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