` or `go
;; install` commands. However, `go build` discards the result of the build
;; process for Go libraries, so we use `go install`, which preserves the
;; results. [0]
;; Go software is developed and built within a particular filesystem hierarchy
;; structure called a 'workspace' [1]. This workspace is found by Go
;; via the GOPATH environment variable. Typically, all Go source code
;; and compiled objects are kept in a single workspace, but it is
;; possible for GOPATH to contain a list of directories, and that is
;; what we do in this go-build-system. [2]
;;
;; Go software, whether a package or a command, is uniquely named using
;; an 'import path'. The import path is based on the URL of the
;; software's source. Since most source code is provided over the
;; internet, the import path is typically a combination of the remote
;; URL and the source repository's filesystem structure. For example,
;; the Go port of the common `du` command is hosted on github.com, at
;; <https://github.com/calmh/du>. Thus, the import path is
;; <github.com/calmh/du>. [3]
;;
;; It may be possible to programatically guess a package's import path
;; based on the source URL, but we don't try that in this revision of
;; the go-build-system.
;;
;; Modules of modular Go libraries are named uniquely with their
;; filesystem paths. For example, the supplemental but "standardized"
;; libraries developed by the Go upstream developers are available at
;; <https://golang.org/x/{net,text,crypto, et cetera}>. The Go IPv4
;; library's import path is <golang.org/x/net/ipv4>. The source of
;; such modular libraries must be unpacked at the top-level of the
;; filesystem structure of the library. So the IPv4 library should be
;; unpacked to <golang.org/x/net>. This is handled in the
;; go-build-system with the optional #:unpack-path key.
;;
;; In general, Go software is built using a standardized build mechanism
;; that does not require any build scripts like Makefiles. This means
;; that all modules of modular libraries cannot be built with a single
;; command. Each module must be built individually. This complicates
;; certain cases, and these issues are currently resolved by creating a
;; filesystem union of the required modules of such libraries. I think
;; this could be improved in future revisions of the go-build-system.
;;
;; [0] `go build`:
;; https://golang.org/cmd/go/#hdr-Compile_packages_and_dependencies
;; `go install`:
;; https://golang.org/cmd/go/#hdr-Compile_and_install_packages_and_dependencies
;; [1] Go workspace example, from <https://golang.org/doc/code.html#Workspaces>:
;; bin/
;; hello # command executable
;; outyet # command executable
;; pkg/
;; linux_amd64/
;; github.com/golang/example/
;; stringutil.a # package object
;; src/
;; github.com/golang/example/
;; .git/ # Git repository metadata
;; hello/
;; hello.go # command source
;; outyet/
;; main.go # command source
;; main_test.go # test source
;; stringutil/
;; reverse.go # package source
;; reverse_test.go # test source
;; golang.org/x/image/
;; .git/ # Git repository metadata
;; bmp/
;; reader.go # package source
;; writer.go # package source
;; ... (many more repositories and packages omitted) ...
;;
;; [2] https://golang.org/doc/code.html#GOPATH
;; [3] https://golang.org/doc/code.html#ImportPaths
;;
;; Code:
(define* (unpack #:key source import-path unpack-path #:allow-other-keys)
"Unpack SOURCE in the UNPACK-PATH, or the IMPORT-PATH is the UNPACK-PATH is
unset. When SOURCE is a directory, copy it instead of unpacking."
(if (string-null? import-path)
((display "WARNING: The Go import path is unset.\n")))
(if (string-null? unpack-path)
(set! unpack-path import-path))
(mkdir "src")
(let ((dest (string-append "src/" unpack-path)))
(mkdir-p dest)
(if (file-is-directory? source)
(begin
(copy-recursively source dest #:keep-mtime? #t)
#t)
(if (string-suffix? ".zip" source)
(zero? (system* "unzip" "-d" dest source))
(zero? (system* "tar" "-C" dest "-xvf" source))))))
(define* (install-source #:key outputs #:allow-other-keys)
"Install the source code to the output directory."
(let* ((out (assoc-ref outputs "out"))
(source "src")
(dest (string-append out "/" source)))
(copy-recursively source dest #:keep-mtime? #t)
#t))
(define (go-package? name)
(string-prefix? "go-" name))
(define (go-inputs inputs)
"Return the alist of INPUTS that are Go software."
;; XXX This should not check the file name of the store item. Instead we
;; should pass, from the host side, the list of inputs that are packages using
;; the go-build-system.
(alist-delete "go" ; Exclude the Go compiler
(alist-delete "source" ; Exclude the source code of the package being built
(filter (match-lambda
((label . directory)
(go-package? ((compose package-name->name+version
strip-store-file-name)
directory)))
(_ #f))
inputs))))
(define* (setup-environment #:key inputs outputs #:allow-other-keys)
"Export the variables GOPATH and GOBIN, which are based on INPUTS and OUTPUTS,
respectively."
(let ((out (assoc-ref outputs "out")))
;; GOPATH is where Go looks for the source code of the build's dependencies.
(set-path-environment-variable "GOPATH"
;; XXX Matching "." hints that we could do
;; something simpler here...
(list ".")
(match (go-inputs inputs)
(((_ . dir) ...)
dir)))
;; Add the source code of the package being built to GOPATH.
(if (getenv "GOPATH")
(setenv "GOPATH" (string-append (getcwd) ":" (getenv "GOPATH")))
(setenv "GOPATH" (getcwd)))
;; Where to install compiled executable files ('commands' in Go parlance').
(setenv "GOBIN" out)
#t))
(define* (build #:key import-path #:allow-other-keys)
"Build the package named by IMPORT-PATH."
(or
(zero? (system* "go" "install"
"-v" ; print the name of packages as they are compiled
"-x" ; print each command as it is invoked
import-path))
(begin
(display (string-append "Building '" import-path "' failed.\n"
"Here are the results of `go env`:\n"))
(system* "go" "env")
#f)))
(define* (check #:key tests? import-path #:allow-other-keys)
"Run the tests for the package named by IMPORT-PATH."
(if tests?
(zero? (system* "go" "test" import-path))))
(define* (install #:key outputs #:allow-other-keys)
"Install the compiled libraries. `go install` installs these files to
$GOPATH/pkg, so we have to copy them into the output direcotry manually.
Compiled executable files should have already been installed to the store based
on $GOBIN in the build phase."
(when (file-exists? "pkg")
(copy-recursively "pkg" (string-append (assoc-ref outputs "out") "/pkg")))
#t)
(define %standard-phases
(modify-phases gnu:%standard-phases
(delete 'configure)
(delete 'patch-generated-file-shebangs)
(replace 'unpack unpack)
(add-after 'unpack 'install-source install-source)
(add-before 'build 'setup-environment setup-environment)
(replace 'build build)
(replace 'check check)
(replace 'install install)))
(define* (go-build #:key inputs (phases %standard-phases)
#:allow-other-keys #:rest args)
"Build the given Go package, applying all of PHASES in order."
(apply gnu:gnu-build #:inputs inputs #:phases phases args))