248 lines
10 KiB
Scheme
248 lines
10 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2017 Mathieu Lirzin <mthl@gnu.org>
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;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
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;;; Copyright © 2020 Jakub Kądziołka <kuba@kadziolka.net>
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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 git-download)
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#:use-module (guix gexp)
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#:use-module (guix store)
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#:use-module (guix monads)
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#:use-module (guix records)
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#:use-module (guix packages)
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#:use-module (guix modules)
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#:autoload (guix build-system gnu) (standard-packages)
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#:autoload (git repository) (repository-open
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repository-close!
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repository-discover
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repository-head
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repository-working-directory)
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#:autoload (git commit) (commit-lookup commit-tree)
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#:autoload (git reference) (reference-target)
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#:autoload (git tree) (tree-list)
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#:use-module (ice-9 match)
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#:use-module (ice-9 vlist)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-34)
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#:use-module (srfi srfi-35)
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#:export (git-reference
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git-reference?
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git-reference-url
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git-reference-commit
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git-reference-recursive?
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git-fetch
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git-version
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git-file-name
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git-predicate))
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;;; Commentary:
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;;;
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;;; An <origin> method that fetches a specific commit from a Git repository.
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;;; The repository URL and commit hash are specified with a <git-reference>
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;;; object.
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;;;
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;;; Code:
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(define-record-type* <git-reference>
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git-reference make-git-reference
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git-reference?
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(url git-reference-url)
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(commit git-reference-commit)
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(recursive? git-reference-recursive? ; whether to recurse into sub-modules
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(default #f)))
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(define (git-package)
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"Return the default Git package."
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(let ((distro (resolve-interface '(gnu packages version-control))))
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(module-ref distro 'git-minimal)))
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(define* (git-fetch ref hash-algo hash
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#:optional name
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#:key (system (%current-system)) (guile (default-guile))
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(git (git-package)))
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"Return a fixed-output derivation that fetches REF, a <git-reference>
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object. The output is expected to have recursive hash HASH of type
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HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f."
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(define inputs
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;; When doing 'git clone --recursive', we need sed, grep, etc. to be
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;; available so that 'git submodule' works.
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(if (git-reference-recursive? ref)
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(standard-packages)
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;; The 'swh-download' procedure requires tar and gzip.
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`(("gzip" ,(module-ref (resolve-interface '(gnu packages compression))
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'gzip))
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("tar" ,(module-ref (resolve-interface '(gnu packages base))
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'tar)))))
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(define guile-json
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(module-ref (resolve-interface '(gnu packages guile)) 'guile-json-4))
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(define guile-zlib
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(module-ref (resolve-interface '(gnu packages guile)) 'guile-zlib))
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(define gnutls
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(module-ref (resolve-interface '(gnu packages tls)) 'gnutls))
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(define modules
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(delete '(guix config)
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(source-module-closure '((guix build git)
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(guix build utils)
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(guix build download-nar)
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(guix swh)))))
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(define build
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(with-imported-modules modules
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(with-extensions (list guile-json gnutls ;for (guix swh)
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guile-zlib)
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#~(begin
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(use-modules (guix build git)
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(guix build utils)
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(guix build download-nar)
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(guix swh)
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(ice-9 match))
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(define recursive?
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(call-with-input-string (getenv "git recursive?") read))
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;; The 'git submodule' commands expects Coreutils, sed,
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;; grep, etc. to be in $PATH.
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(set-path-environment-variable "PATH" '("bin")
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(match '#+inputs
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(((names dirs outputs ...) ...)
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dirs)))
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(setvbuf (current-output-port) 'line)
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(setvbuf (current-error-port) 'line)
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(or (git-fetch (getenv "git url") (getenv "git commit")
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#$output
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#:recursive? recursive?
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#:git-command (string-append #+git "/bin/git"))
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(download-nar #$output)
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;; As a last resort, attempt to download from Software Heritage.
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;; Disable X.509 certificate verification to avoid depending
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;; on nss-certs--we're authenticating the checkout anyway.
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;; XXX: Currently recursive checkouts are not supported.
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(and (not recursive?)
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(parameterize ((%verify-swh-certificate? #f))
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(format (current-error-port)
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"Trying to download from Software Heritage...~%")
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(swh-download (getenv "git url") (getenv "git commit")
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#$output))))))))
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(mlet %store-monad ((guile (package->derivation guile system)))
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(gexp->derivation (or name "git-checkout") build
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;; Use environment variables and a fixed script name so
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;; there's only one script in store for all the
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;; downloads.
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#:script-name "git-download"
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#:env-vars
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`(("git url" . ,(git-reference-url ref))
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("git commit" . ,(git-reference-commit ref))
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("git recursive?" . ,(object->string
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(git-reference-recursive? ref))))
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#:leaked-env-vars '("http_proxy" "https_proxy"
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"LC_ALL" "LC_MESSAGES" "LANG"
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"COLUMNS")
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#:system system
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#:local-build? #t ;don't offload repo cloning
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#:hash-algo hash-algo
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#:hash hash
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#:recursive? #t
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#:guile-for-build guile)))
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(define (git-version version revision commit)
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"Return the version string for packages using git-download."
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;; git-version is almost exclusively executed while modules are being loaded.
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;; This makes any errors hide their backtrace. Avoid the mysterious error
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;; "Value out of range 0 to N: 7" when the commit ID is too short, which
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;; can happen, for example, when the user swapped the revision and commit
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;; arguments by mistake.
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(when (< (string-length commit) 7)
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(raise
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(condition
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(&message (message "git-version: commit ID unexpectedly short")))))
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(string-append version "-" revision "." (string-take commit 7)))
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(define (git-file-name name version)
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"Return the file-name for packages using git-download."
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(string-append name "-" version "-checkout"))
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;;;
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;;; 'git-predicate'.
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;;;
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(define (git-file-list directory)
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"Return the list of files checked in in the Git repository at DIRECTORY.
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The result is similar to that of the 'git ls-files' command, except that it
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also includes directories, not just regular files. The returned file names
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are relative to DIRECTORY, which is not necessarily the root of the checkout."
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(let* (;; 'repository-working-directory' always returns a trailing "/",
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;; so add one here to ease the comparisons below.
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(directory (string-append (canonicalize-path directory) "/"))
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(dot-git (repository-discover directory))
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(repository (repository-open dot-git))
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(workdir (repository-working-directory repository))
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(head (repository-head repository))
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(oid (reference-target head))
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(commit (commit-lookup repository oid))
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(tree (commit-tree commit))
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(files (tree-list tree)))
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(repository-close! repository)
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(if (string=? workdir directory)
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files
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(let ((relative (string-drop directory (string-length workdir))))
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(filter-map (lambda (file)
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(and (string-prefix? relative file)
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(string-drop file (string-length relative))))
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files)))))
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(define (git-predicate directory)
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"Return a predicate that returns true if a file is part of the Git checkout
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living at DIRECTORY. If DIRECTORY does not lie within a Git checkout, and
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upon Git errors, return #f instead of a predicate.
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The returned predicate takes two arguments FILE and STAT where FILE is an
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absolute file name and STAT is the result of 'lstat'."
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(catch 'git-error
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(lambda ()
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(let* ((files (git-file-list directory))
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(inodes (fold (lambda (file result)
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(let ((stat
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(lstat (string-append directory "/"
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file))))
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(vhash-consv (stat:ino stat) (stat:dev stat)
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result)))
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vlist-null
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files)))
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(lambda (file stat)
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;; Comparing file names is always tricky business so we rely on inode
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;; numbers instead.
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(match (vhash-assv (stat:ino stat) inodes)
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((_ . dev) (= dev (stat:dev stat)))
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(#f #f)))))
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(const #f)))
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;;; git-download.scm ends here
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